125876 + Interview Questions in General QA

1.	Improvement of human race by encouraging the healthy persons to marry early and produce large number of children is called _________ (a) Positive eugenics(b) Negative eugenics (c) Positive euthenics (d) Positive euphenics
Answer» (a) Positive eugenics

Discussion

2.	ABO blood group in man is controlled by ____________ (a) Multiple alleles (b) Lethal genes (c) Sex linked genes (d) Y-linked genes
Answer» (a) Multiple alleles

Discussion

3.	A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other off springs.
Answer» The parents of the child will be heterozygous for their blood groups. Therefore, his father with blood group A must-have genotype (I^A I^o) and mother with blood group B must have genotype (I^B I^o).

Discussion

4.

Some genetic abnormalities, their genotypes and features are distributed in columns A, B and C respectively. Match them correctly.Column AColumn BColumn CDown's syndrome44A+xoRudimentary ovary and sterilityTurner's syndrome44A+xxyFurrowed tongue and partially opened mouthKlinefelter's syndrome45A+xx/xyGynaecomastia and sterility

Answer»

Column A	Column B	Column C
Down's syndrome	45A+xx/xy	Furrowed tongue and partially opened mouth
Turner's syndrome	44A+xo	Rudimentary ovary and sterility
Klinefelter's syndrome	44A+xxy	Gynaecomastia and sterility

Discussion

5.	Which of the following is not correct? (a) Three or more alleles of a trait in the population are called multiple alleles. (b) A normal gene undergoes mutations to form many alleles (c) Multiple alleles map at different loci of a chromosome (d) A diploid organism has only two alleles out of many in the population
Answer» (c) Multiple alleles map at different loci of a chromosome

Discussion

6.	Major earthquakes are less likely to occur in(a) North East India(b) Rajasthan(c) crust(d) inner core
Answer» Major earthquakes are less likely to occur in (c) crust.

Discussion

7.	An inflated rubber balloon and a woollen cloth are rubbed together. What type of charge is acquired by (a) woollen cloth, and (b) rubber balloon?
Answer» The rubber balloon becomes negatively charged when rubbed with a woolen cloth. The woolen cloth acquires a positive charge.

Discussion

8.	Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father-AB group2. Mother-O group3. Daughter – A group4. Son B-group
Answer» 1. Father – i^A i^B 2. Mother – i i 3. Son-i^B i 4. daughter i^A i

8.

Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father-AB group2. Mother-O group3. Daughter – A group4. Son B-group

Answer»

1. Father – i^A i^B

2. Mother – i i

3. Son-i^B i

4. daughter i^A i

Discussion

9.	A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth. Now, out of glass rod, silk cloth, rubber balloon and woollen cloth: (a) which two objects acquire negative charge? (b) which two objects acquire positive charge?
Answer» (a) Silk cloth and Rubber balloon acquire negative charge. When a glass rod is rubbed with silk, some of the electrons from the glass atoms are transferred to silk. Due to the deficiency of electrons in the glass atoms, it becomes positively charged. Whereas the silk has acquired electrons, it becomes negatively charged. An inflated rubber balloon can be charged by rubbing it against the woolen cloth. Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The rubbed part of the balloon now has a negative charge. (b) Glass rod and Woolen cloth acquire positive charge. When a glass rod is rubbed with silk, some of the electrons from the glass atoms are transferred to silk. Due to the deficiency of electrons in the glass atoms, it becomes positively charged. An inflated rubber balloon can be charged by rubbing it against the woolen cloth. Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The woolen cloth is left with a positive charge.

9.

A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth. Now, out of glass rod, silk cloth, rubber balloon and woollen cloth: (a) which two objects acquire negative charge? (b) which two objects acquire positive charge?

Answer»

(a) Silk cloth and Rubber balloon acquire negative charge. When a glass rod is rubbed with silk, some of the electrons from the glass atoms are transferred to silk. Due to the deficiency of electrons in the glass atoms, it becomes positively charged. Whereas the silk has acquired electrons, it becomes negatively charged. An inflated rubber balloon can be charged by rubbing it against the woolen cloth. Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The rubbed part of the balloon now has a negative charge.

(b) Glass rod and Woolen cloth acquire positive charge. When a glass rod is rubbed with silk, some of the electrons from the glass atoms are transferred to silk. Due to the deficiency of electrons in the glass atoms, it becomes positively charged. An inflated rubber balloon can be charged by rubbing it against the woolen cloth. Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The woolen cloth is left with a positive charge.

Discussion

10.	An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged? A) Inflated rubber balloon B) Woollen cloth C) Ballpoint pen refill D) Polythene bag A. A and B B. B and C C. A and D D. B and D
Answer» B. B and C A ballpoint pen refill can be charged by rubbing it against the wool cloth. It becomes negatively charged.

10.

An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged? A) Inflated rubber balloon B) Woollen cloth C) Ballpoint pen refill D) Polythene bag A. A and B B. B and C C. A and D D. B and D

Answer»

B. B and C

A ballpoint pen refill can be charged by rubbing it against the wool cloth. It becomes negatively charged.

Discussion

11.	Which of the following cannot be charged easily by friction? (a). A plastic scale (b). A copper rod (c). An inflated balloon (d). A woollen cloth
Answer» (a). A plastic scale

Discussion

12.	List three states in India where earthquakes are more likely to strike.
Answer» The three states in India where earthquakes are more likely to strike are Jammu and Kashmir,Gujarat, and Assam.

Discussion

13.	Three children of a family have blood groups A, AB and B. What could be the geno types of their parents? (a) IA IB and ii (b) IA 1O and IB IO (c) IB IB and IA IA (d) IA IA and ii
Answer» (b) I^A 1^O and I^B I^O

Discussion

14.	Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father – AB group2. Mother – O group3. Daughter – A group4. Son B – group
Answer» 1. Father- I^A I^B , 2. Mother- i i, 3. Son – I^B i, 4. daughter - I^A i

14.

Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father – AB group2. Mother – O group3. Daughter – A group4. Son B – group

Answer»

1. Father- I^A I^B ,

2. Mother- i i,

3. Son – I^B i,

4. daughter - I^A i

Discussion

15.	What damage can be done when lightning strikes on the earth?
Answer» Lightening can result in electric shocks, damage to the buildings and fire. The electric discharge from the clouds can travel through the metal objects and can result into the electric discharge to the person carrying it.

Discussion

16.	Name two events (other than earthquakes) which can cause tremors on the earth.
Answer» The tremors on the earth can be caused when a volcano erupts or when a meteor hits the earth. It can also be caused by an underground nuclear explosion.

Discussion

17.	How will you charge a plastic comb (plastic scale or plastic pen) by the method of friction?
Answer» The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object. A plastic comb can be charged by rubbing. The plastic comb will carry a negative charge.

Discussion

18.	Major earthquakes are less likely to occur in(a) North East India(b) Rajasthan(c) Rann of Kutch(d) Orissa
Answer» Major earthquakes are less likely to occur in (d) Orissa.

Discussion

19.	How will you charge an inflated rubber balloon by the method of friction?
Answer» An inflated balloon can be charged by rubbing it against the woolen cloth. Explanation: Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The rubbed part of the balloon now has a negative charge.

19.

How will you charge an inflated rubber balloon by the method of friction?

Answer»

An inflated balloon can be charged by rubbing it against the woolen cloth.

Explanation: Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon’s surface. The rubbed part of the balloon now has a negative charge.

Discussion

20.	Where is the upper end of the lightning conductor fixed in a building?
Answer» A metallic rod which is taller than the building is installed in the walls of the building during its construction. One end of the rod is kept out in the air and the other end is buried deep in the ground. The rod provides easy route for the transfer of electric charge to the ground.

Discussion

21.	Explain how lightning would be formed?
Answer» The clouds moving in air acquire a charge on their surface due to the friction with particles of air. As the surface area of a cloud is very large, the amount of charge accumulated on its surface is very high. When a charged cloud comes close to another cloud is induces an opposite charge on the later and the accumulated charge tries to move from one cloud to another cloud. But the air present between them bring a poor conductors of electricity resists the flow of charge between them. When the magnitude of the accumulated charges become very large, the air which is normally a poor conductor of electricity, is no longer to able to resist their flow. Hence discharge takes place between negative and positive charges which produce streaks of bright light and sound. We see streaks as lightning.

21.

Explain how lightning would be formed?

Answer»

The clouds moving in air acquire a charge on their surface due to the friction with particles of air. As the surface area of a cloud is very large, the amount of charge accumulated on its surface is very high.

When a charged cloud comes close to another cloud is induces an opposite charge on the later and the accumulated charge tries to move from one cloud to another cloud.

But the air present between them bring a poor conductors of electricity resists the flow of charge between them. When the magnitude of the accumulated charges become very large, the air which is normally a poor conductor of electricity, is no longer to able to resist their flow.

Hence discharge takes place between negative and positive charges which produce streaks of bright light and sound. We see streaks as lightning.

Discussion

22.	Suggest three measures to protect ourselves from lightning.
Answer» Precautions to be taken to protect ourselves from lightning. 1. Staying in a house or building of low height. 2. If we are travelling in a bus or car, then we are safe inside the car or bus provided doors and windows are closed. 3. If we are in a forest taking shelter under shorter trees than taller trees is a good idea during the thunder storm.

22.

Suggest three measures to protect ourselves from lightning.

Answer»

Precautions to be taken to protect ourselves from lightning.

1. Staying in a house or building of low height.

2. If we are travelling in a bus or car, then we are safe inside the car or bus provided doors and windows are closed.

3. If we are in a forest taking shelter under shorter trees than taller trees is a good idea during the thunder storm.

Discussion

23.	What kind of lens is present in the human eye ?
Answer» Convex lens

Discussion

24.	What is the shape of the top end of a lightning conductor?
Answer» The lightening conductor is made of metal rod with a sharp pointed edge on the top. They are made of conductive material such as copper and aluminium. Copper and its alloys are the most common materials used in lightening conductors.

Discussion

25.	Why are lightning strikes more frequent in hilly areas?
Answer» Hills are above the sea levels and are nearer to the sky. The clouds are closer to the hills as compared to the grounds. As a result, the lightening can strike much easily and frequently in hilly areas.

Discussion

26.	What are the main instruments used by seismologists ? What are the uses of those instruments?
Answer» Seismologists use two main devices to measure an earthquake. 1. Seismograph: The seismograph is an instrument that measures the seismic waves caused by an earthquake. 2. Seismoscope: The seismoscope is an instrument that measures the occurrence or the time of occurrence of an earthquake. The seismoscope is a simple device which can be used without any technological background.

26.

What are the main instruments used by seismologists ? What are the uses of those instruments?

Answer»

Seismologists use two main devices to measure an earthquake.

1. Seismograph: The seismograph is an instrument that measures the seismic waves caused by an earthquake.

2. Seismoscope: The seismoscope is an instrument that measures the occurrence or the time of occurrence of an earthquake. The seismoscope is a simple device which can be used without any technological background.

Discussion

27.	Name the material of which a lightning conductor is made.
Answer» Lightening conductor is a device which is used to protect a tall building from lightening. Lightening conductor is made up of metal which is a good conductor of electricity.

Discussion

28.	“Earthquakes can cause floods, landslides and tsunamis. A major tsunami occurred in the Indian ocean on 26th December 2004. All the coastal areas around the ocean, suffered huge losses.Based on the above information answer the following questions: i) What is the cause for tsunami?ii) What happens when a major tsunami occurs?iii) Name the instrument which is used to detect an earthquake and what are its major parts.iv) What is the effect of earthquake, if the scale of magnitude is recorded more than eight?
Answer» i) Tsunami is caused by sudden movement of the earth that happens under the sea. ii) When tsunami waves become extremely large in height, they .savagely attack coast lines, causing devastating property damage and loss of life. iii) The instrument which is used to detect on earthquake is Seismograph. Major parts of Seismograph are, i) rotating drum ii) chart paper iii) pen iv) pendulum bob v) magnet vi) string iv) If the scale of magnitude is recorded more than 8, the effect of earthquake is property and life damage in areas several hundred kilometers across and it may be causes tsunami also.

28.

“Earthquakes can cause floods, landslides and tsunamis. A major tsunami occurred in the Indian ocean on 26th December 2004. All the coastal areas around the ocean, suffered huge losses.Based on the above information answer the following questions: i) What is the cause for tsunami?ii) What happens when a major tsunami occurs?iii) Name the instrument which is used to detect an earthquake and what are its major parts.iv) What is the effect of earthquake, if the scale of magnitude is recorded more than eight?

Answer»

i) Tsunami is caused by sudden movement of the earth that happens under the sea.

ii) When tsunami waves become extremely large in height, they .savagely attack coast lines, causing devastating property damage and loss of life.

iii) The instrument which is used to detect on earthquake is Seismograph. Major parts of Seismograph are,

i) rotating drum

ii) chart paper

iii) pen

iv) pendulum bob

v) magnet

vi) string

iv) If the scale of magnitude is recorded more than 8, the effect of earthquake is property and life damage in areas several hundred kilometers across and it may be causes tsunami also.

Discussion

29.	What is an earthquake? What are the two main situations in which earthquakes occur?
Answer» Earthquake is the phenomenon in which the earth shakes suddenly for a very short time. It is caused by a disturbance deep inside the earth’s crust. It is the destructive natural phenomenon which cannot be predicted in advance. The earthquakes can cause floods, landslides and tsunamis. Most earthquakes are caused by the movement of earth’s plates. The magnitude (or intensity) of an earthquake is expressed in terms of Richter scale. The destructive earthquakes have magnitudes higher than 7 on the Richter scale. The outermost layer of the earth is fragmented. Each fragment is called a plate. These plates are in continual motion. When they brush past one another, or a plate goes under another due to collision they cause disturbance in the earth’s crust that shows up as an earthquake on the surface of the earth. The tremors on the earth can be caused when a volcano erupts or when a meteor hits the earth. It can also be caused by an underground nuclear explosion.

Discussion

30.	Class 8 Science MCQ Questions of Some Natural Phenomena with Answers?
Answer» MCQ Questions of Some Natural Phenomena will assist students to cover the whole chapter quickly. By solving these questions students can gain their confidence level while writing the ultimate question paper. Students are advised to unravel Class 8 Science MCQ Questions of Some Natural Phenomena, to assist students we’ve provided MCQ Questions with Answers Practice Some of the Multiple Choice Questions of Some Natural Phenomena are given underneath and revise chapters properly. These MCQ Questions for Class 8 Science with Answers are arranged depending on the most recent exam pattern. MCQ Questions for class 8 Science with Answers are prepared as per the newest Exam Pattern. Students can solve Class 8 MCQ Questions and assess their preparation level. Practice Class 8 Science MCQ Questions chapter-wise 1. The process of transfer of charges from a charged object to the earth is called (a) earthing (b) lightning (c) oscillation motion (d) electron movement 2. The power of an earthquake is expressed on a scale called (a) seismic scale (b) iron scale (c) richter scale (d) large scale 3. Which instrument is used to measure earthquakes? (a) Richter scale (b) Seismograph (c) Polygraph (d) None of these 4. Which is not a natural phenomenon? (a) Earthquakes (b) Cyclones (c) Lightning (d) Earthing 5. How many types of charges are gained by rubbing objects? (a) 2 (b) 1 (c) 3 (d) 4 6. A lightning conductor installed in a building : (a) Does not allow the lightning to fall on the building (b) Repels the lightning (c) Forces the lightning to fall in an area where there are no buildings (d) Conducts electric charge to the ground when lightning strikes the building 7. Lightning always follows (a) a thunder (b) rain pour (c) the easiest path (d) a straight path 8. Tsunami means (a) earthquake (b) floods (c) an earthquake under the sea (d) eruption of a volcano in a sea 9. The waves produced on the earth’s surface is called (a) seismic wave (b) longitudinal wave (c) Microwave (d) Radio wave 10. Amber is a (a) metal (b) rubber (c) resin (d) sugar 11. Which is the surest test of charge on a body? (a) Repulsion (b) Lightning (c) Combustion (d) Insulation 12. Which of the following can be charged by rubbing? (a) Ebonite (b) Plastic (c) Amber (d) All of these 13. When two bodies are rubbed against each other : (a) They acquire equal and similar charges (b) They acquire equal and opposite charges (c) They acquire different charges but in different amounts depending upon their masses (d) They do not acquire any charge 14. It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as __________ (a) Negative (b) Positive (c) Neutral (d) Can be anyone 15. A device used to test whether an object is carrying charge or not is called ______. (a) Electrometer (b) Charge meter (c) Electroscope (d) Chargoscope 16. The device that is used to protect buildings from the effects of lightning is: (a) transformer (b) transducer (c) electrode (d) lightning conductor 17. A major earthquake occurred on 26th January 2001 in which part of India? (a) Uri (Kashmir) (b) Mumbai (Maharastra) (c) Guwahati (Assam) (d) Bhuj (Gujarat) 18. During thunderstorm it is safer to (a) Carry an open umbrella (b) Take shelter under short trees (c) Take shelter under tall trees (d) Stand in open fields 19. Like charges (a) attract each other (b) repel each other (c) no interaction takes place (d) none of these 20. The shaking and trembling of the earth is called (a) tsunami (b) volcano (c) earthquake (d) none of these 21. Major earthquakes are less likely to occur in (a) North-East India (b) Rajasthan (c) Rann of Kutch (d) Odisha 22. Lightning always follows (a) rain (b) thunder (c) the easiest path (d) a straight path 23. A major tsunami occurred on 26th December 2004 in which ocean? (a) Indian Ocean (b) Pacific Ocean (c) North Atlantic Ocean (d) South Atlantic Ocean 24. Sparks can be seen on an electric pole when wires become (a) loose (b) tight (c) wrinkled (d) none 25. Which of the following allows the transfer of electric charge from one charged object to another? (a) Vacuum (b) Air (c) Insulator (d) Conductor Answer: 1. Answer: (a) earthing Explanation: The process of transferring of charge from a charged object to the earth is called earthing. 2. Answer: (c) richter scale Explanation: The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. The USGS currently reports earthquake magnitudes using the Moment Magnitude scale, though many other magnitudes are calculated for research and comparison purposes. 3. Answer: (b) Seismograph Explanation: Seismic waves caused by an earthquake, other Earth-shaking phenomenon or explosion are recorded or measure using the instrument called Seismograph. 4. Answer: (d) Earthing Explanation: Earthing is not a natural phenomenon. Types of natural phenomena include Weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, a moonbow, blood moon, and natural disasters such as electromagnetic pulses, volcanic eruptions, earthquakes, midnight sun and polar night. 5. Answer: (a) 2 Explanation: There are two types of charges are gained by rubbing objects. They are positive and negative charges. 6. Answer: (d) Conducts electric charge to the ground when lightning strikes the building Explanation: Lightning conductors are installed in buildings to provide a path for electric discharge during a lightning strike let them reach the ground and protect the building from a lightning strikes. 7. Answer: (a) a thunder Explanation: Lightning always follows thunder because it depends on the speed of sound and light. 8. Answer: (c) an earthquake under the sea Explanation: Tsunami is caused due to disturbance caused by deep down the sea. Lightening will not cause any disturbance for the sea whereas earthquakes, A major nuclear explosion undersea, and Volcanic eruption can cause a disturbance in the sea. 9. Answer: (a) seismic wave Explanation: Seismic waves fall into two general categories: body waves which travel through the interior of the earth and surface waves which travel on the only at the Earth's surface. 10. Answer: (c) resin Explanation: Amber is formed from resin exuded from tree bark, although it is also produced in the heartwood. Resin protects trees by blocking gaps in the bark. Once resin covers a gash or break caused by chewing insects, it hardens and forms a seal. 11. Answer: (a) Repulsion Explanation: Repulsion is being considered as the sure test of charge on body as the induction of charge is possible between an uncharged body and charged body when brought close together. 12. Answer: (d) All of these Explanation: Ebonite gets charged by rubbing on fur. Plastic also gets charged on rubbing by fur. and Amber also gets charged by rubbing on fur. 13. Answer: (b) They acquire equal and opposite charges Explanation: When two bodies are rubbed against each other, some electrons are transferred from one body to another body. Hence one body has a deficiency of electrons and other body has an excess of electron by the same amount. Hence, one body acquire positive while other acquires negative charge of same magnitude. 14. Answer: (b) Positive Explanation: It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as Positive. 15. Answer: (c) Electroscope Explanation: An electroscope is a device that is used for the detection and identification of charges on objects. 16. Answer: (d) lightning conductor Explanation: When a building is hit by lightning, the lightning conductor conducts all charges straight into the Earth thus protecting the building from damage. 17. Answer: (d) Bhuj (Gujarat) Explanation: The 2001 Gujarat earthquake, also known as the Bhuj earthquake, occurred on 26 January, India's 52nd Republic Day, at 08:46 am IST. 18. Answer: (b) Take shelter under short trees Explanation: As the discharge of a huge amount of electric charge prefers the conductors of narrow cross-section, that is, pointed end, lightening always prefers to discharge through the pointed end. Hence, it is safe to take shelter under short trees instead of a single tall tree. 19. Answer: (b) repel each other Explanation: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. 20. Answer: (c) earthquake Explanation: An earthquake is an intense shaking of the Earth's surface. The shaking is caused by movements in Earth's outermost layer. 21. Answer: (d) Odisha Explanation: In Orissa, major earthquakes are less likely to occur. Kashmir, the Western and Central Himalayas, the entire North-East, the Rann of Kutch, Rajasthan, and the Indo-Gangetic Plain are perhaps the most dangerous regions in India. 22. Answer: (b) thunder Explanation: Lightning always follows thunder because it depends on the speed of sound and light. 23. Answer: (a) the Indian Ocean Explanation: The tsunami wave struck havoc in the Indian Ocean on the 26 December 2004. The wave was the result of the earthquake that had its epicenter close to the western boundary of Sumatra. The magnitude of the earthquake was 9.0 on the Richter scale. 24. Answer: (a) loose Explanation: Sparks on an electric pole when wires become loose. This phenomenon is quite common when the wind is blowing and shaking the wires. You might also have seen sparks when a plug is loose in its socket. Lightning is also an electric spark but on a huge scale. 25. Answer: (d) Conductor Explanation: A conductor is any material that allows the passage of free electrons. Examples of conductors include copper and iron. Click here Practice MCQ Questions for Some Natural Phenomena Class 8

30.

Class 8 Science MCQ Questions of Some Natural Phenomena with Answers?

Answer»

MCQ Questions of Some Natural Phenomena will assist students to cover the whole chapter quickly. By solving these questions students can gain their confidence level while writing the ultimate question paper. Students are advised to unravel Class 8 Science MCQ Questions of Some Natural Phenomena, to assist students we’ve provided MCQ Questions with Answers

Practice Some of the Multiple Choice Questions of Some Natural Phenomena are given underneath and revise chapters properly. These MCQ Questions for Class 8 Science with Answers are arranged depending on the most recent exam pattern. MCQ Questions for class 8 Science with Answers are prepared as per the newest Exam Pattern. Students can solve Class 8 MCQ Questions and assess their preparation level.

Practice Class 8 Science MCQ Questions chapter-wise

1. The process of transfer of charges from a charged object to the earth is called

(a) earthing
(b) lightning
(c) oscillation motion
(d) electron movement

2. The power of an earthquake is expressed on a scale called

(a) seismic scale
(b) iron scale
(c) richter scale
(d) large scale

3. Which instrument is used to measure earthquakes?

(a) Richter scale
(b) Seismograph
(c) Polygraph
(d) None of these

4. Which is not a natural phenomenon?

(a) Earthquakes
(b) Cyclones
(c) Lightning
(d) Earthing

5. How many types of charges are gained by rubbing objects?

(a) 2
(b) 1
(c) 3
(d) 4

6. A lightning conductor installed in a building :

(a) Does not allow the lightning to fall on the building
(b) Repels the lightning
(c) Forces the lightning to fall in an area where there are no buildings
(d) Conducts electric charge to the ground when lightning strikes the building

7. Lightning always follows

(a) a thunder
(b) rain pour
(c) the easiest path
(d) a straight path

8. Tsunami means

(a) earthquake
(b) floods
(c) an earthquake under the sea
(d) eruption of a volcano in a sea

9. The waves produced on the earth’s surface is called

(a) seismic wave
(b) longitudinal wave
(c) Microwave
(d) Radio wave

10. Amber is a

(a) metal
(b) rubber
(c) resin
(d) sugar

11. Which is the surest test of charge on a body?

(a) Repulsion
(b) Lightning
(c) Combustion
(d) Insulation

12. Which of the following can be charged by rubbing?

(a) Ebonite
(b) Plastic
(c) Amber
(d) All of these

13. When two bodies are rubbed against each other :

(a) They acquire equal and similar charges
(b) They acquire equal and opposite charges
(c) They acquire different charges but in different amounts depending upon their masses
(d) They do not acquire any charge

14. It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as __________

(a) Negative
(b) Positive
(c) Neutral
(d) Can be anyone

15. A device used to test whether an object is carrying charge or not is called ______.

(a) Electrometer
(b) Charge meter
(c) Electroscope
(d) Chargoscope

16. The device that is used to protect buildings from the effects of lightning is:

(a) transformer
(b) transducer
(c) electrode
(d) lightning conductor

17. A major earthquake occurred on 26th January 2001 in which part of India?

(a) Uri (Kashmir)
(b) Mumbai (Maharastra)
(c) Guwahati (Assam)
(d) Bhuj (Gujarat)

18. During thunderstorm it is safer to

(a) Carry an open umbrella
(b) Take shelter under short trees
(c) Take shelter under tall trees
(d) Stand in open fields

19. Like charges

(a) attract each other
(b) repel each other
(c) no interaction takes place
(d) none of these

20. The shaking and trembling of the earth is called

(a) tsunami
(b) volcano
(c) earthquake
(d) none of these

21. Major earthquakes are less likely to occur in

(a) North-East India
(b) Rajasthan
(c) Rann of Kutch
(d) Odisha

22. Lightning always follows

(a) rain
(b) thunder
(c) the easiest path
(d) a straight path

23. A major tsunami occurred on 26th December 2004 in which ocean?

(a) Indian Ocean
(b) Pacific Ocean
(c) North Atlantic Ocean
(d) South Atlantic Ocean

24. Sparks can be seen on an electric pole when wires become

(a) loose
(b) tight
(c) wrinkled
(d) none

25. Which of the following allows the transfer of electric charge from one charged object to another?

(a) Vacuum
(b) Air
(c) Insulator
(d) Conductor

Answer:

1. Answer: (a) earthing

Explanation: The process of transferring of charge from a charged object to the earth is called earthing.

2. Answer: (c) richter scale

Explanation: The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. The USGS currently reports earthquake magnitudes using the Moment Magnitude scale, though many other magnitudes are calculated for research and comparison purposes.

3. Answer: (b) Seismograph

Explanation: Seismic waves caused by an earthquake, other Earth-shaking phenomenon or explosion are recorded or measure using the instrument called Seismograph.

4. Answer: (d) Earthing

Explanation: Earthing is not a natural phenomenon. Types of natural phenomena include Weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, a moonbow, blood moon, and natural disasters such as electromagnetic pulses, volcanic eruptions, earthquakes, midnight sun and polar night.

5. Answer: (a) 2

Explanation: There are two types of charges are gained by rubbing objects. They are positive and negative charges.

6. Answer: (d) Conducts electric charge to the ground when lightning strikes the building

Explanation: Lightning conductors are installed in buildings to provide a path for electric discharge during a lightning strike let them reach the ground and protect the building from a lightning strikes.

7. Answer: (a) a thunder

Explanation: Lightning always follows thunder because it depends on the speed of sound and light.

8. Answer: (c) an earthquake under the sea

Explanation: Tsunami is caused due to disturbance caused by deep down the sea. Lightening will not cause any disturbance for the sea whereas earthquakes, A major nuclear explosion undersea, and Volcanic eruption can cause a disturbance in the sea.

9. Answer: (a) seismic wave

Explanation: Seismic waves fall into two general categories: body waves which travel through the interior of the earth and surface waves which travel on the only at the Earth's surface.

10. Answer: (c) resin

Explanation: Amber is formed from resin exuded from tree bark, although it is also produced in the heartwood. Resin protects trees by blocking gaps in the bark. Once resin covers a gash or break caused by chewing insects, it hardens and forms a seal.

11. Answer: (a) Repulsion

Explanation: Repulsion is being considered as the sure test of charge on body as the induction of charge is possible between an uncharged body and charged body when brought close together.

12. Answer: (d) All of these

Explanation: Ebonite gets charged by rubbing on fur. Plastic also gets charged on rubbing by fur. and Amber also gets charged by rubbing on fur.

13. Answer: (b) They acquire equal and opposite charges

Explanation: When two bodies are rubbed against each other, some electrons are transferred from one body to another body. Hence one body has a deficiency of electrons and other body has an excess of electron by the same amount. Hence, one body acquire positive while other acquires negative charge of same magnitude.

14. Answer: (b) Positive

Explanation: It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as Positive.

15. Answer: (c) Electroscope

Explanation: An electroscope is a device that is used for the detection and identification of charges on objects.

16. Answer: (d) lightning conductor

Explanation: When a building is hit by lightning, the lightning conductor conducts all charges straight into the Earth thus protecting the building from damage.

17. Answer: (d) Bhuj (Gujarat)

Explanation: The 2001 Gujarat earthquake, also known as the Bhuj earthquake, occurred on 26 January, India's 52nd Republic Day, at 08:46 am IST.

18. Answer: (b) Take shelter under short trees

Explanation: As the discharge of a huge amount of electric charge prefers the conductors of narrow cross-section, that is, pointed end, lightening always prefers to discharge through the pointed end. Hence, it is safe to take shelter under short trees instead of a single tall tree.

19. Answer: (b) repel each other

Explanation: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge.

20. Answer: (c) earthquake

Explanation: An earthquake is an intense shaking of the Earth's surface. The shaking is caused by movements in Earth's outermost layer.

21. Answer: (d) Odisha

Explanation: In Orissa, major earthquakes are less likely to occur. Kashmir, the Western and Central Himalayas, the entire North-East, the Rann of Kutch, Rajasthan, and the Indo-Gangetic Plain are perhaps the most dangerous regions in India.

22. Answer: (b) thunder

Explanation: Lightning always follows thunder because it depends on the speed of sound and light.

23. Answer: (a) the Indian Ocean

Explanation: The tsunami wave struck havoc in the Indian Ocean on the 26 December 2004. The wave was the result of the earthquake that had its epicenter close to the western boundary of Sumatra. The magnitude of the earthquake was 9.0 on the Richter scale.

24. Answer: (a) loose

Explanation: Sparks on an electric pole when wires become loose. This phenomenon is quite common when the wind is blowing and shaking the wires. You might also have seen sparks when a plug is loose in its socket. Lightning is also an electric spark but on a huge scale.

25. Answer: (d) Conductor

Explanation: A conductor is any material that allows the passage of free electrons. Examples of conductors include copper and iron.

Click here Practice MCQ Questions for Some Natural Phenomena Class 8

Discussion

31.	Name one destructive natural phenomenon which cannot be predicted in advance.
Answer» Earthquake is the destructive natural phenomenon which cannot be predicted in advance. The earthquakes can cause floods, landslides and tsunamis. Most earthquakes are caused by the movement of earth’s plates.

Discussion

32.	Explain how lightning would be formed.
Answer» The clouds moving in air acquire a charge on their surface due to the friction with particles of air. As the surface area of a cloud is very large, the amount of charge accumulated on its surface is very high. When a charged cloud comes close to another cloud is induces an opposite charge on the later and the accumulated charge tries to move from one cloud to another cloud. But the air present between them bring a poor conductors of electricity resists the flow of charge between them. When the magnitude of the accumulated charges become very large, the air which is normally a poor conductor of electricity, is no longer to able to resist their flow. Hence discharge takes place between negative and positive charges which produce streaks of bright light and sound. We see streaks as lightning.

32.

Explain how lightning would be formed.

Answer»

The clouds moving in air acquire a charge on their surface due to the friction with particles of air. As the surface area of a cloud is very large, the amount of charge accumulated on its surface is very high.

When a charged cloud comes close to another cloud is induces an opposite charge on the later and the accumulated charge tries to move from one cloud to another cloud. But the air present between them bring a poor conductors of electricity resists the flow of charge between them. When the magnitude of the accumulated charges become very large, the air which is normally a poor conductor of electricity, is no longer to able to resist their flow.

Hence discharge takes place between negative and positive charges which produce streaks of bright light and sound. We see streaks as lightning.

Discussion

33.	What changes the shape of lens in the eye ?
Answer» Ciliary muscles

Discussion

34.	What is the :(a) far point of a normal human eye ?(b) near point of a normal human eye ?
Answer» (a) The far point of a normal human eye is at infinity. (b) The near point of a normal human eye is at 25cm from the eye.

34.

What is the :(a) far point of a normal human eye ?(b) near point of a normal human eye ?

Answer»

(a) The far point of a normal human eye is at infinity.

(b) The near point of a normal human eye is at 25cm from the eye.

Discussion

35.	Name two types of cells in the retina of an eye which respond to light.
Answer» Rods and cones

Discussion

36.	What job does the pupil of the eye do ?
Answer» Pupil expands or contracts according to the intensity of light around the eye.

Discussion

37.	The upper layer of the earth is called A) Crust B) Mantle C) Inner core D) Outer core
Answer» Correct option is A) Crust The answer is A) Crust

Discussion

38.	Increase in 2 in magnitude of richter scale means ……….. times more destructive energy.A) 100 B) 1000 C) 10 D) 10000
Answer» Correct option is B) 1000

Discussion

39.	Find out if there is an organisation in your area which provides relief to those suffering from natural disaster. Enquire about the type of help they render to the victims of earthquakes. Prepare a brief report on the problems of the earthquake victims.
Answer» In India National Disaster Force provides relief for disaster victims. Problems of earthquake victims: 1. Death: Many times, the people who support a family socially and economically dies. This causes most of the other members of the family to either fight their way through, or restart their lives from the bottom of the food chain. 2. Destroyed Structures: If the members of the family survive, then they could still be short of a home. The earthquake would have caused the destruction of their house and because of that, they would be left homeless. 3. No food or water: In the aftermath of an earthquake, people see weather all the pipelines, roads, etc. are in good shape or order. If the pipes are broken, then water scarcity begins. If the roads are broken, then food supplies cannot be transported, later causing problems in food scarcity. 4. Electricity: With inadequate supply of electricity, the debris and rubble will take a lot of time and if people are under it then they may die before the rubble is removed. 5. Spread of diseases: After the destruction of many buildings, the sewer pipes will also break and open, causing spread of diseases everywhere. Help rendered by relief organisation: 1. They minimize the death of people. 2. They provide drinking water and food for victims. 3. They provide shelter for earthquake victims. 4. They provide medical facility for earthquake victims.

39.

Find out if there is an organisation in your area which provides relief to those suffering from natural disaster. Enquire about the type of help they render to the victims of earthquakes. Prepare a brief report on the problems of the earthquake victims.

Answer»

In India National Disaster Force provides relief for disaster victims. Problems of earthquake victims:

1. Death: Many times, the people who support a family socially and economically dies. This causes most of the other members of the family to either fight their way through, or restart their lives from the bottom of the food chain.

2. Destroyed Structures: If the members of the family survive, then they could still be short of a home. The earthquake would have caused the destruction of their house and because of that, they would be left homeless.

3. No food or water: In the aftermath of an earthquake, people see weather all the pipelines, roads, etc. are in good shape or order. If the pipes are broken, then water scarcity begins. If the roads are broken, then food supplies cannot be transported, later causing problems in food scarcity.

4. Electricity: With inadequate supply of electricity, the debris and rubble will take a lot of time and if people are under it then they may die before the rubble is removed.

5. Spread of diseases: After the destruction of many buildings, the sewer pipes will also break and open, causing spread of diseases everywhere.

Help rendered by relief organisation:

1. They minimize the death of people.

2. They provide drinking water and food for victims.

3. They provide shelter for earthquake victims.

4. They provide medical facility for earthquake victims.

Discussion

40.	Hyderabad lies in seismic zone of A) I B) II C) III D) IV
Answer» Correct option is B) II

Discussion

41.	Consider the list of terms given below:(i) Seismic Zone(ii) Fault Zone(iii) Mantle(iv) Inner CoreThe boundaries of the earth’s plate are known as(a) (i) & (ii) (c) (iii) & (iv) (b) (i) & (iii) (d) (ii), (iii) & (iv)
Answer» (a) (i) & (ii)

Discussion

42.	How is the amount of light entering the eye controlled ?
Answer» The amount of light entering the eye is controlled by the iris. It automatically adjusts the size of the pupil according to the intensity of light received by the eye. If the amount of light received by the eye is large, then the iris contracts the pupil and reduces the amount of light entering the eye. If the amount of light received by the eye is small, then the iris expands the pupil so that more light may enter the eye.

Discussion

43.	Seismic waves recorded by an instrument called A) Electroscope B) Galvanometer C) Seismograph D) None of these
Answer» Correct option is C) Seismograph

Discussion

44.	Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Answer» Irises help to protect the retinas of our eyes from damage by bright light by adjusting the size of the pupil according to the intensity of light received by the eye.

Discussion

45.	How do you appreciate the efforts of the scientists to develop a Lightning conductor to protect buildings from the effect of lightning?
Answer» Lightning conductor is a device used to protect buildings from the effect of lightning. A metallic rod, taller than the building is installed in the walls of the building during its construction. One end of the rod is kept out in the air and other is buried deep in the ground. The rod provides an easy route for the transfer of electric charge to the ground. The projected end pf the metal rod is at a height more than the height of the building. Hence it receives the charge first during lightning because it is closer to the cloud than the building. As it is good conductor of electricity, it allows all the charge to flow through it there by causing no damage to the buildings. Hence sole of scientists is appreciated.

45.

How do you appreciate the efforts of the scientists to develop a Lightning conductor to protect buildings from the effect of lightning?

Answer»

Lightning conductor is a device used to protect buildings from the effect of lightning.

A metallic rod, taller than the building is installed in the walls of the building during its construction.

One end of the rod is kept out in the air and other is buried deep in the ground. The rod provides an easy route for the transfer of electric charge to the ground.

The projected end pf the metal rod is at a height more than the height of the building. Hence it receives the charge first during lightning because it is closer to the cloud than the building. As it is good conductor of electricity, it allows all the charge to flow through it there by causing no damage to the buildings. Hence sole of scientists is appreciated.

Discussion

46.	What are seismic zones? Name main seismic zones in India.
Answer» Earthquakes are caused by the movement of plates, the places at boundaries of the plates are considered as weak zones where earthquakes are more likely to occur. These weak zones are also called as seismic or fault zones. The main seismic zones in India are Kashmir, Western and Central Himalayas, the whole of North east, Rann of Kutch, Rajasthan, Indogangetic plane and some areas of South India.

Discussion

47.	What are the places in Andhra Pradesh which lie in seismic zone?
Answer» According to seismic hazard map Andhra Pradesh lies in zones II and III. The south eastern districts of Chittoor, YSR Kadapa, Nellore and Krishna and Godavari delta region have been placed in zone III and the city of Hyderabd lies in zone II.

Discussion

48.	State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.
Answer» People living in seismic zones should take the following measures for protection against earthquakes: 1. The buildings in these zones should be designed so that they can withstand tremors. Modern building technology can make it possible. 2. Mud and timber should be used as a construction material instead of heavy construction material. The roofs should be kept as light as possible. 3. The cupboards and shelves should be fixed to the walls so that they should not fall easily. 4. Clocks, photo frames and water heaters etc. should be hanged carefully at proper places to avoid damage by them. 5. Sometimes the buildings may catch fire during earthquakes. All the buildings, especially the tall buildings should have the firefighting equipment in working order.

48.

State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.

Answer»

People living in seismic zones should take the following measures for protection against earthquakes:

1. The buildings in these zones should be designed so that they can withstand tremors. Modern building technology can make it possible.

2. Mud and timber should be used as a construction material instead of heavy construction material. The roofs should be kept as light as possible.

3. The cupboards and shelves should be fixed to the walls so that they should not fall easily.

4. Clocks, photo frames and water heaters etc. should be hanged carefully at proper places to avoid damage by them.

5. Sometimes the buildings may catch fire during earthquakes. All the buildings, especially the tall buildings should have the firefighting equipment in working order.

Discussion

49.	How do you appreciate the efforts of scientists to develop an instrument to assess the intensity and source of earthquake?
Answer» The efforts of scientists to develop an instrument to assess the intensity and source of earthquake is thoroughly appreciated because they provide assessment of earthquake and what are the rescue measurements to be taken by government and private organizations and also provide preventive measurements that would be taken when earthquake occurs. So these scientists providing life for people and their services are thoroughly appreciated.

Discussion

50.	The instrument is called to approximate measure the intensity of earthquake isA) Seismograph B) Sesmoscope C) Gold leaf electroscope D) Lightening conductors
Answer» Correct option is A) Seismograph

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Improvement of human race by encouraging the healthy persons to marry early and produce large number of children is called _________ (a) Positive eugenics(b) Negative eugenics (c) Positive euthenics (d) Positive euphenics

ABO blood group in man is controlled by ____________ (a) Multiple alleles (b) Lethal genes (c) Sex linked genes (d) Y-linked genes

A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other off springs.

Major earthquakes are less likely to occur in(a) North East India(b) Rajasthan(c) crust(d) inner core

An inflated rubber balloon and a woollen cloth are rubbed together. What type of charge is acquired by (a) woollen cloth, and (b) rubber balloon?

Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father-AB group2. Mother-O group3. Daughter – A group4. Son B-group

A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth. Now, out of glass rod, silk cloth, rubber balloon and woollen cloth: (a) which two objects acquire negative charge? (b) which two objects acquire positive charge?

An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged? A) Inflated rubber balloon B) Woollen cloth C) Ballpoint pen refill D) Polythene bag A. A and B B. B and C C. A and D D. B and D

Which of the following cannot be charged easily by friction? (a). A plastic scale (b). A copper rod (c). An inflated balloon (d). A woollen cloth

List three states in India where earthquakes are more likely to strike.

Three children of a family have blood groups A, AB and B. What could be the geno types of their parents? (a) IA IB and ii (b) IA 1O and IB IO (c) IB IB and IA IA (d) IA IA and ii

Blood groups of father, mother, and their two children are given below. Work out the genotypes of each blood group.1. Father – AB group2. Mother – O group3. Daughter – A group4. Son B – group

What damage can be done when lightning strikes on the earth?

Name two events (other than earthquakes) which can cause tremors on the earth.

How will you charge a plastic comb (plastic scale or plastic pen) by the method of friction?

Major earthquakes are less likely to occur in(a) North East India(b) Rajasthan(c) Rann of Kutch(d) Orissa

How will you charge an inflated rubber balloon by the method of friction?

Where is the upper end of the lightning conductor fixed in a building?

Explain how lightning would be formed?

Suggest three measures to protect ourselves from lightning.

What kind of lens is present in the human eye ?

What is the shape of the top end of a lightning conductor?

Why are lightning strikes more frequent in hilly areas?

What are the main instruments used by seismologists ? What are the uses of those instruments?

Name the material of which a lightning conductor is made.

What is an earthquake? What are the two main situations in which earthquakes occur?

Class 8 Science MCQ Questions of Some Natural Phenomena with Answers?

Name one destructive natural phenomenon which cannot be predicted in advance.

Explain how lightning would be formed.

What changes the shape of lens in the eye ?

What is the :(a) far point of a normal human eye ?(b) near point of a normal human eye ?

Name two types of cells in the retina of an eye which respond to light.

What job does the pupil of the eye do ?

The upper layer of the earth is called A) Crust B) Mantle C) Inner core D) Outer core

Increase in 2 in magnitude of richter scale means ……….. times more destructive energy.A) 100 B) 1000 C) 10 D) 10000

Find out if there is an organisation in your area which provides relief to those suffering from natural disaster. Enquire about the type of help they render to the victims of earthquakes. Prepare a brief report on the problems of the earthquake victims.

Hyderabad lies in seismic zone of A) I B) II C) III D) IV

Consider the list of terms given below:(i) Seismic Zone(ii) Fault Zone(iii) Mantle(iv) Inner CoreThe boundaries of the earth’s plate are known as(a) (i) & (ii) (c) (iii) & (iv) (b) (i) & (iii) (d) (ii), (iii) & (iv)

How is the amount of light entering the eye controlled ?

Seismic waves recorded by an instrument called A) Electroscope B) Galvanometer C) Seismograph D) None of these

Suggest how your irises help to protect the retinas of your eyes from damage by bright light.

How do you appreciate the efforts of the scientists to develop a Lightning conductor to protect buildings from the effect of lightning?

What are seismic zones? Name main seismic zones in India.

What are the places in Andhra Pradesh which lie in seismic zone?

State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.

How do you appreciate the efforts of scientists to develop an instrument to assess the intensity and source of earthquake?

The instrument is called to approximate measure the intensity of earthquake isA) Seismograph B) Sesmoscope C) Gold leaf electroscope D) Lightening conductors