16569 + Interview Questions in Physics

1.	1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1
Answer» 1 kg of ice at $0^{\circ} C$ is mixed with 1 kg of steam at $100^{\circ} C$ . What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = $3.36 \times 10^{5} J k g^{- 1}$ and latent heat of vaporization of water = $2.26 \times 10^{6} J k g^{- 1}$

Discussion

2.	In activity 12.6 in ncert book, Is the potential difference across point X and Y and L and M same? Why, why not?
Answer» In activity 12.6 in ncert book, Is the potential difference across point X and Y and L and M same? Why, why not?

Discussion

3.	How to identify acids and bases experimentally?
Answer» How to identify acids and bases experimentally?

Discussion

4.	What is the expression for Velocity Ratio (VR), if the velocity of effort and the velocity of the load are denoted as V1 and V2 respectively?
Answer» What is the expression for Velocity Ratio (VR), if the velocity of effort and the velocity of the load are denoted as V1 and V2 respectively?

Discussion

5.	Coal is most abundantly found fossil fuel. Explain.
Answer» Coal is most abundantly found fossil fuel. Explain.

Discussion

6.	Name one effect produced by the scattering of light by the atmosphere?
Answer» Name one effect produced by the scattering of light by the atmosphere?

Discussion

7.	Which of the following is a result of exploitation of natural resources?
Answer» Which of the following is a result of exploitation of natural resources?

Discussion

8.	Find the odd man out.
Answer» Find the odd man out.

Discussion

9.	What is meant by a non-renewable source of energy? Give two examples of non-renewable sources of energy.
Answer» What is meant by a non-renewable source of energy? Give two examples of non-renewable sources of energy.

Discussion

10.	What should the Gear Ratio be for a Gear System being used as a Speed Multiplier?
Answer» What should the Gear Ratio be for a Gear System being used as a Speed Multiplier?

Discussion

11.	What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
Answer» What is meant by a renewable source of energy? Give two examples of renewable sources of energy.

Discussion

12.	Which type of radiation is i) detected using a black bulb thermometer and ii) used to study crystal structure?
Answer» Which type of radiation is i) detected using a black bulb thermometer and ii) used to study crystal structure?

Discussion

13.	An object is placed at the following distances from a convex lens of focal length 15 cm : (a) 35 cm (b) 30 cm (c) 20 cm (d) 10 cm Which position of the object will produce : (i) a magnified real image ? (ii) a magnified virtual image ? (iii) a diminished real image ? (iv) an image of same size as the object ?
Answer» An object is placed at the following distances from a convex lens of focal length 15 cm : (a) 35 cm (b) 30 cm (c) 20 cm (d) 10 cm Which position of the object will produce : (i) a magnified real image ? (ii) a magnified virtual image ? (iii) a diminished real image ? (iv) an image of same size as the object ?

Discussion

14.	45 g of water at 50∘C in a beaker is cooled when 50 g of copper at 18∘C is added to it.The contents are stirred till a final constant temperature is reached.Calculate the final temperature.The specific heat capacity of copper is 0.39 Jg−1 K−1 and that of water is 4.2 Jg−1 K−1.State the assumption used.
Answer» 45 g of water at $50^{\circ} C$ in a beaker is cooled when 50 g of copper at $18^{\circ} C$ is added to it.The contents are stirred till a final constant temperature is reached.Calculate the final temperature.The specific heat capacity of copper is 0.39 J $g^{- 1} K^{- 1}$ and that of water is 4.2 J $g^{- 1} K^{- 1}$ .State the assumption used.

Discussion

15.	Why doesn't the law of conservation of mass hold true for nuclear reactions?
Answer» Why doesn't the law of conservation of mass hold true for nuclear reactions?

Discussion

16.	Why does a current carrying conductor behave like a magnet? What happens at the microscopic level?
Answer» Why does a current carrying conductor behave like a magnet? What happens at the microscopic level?

16.

Why does a current carrying conductor behave like a magnet? What happens at the microscopic level?

Answer»

Why does a current carrying conductor behave like a magnet?

What happens at the microscopic level?

Discussion

17.	While playing a football match, Krish collided and got entangled with Tom who was playing for opposite team and running from opposite side. The mass of Krish was 40 kg and the mass of Tom was 60 kg. If Tom was running with a velocity of 4 m/s and Krish was running with a velocity of 3 m/s, If Krish stops completely, find the velocity of tom after collision assuming other forces were negligible (in m/s). ___
Answer» While playing a football match, Krish collided and got entangled with Tom who was playing for opposite team and running from opposite side. The mass of Krish was 40 kg and the mass of Tom was 60 kg. If Tom was running with a velocity of 4 m/s and Krish was running with a velocity of 3 m/s, If Krish stops completely, find the velocity of tom after collision assuming other forces were negligible (in m/s). ___

Discussion

18.	At what distance in front of a concave mirror of focal length 10 cm, an object be placed so that it's real image of size five times that of the object obtained?
Answer» At what distance in front of a concave mirror of focal length 10 cm, an object be placed so that it's real image of size five times that of the object obtained?

Discussion

19.	an electric heater of resistance 8 draws 15C of charge per second. Suppose this happens for a period of 2 hours, calculate the rate at which hear is developed in the heater
Answer» an electric heater of resistance 8 draws 15C of charge per second. Suppose this happens for a period of 2 hours, calculate the rate at which hear is developed in the heater

Discussion

20.	When does a plane mirror form a real image
Answer» When does a plane mirror form a real image

Discussion

21.	Calculate the critical angle of an optical fibre without cladding if the glass has a refractive index of 1.56.
Answer» Calculate the critical angle of an optical fibre without cladding if the glass has a refractive index of 1.56.

Discussion

22.	Question 3 How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer» Question 3 How much energy is given to each coulomb of charge passing through a 6 V battery?

Discussion

23.	An observer at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be 45∘ and 60∘ respectively. Find the width of the river. Write the answer correct to the nearest whole number. [3 MARKS]
Answer» An observer at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be $45^{\circ}$ and $60^{\circ}$ respectively. Find the width of the river. Write the answer correct to the nearest whole number. [3 MARKS]

Discussion

24.	State the laws of refraction of light. If the speed of light in vacuum is 3×108ms−1, find the speed of light in a medium of absolute refractive index 1.5
Answer» State the laws of refraction of light. If the speed of light in vacuum is $3 \times 10^{8} m s^{- 1}$ , find the speed of light in a medium of absolute refractive index 1.5

Discussion

25.	Britishers in India used to focus on cultivation of indigo. For this purpose large area of forests were cleared off and indigo was grown in its place. What is the major factors getting affected by this act?
Answer» Britishers in India used to focus on cultivation of indigo. For this purpose large area of forests were cleared off and indigo was grown in its place. What is the major factors getting affected by this act?

Discussion

26.	For how long should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8A between them?
Answer» For how long should a flow of $10^{19}$ electrons be maintained between two points A and B to have a constant current of 8A between them?

Discussion

27.	What is the purpose of using an electric switch? Name some of the electrical gadgets that have switches on them. [3 MARKS]
Answer» What is the purpose of using an electric switch? Name some of the electrical gadgets that have switches on them. [3 MARKS]

Discussion

28.	How is the direction of flow of current between the two charged conductors determined by their potentials?
Answer» How is the direction of flow of current between the two charged conductors determined by their potentials?

Discussion

29.	A balloon inflates when the air is pumped into it. What conclusion which can be derived out of this observation?
Answer» A balloon inflates when the air is pumped into it. What conclusion which can be derived out of this observation?

Discussion

30.	Which particles bring about the fission of uranium-235 ?
Answer» Which particles bring about the fission of uranium-235 ?

Discussion

31.	Which non-conventional source of energy uses the energy mass equation ( E = ∆m c2 ) to generate electricity?
Answer» Which non-conventional source of energy uses the energy mass equation ( E = ∆m c² ) to generate electricity?

Discussion

32.	When a solenoid that is carrying current is freely suspended, it comes to rest along a particular direction. This happens because:
Answer» When a solenoid that is carrying current is freely suspended, it comes to rest along a particular direction. This happens because:

Discussion

33.	Give 4 examples of natural resources. [2 MARKS]
Answer» Give 4 examples of natural resources. [2 MARKS]

Discussion

34.	Magnetic force fields are produced due to:
Answer» Magnetic force fields are produced due to:

Discussion

35.	Due to geological changes,molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called as.
Answer» Due to geological changes,molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called as.

35.

Due to geological changes,molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called as.

Answer»

Due to geological changes,molten rocks formed in the deeper hot regions

of earth’s crust are pushed upward and trapped in certain regions called as.

Discussion

36.	A conductor carries a current of 0.2A. Find the amount of charge that will pass through the cross-section of the conduction in 30 s. How many electrons will flow in this time interval? (Charge on an electron, e = 1.6 × 10−19 C)
Answer» A conductor carries a current of 0.2A. Find the amount of charge that will pass through the cross-section of the conduction in 30 s. How many electrons will flow in this time interval? (Charge on an electron, e = 1.6 $\times$ $10^{- 19}$ C)

Discussion

37.	What is the device that determines position, time and path of objects on earth using satellites?
Answer» What is the device that determines position, time and path of objects on earth using satellites?

Discussion

38.	A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' & 't' have usual meanings. Find: 1. Wavelength, frequency and speed of the wave 2. Maximum velocity and maximum acceleration of the particles
Answer» A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' & 't' have usual meanings. Find: 1. Wavelength, frequency and speed of the wave 2. Maximum velocity and maximum acceleration of the particles

38.

A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' & 't' have usual meanings. Find: 1. Wavelength, frequency and speed of the wave 2. Maximum velocity and maximum acceleration of the particles

Answer»

A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' & 't' have usual meanings. Find:

1. Wavelength, frequency and speed of the wave

2. Maximum velocity and maximum acceleration of the particles

Discussion

39.	Range of vision for a normal human eye is:
Answer» Range of vision for a normal human eye is:

Discussion

40.	A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.
Answer» A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is $45^{\circ}$ and that of refraction is $30^{\circ}$ . Find the refractive index of the medium.

Discussion

41.	The most energetic electromagnetic radiations are
Answer» The most energetic electromagnetic radiations are

Discussion

42.	How is the refractive index of a medium related to the speed of light in it and in vacuum or air?
Answer» How is the refractive index of a medium related to the speed of light in it and in vacuum or air?

Discussion

43.	Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.
Answer» Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

43.

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Answer»

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Discussion

44.	Question 148(ii) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which stretching machine does the same work as two (×2) kmachines hooked together?
Answer» Question 148(ii) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which stretching machine does the same work as two $(\times 2)$ kmachines hooked together?

44.

Question 148(ii) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which stretching machine does the same work as two (×2) kmachines hooked together?

Answer»

Question 148(ii)

Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second.
Which stretching machine does the same work as two $(\times 2)$ kmachines hooked together?

Discussion

45.	A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be
Answer» A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be

45.

A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be

Answer»

A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be

Discussion

46.	A ray of light is normally incident on one face of an equilateral glass prism. Answer the following: a) What is the angle of incidence on the first face of the prism? b) What is the angle of refraction from the first face of the prism? c) What will be the angle of incidence at the second face of the prism? d) Will the light ray suffer minimum deviation by the prism? Give reason.
Answer» A ray of light is normally incident on one face of an equilateral glass prism. Answer the following: a) What is the angle of incidence on the first face of the prism? b) What is the angle of refraction from the first face of the prism? c) What will be the angle of incidence at the second face of the prism? d) Will the light ray suffer minimum deviation by the prism? Give reason.

Discussion

47.	Compare the mass and charge on an electron and a proton.
Answer» Compare the mass and charge on an electron and a proton.

Discussion

48.	Why concave mirror of small aperture forms a sharper image?
Answer» Why concave mirror of small aperture forms a sharper image?

Discussion

49.	Is a lens of power 0 D converging or diverging?
Answer» Is a lens of power 0 D converging or diverging?

Discussion

50.	What are the four colours of the spectrum of white light which have a wavelength longer than blue light?
Answer» What are the four colours of the spectrum of white light which have a wavelength longer than blue light?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1

In activity 12.6 in ncert book, Is the potential difference across point X and Y and L and M same? Why, why not?

How to identify acids and bases experimentally?

What is the expression for Velocity Ratio (VR), if the velocity of effort and the velocity of the load are denoted as V1 and V2 respectively?

Coal is most abundantly found fossil fuel. Explain.

Name one effect produced by the scattering of light by the atmosphere?

Which of the following is a result of exploitation of natural resources?

Find the odd man out.

What is meant by a non-renewable source of energy? Give two examples of non-renewable sources of energy.

What should the Gear Ratio be for a Gear System being used as a Speed Multiplier?

What is meant by a renewable source of energy? Give two examples of renewable sources of energy.

Which type of radiation is i) detected using a black bulb thermometer and ii) used to study crystal structure?

Why doesn't the law of conservation of mass hold true for nuclear reactions?

Why does a current carrying conductor behave like a magnet? What happens at the microscopic level?

At what distance in front of a concave mirror of focal length 10 cm, an object be placed so that it's real image of size five times that of the object obtained?

an electric heater of resistance 8 draws 15C of charge per second. Suppose this happens for a period of 2 hours, calculate the rate at which hear is developed in the heater

When does a plane mirror form a real image

Calculate the critical angle of an optical fibre without cladding if the glass has a refractive index of 1.56.

Question 3 How much energy is given to each coulomb of charge passing through a 6 V battery?

An observer at an altitude of 250 m observes the angle of depression of two boats on the opposite banks of a river to be 45∘ and 60∘ respectively. Find the width of the river. Write the answer correct to the nearest whole number. [3 MARKS]

State the laws of refraction of light. If the speed of light in vacuum is 3×108ms−1, find the speed of light in a medium of absolute refractive index 1.5

Britishers in India used to focus on cultivation of indigo. For this purpose large area of forests were cleared off and indigo was grown in its place. What is the major factors getting affected by this act?

For how long should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8A between them?

What is the purpose of using an electric switch? Name some of the electrical gadgets that have switches on them. [3 MARKS]

How is the direction of flow of current between the two charged conductors determined by their potentials?

A balloon inflates when the air is pumped into it. What conclusion which can be derived out of this observation?

Which particles bring about the fission of uranium-235 ?

Which non-conventional source of energy uses the energy mass equation ( E = ∆m c2 ) to generate electricity?

When a solenoid that is carrying current is freely suspended, it comes to rest along a particular direction. This happens because:

Give 4 examples of natural resources. [2 MARKS]

Magnetic force fields are produced due to:

Due to geological changes,molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called as.

A conductor carries a current of 0.2A. Find the amount of charge that will pass through the cross-section of the conduction in 30 s. How many electrons will flow in this time interval? (Charge on an electron, e = 1.6 × 10−19 C)

What is the device that determines position, time and path of objects on earth using satellites?

A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' &amp; 't' have usual meanings. Find: 1. Wavelength, frequency and speed of the wave 2. Maximum velocity and maximum acceleration of the particles

Range of vision for a normal human eye is:

A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.

The most energetic electromagnetic radiations are

How is the refractive index of a medium related to the speed of light in it and in vacuum or air?

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Question 148(ii) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which stretching machine does the same work as two (×2) kmachines hooked together?

A plane mirror as placed at the bottom of a tank containing a liquid of refractive index, μ. P is a small object at a height h above the mirror. An observer, O vertically above P and outside the liquid P and find its image in a mirror. The apparent distance between these two will be

Compare the mass and charge on an electron and a proton.

Why concave mirror of small aperture forms a sharper image?

Is a lens of power 0 D converging or diverging?

What are the four colours of the spectrum of white light which have a wavelength longer than blue light?

A sinusoidal wave propagates along a string in figure (a) and (b). 'y' represents displacement of particle from the mean position. 'x' & 't' have usual meanings. Find: 1. Wavelength, frequency and speed of the wave 2. Maximum velocity and maximum acceleration of the particles