16569 + Interview Questions in Physics

1.	Question 7 List three sources of magnetic fields.
Answer» Question 7 List three sources of magnetic fields.

Discussion

2.	White light is considered to be
Answer» White light is considered to be

Discussion

3.	Three bulbs 40w, 60 w and 100 w are connected to 220 v mains. Which bulb will glow brightly, if they are connected in series.
Answer» Three bulbs 40w, 60 w and 100 w are connected to 220 v mains. Which bulb will glow brightly, if they are connected in series.

Discussion

4.	Explain how an opaque object can be made translucent and what are hot and cold sources of light?
Answer» Explain how an opaque object can be made translucent and what are hot and cold sources of light?

Discussion

5.	Which of the following points can be attributed as a reason for deviation of apparent position of a star from its actual position?
Answer» Which of the following points can be attributed as a reason for deviation of apparent position of a star from its actual position?

Discussion

6.	When magnetic field lines are closer, the magnetic field is ___.
Answer» When magnetic field lines are closer, the magnetic field is ___.

Discussion

7.	Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:
Answer» Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:

Discussion

8.	An object is placed at a distance of one and a half of the focal length of a concave mirror. Find the position of image in terms of 'f'. Also find the magnification and nature of image formed by a concave mirror.
Answer» An object is placed at a distance of one and a half of the focal length of a concave mirror. Find the position of image in terms of 'f'. Also find the magnification and nature of image formed by a concave mirror.

Discussion

9.	The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at a distance of 40 cm from the mirror, where is the object placed ? Where would the image be if the object is moved 20 cm towards the mirror ? State reason and also draw ray diagram for the new position of the object to justify your answer.
Answer» The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at a distance of 40 cm from the mirror, where is the object placed ? Where would the image be if the object is moved 20 cm towards the mirror ? State reason and also draw ray diagram for the new position of the object to justify your answer.

Discussion

10.	The best conductor of electricity among the following is:
Answer» The best conductor of electricity among the following is:

Discussion

11.	With the help of a diagram of experimental setup describe an activity to show that the force acting on a current carrying conductor placed in a uniform magnetic field increases with increase in the field strength.
Answer» With the help of a diagram of experimental setup describe an activity to show that the force acting on a current carrying conductor placed in a uniform magnetic field increases with increase in the field strength.

Discussion

12.	The electrode connected to negative terminal of a battery is called___.
Answer» The electrode connected to negative terminal of a battery is called___.

Discussion

13.	Heat and temperature can be respectively defined as
Answer» Heat and temperature can be respectively defined as

Discussion

14.	Various components of a step-down transformer are
Answer» Various components of a step-down transformer are

Discussion

15.	Name the liquid metal that CFL bulbs contain which is detrimental to environment.
Answer» Name the liquid metal that CFL bulbs contain which is detrimental to environment.

Discussion

16.	Solar energy is an inexhaustible natural resource because:
Answer» Solar energy is an inexhaustible natural resource because:

Discussion

17.	Discuss the law of conservation of momentum.
Answer» Discuss the law of conservation of momentum.

Discussion

18.	What is degraded energy?
Answer» What is degraded energy?

Discussion

19.	If total internal reflection takes place only when light ray moves from optical denser to optical rarer... But during rainbow formation total internal reflection takes place when light enters from air to a water drop that is from rarer medium to denser medium which is the exact converse... what is it happening this way.?
Answer» If total internal reflection takes place only when light ray moves from optical denser to optical rarer... But during rainbow formation total internal reflection takes place when light enters from air to a water drop that is from rarer medium to denser medium which is the exact converse... what is it happening this way.?

Discussion

20.	We know that atoms can neither be created nor destroyed. Then how is it possible that atoms were formed after about 400,000 years of the birth of universe?
Answer» We know that atoms can neither be created nor destroyed. Then how is it possible that atoms were formed after about 400,000 years of the birth of universe?

Discussion

21.	Give reason for the following : (i) Infrared radiations are used for photography in fog. (ii) Infrared radiations are used for signals during the war. (iii) The photographic darkrooms are provided with the infrared lamps. (iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum. (v) A quartz prism is required for obtaining the spectrum of the ultraviolet light. (vi) Ultraviolet bulbs have a quartz envelope instead of glass.
Answer» Give reason for the following : (i) Infrared radiations are used for photography in fog. (ii) Infrared radiations are used for signals during the war. (iii) The photographic darkrooms are provided with the infrared lamps. (iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum. (v) A quartz prism is required for obtaining the spectrum of the ultraviolet light. (vi) Ultraviolet bulbs have a quartz envelope instead of glass.

21.

Give reason for the following : (i) Infrared radiations are used for photography in fog. (ii) Infrared radiations are used for signals during the war. (iii) The photographic darkrooms are provided with the infrared lamps. (iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum. (v) A quartz prism is required for obtaining the spectrum of the ultraviolet light. (vi) Ultraviolet bulbs have a quartz envelope instead of glass.

Answer»

Give reason for the following :

(i) Infrared radiations are used for photography in fog.

(ii) Infrared radiations are used for signals during the war.

(iii) The photographic darkrooms are provided with the infrared lamps.

(iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

(v) A quartz prism is required for obtaining the spectrum of the ultraviolet light.

(vi) Ultraviolet bulbs have a quartz envelope instead of glass.

Discussion

22.	Micro-organism responsible for decomposition during biogas preparation are
Answer» Micro-organism responsible for decomposition during biogas preparation are

Discussion

23.	Name the material used as i) Fuse Wire ii) Connecting Wires
Answer» Name the material used as i) Fuse Wire ii) Connecting Wires

23.

Name the material used as i) Fuse Wire ii) Connecting Wires

Answer»

Name the material used as

i) Fuse Wire

ii) Connecting Wires

Discussion

24.	0.5 kg of lemon squash at 30∘C is placed in a refrigerator which can remove heat at an average rate of 30 J s−1.How long will it take to cool the lemon squash to 5∘C? Specific heat capacity of squash=4200 J kg−1 K−1.
Answer» 0.5 kg of lemon squash at $30^{\circ} C$ is placed in a refrigerator which can remove heat at an average rate of 30 J $s^{- 1}$ .How long will it take to cool the lemon squash to $5^{\circ} C$ ? Specific heat capacity of squash=4200 J k $g^{- 1} K^{- 1}$ .

Discussion

25.	The work done in moving a charge of 5 C across the potential difference of 13 V is
Answer» The work done in moving a charge of 5 C across the potential difference of 13 V is

Discussion

26.	When light strikes the surface of a non-metallic material it bounces off in all directions due to ___
Answer» When light strikes the surface of a non-metallic material it bounces off in all directions due to ___

Discussion

27.	How is thermal capacity of body related to the specific heat capacity of the body?
Answer» How is thermal capacity of body related to the specific heat capacity of the body?

Discussion

28.	A force produces an acceleration of 5.0m/s2 when it acts on a body of mass 2 kg for 2 seconds. Find the work done by the force.
Answer» A force produces an acceleration of $5.0 m / s^{2}$ when it acts on a body of mass 2 kg for 2 seconds. Find the work done by the force.

Discussion

29.	In the simple electric motor of figure gives below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil. Is the current flowing clockwise or anticlockwise around the coil when viewed from above ?
Answer» In the simple electric motor of figure gives below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil. Is the current flowing clockwise or anticlockwise around the coil when viewed from above ?

29.

In the simple electric motor of figure gives below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil. Is the current flowing clockwise or anticlockwise around the coil when viewed from above ?

Answer»

In the simple electric motor of figure gives below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil.

Is the current flowing clockwise or anticlockwise around the coil when viewed from above ?

Discussion

30.	One horse power is equal to : (a) 1000 W (b) 500 W. (c) 764 W (d) 746 W.
Answer» One horse power is equal to : (a) 1000 W (b) 500 W. (c) 764 W (d) 746 W.

30.

One horse power is equal to : (a) 1000 W (b) 500 W. (c) 764 W (d) 746 W.

Answer»

One horse power is equal to :

(a) 1000 W (b) 500 W.

(c) 764 W (d) 746 W.

Discussion

31.	Let's say a laboratory room has very strong magnetic field upwards i.e. towards the ceiling. An electron gun is fired along a line from one of the vertical walls to the opposite wall. Then, It will-
Answer» Let's say a laboratory room has very strong magnetic field upwards i.e. towards the ceiling. An electron gun is fired along a line from one of the vertical walls to the opposite wall. Then, It will-

Discussion

32.	Calculate the angular velocity of the following arms of the clock in rad/sec.
Answer» Calculate the angular velocity of the following arms of the clock in rad/sec.

Discussion

33.	Which of the following is true regarding centrifugal force?
Answer» Which of the following is true regarding centrifugal force?

Discussion

34.	Explain Fleming's left-hand rule.
Answer» Explain Fleming's left-hand rule.

Discussion

35.	The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is
Answer» The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is

35.

The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is

Answer»

The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is

Discussion

36.	For a right angled prism, a ray is to be incident on a non-hypotenuse side such that a deviation of is to be achieved. What should be the angle of incidence (In Degrees) if the refractive index of the prism is 1.4 ?
Answer» For a right angled prism, a ray is to be incident on a non-hypotenuse side such that a deviation of is to be achieved. What should be the angle of incidence (In Degrees) if the refractive index of the prism is 1.4 ?

Discussion

37.	The power of lens is +0.4d. Calculate its focal length in cm. What is the lens type?
Answer» The power of lens is +0.4d. Calculate its focal length in cm. What is the lens type?

Discussion

38.	Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.
Answer» Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.

Discussion

39.	Find the work done for the force-displacement plot shown below.
Answer» Find the work done for the force-displacement plot shown below.

Discussion

40.	50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then the rise in its temperature is (specific heat of copper =420J/kg/∘C)5
Answer» $50 g$ of copper is heated to increase its temperature by $10^{\circ} C$ . If the same quantity of heat is given to $10 g$ of water, then the rise in its temperature is (specific heat of copper $= 420 J / k g /^{\circ} C$ ) 5

Discussion

41.	Which kind of mirror is used a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?
Answer» Which kind of mirror is used a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?

Discussion

42.	A ball is placed in a trough as shown. This can be categorised as :
Answer» A ball is placed in a trough as shown. This can be categorised as :

Discussion

43.	The arrangement for converting AC into continous unidirectional current is called:
Answer» The arrangement for converting AC into continous unidirectional current is called:

Discussion

44.	If lens I has focal length +15 cm and lens II has focal length + 30 cm, find out which lens has more power?
Answer» If lens I has focal length +15 cm and lens II has focal length + 30 cm, find out which lens has more power?

Discussion

45.	Which impurity is doped in Si to form N-type semi-conductor?
Answer» Which impurity is doped in Si to form N-type semi-conductor?

Discussion

46.	Define incident ray?
Answer» Define incident ray?

Discussion

47.	Study the following four experimental set-ups I, II, III and IV for the experiment. "To trace the path of a ray of light through a rectangular glass slab." Choose the correct answer.
Answer» Study the following four experimental set-ups I, II, III and IV for the experiment. "To trace the path of a ray of light through a rectangular glass slab." Choose the correct answer.

Discussion

48.	The diagram below shows the arrangement of five different resistances connected to a battery of e.m.f. 1.8 V. Calculate: (a) the total resistance fo the circuit, and (b) the reading of ammeter A.
Answer» The diagram below shows the arrangement of five different resistances connected to a battery of e.m.f. 1.8 V. Calculate: (a) the total resistance fo the circuit, and (b) the reading of ammeter A.

Discussion

49.	(a) Name the lens which always forms an erect and virtual image. (b) State whether the image in part (a) is magnified or diminished.
Answer» (a) Name the lens which always forms an erect and virtual image. (b) State whether the image in part (a) is magnified or diminished.

49.

(a) Name the lens which always forms an erect and virtual image. (b) State whether the image in part (a) is magnified or diminished.

Answer»

(a) Name the lens which always forms an erect and virtual image.

(b) State whether the image in part (a) is magnified or diminished.

Discussion

50.	A P-type semiconductor can be obtained by adding
Answer» A P-type semiconductor can be obtained by adding

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Question 7 List three sources of magnetic fields.

White light is considered to be

Three bulbs 40w, 60 w and 100 w are connected to 220 v mains. Which bulb will glow brightly, if they are connected in series.

Explain how an opaque object can be made translucent and what are hot and cold sources of light?

Which of the following points can be attributed as a reason for deviation of apparent position of a star from its actual position?

When magnetic field lines are closer, the magnetic field is ___.

Heat energy dissipated across a conductor carrying current I, having resistance R for a time t, is given by:

An object is placed at a distance of one and a half of the focal length of a concave mirror. Find the position of image in terms of 'f'. Also find the magnification and nature of image formed by a concave mirror.

The best conductor of electricity among the following is:

With the help of a diagram of experimental setup describe an activity to show that the force acting on a current carrying conductor placed in a uniform magnetic field increases with increase in the field strength.

The electrode connected to negative terminal of a battery is called___.

Heat and temperature can be respectively defined as

Various components of a step-down transformer are

Name the liquid metal that CFL bulbs contain which is detrimental to environment.

Solar energy is an inexhaustible natural resource because:

Discuss the law of conservation of momentum.

What is degraded energy?

We know that atoms can neither be created nor destroyed. Then how is it possible that atoms were formed after about 400,000 years of the birth of universe?

Micro-organism responsible for decomposition during biogas preparation are

Name the material used as i) Fuse Wire ii) Connecting Wires

0.5 kg of lemon squash at 30∘C is placed in a refrigerator which can remove heat at an average rate of 30 J s−1.How long will it take to cool the lemon squash to 5∘C? Specific heat capacity of squash=4200 J kg−1 K−1.

The work done in moving a charge of 5 C across the potential difference of 13 V is

When light strikes the surface of a non-metallic material it bounces off in all directions due to ___

How is thermal capacity of body related to the specific heat capacity of the body?

A force produces an acceleration of 5.0m/s2 when it acts on a body of mass 2 kg for 2 seconds. Find the work done by the force.

In the simple electric motor of figure gives below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil. Is the current flowing clockwise or anticlockwise around the coil when viewed from above ?

One horse power is equal to : (a) 1000 W (b) 500 W. (c) 764 W (d) 746 W.

Let's say a laboratory room has very strong magnetic field upwards i.e. towards the ceiling. An electron gun is fired along a line from one of the vertical walls to the opposite wall. Then, It will-

Calculate the angular velocity of the following arms of the clock in rad/sec.

Which of the following is true regarding centrifugal force?

Explain Fleming's left-hand rule.

The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is

For a right angled prism, a ray is to be incident on a non-hypotenuse side such that a deviation of is to be achieved. What should be the angle of incidence (In Degrees) if the refractive index of the prism is 1.4 ?

The power of lens is +0.4d. Calculate its focal length in cm. What is the lens type?

Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.

Find the work done for the force-displacement plot shown below.

50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then the rise in its temperature is (specific heat of copper =420J/kg/∘C)5

Which kind of mirror is used a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?

A ball is placed in a trough as shown. This can be categorised as :

The arrangement for converting AC into continous unidirectional current is called:

If lens I has focal length +15 cm and lens II has focal length + 30 cm, find out which lens has more power?

Which impurity is doped in Si to form N-type semi-conductor?

Define incident ray?

Study the following four experimental set-ups I, II, III and IV for the experiment. "To trace the path of a ray of light through a rectangular glass slab." Choose the correct answer.

The diagram below shows the arrangement of five different resistances connected to a battery of e.m.f. 1.8 V. Calculate: (a) the total resistance fo the circuit, and (b) the reading of ammeter A.

(a) Name the lens which always forms an erect and virtual image. (b) State whether the image in part (a) is magnified or diminished.

A P-type semiconductor can be obtained by adding