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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.
| 6351. |
What do you mean by triple point of water? Why it is unique? |
| Answer» SOLUTION :It is the TEMPERATURE at which the THREE phases of WATER and gas of water are equaly stable. | |
| 6352. |
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5Omega,8Omegaand12Omega and a plug key, all connected in series. |
Answer» SOLUTION :
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| 6353. |
What will be the effect on yourself and surrounding, if any accident like disaster occurs during the sports on playground or in school? |
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Answer» Solution :If any kind of disaster occurs during sports on a playground or in school, its effect will be as follows: i. Students may get hurt or harmed due to the disaster. II. There may be chaos and confusion due to panic among the CHILDREN and others in the school. III. The chaos may further lead to DISASTERS like stampede. IV. Also, there is a possibilit of damage to the school building and premises. |
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| 6354. |
What is the function of an earth wire ? Why is it necessary to earth metallic appliances |
| Answer» SOLUTION :The metalic body of electric appliances is CONNECTED to the earth by means of earth WIRE so that any leakage of electric current is transferred to the GROUND, This prevents any electric shock to the user. That is why earthing of the ELECTRICAL appliences is necessary. | |
| 6355. |
A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is |
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Answer» `U // G` |
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| 6356. |
……. is an controlled manner. |
| Answer» SOLUTION :ARTIFICIAL RADIOACTIVITY | |
| 6357. |
Which factors affect the environment ? How ? |
| Answer» SOLUTION :The natural as well as artificial or man-made factors AFFECT the environment. Among natural factors, the SUDDEN changes in the weather, the different types of natural disasters, etc. affect the normal environment. Due to such changes there are problems in the interrelationships that exist between food chain and food web. Due to various man-made causes, there are extreme DESTRUCTION of environment. Industrialization, the pollution due to such industries, Urbanization, hunting and poaching of wild animals, construction of dams, roads, bridges, etc. are all man-made changes that cause a lot of damage to environment. | |
| 6358. |
The potential difference between the terminals of an electric heater is 110V, when its draws a current of 5A from the source. What current will the heater draw and what will be its wattage if the potential difference is increased to 220V. Consider that the resistance of the heater element does not change with temperature. |
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Answer» Solution :As here V=110V and l=5A HENCE resistance of the electric HEATER `R=V/I=110/5=22 Omega` when potential difference is INCREASED to `V.=220V` then (i) the current `I.=V./R=220/22=10A` (b) the POWER `P.=V.I.=220 times 10=2200W =2.2 kW` |
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| 6359. |
The forces each of magnitude 10N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4m which is pivoted at its mid point O as shown is fig. 1.30, Determine the magnitude of the resultant moment of forces about the pivot O. |
| Answer» SOLUTION :40 NM (CLOCKWISE) | |
| 6360. |
Two 60W bulbs are used for 4hours everyday and five 100W bulbs are used for 5 hours everyday. How many units of electricity will be consumed in 30 days? |
| Answer» SOLUTION :89.4 UNITS | |
| 6361. |
Is it possible to have an accelerated motion with a constant speed? Name such type of motion. |
| Answer» SOLUTION :YES, UNIFORM CIRCULAR MOTION | |
| 6362. |
Which hormone is referred as ''flight and fight'' hormone ? |
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Answer» |
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| 6364. |
Why are mock drills conducted? |
| Answer» Solution :Mock DRILLS are conducted to check the PREPAREDNESS of the people in a locality, premise or building to face a disaster. | |
| 6365. |
Why do human beings have important place in environment. |
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Answer» Solution :1. Human life is an integral part of nature and human survival is closely linked with environment. ii. Due to rapid increase in human population industrialization, humans haveoverutilized natural resource, leading to DEGRADATION of environment. iii. The environment INFLUENCES the life of human BEINGS and also human modify their environment as humans are the apex predators inthe FOOD chain. IV. Humans are capable of conserving and improving the quality of nature and thus, can play a major role in maintaining environmental balance. Humans therefore have an imporatant place in the environment. |
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| 6366. |
What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ? What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ? |
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Answer» Force needed = mg `(sin alpha + mu cos alpha)ma.` |
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| 6367. |
Make a list of the work that we doin our day - to - day life using energy. Which forms of energy do we use to do this work ? Discuss with your friends. |
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Answer» Solution :i. Heat energy is used to cook food . ii. ELECTRICAL energy is used for running electrical appliances such as FAN TV , computeretc. III. Sound energyis generated using CHEMICALENERGY stored in our body while speaking. iv. KINETIC energy is used for runing cycling etc. |
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| 6368. |
During a planed manoeuvre in a space flight, a free floating astronaut A pushes another free floating astronaut B, the mass of A being greaterthan that of B. Then the magnitude of the force exerted by astronaut A on astronaut B is |
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Answer» EQUAL to zero |
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| 6369. |
One micro ampere is equal to 10^(-3) A. |
| Answer» Solution :One micro AMPERE is EQUAL to `10^(-6) A`. | |
| 6370. |
The line joining the places on earht having same values of g are called |
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Answer» isobars |
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| 6371. |
Name the three types of wires used in householdcircuits withtheir respectivecolours ofinsulationare as follows : (1) Live(Positive) wirehas red insulation . (2) Neutral (Negative) wirehas black insulation cover. (3) Earth wirehas insulationof green colour . |
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Answer» SOLUTION :Three types of wireused in householdcircuits withtheir respectivecolours of insulation are as FOLLOWS : (1) LIVE (Positive) wier has redinsulation cover . (2) NEUTRAL (Negative) wire has BLACK insulaiton cover . (3) Earth wire has insulation of green colour. |
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| 6372. |
The SI unit of Radioactivity is |
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Answer» CURIE |
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| 6373. |
Nichrome is used to make the element of an electric heater. Why? |
| Answer» Solution :NICHROME is an ALLOY having high RESISTIVITY and high melting point | |
| 6374. |
The velocity which is sufficient to just escape from the gravitational pull of the earth is |
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Answer» DRIFT VELOCITY |
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| 6375. |
The object distance of a lens is -30 cm and image distance is -10 cm. Find the magnification of the lens. With the help of this, decide whether the size of the image is smaller or bigger than the size of the object. |
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Answer» SOLUTION :u=-30cm v=-10cm `m=v/u=(+10)/30=1/3` The size of the image is SMALLER than the size of the OBJECT. |
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| 6376. |
A girl was playing with a thin beam of light from a laser torch by directing it form different directions on a convex lens held vertically. She was surprised to see that in a particular direction, the beam of light continues to move along the same direction after passing through the lens. State the reason for the observation. Draw a ray diagram to support your answer. |
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Answer» SOLUTION :When the girl observes that the light beam CONTINUES to MOVE along the same direction even after passing through LENS, the beam must have been DIRECTED along the direction of optical centre O of the lens. It is because, only a light ray passing through optical centre of the lens goes undeviated. Ray diagram is shown here. 
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| 6377. |
Internet is my friend. i. Noise Pollution ( Regulation and Control )Rules , 2000. ii. Biomedical Waste ( Management and Handling ) Rules, 1998. iii. E-Waste ( Management and Handling ) Rules, 2011. |
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Answer» Solution :i. The Noise pollution ( Regulation and Control ) Rules, 2000 specifies ambient air qualify standard in respect of noise for DIFFERENT areas `//` zones( industrial , commercial , residential orsilence ares `//` zone ) . One can be penalized for violation in silence areas `//` zones for committing the following actions `:` a. BLOWING a horn b. Playing any music or using any sound amplifier. c. Beating a drum or blowing a horn or trumpet or playing any instrument. d. Exhibiting to attract mimetic , MUSICAL or otherperformance to attract crowds. ii. The Government of India published Biomedical Waste ( MANAGEMENT and Handling) Rules on July27,1998 . The salient features of the Biomedical Waste Rules are as follows `:` a. These rules deal with the generation, handling , treatment and disposal of biomedical waste. b. These rules apply to all persons who generate ,collect , receive , STORE, transport,treat, disposeor handle biomedical waste in any form.ltbr. c. It is the duty of the occupant to take all steps to ensure that such waste is handled without any adverse effect to human health and environment. d. These rules specify biomedical waste management procedures. iii. The E-waste rules are applicable to all procers and consumersof electrical and electronic goods to manage the E-waste generated. |
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| 6378. |
Name a substance whose resistance almost remains unchanged With a change in temperature. |
| Answer» SOLUTION : MANGANIN (an alloy of CU, MN and NI) | |
| 6379. |
How is the amount of light entering the eye controlled ? |
| Answer» Solution :The iris REGULATES the amount of light ENTERING the EYE by ADJUSTING the size of the PUPIL of the eye. | |
| 6380. |
The blood sucking habit of leech is known as __________ . |
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Answer» HERBIVOROUS |
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| 6381. |
In whatwayhygroscopicsubstancesdifferfromdeliquescentdubstances . |
Answer» Solution :(i) Difference between hygroscopic and deliquescent substances is in the extent to which each MATERIAL can absorb MOISTURE. This is because both the these terms are very much RELATED to each other and they refer to the property of observing and the RETENTION of moisture from the air. however, they differ in the extent of absorption of moisture where hygroscopic materials absorb moisture but not the extent the original substance dissolves in it, which is the casewith deliquescence. therefore deliquescence can be regarded as an extreme condition of hygroscopic activity.  (ii) It is defined as the number of grams of a solute that can be dissolved in 100g of a solvent to form its SATURATED solution at a given temperature and pressure. |
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| 6382. |
At the time of short circuit, the current in the circuit ............ |
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Answer» increases |
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| 6383. |
Which of the following reactions is an endothermic reaction ? |
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Answer» BURNING of coal. |
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| 6384. |
Name the non-essential and essential organs of a flower. |
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Answer» SOLUTION :The outermost WHORLS calyx and COROLLA are non-essential whorls of a flower, as they do not directly take PART in the REPRODUCTION. Androcium and Gynoecium are the essential whorls, because both take part directly in reproduction. |
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| 6385. |
i] Define electric potential difference. How is ammeter connected in an electric circuit ? ii] Explain the application of heating effect of electric current E in an electric bulb and the fuse used in an electric circuit. |
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Answer» Solution :i] Potential DIFFERENCE is defined as the difference in electrical potential energy between two points. An ammeter is connected in series in an ELECTRIC circuit. ii] When electric current is PASSED through a bulb, its filament gets heated to a very high temperature. The electrons in the filament get excited and emit light. Thus, heating effect of electric current is used to produce light energy in an electric bulb. A fuse is a safety device used in electric circuits and is made of a wire of metal or alloy with low melting point and high resistance. When a high current flows in a fuse, it heats the wire in the fuse and melts it thereby breaking the circuit. Thus, fuse protects electrical appliances from GETTING damaged. |
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| 6386. |
The optical prescription for a pair of spectacles is, Right eye : + 2.50 D and Left eye : + 4.00 D. Which of the following statement is true for above condition? |
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Answer» The lens of left eye has greater focal length. |
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| 6387. |
What do you mean by overload ? |
| Answer» SOLUTION :When a HIGH current flows through the wire which BEYOND the rating of wire then HEATING of wire TAKES place. This phenomen is called overloading. | |
| 6388. |
Classify the following things into substances having Relative Density gt 1 and Relative Density lt 1. Wood, iron, rubber, plastic, glass, cork, air, coal, ice, wax, paper, milk, kerosene, groundnut oil, soap. |
Answer» SOLUTION :
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| 6389. |
The persistence of hearing for human beings is not more than |
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Answer» 1 s |
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| 6390. |
Calculate the number of electrons constituting one coulomb of c.harge. (charge on 1 electron =1.6xx10^(-19) C) |
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Answer» Solution :Charge on ONE ELECTRON = `1.6xx10^(-19)C` Therefore, `1.6xx10^(-19)C` charge carried by one electron. Therefore, 1 C charge carried by `1/(1.6xx10^(-19))=6.25xx10^(18)` electrons. |
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| 6391. |
The density of a cube is measured by measuring its mass and length of its side. If the maximum errors in the measurements of mass and length are 3% and 2% respectively. Then the maximum error in the measurement of density is : |
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Answer» 0.07 |
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| 6392. |
Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the sun's energy ? |
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Answer» GEOTHERMAL ENERGY |
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| 6393. |
Magnetic field lines are shown In the given diagram. A student makes a statement that magnetic field at X is stronger than at Y. Justify this statement.Also redraw the diagram and mark the direction of magnetic field lines . |
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Answer» Solution :The relative strength of the magnetic field is SHOWN by the degree of CLOSENESS of the field lines. The degree of closeness is more at .X. than at .Y.. `therefore ` The field is stronger at X where the field lines are CROWDED. 
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| 6394. |
The rms speed of oxygen molecules at a certain temperature T is v. If the temperature is doubled and oxygen gas dissociates into atomic oxygen, then the rms speed |
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Answer» SOLUTION :`c=sqrt((3RT)/(M))=V`, `c'=sqrt((3R(2T))/(M//2))=2sqrt((3RT)/(M))` `c'=2v` |
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| 6395. |
Give the examples of each. Activities under the jurisdiction of cyber crime laws. |
| Answer» Solution :Heacking of mails, or information, Bank transactions using PIN, using social networking sites to send derogatory massages, VULGAR IMAGES, etc. | |
| 6396. |
What is an electric fuse ? What is its role in the electric circuits? Should it be placed on the neutral wire or on the live wire ? Justify your answer . |
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Answer» Solution :Afuse is safety device consisting of a thin wire MADE of an alloy of tin and lead having a low melting POINT. If high current flows through it due to short circuit or overloading, fuse wire melts and breaks the circuitoff the supply of ELECTRICITY. Thus, the fuse protects the appliances fromgetting damaged, protects the user from electric shock, and prevents thepossibility of fire. Since the live wire carries electricity, a fuse should be placed in the live wireto function properly.NEUTRAL wire is at zero POTENTIAL and does notcarry electricity. If the fuse is connected to the neutral wireand if a short circuit or an overloading occurs, high current continues to flowthrough the live wire and the fuse does not blow off. |
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| 6397. |
Explain the role of latent heat in the change of state of a substance. |
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Answer» Solution :i. The heat energy required to change substance from one state to another at constant temperature is called as latent heat of substance. ii. When latent heat is supplied to a substance it is utilised for WEAKENING the bonds between ATOMS or molecules of the substance. iii. When solid substance is provided with latent heat of fusion, weakening of bonds results into distancing of atoms or molecules of solids and eventually it changes into liquid state. iv. Similarly, when liquid substance is provided with latent heat of vaporisation, it changes into gaseous state. ltbr. v. Conversely when latent heat is released or GIVEN off from a substance, it results into strengthening the bonds between atoms or molecules causing change of state of the substance. VI. When a liquid substance gives off latent heat of fusion, bonds between atoms or molecules grow STRONGER bringing them closer and eventually liquid changes into solid. vii. Similarly, when a gaseous substance gives off latent heat of vaporisation, it changes into liquid. 
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| 6399. |
Why cannot we read a printed page by holding it very close to our eyes ? |
| Answer» SOLUTION :When we hold a printed page very CLOSE to our eyes (at distance LECC than `25 cm` , which is least distance of distinct VISION of normal eye), we may see a blurred image and ALSO feel strain in the eyes. This is because focal length of eye lens cannot be decreased below a certain minimum limit. | |
| 6400. |
The final image formed by the astronomical telescope is 'erect image'. |
| Answer» Solution :Correct statement- The FINAL IMAGE is an INVERTED image. | |