13232 + Interview Questions in Physics

1.	Derive kinetic energy? Give best answer. this question is for my exam.
Answer» Derive kinetic energy? Give best answer. this question is for my exam.

Discussion

2.	Question 8 Which of the following statements is true? (a) A convex lens has 4 dioptre power having a focal length 0.25 m. (b) A convex lens has -4 dioptre power having a focal length -0.25 m. (c) A concave lens has 4 dioptre power having a focal length 0.25 m. (d) A concave lens has 4 dioptre power having a focal length -0.25 m.
Answer» Question 8 Which of the following statements is true? (a) A convex lens has 4 dioptre power having a focal length 0.25 m. (b) A convex lens has -4 dioptre power having a focal length -0.25 m. (c) A concave lens has 4 dioptre power having a focal length 0.25 m. (d) A concave lens has 4 dioptre power having a focal length -0.25 m.

Discussion

3.	What is momentum in simple words ? Can you give an example and explain ?
Answer» What is momentum in simple words ? Can you give an example and explain ?

Discussion

4.	The rock has a mass of 1 kg. What is the mass of the measuring stick if it is balanced by a support force at the one-quarter mark? The centre of mass of the measuring stick is at the one-half mark, one-quarter of the stick's length beyond the pivot.
Answer» The rock has a mass of 1 kg. What is the mass of the measuring stick if it is balanced by a support force at the one-quarter mark? The centre of mass of the measuring stick is at the one-half mark, one-quarter of the stick's length beyond the pivot.

4.

The rock has a mass of 1 kg. What is the mass of the measuring stick if it is balanced by a support force at the one-quarter mark? The centre of mass of the measuring stick is at the one-half mark, one-quarter of the stick's length beyond the pivot.

Answer»

The rock has a mass of 1 kg. What is the mass of the measuring stick if it is balanced by a support force at the one-quarter mark? The centre of mass of the measuring stick is at the one-half mark, one-quarter of the stick's length beyond the pivot.

Discussion

5.	State two factors on which the potential energy of a body at a certain height above the ground depends.
Answer» State two factors on which the potential energy of a body at a certain height above the ground depends.

Discussion

6.	The dimensions of a wooden block are 2m x 0.25 m x 0.10 m. If the relative density of wood is 0.6, calculate the mass of block in kilograms.
Answer» The dimensions of a wooden block are 2m x 0.25 m x 0.10 m. If the relative density of wood is 0.6, calculate the mass of block in kilograms.

Discussion

7.	How is the kinetic energy of a moving cart affected if its velocity is reduced to 13rd of the initial velocity?
Answer» How is the kinetic energy of a moving cart affected if its velocity is reduced to $\frac{1}{3}$ rd of the initial velocity?

Discussion

8.	In a hydroelectric power plant, water falls at a rate of 1000 kg s−1 from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated. (Take g=10 ms−2)
Answer» In a hydroelectric power plant, water falls at a rate of $1000 k g s^{- 1}$ from a height of $100 m$ . Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated. (Take $g = 10 m s^{- 2}$ )

Discussion

9.	One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm-3) between the vertical arms of the U-tube manometer is h = 3 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s-2, then the pressure of the gas is about:
Answer» One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm^-3) between the vertical arms of the U-tube manometer is h = 3 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s^-2, then the pressure of the gas is about:

9.

One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm-3) between the vertical arms of the U-tube manometer is h = 3 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s-2, then the pressure of the gas is about:

Answer»

One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm^-3) between the vertical arms of the U-tube manometer is h = 3 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s^-2, then the pressure of the gas is about:

Discussion

10.	For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:
Answer» For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:

10.

For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:

Answer»

For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:

Discussion

11.	A particle moves along the quadrant of a circle of radius 4 m from point A to B.with a constant speed of 2m/s.Find displacement of the particle and the average velocity of the particle.
Answer» A particle moves along the quadrant of a circle of radius 4 m from point A to B.with a constant speed of 2m/s.Find displacement of the particle and the average velocity of the particle.

Discussion

12.	Find whether the net force is zero or not in the following situation. If no find the direction of force : A) A car drives around a circular path with constant speed. B) A person push a door to shut. C) A ball rolling on the ground comes to rest.
Answer» Find whether the net force is zero or not in the following situation. If no find the direction of force : A) A car drives around a circular path with constant speed. B) A person push a door to shut. C) A ball rolling on the ground comes to rest.

Discussion

13.	What is the difference between turning effect of force and moment of force?
Answer» What is the difference between turning effect of force and moment of force?

Discussion

14.	Two cubes of ice are the pressed hard between the palm when the pressure is released two cubes join together. Explain why
Answer» Two cubes of ice are the pressed hard between the palm when the pressure is released two cubes join together. Explain why

Discussion

15.	explain why 2 magnetic lines cannot intersect each other
Answer» explain why 2 magnetic lines cannot intersect each other

Discussion

16.	A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?
Answer» A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

Discussion

17.	A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because:
Answer» A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because:

Discussion

18.	A 30 g copper is heated at 200∘C with 2550J of energy. The specific heat of the copper will be.
Answer» A $30 g$ copper is heated at $200^{\circ} C$ with $2550 J$ of energy. The specific heat of the copper will be.

Discussion

19.	Find the total displacement from the velocity-time graph.
Answer» Find the total displacement from the velocity-time graph.

19.

Find the total displacement from the velocity-time graph.

Answer»

Find the total displacement from the velocity-time graph.

Discussion

20.	If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be.
Answer» If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be.

Discussion

21.	When a body is full immersed in a liquid, it undergoes an apparent:
Answer» When a body is full immersed in a liquid, it undergoes an apparent:

Discussion

22.	A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___.
Answer» A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___.

Discussion

23.	What is the work done in moving a charge of 0.4C across two points having a potential difference of 8V?
Answer» What is the work done in moving a charge of $0.4 C$ across two points having a potential difference of $8 V$ ?

Discussion

24.	A block of mass 1 kg travelling in a straight line with a velocity of 10 ms−1 collides and sticks to a stationary wooden block of mass 5 kg. After this, they both move together in the same straight line. Calculate the total momentum just before the impact, just after the impact and the velocity of the combined object.
Answer» A block of mass $1 k g$ travelling in a straight line with a velocity of $10 m s^{- 1}$ collides and sticks to a stationary wooden block of mass $5 k g$ . After this, they both move together in the same straight line. Calculate the total momentum just before the impact, just after the impact and the velocity of the combined object.

Discussion

25.	A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?
Answer» A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?

Discussion

26.	What is the other name of a loud-hailer?
Answer» What is the other name of a loud-hailer?

Discussion

27.	What is circular motion?
Answer» What is circular motion?

Discussion

28.	There are two mutually perpendicular forces acting on an object. One force acts in the direction of motion of the object and the direction of other force is perpendicular to the motion. During this interval, the kinetic energy of the body changes from 25 J to 100 J. The work done by the force acting perpendicular to the direction of object is:
Answer» There are two mutually perpendicular forces acting on an object. One force acts in the direction of motion of the object and the direction of other force is perpendicular to the motion. During this interval, the kinetic energy of the body changes from 25 J to 100 J. The work done by the force acting perpendicular to the direction of object is:

Discussion

29.	Why nails have pointed tip
Answer» Why nails have pointed tip

Discussion

30.	Why does acceleration due to gravity does not depend on a body
Answer» Why does acceleration due to gravity does not depend on a body

Discussion

31.	The energy spectrum of a blackbody exhibits a maximum around a wavelength λ0. The temperature of the black body is now changed such that the energy is maximum around a wavelength 3λ04 The power radiated by the blackbody will now increase by a factor:
Answer» The energy spectrum of a blackbody exhibits a maximum around a wavelength $λ_{0}$ . The temperature of the black body is now changed such that the energy is maximum around a wavelength $\frac{3 λ_{0}}{4}$ The power radiated by the blackbody will now increase by a factor:

Discussion

32.	A beaker of 5 liter is filled with a liquid. The value of the relative density is 0.8. Find the mass of the liquid. Density of water =1 g cm−3
Answer» A beaker of 5 liter is filled with a liquid. The value of the relative density is $0.8$ . Find the mass of the liquid. Density of water $= 1 g c m^{- 3}$

Discussion

33.	The__ of an object is a measure of its inertia.
Answer» The__ of an object is a measure of its inertia.

Discussion

34.	Define Inertia. Describe a simple experiment to demonstrate the inertia of rest. [5 MARKS]
Answer» Define Inertia. Describe a simple experiment to demonstrate the inertia of rest. [5 MARKS]

Discussion

35.	Is the sun moving through
Answer» Is the sun moving through

Discussion

36.	For the given graph of acceleration against time, what will be the corresponding displacement-time graph? Given that the body starts from rest.
Answer» For the given graph of acceleration against time, what will be the corresponding displacement-time graph? Given that the body starts from rest.

Discussion

37.	Calculate the gravitational force between 2 stars having mass 1025 kg and 5×1030 kg respectively. Distance between them is 2×1010m.
Answer» Calculate the gravitational force between 2 stars having mass $10^{25} k g$ and $5 \times 10^{30} k g$ respectively. Distance between them is $2 \times 10^{10} m$ .

Discussion

38.	The odd one the following: soft horns; ear plugs; silencers; loud speakers
Answer» The odd one the following: soft horns; ear plugs; silencers; loud speakers

38.

The odd one the following: soft horns; ear plugs; silencers; loud speakers

Answer»

The odd one the following: soft horns; ear plugs; silencers; loud speakers

Discussion

39.	A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.
Answer» A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.

Discussion

40.	Which of the following is never transferred in a wave?
Answer» Which of the following is never transferred in a wave?

Discussion

41.	A pendulum clock loses 12 seconds a day if the temperature is 40∘C and goes fast by 4 seconds a day if the temperature is 20∘C. Find the temperature at which the clock will show correct time, and the coefficient of linear expansion of the metal of the pendulum shaft.
Answer» A pendulum clock loses 12 seconds a day if the temperature is $40^{\circ} C$ and goes fast by 4 seconds a day if the temperature is $20^{\circ} C$ . Find the temperature at which the clock will show correct time, and the coefficient of linear expansion of the metal of the pendulum shaft.

Discussion

42.	A body starts from point A with an initial velocity of 2 ms−1 and with a constant acceleration of 52 ms−2. How much distance would it have travelled when the velocity has reached 10 ms−1?
Answer» A body starts from point A with an initial velocity of $2 m s^{- 1}$ and with a constant acceleration of $\frac{5}{2} m s^{- 2}$ . How much distance would it have travelled when the velocity has reached $10 m s^{- 1}$ ?

Discussion

43.	Ram has an LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?
Answer» Ram has an LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

Discussion

44.	Question 12 A girl is sitting in the middle of a park of dimension 12m×12m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.
Answer» Question 12 A girl is sitting in the middle of a park of dimension $12 m \times 12 m$ . On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.

Discussion

45.	The speed of sound in the vacuum is ___ .
Answer» The speed of sound in the vacuum is ___ .

Discussion

46.	After how many years does Halley's comet appear ?
Answer» After how many years does Halley's comet appear ?

Discussion

47.	A piece of ice floating in a glass of water melts, but the level of water in glass does not change. Give reason.
Answer» A piece of ice floating in a glass of water melts, but the level of water in glass does not change. Give reason.

Discussion

48.	An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?
Answer» An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?

Discussion

49.	The strength of the electromagnet can be increased by (a) reversing the directions of current (b) using an alternating current of high frequency (c) increasing the current in the coil (d) decreasing the number of turns of coil.
Answer» The strength of the electromagnet can be increased by (a) reversing the directions of current (b) using an alternating current of high frequency (c) increasing the current in the coil (d) decreasing the number of turns of coil.

49.

The strength of the electromagnet can be increased by (a) reversing the directions of current (b) using an alternating current of high frequency (c) increasing the current in the coil (d) decreasing the number of turns of coil.

Answer»

The strength of the electromagnet can be increased by

(a) reversing the directions of current

(b) using an alternating current of high frequency

(c) increasing the current in the coil

(d) decreasing the number of turns of coil.

Discussion

50.	Figure shows the Distance-Time graph of an object. Calculate the following: (i) Average speed in the first 6 s. (ii) Distance travelled at the end of 10 s. (iii) Speed at t = 2 s, and at t = 6 s [5 MARKS]
Answer» Figure shows the Distance-Time graph of an object. Calculate the following: (i) Average speed in the first 6 s. (ii) Distance travelled at the end of 10 s. (iii) Speed at t = 2 s, and at t = 6 s [5 MARKS]

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Derive kinetic energy? Give best answer. this question is for my exam.

What is momentum in simple words ? Can you give an example and explain ?

The rock has a mass of 1 kg. What is the mass of the measuring stick if it is balanced by a support force at the one-quarter mark? The centre of mass of the measuring stick is at the one-half mark, one-quarter of the stick's length beyond the pivot.

State two factors on which the potential energy of a body at a certain height above the ground depends.

The dimensions of a wooden block are 2m x 0.25 m x 0.10 m. If the relative density of wood is 0.6, calculate the mass of block in kilograms.

How is the kinetic energy of a moving cart affected if its velocity is reduced to 13rd of the initial velocity?

In a hydroelectric power plant, water falls at a rate of 1000 kg s−1 from a height of 100 m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated. (Take g=10 ms−2)

For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:

A particle moves along the quadrant of a circle of radius 4 m from point A to B.with a constant speed of 2m/s.Find displacement of the particle and the average velocity of the particle.

Find whether the net force is zero or not in the following situation. If no find the direction of force : A) A car drives around a circular path with constant speed. B) A person push a door to shut. C) A ball rolling on the ground comes to rest.

What is the difference between turning effect of force and moment of force?

Two cubes of ice are the pressed hard between the palm when the pressure is released two cubes join together. Explain why

explain why 2 magnetic lines cannot intersect each other

A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because:

A 30 g copper is heated at 200∘C with 2550J of energy. The specific heat of the copper will be.

Find the total displacement from the velocity-time graph.

If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be.

When a body is full immersed in a liquid, it undergoes an apparent:

A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___.

What is the work done in moving a charge of 0.4C across two points having a potential difference of 8V?

A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?

What is the other name of a loud-hailer?

What is circular motion?

Why nails have pointed tip

Why does acceleration due to gravity does not depend on a body

The energy spectrum of a blackbody exhibits a maximum around a wavelength λ0. The temperature of the black body is now changed such that the energy is maximum around a wavelength 3λ04 The power radiated by the blackbody will now increase by a factor:

A beaker of 5 liter is filled with a liquid. The value of the relative density is 0.8. Find the mass of the liquid. Density of water =1 g cm−3

The__ of an object is a measure of its inertia.

Define Inertia. Describe a simple experiment to demonstrate the inertia of rest. [5 MARKS]

Is the sun moving through

For the given graph of acceleration against time, what will be the corresponding displacement-time graph? Given that the body starts from rest.

Calculate the gravitational force between 2 stars having mass 1025 kg and 5×1030 kg respectively. Distance between them is 2×1010m.

The odd one the following: soft horns; ear plugs; silencers; loud speakers

A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.

Which of the following is never transferred in a wave?

A pendulum clock loses 12 seconds a day if the temperature is 40∘C and goes fast by 4 seconds a day if the temperature is 20∘C. Find the temperature at which the clock will show correct time, and the coefficient of linear expansion of the metal of the pendulum shaft.

A body starts from point A with an initial velocity of 2 ms−1 and with a constant acceleration of 52 ms−2. How much distance would it have travelled when the velocity has reached 10 ms−1?

Ram has an LED of resistance 10 Ω which will only light up if the current provided is 1A. Below 1A current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

The speed of sound in the vacuum is ___ .

After how many years does Halley's comet appear ?

A piece of ice floating in a glass of water melts, but the level of water in glass does not change. Give reason.

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?

The strength of the electromagnet can be increased by (a) reversing the directions of current (b) using an alternating current of high frequency (c) increasing the current in the coil (d) decreasing the number of turns of coil.

Figure shows the Distance-Time graph of an object. Calculate the following: (i) Average speed in the first 6 s. (ii) Distance travelled at the end of 10 s. (iii) Speed at t = 2 s, and at t = 6 s [5 MARKS]