16569 + Interview Questions in Physics

1.	Question 7 In the arrangement shown in figure there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then (a) the deflection in the galvanometer remains zero throughout (b) there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed (c) there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction (d) there are momentary galvanometer deflections that die out shortly; the deflections are in opposite directions
Answer» Question 7 In the arrangement shown in figure there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then (a) the deflection in the galvanometer remains zero throughout (b) there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed (c) there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction (d) there are momentary galvanometer deflections that die out shortly; the deflections are in opposite directions

Discussion

2.	An object is placed at 60 cm from the pole of a concave mirror, whose focal length is 20 cm. Find the distance at which the image is formed.
Answer» An object is placed at 60 cm from the pole of a concave mirror, whose focal length is 20 cm. Find the distance at which the image is formed.

Discussion

3.	The approximate total mass of a sodium atom is
Answer» The approximate total mass of a sodium atom is

Discussion

4.	Which of the following combinations have the same equivalent resistance between X and Y?
Answer» Which of the following combinations have the same equivalent resistance between X and Y?

4.

Which of the following combinations have the same equivalent resistance between X and Y?

Answer»

Which of the following combinations have the same equivalent resistance between X and Y?

Discussion

5.	The following picture shows three types of radiation a, b, and c penetrating through three different materials. Which of the following matches is correct?
Answer» The following picture shows three types of radiation $a, b,$ and $c$ penetrating through three different materials. Which of the following matches is correct?

5.

The following picture shows three types of radiation a, b, and c penetrating through three different materials. Which of the following matches is correct?

Answer»

The following picture shows three types of radiation $a, b,$ and $c$ penetrating through three different materials.

Which of the following matches is correct?

Discussion

6.	A simple pendulum of frequency n is taken up to a certain height above the ground and then dropped along with its support so that it falls freely under gravity. The frequency of oscillations of the falling pendulum will
Answer» A simple pendulum of frequency n is taken up to a certain height above the ground and then dropped along with its support so that it falls freely under gravity. The frequency of oscillations of the falling pendulum will

Discussion

7.	Three identical bulbs are connected in parallel with a battery. The current drawn from the battery is 6A. If one of the bulbs gets fused, what will be the total current drawn from the battery?
Answer» Three identical bulbs are connected in parallel with a battery. The current drawn from the battery is 6A. If one of the bulbs gets fused, what will be the total current drawn from the battery?

Discussion

8.	Which of the following can form a virtual image which is always smaller than the object ? (a) a plane mirror (b) a convex lens (c) a concave lens (d) a concave mirror
Answer» Which of the following can form a virtual image which is always smaller than the object ? (a) a plane mirror (b) a convex lens (c) a concave lens (d) a concave mirror

Discussion

9.	Which of the following is most effective in coagulating a ferric hydroxide sol [MP PET 1993, 97; M
Answer» Which of the following is most effective in coagulating a ferric hydroxide sol [MP PET 1993, 97; M

Discussion

10.	Melting point of ice __.
Answer» Melting point of ice __.

Discussion

11.	A wire 1 m long has a resistances of 1Ω. It is uniformly stretched, so that its length increases by 25%.Therefore its resistance will increase by:
Answer» A wire 1 m long has a resistances of 1Ω. It is uniformly stretched, so that its length increases by 25%.Therefore its resistance will increase by:

Discussion

12.	How do the (i) thickness and (ii) length of a fuse wire depend on its current rating?
Answer» How do the (i) thickness and (ii) length of a fuse wire depend on its current rating?

12.

How do the (i) thickness and (ii) length of a fuse wire depend on its current rating?

Answer»

How do the (i) thickness and (ii) length of a fuse wire depend on its current rating?

Discussion

13.	A ray of light moving from an optically rarer medium to a denser medium:
Answer» A ray of light moving from an optically rarer medium to a denser medium:

Discussion

14.	Which of the quantity is dimensionless?
Answer» Which of the quantity is dimensionless?

14.

Which of the quantity is dimensionless?

Answer»

Which of the quantity is dimensionless?

Discussion

15.	The magnifying power of a simple microscope when the final image is formed at D = 25 cm from eye is :(f is the focal length)
Answer» The magnifying power of a simple microscope when the final image is formed at D = 25 cm from eye is :(f is the focal length)

Discussion

16.	What is the major difference between Fleming’s right hand rule and left hand rule? the right hand rule is for positive charge then is the left hand rule applicable for negative charge??
Answer» What is the major difference between Fleming’s right hand rule and left hand rule? the right hand rule is for positive charge then is the left hand rule applicable for negative charge??

Discussion

17.	On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.
Answer» On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.

Discussion

18.	Which of the following is/are units of temperature?
Answer» Which of the following is/are units of temperature?

Discussion

19.	A heating coil has a resistance of 200Ω . At what rate will heat be produced in it when a current of 2.5 A flows through it?
Answer» A heating coil has a resistance of $200 Ω$ . At what rate will heat be produced in it when a current of 2.5 A flows through it?

Discussion

20.	The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason.
Answer» The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason.

20.

The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason.

Answer»

The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key.

(a) What will be the polarity at the ends A and B?

(b) How will the compass needle be affected? Give reason.

Discussion

21.	The following questions are about the nuclear reactor of a power plant. (a) Which isotope of uranium produces the energy in the fuel rods? (b) Will the fuel rods last forever? (c) Is the energy produced by nuclear fission or nuclear fusion greater? (d) What is the purpose of using the graphite moderator? (e) What is the function of boron rods in the nuclear reactor? (f) Why is liquid sodium (or carbon dioxide gas) pumped through the reactor?
Answer» The following questions are about the nuclear reactor of a power plant. (a) Which isotope of uranium produces the energy in the fuel rods? (b) Will the fuel rods last forever? (c) Is the energy produced by nuclear fission or nuclear fusion greater? (d) What is the purpose of using the graphite moderator? (e) What is the function of boron rods in the nuclear reactor? (f) Why is liquid sodium (or carbon dioxide gas) pumped through the reactor?

Discussion

22.	Two plastic spheres of masses 10 g and 20 g are moving in a straight line in the same direction with velocities of 3 ms−1 and 2 ms−1 respectively. They collide with each other and after collision, the plastic sphere of mass 10 g moves with a velocity of 2.5 ms−1. Find the velocity of the second ball after collision.
Answer» Two plastic spheres of masses 10 g and 20 g are moving in a straight line in the same direction with velocities of 3 ${m s}^{- 1}$ and 2 ${m s}^{- 1}$ respectively. They collide with each other and after collision, the plastic sphere of mass 10 g moves with a velocity of 2.5 ${m s}^{- 1}$ . Find the velocity of the second ball after collision.

Discussion

23.	If the current is directly proportional to potential difference, then why the is V=IR not I=VR.....
Answer» If the current is directly proportional to potential difference, then why the is V=IR not I=VR.....

Discussion

24.	What is electric current? What is it made of?
Answer» What is electric current? What is it made of?

Discussion

25.	To study the dependence of current (I) on the potential difference (V) across a resistor R, two students used the two set ups shown in figure A and B respectively. They kept the contact point J in four different points marked, (a), (b), (c), (d) in the two figures. For the two students, the ammeter and voltmeter reading will be maximum when the contact J is in the position:
Answer» To study the dependence of current (I) on the potential difference (V) across a resistor R, two students used the two set ups shown in figure A and B respectively. They kept the contact point J in four different points marked, (a), (b), (c), (d) in the two figures. For the two students, the ammeter and voltmeter reading will be maximum when the contact J is in the position:

25.

To study the dependence of current (I) on the potential difference (V) across a resistor R, two students used the two set ups shown in figure A and B respectively. They kept the contact point J in four different points marked, (a), (b), (c), (d) in the two figures. For the two students, the ammeter and voltmeter reading will be maximum when the contact J is in the position:

Answer»

To study the dependence of current (I) on the potential difference (V) across a resistor R, two students used the two set ups shown in figure A and B respectively. They kept the contact point J in four different points marked, (a), (b), (c), (d) in the two figures.

For the two students, the ammeter and voltmeter reading will be maximum when the contact J is in the position:

Discussion

26.	The control rods used in the reactor of a nuclear power plant are made of : (a) steel (b) graphite (c) uranium (d) boron
Answer» The control rods used in the reactor of a nuclear power plant are made of : (a) steel (b) graphite (c) uranium (d) boron

Discussion

27.	Draw a ray diagram to snow the formation of image when an object is placed- (a)between pole and focus (b) at centre of curvature
Answer» Draw a ray diagram to snow the formation of image when an object is placed- (a)between pole and focus (b) at centre of curvature

Discussion

28.	The wavelength of light that has a frequency of 1.20 × 1013s-1 is __________ m.
Answer» The wavelength of light that has a frequency of 1.20 × 10¹³s^-1 is __________ m.

28.

The wavelength of light that has a frequency of 1.20 × 1013s-1 is __________ m.

Answer»

The wavelength of light that has a frequency of 1.20 × 10¹³s^-1 is __________ m.

Discussion

29.	The management of natural resources is important as
Answer» The management of natural resources is important as

Discussion

30.	Show by equations, the effect on the proton number Z and mass number A of the parent nucleus brought about by the two types of radioactive decay. [5 MARKS]
Answer» Show by equations, the effect on the proton number Z and mass number A of the parent nucleus brought about by the two types of radioactive decay. [5 MARKS]

Discussion

31.	In magnet there is North side and South side in that magnet north & north will not be attracted ,South &south also will not be attracted but north south will be attracted why does N & N, S & S will not be attracted to each other why does only N&S are attracted to each other.
Answer» In magnet there is North side and South side in that magnet north & north will not be attracted ,South &south also will not be attracted but north south will be attracted why does N & N, S & S will not be attracted to each other why does only N&S are attracted to each other.

Discussion

32.	When a boy weighing 20 kgf sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.
Answer» When a boy weighing 20 kgf sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.

Discussion

33.	Where will the light rays meet? Here, F1 and F2 represent the primary and secondary focus of the lens respectively.
Answer» Where will the light rays meet? Here, $F_{1}$ and $F_{2}$ represent the primary and secondary focus of the lens respectively.

33.

Where will the light rays meet? Here, F1 and F2 represent the primary and secondary focus of the lens respectively.

Answer»

Where will the light rays meet? Here, $F_{1}$ and $F_{2}$ represent the primary and secondary focus of the lens respectively.

Discussion

34.	Who is sitting between A and H?
Answer» Who is sitting between A and H?

Discussion

35.	With reference to the functioning of the eye, answer the questions that follow : (a) What is meant by power of accommodation of the eye? (b) What is the shape of the lens during (1) near vision (2) distant vision? (c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens. (d) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.
Answer» With reference to the functioning of the eye, answer the questions that follow : (a) What is meant by power of accommodation of the eye? (b) What is the shape of the lens during (1) near vision (2) distant vision? (c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens. (d) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.

35.

With reference to the functioning of the eye, answer the questions that follow : (a) What is meant by power of accommodation of the eye? (b) What is the shape of the lens during (1) near vision (2) distant vision? (c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens. (d) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.

Answer»

With reference to the functioning of the eye, answer the questions that follow :

(a) What is meant by power of accommodation of the eye?

(b) What is the shape of the lens during (1) near vision (2) distant vision?

(c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.

(d) Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.

Discussion

36.	Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations : S.NoObject -DistanceImage - Distanceu (cm)v (cm)1.−100+252.−60+303.−40+404.−30+605.−25+1006.−15+120 (a) What is the focal length of the convex lens? Give reason to justify your answer. (b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion? (c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification.
Answer» Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations : $\begin{matrix} S.No & Object -Distance & Image - Distance u (cm) & v (cm) 1. & - 100 & + 25 2. & - 60 & + 30 3. & - 40 & + 40 4. & - 30 & + 60 5. & - 25 & + 100 6. & - 15 & + 120 \end{matrix}$ (a) What is the focal length of the convex lens? Give reason to justify your answer. (b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion? (c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification.

Discussion

37.	Is rainbow formed inside or outside the earth?
Answer» Is rainbow formed inside or outside the earth?

Discussion

38.	Match the following for a pair of protons: 1. Electrostatic Force I. Attractive 2. Nuclear Force II. Repulsive
Answer» Match the following for a pair of protons: 1. Electrostatic Force I. Attractive 2. Nuclear Force II. Repulsive

Discussion

39.	The following plots represent Boyle's law of an ideal gas. Select the curve where the gas is at a temperature lower than the rest.
Answer» The following plots represent Boyle's law of an ideal gas. Select the curve where the gas is at a temperature lower than the rest.

Discussion

40.	The frequency of alternating current (a.c.) supply in India is : (a) 0 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz
Answer» The frequency of alternating current (a.c.) supply in India is : (a) 0 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz

40.

The frequency of alternating current (a.c.) supply in India is : (a) 0 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz

Answer»

The frequency of alternating current (a.c.) supply in India is :

(a) 0 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz

Discussion

41.	A concave lens has a focal length of 50 cm. Calculate its power.
Answer» A concave lens has a focal length of 50 cm. Calculate its power.

Discussion

42.	Why are Thermal Power Stations usually located near a river ?
Answer» Why are Thermal Power Stations usually located near a river ?

Discussion

43.	Question 16 Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure 10.6? (a) Fig. A (b) Fig. B (c) Fig. C (d) Fig. D
Answer» Question 16 Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure 10.6? (a) Fig. A (b) Fig. B (c) Fig. C (d) Fig. D

Discussion

44.	Calculate the load current and load voltage in the following transformer circuit. Source : 30v AC, Np = 100, Ns =100, Rs =100 Ω
Answer» Calculate the load current and load voltage in the following transformer circuit. Source : 30v AC, Np = 100, Ns =100, Rs =100 Ω

Discussion

45.	Figure 5.6 shows a point source of light S, a convex lens L and a plane mirror M. The three are placed such that rays of light from S return to it after reflection from M. (a) What is the distance OS called? (b) To which point (left of S, on S, or right of S) will the rays return if M is moved to the left and brought in contact with L? [2 MARKS]
Answer» Figure 5.6 shows a point source of light S, a convex lens L and a plane mirror M. The three are placed such that rays of light from S return to it after reflection from M. (a) What is the distance OS called? (b) To which point (left of S, on S, or right of S) will the rays return if M is moved to the left and brought in contact with L? [2 MARKS]

Discussion

46.	Question 25 What is the commercial unit of electrical energy? Represent it in terms of joules.
Answer» Question 25 What is the commercial unit of electrical energy? Represent it in terms of joules.

Discussion

47.	Explain the process of Anodising?
Answer» Explain the process of Anodising?

Discussion

48.	Give practical application of concave mirro
Answer» Give practical application of concave mirro

Discussion

49.	Distinguish between alternating current and induced current(3 mark)
Answer» Distinguish between alternating current and induced current(3 mark)

Discussion

50.	Sound wave has different speeds in different mediums because
Answer» Sound wave has different speeds in different mediums because

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An object is placed at 60 cm from the pole of a concave mirror, whose focal length is 20 cm. Find the distance at which the image is formed.

The approximate total mass of a sodium atom is

Which of the following combinations have the same equivalent resistance between X and Y?

The following picture shows three types of radiation a, b, and c penetrating through three different materials. Which of the following matches is correct?

A simple pendulum of frequency n is taken up to a certain height above the ground and then dropped along with its support so that it falls freely under gravity. The frequency of oscillations of the falling pendulum will

Three identical bulbs are connected in parallel with a battery. The current drawn from the battery is 6A. If one of the bulbs gets fused, what will be the total current drawn from the battery?

Which of the following can form a virtual image which is always smaller than the object ? (a) a plane mirror (b) a convex lens (c) a concave lens (d) a concave mirror

Which of the following is most effective in coagulating a ferric hydroxide sol [MP PET 1993, 97; M

Melting point of ice __.

A wire 1 m long has a resistances of 1Ω. It is uniformly stretched, so that its length increases by 25%.Therefore its resistance will increase by:

How do the (i) thickness and (ii) length of a fuse wire depend on its current rating?

A ray of light moving from an optically rarer medium to a denser medium:

Which of the quantity is dimensionless?

The magnifying power of a simple microscope when the final image is formed at D = 25 cm from eye is :(f is the focal length)

What is the major difference between Fleming’s right hand rule and left hand rule? the right hand rule is for positive charge then is the left hand rule applicable for negative charge??

On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.

Which of the following is/are units of temperature?

A heating coil has a resistance of 200Ω . At what rate will heat be produced in it when a current of 2.5 A flows through it?

The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason.

If the current is directly proportional to potential difference, then why the is V=IR not I=VR.....

What is electric current? What is it made of?

The control rods used in the reactor of a nuclear power plant are made of : (a) steel (b) graphite (c) uranium (d) boron

Draw a ray diagram to snow the formation of image when an object is placed- (a)between pole and focus (b) at centre of curvature

The wavelength of light that has a frequency of 1.20 × 1013s-1 is __________ m.

The management of natural resources is important as

Show by equations, the effect on the proton number Z and mass number A of the parent nucleus brought about by the two types of radioactive decay. [5 MARKS]

In magnet there is North side and South side in that magnet north &amp; north will not be attracted ,South &amp;south also will not be attracted but north south will be attracted why does N &amp; N, S &amp; S will not be attracted to each other why does only N&amp;S are attracted to each other.

When a boy weighing 20 kgf sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.

Where will the light rays meet? Here, F1 and F2 represent the primary and secondary focus of the lens respectively.

Who is sitting between A and H?

Is rainbow formed inside or outside the earth?

Match the following for a pair of protons: 1. Electrostatic Force I. Attractive 2. Nuclear Force II. Repulsive

The following plots represent Boyle's law of an ideal gas. Select the curve where the gas is at a temperature lower than the rest.

The frequency of alternating current (a.c.) supply in India is : (a) 0 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz

A concave lens has a focal length of 50 cm. Calculate its power.

Why are Thermal Power Stations usually located near a river ?

Question 16 Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure 10.6? (a) Fig. A (b) Fig. B (c) Fig. C (d) Fig. D

Calculate the load current and load voltage in the following transformer circuit. Source : 30v AC, Np = 100, Ns =100, Rs =100 Ω

Question 25 What is the commercial unit of electrical energy? Represent it in terms of joules.

Explain the process of Anodising?

Give practical application of concave mirro

Distinguish between alternating current and induced current(3 mark)

Sound wave has different speeds in different mediums because

In magnet there is North side and South side in that magnet north & north will not be attracted ,South &south also will not be attracted but north south will be attracted why does N & N, S & S will not be attracted to each other why does only N&S are attracted to each other.