16569 + Interview Questions in Physics

1.	The centre of gravity of a uniform ring is situated at
Answer» The centre of gravity of a uniform ring is situated at

Discussion

2.	The potential difference of a circuit is doubled. By what factor does the power change in the circuit?
Answer» The potential difference of a circuit is doubled. By what factor does the power change in the circuit?

Discussion

3.	Which part of eye controls the amount of light entering our eye? Iris or Pupil
Answer» Which part of eye controls the amount of light entering our eye? Iris or Pupil

Discussion

4.	An object is placed 18 cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror then calculate its focal length. Is the mirror concave or convex. What is the nature of the image. What is the radius of curvature?
Answer» An object is placed 18 cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror then calculate its focal length. Is the mirror concave or convex. What is the nature of the image. What is the radius of curvature?

Discussion

5.	What is ionisation energy ?
Answer» What is ionisation energy ?

Discussion

6.	Derive the relation between kinetic energy and momentum?
Answer» Derive the relation between kinetic energy and momentum?

Discussion

7.	Which of the following solution will conduct electricity?
Answer» Which of the following solution will conduct electricity?

Discussion

8.	The twinkling of stars is due to atmospheric : (a) reflection of light (b) dispersion of light (c) interference of light (d) refraction of light
Answer» The twinkling of stars is due to atmospheric : (a) reflection of light (b) dispersion of light (c) interference of light (d) refraction of light

Discussion

9.	What are the two kinds of natural resources?
Answer» What are the two kinds of natural resources?

Discussion

10.	(a) State Fleming's left hand rule. (b) Write the principle of working of an electric motor. (c) Explain the function of following parts of an electric motor : (i) Armature (ii) Brushes (iii) Split ring.
Answer» (a) State Fleming's left hand rule. (b) Write the principle of working of an electric motor. (c) Explain the function of following parts of an electric motor : (i) Armature (ii) Brushes (iii) Split ring.

Discussion

11.	What happens when a ray of light falls normally on the surface of a mirror?
Answer» What happens when a ray of light falls normally on the surface of a mirror?

Discussion

12.	(a) What name is given to a cylindrical coil of diameter less than its length ? (b) If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained ? (c) Give one use of the device mentioned in part (b).
Answer» (a) What name is given to a cylindrical coil of diameter less than its length ? (b) If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained ? (c) Give one use of the device mentioned in part (b).

Discussion

13.	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
Answer» 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

13.

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

Answer»

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

Discussion

14.	The V-I Graph for a series combination and for a parallel combination of two resistance is shown in the figure. Which of the two, A or B, represents the parallel combination? Give a reason for your answer.
Answer» The V-I Graph for a series combination and for a parallel combination of two resistance is shown in the figure. Which of the two, A or B, represents the parallel combination? Give a reason for your answer.

Discussion

15.	Ferric hydroxide sol is positively charged colloid. The coagulating power of ions would be in the order
Answer» Ferric hydroxide sol is positively charged colloid. The coagulating power of ions would be in the order

15.

Ferric hydroxide sol is positively charged colloid. The coagulating power of ions would be in the order

Answer»

Ferric hydroxide sol is positively charged colloid. The coagulating power of

ions would be in the order

Discussion

16.	What will happen to a compass needle when the compass is placed below a wire with needle parallel to it and a current is made to flow through the wire ? Give a reason to justify your answer.
Answer» What will happen to a compass needle when the compass is placed below a wire with needle parallel to it and a current is made to flow through the wire ? Give a reason to justify your answer.

Discussion

17.	Which of the following process is the final step in the production of electricity?
Answer» Which of the following process is the final step in the production of electricity?

Discussion

18.	What kind of lens can form : (a) an inverted magnified image ? (b) an erect magnified image ? (c) an inverted diminished image ? (d) an erect diminished image ?
Answer» What kind of lens can form : (a) an inverted magnified image ? (b) an erect magnified image ? (c) an inverted diminished image ? (d) an erect diminished image ?

Discussion

19.	A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below: When the trolley is released, it is found to move at a speed of 2 ms-1. What potential energy did the spring possess when compressed?
Answer» A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below: When the trolley is released, it is found to move at a speed of 2 ms^-1. What potential energy did the spring possess when compressed?

19.

A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below: When the trolley is released, it is found to move at a speed of 2 ms-1. What potential energy did the spring possess when compressed?

Answer»

A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below:

When the trolley is released, it is found to move at a speed of 2 ms^-1. What potential energy did the spring possess when compressed?

Discussion

20.	A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?
Answer» A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?

20.

A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?

Answer»

A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?

Discussion

21.	An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate : (a) the power of the kettle. (b) the energy transferred in 1 minute.
Answer» An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate : (a) the power of the kettle. (b) the energy transferred in 1 minute.

21.

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate : (a) the power of the kettle. (b) the energy transferred in 1 minute.

Answer»

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate :

(a) the power of the kettle.

(b) the energy transferred in 1 minute.

Discussion

22.	If the number of turns of a circular current carrying coil is doubled, then how will the magnetic field produced by it changes?
Answer» If the number of turns of a circular current carrying coil is doubled, then how will the magnetic field produced by it changes?

Discussion

23.	What is meant by electrical resistance? State how resistance of a conductor is affected when (I) a low current passes through it for a short duration (ii) a heavy current passes through it for about 30 seconds
Answer» What is meant by electrical resistance? State how resistance of a conductor is affected when (I) a low current passes through it for a short duration (ii) a heavy current passes through it for about 30 seconds

Discussion

24.	How many MeV are equivalent to 1 atomic mass unit (u)?
Answer» How many MeV are equivalent to 1 atomic mass unit (u)?

Discussion

25.	State two ways in which the energy of sea-waves can be harnessed.
Answer» State two ways in which the energy of sea-waves can be harnessed.

Discussion

26.	Which one of the following explains light both as a stream of particles and as wave motion
Answer» Which one of the following explains light both as a stream of particles and as wave motion

26.

Which one of the following explains light both as a stream of particles and as wave motion

Answer»

Which one of the following explains light both as a stream of particles and as wave motion

Discussion

27.	Identify the figure of speech in the sentences. This is excellent news! It is music to my ears.
Answer» Identify the figure of speech in the sentences. This is excellent news! It is music to my ears.

27.

Identify the figure of speech in the sentences. This is excellent news! It is music to my ears.

Answer»

Identify the figure of speech in the sentences.
This is excellent news! It is music to my ears.

Discussion

28.	You must have seen many advertisements about conservation of water. We know that 34th of earth's surface is filled with water. That is a huge amount of water. Then why should we conserve water? [3 MARKS]
Answer» You must have seen many advertisements about conservation of water. We know that $\frac{3}{4}$ th of earth's surface is filled with water. That is a huge amount of water. Then why should we conserve water? [3 MARKS]

Discussion

29.	A dark old room was closed for a long time. Once the curtains were removed slightly, the sunlight entered the room and its complete path was illuminated. What is this effect termed as?
Answer» A dark old room was closed for a long time. Once the curtains were removed slightly, the sunlight entered the room and its complete path was illuminated. What is this effect termed as?

Discussion

30.	What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm ?
Answer» What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm ?

Discussion

31.	An electric motor of power 2 kW is to be operated at mains of 220 V. Find the current rating of the fuse to be connected to the motor.
Answer» An electric motor of power $2 k W$ is to be operated at mains of $220 V$ . Find the current rating of the fuse to be connected to the motor.

Discussion

32.	AB is incident wave front on mirror R and mirror S whereas PQ and P′Q′ is reflected wave front from mirror R and mirror S respectively. Choose the correct statement
Answer» AB is incident wave front on mirror R and mirror S whereas PQ and $P^{^{'}} Q^{^{'}}$ is reflected wave front from mirror R and mirror S respectively. Choose the correct statement

Discussion

33.	47. Electric power is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ quantity (A) Vector (B) Scalar (C) Can’t be determined (D) None of these
Answer» 47. Electric power is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ quantity (A) Vector (B) Scalar (C) Can’t be determined (D) None of these

Discussion

34.	For a heater rated at 4 kW and 220 V, calculate : (a) the current, (b) the resistance of the heater, (c) the energy consumed in 2 hours, and (d) the cost if 1 kWh is priced at Rs 4.60.
Answer» For a heater rated at 4 kW and 220 V, calculate : (a) the current, (b) the resistance of the heater, (c) the energy consumed in 2 hours, and (d) the cost if 1 kWh is priced at Rs 4.60.

34.

For a heater rated at 4 kW and 220 V, calculate : (a) the current, (b) the resistance of the heater, (c) the energy consumed in 2 hours, and (d) the cost if 1 kWh is priced at Rs 4.60.

Answer»

For a heater rated at 4 kW and 220 V, calculate :

(a) the current,

(b) the resistance of the heater,

(c) the energy consumed in 2 hours, and

(d) the cost if 1 kWh is priced at Rs 4.60.

Discussion

35.	(a) State the advantages of constructing dams across the rivers? (b) Describe some of the problems associated with the construction of dams.
Answer» (a) State the advantages of constructing dams across the rivers? (b) Describe some of the problems associated with the construction of dams.

Discussion

36.	A particle of mass m is projected with velocity v making an angle of 45∘ with the horizontal. Themagnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)
Answer» A particle of mass m is projected with velocity v making an angle of $45^{\circ}$ with the horizontal. Themagnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)

Discussion

37.	What would be the refractive index of the liquid in the given figure?
Answer» What would be the refractive index of the liquid in the given figure?

Discussion

38.	The circuit has two oppositely connect ideal diodes in parallel. What is the current following in the circuit?
Answer» The circuit has two oppositely connect ideal diodes in parallel. What is the current following in the circuit?

Discussion

39.	A radioactive element AZX loses two successive β−particles and an α−particles such that resulting nuclide is PQY. Find the values of P and Q in terms of A and Z. [5 MARKS]
Answer» A radioactive element $_{Z}^{A} X$ loses two successive $β - p a r t i c l e s$ and an $α - p a r t i c l e s$ such that resulting nuclide is $_{Q}^{P} Y$ . Find the values of P and Q in terms of A and Z. [5 MARKS]

Discussion

40.	Why do the farmers fill their fields with water on a cold winter night?
Answer» Why do the farmers fill their fields with water on a cold winter night?

Discussion

41.	A thin lens has a focal length −25 cm. Calculate the power of lens in dioptre.-4
Answer» A thin lens has a focal length $- 25 c m$ . Calculate the power of lens in dioptre. -4

Discussion

42.	A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is
Answer» A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of $90^{\circ}$ with each other. The angles of reflection and refraction are r and r'. The critical angle is

Discussion

43.	Which of the following is/are not correct about physical adsorption i) It is reversible ii) It involves the formation of multilayers iii) Heat of adsorption is usually low iv) It is highly specific
Answer» Which of the following is/are not correct about physical adsorption i) It is reversible ii) It involves the formation of multilayers iii) Heat of adsorption is usually low iv) It is highly specific

43.

Which of the following is/are not correct about physical adsorption i) It is reversible ii) It involves the formation of multilayers iii) Heat of adsorption is usually low iv) It is highly specific

Answer»

Which of the following is/are not correct about physical adsorption

i) It is reversible

ii) It involves the formation of multilayers

iii) Heat of adsorption is usually low

iv) It is highly specific

Discussion

44.	Explain the applications of Faraday's law of induction?
Answer» Explain the applications of Faraday's law of induction?

Discussion

45.	∫dx√2ax−x2 = ansin−1[xa−1] The value of n is
Answer» $\int \frac{d x}{\sqrt{2 a x - x^{2}}}$ = $a^{n} s i n^{- 1} [\frac{x}{a} - 1]$ The value of n is

45.

∫dx√2ax−x2 = ansin−1[xa−1] The value of n is

Answer»

$\int \frac{d x}{\sqrt{2 a x - x^{2}}}$ = $a^{n} s i n^{- 1} [\frac{x}{a} - 1]$

The value of n is

Discussion

46.	An atomic nucleus A is composed of 84 protons and 128 neutrons. The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a β - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?
Answer» An atomic nucleus A is composed of 84 protons and 128 neutrons. The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a $β$ - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?

46.

An atomic nucleus A is composed of 84 protons and 128 neutrons. The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a β - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?

Answer»

An atomic nucleus A is composed of 84 protons and 128 neutrons.

The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a $β$ - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?

Discussion

47.	It is given that the value of (sin i / sin r) when light enters from medium P to medium Q is less than 1.
Answer» It is given that the value of (sin i / sin r) when light enters from medium P to medium Q is less than 1.

Discussion

48.	Two resistors R1 and R2 are joined in parallel. Find the equivalent resistance. [2 MARKS]
Answer» Two resistors $R_{1}$ and $R_{2}$ are joined in parallel. Find the equivalent resistance. [2 MARKS]

Discussion

49.	A light ray passes through a thick glass slab. How many times does refraction take place?
Answer» A light ray passes through a thick glass slab. How many times does refraction take place?

Discussion

50.	A person is standing next to a current carrying wire which lies horizontally such that he is pointing in the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?
Answer» A person is standing next to a current carrying wire which lies horizontally such that he is pointing in the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The centre of gravity of a uniform ring is situated at

The potential difference of a circuit is doubled. By what factor does the power change in the circuit?

Which part of eye controls the amount of light entering our eye? Iris or Pupil

An object is placed 18 cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror then calculate its focal length. Is the mirror concave or convex. What is the nature of the image. What is the radius of curvature?

What is ionisation energy ?

Derive the relation between kinetic energy and momentum?

Which of the following solution will conduct electricity?

The twinkling of stars is due to atmospheric : (a) reflection of light (b) dispersion of light (c) interference of light (d) refraction of light

What are the two kinds of natural resources?

(a) State Fleming's left hand rule. (b) Write the principle of working of an electric motor. (c) Explain the function of following parts of an electric motor : (i) Armature (ii) Brushes (iii) Split ring.

What happens when a ray of light falls normally on the surface of a mirror?

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

The V-I Graph for a series combination and for a parallel combination of two resistance is shown in the figure. Which of the two, A or B, represents the parallel combination? Give a reason for your answer.

Ferric hydroxide sol is positively charged colloid. The coagulating power of ions would be in the order

What will happen to a compass needle when the compass is placed below a wire with needle parallel to it and a current is made to flow through the wire ? Give a reason to justify your answer.

Which of the following process is the final step in the production of electricity?

What kind of lens can form : (a) an inverted magnified image ? (b) an erect magnified image ? (c) an inverted diminished image ? (d) an erect diminished image ?

A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below: When the trolley is released, it is found to move at a speed of 2 ms-1. What potential energy did the spring possess when compressed?

A student traces the path of a ray of white light through a rectangular glass slab and marks the angles of incidence (∠i), refraction (∠r) and emergence (e) as shown. Which angle or angles have not been marked correctly?

An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate : (a) the power of the kettle. (b) the energy transferred in 1 minute.

If the number of turns of a circular current carrying coil is doubled, then how will the magnetic field produced by it changes?

What is meant by electrical resistance? State how resistance of a conductor is affected when (I) a low current passes through it for a short duration (ii) a heavy current passes through it for about 30 seconds

How many MeV are equivalent to 1 atomic mass unit (u)?

State two ways in which the energy of sea-waves can be harnessed.

Which one of the following explains light both as a stream of particles and as wave motion

Identify the figure of speech in the sentences. This is excellent news! It is music to my ears.

You must have seen many advertisements about conservation of water. We know that 34th of earth's surface is filled with water. That is a huge amount of water. Then why should we conserve water? [3 MARKS]

A dark old room was closed for a long time. Once the curtains were removed slightly, the sunlight entered the room and its complete path was illuminated. What is this effect termed as?

What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm ?

An electric motor of power 2 kW is to be operated at mains of 220 V. Find the current rating of the fuse to be connected to the motor.

AB is incident wave front on mirror R and mirror S whereas PQ and P′Q′ is reflected wave front from mirror R and mirror S respectively. Choose the correct statement

47. Electric power is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ quantity (A) Vector (B) Scalar (C) Can’t be determined (D) None of these

For a heater rated at 4 kW and 220 V, calculate : (a) the current, (b) the resistance of the heater, (c) the energy consumed in 2 hours, and (d) the cost if 1 kWh is priced at Rs 4.60.

(a) State the advantages of constructing dams across the rivers? (b) Describe some of the problems associated with the construction of dams.

A particle of mass m is projected with velocity v making an angle of 45∘ with the horizontal. Themagnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)

What would be the refractive index of the liquid in the given figure?

The circuit has two oppositely connect ideal diodes in parallel. What is the current following in the circuit?

A radioactive element AZX loses two successive β−particles and an α−particles such that resulting nuclide is PQY. Find the values of P and Q in terms of A and Z. [5 MARKS]

Why do the farmers fill their fields with water on a cold winter night?

A thin lens has a focal length −25 cm. Calculate the power of lens in dioptre.-4

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is

Which of the following is/are not correct about physical adsorption i) It is reversible ii) It involves the formation of multilayers iii) Heat of adsorption is usually low iv) It is highly specific

Explain the applications of Faraday's law of induction?

∫dx√2ax−x2 = ansin−1[xa−1] The value of n is

An atomic nucleus A is composed of 84 protons and 128 neutrons. The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a β - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?

It is given that the value of (sin i / sin r) when light enters from medium P to medium Q is less than 1.

Two resistors R1 and R2 are joined in parallel. Find the equivalent resistance. [2 MARKS]

A light ray passes through a thick glass slab. How many times does refraction take place?

A person is standing next to a current carrying wire which lies horizontally such that he is pointing in the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?