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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.
| 9102. |
Name the physical quantities which are indicated by the direction of thumb and forefinger in the Fleming's right-hand rule. |
| Answer» Solution : THUMB indicates the MOTION of conductor and forefinger indicates the direction of MAGNETIC field. | |
| 9103. |
Gently strike a hanging bell and try to listen to the sound produced by it with a stethoscope keeping it both at bottem portion and top portion of the bell. Isthe pitch and loudness of the sound same at the two potion ? Why? |
| Answer» Solution :No. The bob of the bell strikes at the BOTTEM PORTION of the bell. Hence the PITCH and loudness are HIGH. | |
| 9104. |
{:("1.Natural radioactivity", (a) 3.7 xx 10^(10) "decay / second"), ("2. Artificial radioactivity", "(b) spontaneous process"), (3. "1 curie", (c) 10^(6) "decay / second"),(4. "1 Rd (Rutherford)" , "(d)induced process"):} |
| Answer» SOLUTION :1. (B) spantaneous process 2. (d) induced process 3. (a)` 3.7 XX 10^(10) "DECAY / second"`4. (c) 10 decay / second | |
| 9105. |
What is the average energy released from a single fission process ? |
| Answer» SOLUTION :The average ettergy RELEASED from a single lission PROCESS is about `3.2 XX 10^(-11)J`. | |
| 9106. |
What isan electricmotor ? State some uses of electricmotor. |
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Answer» Solution :An elelctricmotor is a device thatconverts ELECTRICAL energyinto mechanical energy . Electricmotor is used in electricfans refrigerator , mixers, WASHING machines , computers, MP3 PLAYERS, etc . |
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| 9107. |
In the above problem, minimum work is done when the body is |
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Answer» pushed over an inclined PLANE |
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| 9108. |
Which of the following can undergo nuclear fusion reaction ? |
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Answer» URANIUM |
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| 9109. |
Explain with diagram step-by-step energy conversion in: Solar thermal power plant : |
Answer» Solution : Solar radiation is used to produce thermal energy. For this purpose, many reflectors are used which concentrate the solar radiation on absorbers. The HEAT energy created due to solar RADIATIONS is used to make steam. The steam POSSESSES kinetic energy. This kinetic energy drives turbine and GENERATOR. The electrical energy is thus created from this kinetic energy. |
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| 9111. |
Identify the emergent ray in the given figure |
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Answer» CD |
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| 9112. |
Why does a compass needle get deflected when brought near a bar magnet ? |
| Answer» Solution :Compass NEEDLE gets DEFLECTED DUET to attractive or repulsive interactions between its magnetic FIELD and the magnitic field of the bar MAGNET. | |
| 9114. |
A ray of light continues to move along the same path while passing through an air-glass interface. The angle of incidence for the light ray is |
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Answer» `90^(@)` |
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| 9115. |
In a game of tug of wars, a condition of equilibrium exists. Both the team pull the rope with a force of 10^4N. The tension in the rope is – |
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Answer» `10^(4)N` |
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| 9116. |
When ice melts, the change in internal energy is greater than the heat supplied. Why ? |
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Answer» SOLUTION :`dq=DU+dw` `du =dq-pdv` |
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| 9117. |
A given length of a wire is doubled of itself and this process is repeated once again. By what factor does the reeutance of the wire changes ? |
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Answer» Solution :Length `(1)/(4)` and area 4 times `R=RHO(L)/(A) =rho(l)/(4xx4A)=(R)/(16) ` (decreases) |
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| 9118. |
Name the award given in the memory of Amrita Devi Bishnoi. |
| Answer» SOLUTION :Amrita Devi Bishnoi AWARD for WILDLIFE conservation. | |
| 9119. |
Four students recorded the readings of the current by observing the position of pointer on the ammeter scale given below : If there is no zero error, the correct reading of current is : |
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Answer» 2.3 A |
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| 9120. |
What is the function of pupil of the human eye ? |
| Answer» Solution :The function of pupil is to control the amount of LIGHT ENTERING into the EYE LENS. | |
| 9121. |
Give any one factor that influences the direction of motion of a cunent carrying conductor in a magnetic field. |
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Answer» |
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| 9122. |
How does a metal conduct electricity ? |
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Answer» Solution :You would think that low-energy ELECTRON would have great difficulty in passing through a solid conductor. Inside the solid, the atoms are packed together with very little spacing between them. But it turns out that the electrons are able to travel through a perfect solid crystal smoothly and easily, almost as if they were in vacuum. The .motion of electrons in a conductor, however, is very different from that of charges in empty space. When a STEADY current flows through a conductor, the electrons in it move with a certain average .drift speed.. One can calculate this drift speed of electrons for a typical copper wire carrying a small current, and it is found to be actually very small, of the order of 1 mm `s^(-1)`. How is it, then, that an electric bulb lights up as soon as we turn the switch on? It cannot be SAID that a current STARTS only when an electron from one terminal of the electric supply physically reaches the other terminal through the bulb, because the physical drift of electrons in the CONDUCTING wires is a very slow process The exact mechanism of the current flow, which takes place with a speed close to the speed of light, is fascinating, but it is beyond the scope of this book. |
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| 9123. |
a) Whatis an esterification reaction ? (b) Write a chemical equation in each case to represent the following types of chemical reaction of organic compounds : (i) Oxidation reaction (ii) Addition reaction (iii) Substitution reaction. |
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Answer» Solution :When carbonic acid reacts with alcohol n the presenee of cone. `H_(2)SO_(4),` pleasant fruity smelling COMPOUND is formed this type of reaction is called esterification reaction. `underset("Ethanoic acid")(CH_(3)COOH_(1))+ underset("Ethanol")(C_(2)H_(5)OH_(1))underset(H_(2)SO_(4))overset("ALKALINE")rarr underset("Ethyl ethanoate")(CH_(3)COOC_(2)H_(5(1)))+ underset("Water")(H_(2)O_(1)`) (i) Oxidation reaction : `underset("Ethanol")(CH_(3)CH_(2)OH)+2[O] underset("KMnO"_(4))overset("Alkaline")rarr underset("Ethonoic")(CH_(3)COOH+H_(2))O` (ii) Addition rection: `underset ("Ethene")(CH_(2))=CH_(2)+H_(2)underset("573K")overset("Ni")rarr CH_(3)- CH_(3)` (iii) Substitution reaction : `underset("METHANE")(CH_4)+Cl_(2) overset("Sunlight")rarr underset("Methylchoride")(CH_(3)Cl+HCl)` |
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| 9124. |
Draw a labelled diagram of an electricmotor . Explain its princpleand working . Whatis thefunction of thesplit ring in an electricmotor ? |
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Answer» SOLUTION :For labelleddiagramand working of an electricmotorsee answer to the Q.32 . For principlesee answer to theQ.31 of Question and Answer section . The function of the split RING: Due TOTHE split ringcommutatorin anelectric motor , the directionof the currentthrough the coilis reversed after everyhalfrotation ofthe coil . Thisreverses the direction ofthe force actingon thetwo arms of the coil . The arm that was earlier PUSHED downward in now pushed upwardsdownward is now pushed upward. whilethe other arm is now pushed downward. THEREFORE , the coilcontinues to rotate in the same direction . |
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| 9125. |
Meteorite, Flood, Snow fall, Earthquake |
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Answer» Solution :EARTHQUAKE Earthquake is a GEOLOGICAL, GEOPHYSICAL disaster, whereas the rest ane atmospheric, geophysical DISASTERS. |
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| 9126. |
The focal length of the lens in the human eye is maximum when it is looking at an object at |
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Answer» a very SMALL DISTANCE from the eye |
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| 9127. |
(a) Explain the principle of an electric generator. (b) State two ways in which the current induced in the coil of a generator could be increased. |
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Answer» |
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| 9129. |
What would have been the colour of the sky, in the absence of atmosphere ? |
| Answer» Solution :The SKY appears BLUE SINCE the air molecules in the earth.s atmosphere scatter blue COLOUR of sunlight more than other colours. In the absence of any atmosphere, there would be no scattering of sunlight and the sky would appear DARK. | |
| 9130. |
Vasantha is a domestic help (or maid) working at Mrs. Sharma's home. One day Vasantha complained to Mrs. Sharma that she had difficulty in reading the letter which she had received from her parents. Mrs. Sharma, realising that Vasantha had an eye defect, look her to an eye-specialist doctor. The doctor tested her eyes carefully and told Vasantha to wear spectacles for Vasantha. By wearing these spectacles, Vasantha could read and write easily. She was very happy and thanked Mrs. Sharma. (a) What could be the eye-defect Vasantha was suffering from ? (b) What could be the eye-defect reasons responsible for her eye-defect. (c) What type of lenses do you think doctor recommended for Vasantha's spectacles ? Why ? (d) Do you think Vasantha has to wear the spectacles all the time ? Give reason for your answer. (e) What values are displayed by Mrs. Sharma in this episode ? |
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Answer» Solution :(a) VASANTHA was suffering from an eye defect called hypermetropia (long-sightedness or far-sightedness) in which a person cannot see the nearby things clearly (though he or she can see the distant things clearly). (b) (i) Low converging power of eye lens (because of eye lens being less convex or less thick). (ii) Eye-ball being too short (because of which the distance of retina from the eye lens is less than normal). (c) The doctor recommended convex lenses for the SPECTACLES of Vasantha. This is because convex lenses are converging lenses which will increase the converging power of the convex eye lenses. (d) No, Vasantha does not have to wear these spectacles all the TIME. She has to wear these spectacles only while reading, writing, sewing, etc. (because only her near vision is defective). (e) Mrs. Sharma displayed the values of (i) Awereness, which means having KNOWLEDGE of a situation or facts (because she knew that Vasantha's eye defect can be rectified by a using sepctacles) (ii) Concern for others (to mitigate their suffering), and (iii) Kindness and generosity (because Mrs. Sharma bought spectacles for Vasantha by spending her own MONEY). |
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| 9131. |
Water is pumped out of a well 10 m deep by mean of a pump rated at 10 kW . Find the efficient of the motor if 4200 kg of wateris pumped out every minutes . Take g=10 ms ^(-2). |
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Answer» SOLUTION :INPUT power `=10KW` Out PUT power `=W/t=(mgh)/t=7KW` `:.` Effiiency `=("Output power")/("Input power")xx100=70%` |
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| 9132. |
Various dangerous events occur many times in the environment are called ............. |
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Answer» |
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| 9133. |
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate :(i) the work done,and (ii)The power developed by him .Take g =10 N kg^(-1) |
| Answer» SOLUTION :(i)5000 J, (II)1000 W | |
| 9134. |
In Q 63 above ,if the elevator moves down with a constant acceleration , the apparent weight of the person is |
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Answer» less than its TRUE weight This weight acts on the weighing machine which offers a reaction R, given by the reading of the weighing machine. (i)When the elevator is at rest or moving with UNIFORM velocity , upwards or downwards , apparent weight R = mg , which is the actual weight . (ii)When the elevator is accelerating downwards with acceleration a , we have mg - R =ma or R= m(g-a) In this case , apparent weight becomes less. (iii) When the elevator is accelerating upwards with acceleration a , we have R- mg=ma or R=m(g+a) In this case , apparent weight becomes more . (iv)If a=g,R=m(g-g)=0 So , the apparent weight of a person in an elevator falling down freely with an acceleration (=g) is zero . |
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| 9135. |
A force of 100 N gives a mass m1, an acceleration of 10"ms"^(-2) "and of 20ms"^(-2) to a mass m^2. What acceleration must be given to it if both the masses are tied together ? |
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Answer» Solution :Suppose, a= acceleration PRODUCED if `m_1 and m_2` are tied TOGETHER, F= 100 N Let `a_1 and a_2` be the acceleration produced in `m_1 and m_2,` RESPECTIVELY. `a_(1)=10ms^(-2), a_(2)=20ms^(-2)("given")` Again `m_(1)=F/a_(1) and m_(2)=F/a_(2)` `rArr m_(1)=(100)/(10)=10ms^(-2)` `and m_(2)=(100)/(20)=5 ms^(-2)` `therefore m_(1)+m_(2)=10+5=15` So, `a=(F)/(m_(1)+m_(2))=(100)/(15)=(20)/(3)` `=6.67 ms^(-2)` |
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| 9136. |
In a certain village the sex ratio is very low due to large number of cases of female infanticide. A man from the same village takes his pregnant wife to the doctor to find out whether the foetus is a girl or a boy. The doctor performs a test and tells them that it is a girl. Answer the following questions based on the above situation: (i) Name the technique used by doctor to determine the type of sex of the foetus. (ii) Which values are disrespected by the doctor in the above situation? (iii) Suggest two actions to be taken by the administration/society to promote desired related values. |
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Answer» Solution :(i) The technique used to determine the type of SEX of the foetus is called amniocentesis. (ii) Value for LIFE, professional ethics, gender BIAS. (III) Enactment of law. - awareness campaigns about declining sex ratio and its ill effects. - education of WOMEN. |
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| 9137. |
Explain the following sentence with neat diagram. A tree far away from us can get hidden behind a book held very close to our eyes. |
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Answer» Solution :i. Every object placed in front of our eyes subtends an ANGLE with the eye. ii. The apparent size of the object depends on the angle subtended by that object with our eye. iii. As shown in the figure, the tree even though large in size being far away (at point P') subtends SMALLER angle `(beta)` with the eye.  iv. Whereas, if we hold a BOOK very close to eye, i.e., at point P, then the book subtends larger angle `(alpha)` with the eye. v. As `alpha` is greater than `beta`, the apparent size of the book is bigger than that of tree. In this way, a tree far away from us can GET hidden behind a book held very close to our eyes. |
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| 9138. |
Which of the following are characteristics of a good energy source ? |
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Answer» EASILY stored |
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| 9139. |
Physics teacher was explaning to his students in class that our eyes can live even after our death. He told them that by donating our eyes after we die, one pair of our eyes can give vision to two corneal blind people. Eye donors may being to any sex or any age group. People suffering from diabetes, hypertension, asthma or any other non-communicable disease can donate eyes. Eye Banks have been established for this purpose, where you can pledge to donate your eye after your death. Read the above passage and answer the following questions : (i) Can people who have been using spectacles or those who have been operated for cataract donate their eyes ? (ii) Why is the pledge necessary ? (iii) Do you intend to make such a pledge ? Why ? |
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Answer» SOLUTION :(i) YES, people who have been using spectacles or those who have been operated for cataract can donate their eyes. (ii) The eyes have to be removed from your dead body and then implanted in two corneal blind people. Your PERMISSION in the from of pledge is essential. Infact, the pledge is to be signed in the presence of your near and dear ones. who will be incharge of the body after you die. (iii) Yes, I am determined to make a pledge for such a noble cause. I would have already USED my eyes for the WHOLE of my life. After I die, if both my eyes can be used to give vision to two corneal blind people, I will be blessed not only by those two people, but also by Gold almightly. Helping the under privileged creatures without losing anything is a wonderful thought and action. |
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| 9140. |
What are the reasons related to problems of vision? |
Answer» SOLUTION :Problems of vision are related to weakening of ciliary muscles, CHANGE in the size of the EYEBALL, irregularities on the surface of CORNEA and formation of a meabrane over the EYE lens.
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| 9141. |
The mechanical advantage of an ideal single movable pulley is: |
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Answer» 1 |
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| 9143. |
Solvethe follwing example .A currentthrougha horizontalpowerline flows in east to westdirection .Whatis the directionof magneticfieldat a point directlybelowit andat a pointdirectly aboveit ? |
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Answer» SOLUTION :The CURRENTIS in the east - westdirection . Applyingthe right - handthumbrule , weget that the magneticfield ( at any point belowor abovethe wire ) turnsclockwiseina planeperpendicular to the wire, whenviwedfrom theeast end ,andanticlcokwise, whenview fromthe west end . Hence, at a pointdirectly abovethe horizontalpower line , the magnetic FIELD Bpoints in the northdirectionand atpointdirectly belowit , magneticfieldB POINTIN the SOUTHDIRECTION. |
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| 9146. |
In the experimentto show that a current - carrying condcutor(rod) when placed in a unifrom magnetic fieldexperiencea force .Whatwill happen if youexperiences a force . What will happen if you interchange ther terminalsof thebattery connected in the circuit ? |
| Answer» SOLUTION :THECONDUCTOR (ROD) will be deflected in the oppostie DIRECTION as the direction of the currentis reversed . | |
| 9147. |
The quantity of heat required to raise one mole through 1K for a monoatomic gas at constant volume is |
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Answer» `(3)/(2)R` |
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| 9148. |
What is angle of prism ? What is its value in an equilateral prism ? |
| Answer» Solution :Angle of PRISM is the angle between any TWO adjoining RECTANGULAR surfaces of the prism.For an equilateral prism,angle of prism is `60^@`. | |
| 9149. |
Point to be kept in mind for verification of ohm's law is ammeter should be connected in __________ andvoltmeter in ____________. |
| Answer» SOLUTION :SERIES, PARALLEL | |
| 9150. |
Light always travelss along curved line. |
| Answer» Solution :CORRECT statement-Light always travels ALONG STRAIGHT LINE. | |