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InterviewSolution
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.
| 3801. |
Compare the permanent magnet and an electromagnet. |
Answer» SOLUTION :
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| 3802. |
Say True or False.The gravitational acceleration does not become zero at the centre of the Earth. |
| Answer» Solution :FALSE. The gravitational acceleration BECOMES zero at the CENTRE of the Earth | |
| 3803. |
Define 1N. |
| Answer» Solution :The amount of force REQUIRED for a body of MASS 1 kg produces an ACCELERATION of ` 1 MS^(-2), 1N=1 kg ms^(-2)` . | |
| 3804. |
A body falls freely under gravity from rest. Name the kind of energy it will possess (a) at the point from where it falls, (b) while falling, (c) on reaching the ground. |
| Answer» Solution :(a) Potential ENERGY, (B) Potential energy and KINETIC energy (C) Kinetic energy | |
| 3805. |
(a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtural, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why? (b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror, whose radius of curvature is + 24 cm. |
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Answer» Solution :(a) When the image of object for all POSITIONS in front of MIRROR is diminished, ERECT and virtual, the mirror must be convex. In Fig. A'B' is virtual, erect and diminished image of object AB held in front of a convex mirror. A convex mirror is USED as a rear view mirror by drivers of automobiles. (b) RADIUS of curvature of a spherical mirror is the radius of the sphere of which spherical mirror is a part. When `R = +24 cm` `f = R//2 = + 24/2 = + 12 cm` The mirror is convex mirror. 
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| 3806. |
How many natural satellites does the earth have? |
| Answer» SOLUTION :The earth has only one natural SATELLITE which is the moon. | |
| 3807. |
In question number nine the time taken by the bady to reach the highest point is |
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Answer» 1.43 s |
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| 3808. |
The gravitational SI unit of weight is |
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Answer» KG wt |
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| 3809. |
What is meant by the power of a lens? What is its S.I. unit? Name the type of lens whose power is positive. The image of an object formed by a lens is real, inverted and of the same size as theobject. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens? Draw ray diagram tojustify your answer. |
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Answer» Solution :(i) Power of LENS- (ii) S.I. UNIT is DIOPTRE. (III)Convex lens has positive power. (iv) `v=+40 cm, h.=h` The lens is real inverted and of same size `:.` object is at 2F `2f=40: f=20cm`  |
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| 3810. |
What are laughter clubs ? |
| Answer» Solution :The newly popularized CONCEPT WHEREIN, people COME together in a public PLACE like park or garden and laugh loudly for FIXED time duration, to relieve mental stress is known as laughter club. | |
| 3813. |
In a circuit four resistors of 1 Omega ,2 Omega, 6 Omega and 12 Omega respectively are connected in series combination. The maximum resistance that can be obtained is |
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Answer» `21 OMEGA` `R=R_1+R_2+R_3+R_4=(1+2+6+12) Omega=21 Omega` |
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| 3814. |
Define the kilocalorie. |
| Answer» Solution :The amount of heat NECESSARY to RAISE the TEMPERATURE of 1 KGOF water by `1^(@)C ` from `14.5^(@)C ` to `15.5^(@)C ` is CALLED one kilocalorie. | |
| 3815. |
How do you differentiate homologous organs from analogous organs? |
Answer» Solution :(i)  (ii) The TRACHEAL WALLS of RABBIT are supported by rings of CARTILAGE which help in the free passage of AIR. |
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| 3816. |
Can a room be cooled by opening the door of refrigerator in a closedroom ? |
| Answer» SOLUTION :No, It is a VIOLATES SECONDS LAW. | |
| 3817. |
When white light is dispersed into seven colours by a prism, ………… lightbends the least. |
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Answer» VIOLET |
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| 3818. |
Why nuclear fusion is called thermonuclear reaction ? |
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Answer» Solution :The process in which TWO lighter nuclei combine to form a heavier nucleus is termed as .nuclear fusion. EG. `""_(1)H^(2)+ ""_(1)H^(2) to ""_(2)He^(4)+ Q`(Energy) |
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| 3819. |
What was Chipko Andolan "? How did this Andolan ultimately benefit the local people and the environment ? |
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Answer» Solution :Chipko Andolan (HUG the Trees Movement ) was a movement started by women of Reni village in Garhwal , who hugged the trees trunks PREVENTING the contractors from felling the trees. This Andolan quikly spread to other parts of the country and forced the government to RETHINK their priorities in the use of forest produce . consequently , the local people were benefitted .The environment was saved from permannent damager . It AFFECTED the quality of soil and the sources of water were affected in a GOOD way. |
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| 3820. |
You must have come across the three R's to save the environment : Reduce, Recycle and Reuse. Explain Reduce in detail. |
| Answer» Solution :From .REDUCE. we mean using things in lesser amount. It means we should not collect or purchase things for storing. We should buy thing in quantities which are actually needed. We must save electricity. This can be done by SWITCHING off lights, fans , coolers, are - CONDITIONERS when not in use. We must not leave any food in the plates. We must save water. For this we should repair the LEAKING taps, etc. | |
| 3821. |
In figure below, all the bulbs are identical. The bulb that lights most brilliantly is |
| Answer» Solution :A bulb will GLOW with MAXIMUM brilliancy, for which current is maximum and the maximum current flows in bulbs 1 and 5. | |
| 3822. |
Describe the graphical method to calculate the instantaneous speed at a given point. |
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Answer» Solution :1) Consider a car moving along a straight road with varying speed. 2) Take time elapsed on X - axis and distance covered on Y - axis and PLOT a GRAPH for its motion at regular intervals of time. 3) A general case of motion with varying speed is shown in the figure. 4) The AVERAGE speed during the time interval from `t_(1)` to `t_(2)` which INCLUDES the instant `t_(3)` is `(s_(2)-s_(1))/(t_(2)-t_(1))` 5) Then we calculate average speed for a very short time interval encompassing the time at an instant `t_(3)` which is so short interval, that value of average speed would not change materially if it was made even shorter. 6) The instantaneous speed is represented by the slope of the curve at a given instant of time. 7) The slope can be found by drawing a tangent to the curve at that point. 8) The slope of the curve GIVES speed of the car at that instant. 
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| 3823. |
The refractive index of diamond is 2.42. What is the meaning of this statement ? |
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Answer» SOLUTION :When we say that REFRACTIVE INDEX of diamond is 2.42, it means that speed of light in diamond `= ("Speed of light in VACUUM")/(2.42) = (3 xx 10^(8) m//s)/(2.42) = 1.24 xx 10^(8) m//s`. |
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| 3824. |
Name the physical quantity which is measured in calorie.How is it related to the S.I. unit of that quantity? |
| Answer» SOLUTION :Here energy,1 CALORIE =4.18 JOULE | |
| 3825. |
Statement 1: People engaged in minute woek often have to wear reading glasses. Statement 2: This causes stress on the ciliary muscles of the eye. Explain Statement 1 with the help of Statement 2. |
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Answer» Solution :1. People ENGAGED in minute work have continuous stress on the ciliary muscles of the eye which WEAKENS them. 2. This decreases the capacity of eye lens to reduce its focal length . ltbr. 3. Due to this, reading small print BECOME difficult. 4. Hence, readinglight before ENTERING the eye lens, so the image can be formed on the RETINA. |
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| 3826. |
It was found that water from a river was contamainated with Coliform bacteria. Which one of the following pollutant might have got mixed with the water ? |
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Answer» Fertiliser run off |
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| 3827. |
The artificial satellites have various other types of ......... .... , depending on their functions. |
| Answer» SOLUTION :INSTRUMENTS | |
| 3828. |
Compare and contrast fossil fuels and the Sun as direct source of energy. |
Answer» SOLUTION :
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| 3829. |
An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size. |
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Answer» Solution :As radius of curvature of mirror R = 30 CM, hence f = R/2 = 30/2 = 15 cm. It is a convex mirror. Therefore, f = + 15 cm, U = -20 cm, h = 5.0 cm As `(1)/(v) + (1)/(u) = (1)/(f) rArr (1)/(v) + (1)/(-20) = (1)/(15) rArr (1)/(v) = (1)/(15) + (1)/(20) rArr (1)/(v) = (7)/(60)` `therefore ""v = + (60)/(7)` cm = + 8.6 cm The image is virtual and erect and is formed behind the mirror. `m = - (v)/(u) = - (60//7)/(-20) = (3)/(7)` `therefore` The size of image, h. = m.h = `(3)/(7) xx 5 cm = (15)/(7) cm = 2.2` cm |
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| 3830. |
Give the examples of each. Physical problems arising due to excessive use of mobile phones. |
| Answer» SOLUTION :BODY pain, weak BONES of CHILDREN, mental ILLNESS, etc. | |
| 3831. |
A body is moving with initial velocity 30 m/s. After certain time it acquires velocity of 40 m/s, then the velocity in middle of its journey is |
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Answer» `25sqrt2` |
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| 3832. |
A hot plate of an electric oven connected to a 220V line, has two resistance coils A and B , each of 24 Omega resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases? |
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Answer» Solution :It is given that potential difference `V=220V` resistance of coil A `(R_A)` = Resistance of coil B `(R_B)=24 Omega` (i) When EITHER coil A or B is used SEPARATELY, the current `I=V/R_A=V/R_B=(220V)/(24 Omega)=9.2 A` (ii) When the two coils are used in series, total resistance `R_s=R_A+R_B=24+24=48 Omega` `therefore` Current flowing `I=V/R_s=(220V)/(48 Omega)=4.6 A` (iii) When the two coils are used in parallel , total resistance `R_p` is given by `1/R_p-1/R_A+1/R_B=1/24+1/24=2/24=1/12 implies R_p=12 Omega` `therefore` Current flowing `I=V/R_p=(220V)/(12 Omega)=18.3 A` |
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| 3833. |
Doctor has prescribed a lens having power +2 D. What will be the focal length of the lens ?What is the type of the lens and what must be the defect of vision ? |
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Answer» <P> Solution :Data : `P=+2 D, F=?`FOCAL LENGTH of the lens `f=1/P =(1)/(2 D)``= 0.5 m` P is POSITIVE . This shows that the lens is CONVEX. The defect of vision is farsightedness (hypermetropia). |
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| 3834. |
How does the rate of a reaction depend upon the temperature of reactants ? Give a suitable example ? |
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Answer» Solution :(1) When the temperature of the reactants is increased, the reactant molecules start moving with more velocity and their kinetic energy increases. As a result, the number COLLISIONS increases. Hence the rate of chemical reaction inreases. (20 Lime stone on heating decomposes to give ` CO_(2)` , which turns lime water milky. on the other hand, the lime water does not turn milky before heating the lime stone : because of the zerorate of reaction . The above observation indicates that the rate of a reaction inreases. on increasing the temperature. (ii) Solid ` CaCO_(3)` does not decompose at room temperature when HEATED, it decomposes to give CaO and ` CO_(2)`that means the rise in temperature increases the rate of reactions. ` CaCO_(3) OVERSET(" Room temperature ")to ` No Chemical reaction. ` CaCO_(3)overset(Delta)to CaO + CO_(2) uarr` |
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| 3835. |
A body of mass 60 kg has momentum of 3000 km s^(-1) Calculate : (i) the kinetic energy and (ii) the speed of the body. |
| Answer» Solution : (i) `7.5 xx 10^(4)` J. (ii) 50 m `s^(-1)` | |
| 3836. |
Mention any three endangered heritage place in India. |
| Answer» SOLUTION :The WESTERN Ghats, Manas wildlife sanctuary of ASSAM and SUNDARBAN sanctuary of West BENGAL. | |
| 3837. |
In order to make an efficient solar cooker, the cover of cooker box should be made of : |
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Answer» TRANSPARENT plastic sheet |
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| 3839. |
What are causes of pollution of Ganga ? |
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Answer» Solution :Pollution of Ganga. The Ganga runs its course of over 2500 km from Gangotri in the Himalayas to Ganga Sagar in the Bay of Bengal. 1 It is being turned into a drain by more than a hundred TOWNS and cities in Uttar Pradesh, Bihar andWest Bengal that pour their garbage and EXCRETA into it.Largely untreated sewage is dumped into the Ganges everyday. 2 Pollution caused by other human activities like bathing, washing of clothes and IMMERSION of ashes or unburnt corpses. 3 Industries contribute chemical effluents to Ganga.s pollution load and the toxicity kills fish in large sections of the river. Ganga Action Plan was launched in 1985 to improve the QUALITY of water. |
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| 3840. |
What is co-efficient of cubical expansion ? |
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Answer» Solution :(i) The RATIO of INCREASE in volume of the body per DEGREE rise in temperature to its UNIT volume is called as co-efficient of cubical . EXPANSION (ii) It's measured in `K^(-1)`. |
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| 3841. |
Response is the link between emergency measures and national progress. |
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| 3842. |
A body dropped from top of tower falls through 60 m during the last 2 seconds of its fall. The height of tower is (g = 10m//s^(2)) |
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Answer» 95 m `v=u+a t=0+g(t-2)` distance traveled by ball in last 2sis given by `h_(1)=v t+(1)/(2) at^(2)` `60=g(t-2)xx2+(1)/(2) g(4)=20(t-2)+20` at 4S, HEIGHT of tower `=(1)/(2)g t^(2)=(1)/(2)xx10xx 4^(2)=80m` |
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| 3843. |
Draw the electric circuit with the help of a Battery, Voltmeter, Ammeter, Resistance and connecting wires. |
Answer» SOLUTION :
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| 3844. |
Which are the three main parts of the body of a hemichordate animal ? |
| Answer» SOLUTION :The HEMICHORDATE animal's body is made up of PROBOSICS , COLLAR and TRUNK. | |
| 3845. |
Arrange in order accordingly how a bulb gives out light waves. Transerve waves, Filamentheated, Light energy, Electric current. |
| Answer» SOLUTION :Electric current, Filament HEATED, Light energy , TRANSVERSE WAVES | |
| 3846. |
Explain the kinetic interpretation of Temperature. |
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Answer» Solution :According to kinetic theory of gases, the pressure P exerted by one mole of an ideal gas is given by `P = 1/3 rhoC^(2) implies P = 1/3 M/V C^(2)` `( :. "density" , rho = M/V)` `implies PV = 1/3 MC^(2)` But `PV = RT` `:. C^(2) = (3RT)/(M) or C^(2) prop T implies C prop sqrt(T)` or `sqrt(T) prop C` where C is RMS velocity eof gas . Thus, the SQUARE root of the absolute termperature of an idea gas is DIRECTLY proportional to root mean square velocity or its molecules. ALSO, from eqn. (1) `1/3 M/(N_A) C^(2) = R/(N_A) T = k_(B)T implies 1/2 mc^(2) = 3/2 k_(B)T` `implies 1/2 mc^(2) prop T( :. 3/2 k_(B)` is CONSTANT) But , `1/2 mc^(2)` is average translational K.E. per molecule of a gas. Therefore, average kinetic energy of translation per molecule of a gas is directly proportional to the absolute temperature of the gas. |
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| 3847. |
In our country, there seems to be lack of awareness regarding reproductive health. Why? · |
| Answer» Solution :There is lack of awareness regarding reproductive HEALTH in India due to illiteracy and ignorance. There are WEIRD social CUSTOMS and taboo, SHYNESS. Many traditions make people secretive about the reproductive health and THUS the problems spread far and wide. | |
| 3848. |
Theelectronic configurations of the four elements A, B, C and D are given below: A - 2, 1 "" B - 2, 2 "" C - 2, 8, 2 "" D - 2 (a) Which amongst these elements belong to same group? Write chemical name of any one of these. (b) Which amongst these elements belong to same period? Write chemical name of any one of these. (c) Which amongst these is not a metal? Write its chemical name. |
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Answer» SOLUTION : (a) B and C,Beryllium/Magnesium (b) A and B, Lithium/Beryllium (c) D, HELIUM |
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| 3849. |
(a) For which colour of white light, is the refractive index of a transparent medium (i) the least, (ii) the most ? (b) Which colour of light travels fastest in any medium except air ? |
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| 3850. |
If kinetic energy of a body is increased by 300%, then percentage change in momentum will be |
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Answer» SOLUTION :`K.E.=(p^(2))/(2m)` so `p=sqrt(2mk)` INCREASE in K.E. `=300%` of `k=3k` Final K.E. `k'=k+3k=4k` Final MOMENTUM `p'=sqrt(2mk')=sqrt(2mxx4k)=2sqrt(2mk)` `=2p` % increase in momnetum `=(p'-p)/pxx100=100%` |
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