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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 5401. |
Retina,Cornea,Cerebrum, Iris. |
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| 5402. |
Which factors will you consider while designing the pre-disaster management plan for your school/home? Prepare a survey report with the help of your teacher. |
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Answer» SOLUTION :The factors which should be considered while designing the pre-disaster management plan for school or home are as follows: i. Collecting information about type and intensity of disaster that could occur and preparing an action plan accordingly. ii. Trainingn family MEMBERS at home and STUDENTS, teachers and other school staff for disaster management. iii. Keep an EMERGENCY kit ready along with torch, battery, radio, important documents (sealed in a platic bag), non -perishable food, functional fire extinguisher, emergency contact NUMBERS list, first aid kit. etc. iv. Apart from these, mock drill can be conducted in the school to prepare students for facing any disaster. |
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| 5403. |
The magnetic field lines in a given region are getting crowded. What does it indicate? |
| Answer» SOLUTION :The strength of MAGNETIC FIELD is higher in this REGION. | |
| 5404. |
Distinguish between Amphibia and Reptilia: |
Answer» SOLUTION :
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| 5405. |
List two indirect ways of using solar energy. |
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Answer» SOLUTION :(i) WIND ENERGY (II) BIOMASS energy |
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| 5406. |
What is meant by a homologous series ? State the two characteristics of a homologous series. |
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Answer» Solution :Though the length of the carbon chains in carbon compounds is different, their chemical properties are very much similar due to the presence of the same functionalgroup in them. The series of compounds formed by joining the same functional group in place of a particlular hydrogen atom on the chains having sequentially increasing length is called a homologous series. Two adjacement members of the series differ by only one `-CH_(2)-` (methylene) unit and their masses differ by 14 units. The homologous SERIESOF straight CHAIN alkanes can be represented by the general formula `C_(n)H_(2n+2).`The members of this series are as follows :  Characteristics of homologous series : (1) In homologousseries while going in an increasingorder of the length of carbon chain (a) one methylene unit `(-CH_(2)-)` gets added(b) molecular mass increases by 14 u (c) number of carbon ATOMS increases by one. (2) Chemical properties of members of a homologous series show similarity due to the presence of the same functional group in them.(3) Each member of the homologous series can be represented by the same general molecular formula. (4) While going in an increasing order of the length there is gradation in the physicalproperties i.e. the boiling and melting points. |
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| 5407. |
Where shouldan object be placed in front of a convex lens so as to use it as a simple microscope? |
| Answer» Solution :The object should be placed WITHIN the focus of the COVEX LENS to use it as a SIMPLE microscope. | |
| 5409. |
How many 40W,220V lamps can be safety connected to a 220V, 5A line? Justify your answer. |
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Answer» Solution :The current DRAWN by a 40W,220V ELECTRIC LAMP `I_1=P_1/V=40/220=2/11 A` As the electric line is of rating 220V, 5A hence we can connect n lamps in parallel where `n=I/I_1=5/((2/11))=(5 times 11)/2=27.5` THUS, we can safety connect 27 lamps of 40W,220V rating to a 220V,5A line. |
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| 5410. |
How can we decide the direction of electric current in a conductor ? |
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Answer» Solution :We know `I=nqAv_(d).` In this n and A are positive. Hence the DIRECTION of current is determined by the signs of the charge 'q' and drift speed`v_(d).` 1. For electrons, q is NEGATIVE and `v_(d)` is positive. Then the PRODUCT of q and `v_(d)` is negative. So the direction of electric currentis opposite to the flow of negative charge. 2. For positive charges, the product of q and `v_(d)` is positive. Hence, the direction of electric current can be taken as the direction of flow of positive charges. |
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| 5411. |
A circuit has a line of 50A. How nuny lamps of rating 40W, 220 V can simultaneously run on this line safely ? |
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Answer» Solution :I = `(P)/(V) = (40W)/(220 V)= (2)/(11) A = 0.18 ` AMP . `(2)/(11) ` A or 0.18 A currents is required by one lamp. Current RATING (MAXIMUM current ) = 5A. `therefore` No of LAMPS = `("Current rating ")/("Current through one lamp")` = `(5)/(0.18)` = 27 |
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| 5413. |
Irene Curie & Joliot discovered, natural radioactivity. |
| Answer» SOLUTION :IRENE curie & F . Joliot discovered artificial radioactivity | |
| 5414. |
What happens if we replace this cylindrical liquid column with another object which is made up of a material whose density is equal to the density of liquid ? |
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Answer» Solution :We KNOW that the pressure difference in the liquid, `P_(2)-P_(2)=hrhog` `P_(2)-P_(2)=h(m)/(V)grArrP_(2)-P_(1)=h(m)/(Ah)G` `rArrP_(2)-P_(1)=(m)/(A)g` `rArr(P_(2)-P_(1))A=mg` Since F = PA and W = mg We get F = W (Values of displaced liquid) 1. Here 'F' is the force applied on the object and 'W' is the weight of the liquid. 2. So, the force applied on the object by the liquid is EQUAL to the weight of the displaced liquid. |
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| 5415. |
How does the current divide itself in a parallel combination of resistors? |
| Answer» SOLUTION : In a parallel COMBINATION of resistors, the CURRENT DIVIDES in the inverse RATIO of the resistances. | |
| 5416. |
Spontaneous process: Natural Radioactivity :: Induced process: _______________ |
| Answer» SOLUTION :Artificial radioactivity (or) MAN made activity | |
| 5417. |
What is geothermal energy ? |
| Answer» Solution :Heat energy stored in the HOT SPOTS of the Earth.s crust is CALLED geothermal energy. | |
| 5418. |
The distance between optic centre and centre of curvature is called as 'focal length'. |
| Answer» SOLUTION :Correct statement- FOCAL LENGTH of a lens is the distance of its principal focus from its POLE. | |
| 5419. |
Differences between thermal power plant and nuclear power plant. |
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Answer» Solution :(i) Thermal power plant CONSISTS of TWO TOWERS a stack and a cooling TOWER while nuceler power plant consists of only the cooling tower. (ii) The NUCLEAR power plant consists of a nuclear reactor while the thermal power plant does not. |
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| 5420. |
Draw a diagram to show how two resistors R_(1) and R_(2)are connected in parallel. |
Answer» SOLUTION :
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| 5421. |
Which law gives the direction of induced current produced due to electromagnetic induction phenomenon ? |
| Answer» SOLUTION :Fleming.s right-hand RULE. | |
| 5423. |
Complete the chart : Different problems occur with disasters. In the concept map different effects are mentioned. Read it and fill the blank places. |
Answer» SOLUTION : 
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| 5424. |
Explain in short perception of colour. |
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Answer» Solution :In nature wefind objects of various colours. Perception of colour means to be able to respond to colour. (2) We can distinguish between various colours DUE to preceptionof colour . (3)The cone-shaped CELLS on the RETINA of the eye respond to thevarious colourswhen lightis brightand communicate to the brain about the colours of the imageformed on the retina. This gives us the proper idea about the coloursof the object. (4)If, in the retina of a person, the cone-shaped cells responding to certain specific colours are absent, the person is unable to distinguish between the colours . As a RESULT, he lacks perception of colour. |
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| 5426. |
Solar furnace, Microscope, Telescope, Optical instrment. |
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| 5428. |
What is space mission? Explain. |
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Answer» SOLUTION :1.Substantial DEVELOPMENTS in technology, especially space technology, in the laterhalf of twentieth century resulted in the development of spacecraft's making space voyage possible. 2. Since then, more than a thousand artificial SATELLITES have been placed into orbits around the earth. 3. Additionally, space missions have been UNDERTAKEN for CLOSE observation of various objects in our solar system. 4. We can classify the space missions into two categories : (a) In one type of missions, the objective is to put artificial satellites in orbits around the earth-for research and various other useful applications. (b) The objective of second type of missions is to send the spacecrafts to outer space for close observations and understanding of the objects in solar system, or even outside the solar system. |
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| 5429. |
Which device do you to measure current, voltage and resistance ? |
| Answer» SOLUTION :MULTIMETER | |
| 5430. |
Fossil fuels are classified as non-renewable sources of energy. Why ? |
| Answer» Solution :Fossil FUELS like COAL, petroleum, natural gas, etc., if exhausted, cannot be generated rapidly as they take MILLIONS of YEARS to form again. | |
| 5431. |
The figurebelow shows the scale of a voltmeter : The least count of this voltmeter is : |
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Answer» 1 V |
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| 5432. |
What is meant by the statement " potential difference between points A and B in an electric field is 1 volt" |
| Answer» SOLUTION :Work DONE to BRING 1C CHARGE from POINT B to point A is 1 joule. | |
| 5433. |
What are Newton's laws of motion? |
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Answer» Solution :i. Newton's first law of motion: EVERY in animate object continues to be in a state of rest or of uniform motion in a straight line unless it is acted upon by an external unbalanced FORCE. ii. Newton's SECOND law of motion: The rate of change of momentum is directly proportional to the applied force and it takes place in the direction of force. iii.Newton's THIRD law of motion: To every action there is ALWAYS instantaneous, equal and opposite reaction. |
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| 5434. |
TFM in soapsrepresents _________ contentin soap . |
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Answer» mineral |
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| 5435. |
Liquidammonia is used in ice factory for making ice from water. If water at20^(@)Cis to be converted into 2 kg ice at 0^(@)C , how many grams of ammonia are to be evaporated ? (Given : The latent heat of vaporization of ammonia = 341 cal //g) |
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Answer» Solution :Data : `m_(1) = 2 kg , DeltaT_(1) = 20^(@) C -0^(@) C = 20^(@)C` ` c_(1) = 1" kcal/kg."^(@)C , L_(1) ("ice") = 80 "kcal/kg", L_(2)` (vaporization of ammonia) = 341 cal/g = 341 kcal/kg,`m_(2) = ? ` `Q_(1)` = (heat lost by water) = `m_(1)c_(1)DeltaT_(1) + m_(1)L_(1)` 2 kg `xx 1 kcal//kg.^(@)C xx 20^(@)C + 2kg xx 80` kcal/kg 40 Kcal + 160 kcal = 200 kcal ` Q_(2)` ( heat absorbed by ammonia) = `m_(2)L_(2) =m_(2) xx 341` kcal/ kg ltbRgt According to the principal of heatexchange , ` Q_(1) = Q_(2)` 200 kcal. `= m_(2) xx 341` kcal/ kg `m_(2) = 200/341 " kg" =` 0.5864 kg =586 .4 g 586.4 g of ammonia are to be evaporated . |
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| 5436. |
State the laws of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum. b. The absolute refractive indices of two media A and B are 2.0 and 1.5 respectively. If the speed of light in medium B is 2xx10^(8)m//s, calculate the speed of light in (i) vacuum (ii) medium A |
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Answer» Solution :a. Laws of refraction of light: (i) The INCIDENT ray, the normal and the refracted ray at the point of incident all lie in the same plane for the two given transparent medium. (II) Theratio of sine of angle of incidence (i.e sin i) to the the sin of angle of refraction (i./e. sin r) is ALWAYS constant for the light of given colour and for the given pair of media. Mathematically, `(sin i)/(sinr)=` constant =N The constnat n is called refractive index of the second medium with respect to the first medium. Absolute refractive index of the medium is given by `n=("Speed of light in vacuum "(c))/("Speed of light in medium"(V))` b. given `n_(A)=2.0` and `n_(B)=1.5` Speed of light in medium `B=2xx10^(8)` m/s `n_(B)=("Speed of light in vacuum"(c))/("Speed of light in medium B")` `1.5=c/(2xx10^(8))` Speed of light in vacuum `c=2xx10^(8)xx1.5` `=3.0xx10^(8)`m/s Speed of lightin medium A `n_(A)=("Speed of light in vacuum")/("Speed of light in medium A")` `2.0=(3xx10^(8))/("Speed of light in media A")` Speed of light in medium `A=(3xx10^(8))/2` `=1.5xx10^(8)m//s` |
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| 5437. |
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new unit if light takes 8 min and 20 s to cover this distance |
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Answer» Solution :SPEED of LIGHT in VACUUM, `c = 1` new unit of length `s^(–1)` `t=8 MIN. 20 sec, = 500 s` `x=ct=1` new unit of length `s^(-1)xx500s` `x=500` new unit of length |
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| 5438. |
Select two homologous compounds from the following carbon compounds. {:(CH_(4)O,C_(2)H_(6)O_(2)),(C_(2)H_(6)O,C_(3)H_(6)O):} |
| Answer» SOLUTION :`CH_(4)O` and `C_(2)H_(6)O` | |
| 5439. |
____________ mirror is used as a security mirror in shops and on roads at sharp bends and concealed entrances. |
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Answer» Convex |
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| 5440. |
Classify exhaustible resources. |
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Answer» SOLUTION :(A) Renewable resources. These resources are naturally repenished after man.s consumption. (B) Non-Renewable resources cannot be REPLACED faster they are used. They are FOSSIL fuil and mineral ores. |
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| 5442. |
Live wire, Earth wire, Fuse wire, Neutral wire. |
| Answer» Solution :FUSE wire. It protects the ELECTRICAL circuit from SHORT circuitwhereas OTHERS are types of wire used in home electrical connection | |
| 5443. |
Distinguish between real and virtual images. |
Answer» SOLUTION :
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| 5444. |
How can disasters be classified depending upon various criteria? |
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Answer» Solution :i. Disasters can be broadly classifed as: a. Geophysical disasters: These disasters are caused due to internal earth processes or SUDDEN and EXTREME changes in the atmosphere. b. Biological disasters: These dissters arise due to sudden growth of a certatin kinds of plants (weeds), animals or microbes. c. Man-made disasters. These disasters are caused due to man-made factors like industries, technological research etc. ii. Geophysical disasters are further dclassified as: a Geological disasters Examples: Earthquake, tsunami, volcano, landslides, landfall, erosion, flooding etc. b. Atmospheric disasters Examples: Hot and cold wves, snowfall, snow storms, hailstorms, CYCLONES, drought, flood, meteorite impacts , sun spot activity, etc. iii. Biological disasters are further classified as: a. Plant related disasters Examples: Forest fire, weeds INCLUDING aquatic weds, carrot grass and common grass, etc. b. Animal related disasters Examples: Diseases like cholera, malaria, hepatitis, plague caused due to INFECTIOUS viruses and bacteria and spread by insects, bite of poisonous animals, etc. iv. Man-made disasters are of following two types: ltrbgt a. Unpredicatable or unintentional disasters Examples: Leakage of poisonous gases, effects of atomic tests, accidents and other unplanned actions. b. Intentional disasters Examples: War, fire, bomb blast, forced migration, terrorism, rapes, and child labour, etc. |
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| 5445. |
Awareness about organ donation after death is increasing. |
| Answer» Solution :(1) Due to ACCIDENTS or illness, there may be damage to vital organs. (2) Sometimes their ability to FUNCTION at the fullest suffers. (3) There is increased incidence of such cases in recent times. (4) If organs are in good conditions after death, they are retrieved, for transplantation.(5) Many government and socialorganizations are spreading such awareness about body donation. Therefore, GRADUALLY the organ transplantation is increasing. | |
| 5446. |
Give two advantages of using nuclear energy. |
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Answer» Solution :Two ADVANTAGES of using nuclear ENERGY are : (i) Very small mass of Uranium yields tremendous energy. (II) The released energy can be used to produce steam and further GENERATE electricity. |
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| 5447. |
List the colours observed in a spectrum through a prism in the increasing order of their deviation through the prism. |
| Answer» Solution :Red, Orange, Yellow, GREEN, BLUE, INDIGO, and VIOLET. | |
| 5449. |
You are provided with 90 mL of distilled water and 10 mL of concentrated sulphuric acid to prepare dilute sulphuric acid.(i) What is the correct way of preparing dilute sulphuric acid ? Given reason.(ii) How will the concentration of H_(3)O^(+) ions change on dilution ? |
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Answer» Solution :(i) Add 10 mL of concentrated SULPHURIC ACID slowly to 90 mL of distilled water with constant stiring with a GLASS rod.It is a highly exothermic process. If water is added to concentrated sulphuric acid, the heat generated causes the mixture to splash leading to burns. Also, the glass container can break. (ii) Concentration of `H_(3)O^(+)` ion decreases on dilution. |
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| 5450. |
Explain two safety measures commonly used in electric circuits and appliances. |
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Answer» SOLUTION :Fuse being a wire of low melting point, it melts when a LARGE current flows due to short-circuiting or OVERLOADING. Earthing of APPLIANCE : EARTH wire is connected toa plate deep in the earth. If there is leakage of current, it goes to earth. |
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