13232 + Interview Questions in Physics

1.	The measure of inertia of an object is
Answer» The measure of inertia of an object is

Discussion

2.	The average K.E. of an ideal gas in calories per mole is approximately equal to
Answer» The average K.E. of an ideal gas in calories per mole is approximately equal to

2.

The average K.E. of an ideal gas in calories per mole is approximately equal to

Answer»

The average K.E. of an ideal gas in calories per mole is approximately equal to

Discussion

3.	Which one is correct for the law of conservation of momentum?
Answer» Which one is correct for the law of conservation of momentum?

Discussion

4.	Calculate the value of acceleration due to gravity on a planet whose mass is 4 times as that of the earth and radius is 3 times as that of the earth.
Answer» Calculate the value of acceleration due to gravity on a planet whose mass is 4 times as that of the earth and radius is 3 times as that of the earth.

Discussion

5.	What are the uses of distance time graph?
Answer» What are the uses of distance time graph?

Discussion

6.	Define least count of a vernier callipers. How do you determine it ?
Answer» Define least count of a vernier callipers. How do you determine it ?

Discussion

7.	In which medium sound travels fastest : air, water or steel ?
Answer» In which medium sound travels fastest : air, water or steel ?

Discussion

8.	Define universal gravitational constant. Does the value of G change with a change in mass and distance?
Answer» Define universal gravitational constant. Does the value of G change with a change in mass and distance?

Discussion

9.	Question 3 Under which of the conditions a concave mirror can form an image larger than the actual object? (a) When the object is kept at a distance equal to its radius of curvature. (b) When object is kept at a distance less than its focal length. (c) When object is placed between the focus and centre of curvature. (d) When object is kept at a distance greater than its radius of curvature.
Answer» Question 3 Under which of the conditions a concave mirror can form an image larger than the actual object? (a) When the object is kept at a distance equal to its radius of curvature. (b) When object is kept at a distance less than its focal length. (c) When object is placed between the focus and centre of curvature. (d) When object is kept at a distance greater than its radius of curvature.

Discussion

10.	In guided, in solved examples, in engine problem, at 05:09 sir took mass as 10,000 kgs because all wagons weighed 2000 kgs but the engine didn't had to juzst pull the wagons but also to make itself move, so can we say that mass should be taken as 18,000kgs. Because my school teacher took mass as 18000 kgs and found the acceleration as 1.94444444444............. m per second square.
Answer» In guided, in solved examples, in engine problem, at 05:09 sir took mass as 10,000 kgs because all wagons weighed 2000 kgs but the engine didn't had to juzst pull the wagons but also to make itself move, so can we say that mass should be taken as 18,000kgs. Because my school teacher took mass as 18000 kgs and found the acceleration as 1.94444444444............. m per second square.

Discussion

11.	What is a nuclear reactor?
Answer» What is a nuclear reactor?

Discussion

12.	When we apply force upwards or slanting, the body or a particle displaces in a straight line?
Answer» When we apply force upwards or slanting, the body or a particle displaces in a straight line?

Discussion

13.	What happens to the density of a fluid on heating?
Answer» What happens to the density of a fluid on heating?

Discussion

14.	The mass of a man as shown by weighing spring balance is 95kg. The man steps into an elevator which is accelerating downwards with an acceleration of 3m/s^2. Find the mass of the man as shown by spring balance inside that elevator. Question 12 in the Science Workbook 9 CBSE Vol. 1
Answer» The mass of a man as shown by weighing spring balance is 95kg. The man steps into an elevator which is accelerating downwards with an acceleration of 3m/s^2. Find the mass of the man as shown by spring balance inside that elevator. Question 12 in the Science Workbook 9 CBSE Vol. 1

Discussion

15.	How are wavelength and frequency related to speed of soundwaves
Answer» How are wavelength and frequency related to speed of soundwaves

15.

How are wavelength and frequency related to speed of soundwaves

Answer»

How are wavelength and frequency related to speed of

soundwaves

Discussion

16.	Which of the following is/are the correct unit(s) of momentum?
Answer» Which of the following is/are the correct unit(s) of momentum?

Discussion

17.	The displacement-time graph for a body with non-uniform motion is a _____.
Answer» The displacement-time graph for a body with non-uniform motion is a _____.

Discussion

18.	Weight of the body on Earth is W, then weight of the same body on Moon would be.
Answer» Weight of the body on Earth is $W$ , then weight of the same body on Moon would be.

Discussion

19.	A longitudinal wave travels through a coiled spring at a speed of 4 ms−1. The distance between two consecutive compression is 20 cm. Find the frequency of the wave?
Answer» A longitudinal wave travels through a coiled spring at a speed of $4 m s^{- 1}$ . The distance between two consecutive compression is $20 c m$ . Find the frequency of the wave?

Discussion

20.	Two balls of mass 'm' each are raised to height ''h' and 2h respectively . What will be the ratio of their potential energies?
Answer» Two balls of mass 'm' each are raised to height ''h' and 2h respectively . What will be the ratio of their potential energies?

Discussion

21.	An atomic nucleus denoted by AZX emits an α−particle. Write an equation to show the formation of the daughter product. A certain radioactive nucleus emits a particle that leaves it unchanged but increases its atomic number by one. Identify the particle and write its symbol. [3 MARKS]
Answer» An atomic nucleus denoted by $_{Z}^{A} X$ emits an $α - p a r t i c l e$ . Write an equation to show the formation of the daughter product. A certain radioactive nucleus emits a particle that leaves it unchanged but increases its atomic number by one. Identify the particle and write its symbol. [3 MARKS]

Discussion

22.	The earth rotates around the sun in elliptical orbit as shown in the figure. Where is the velocity of the earth the maximum?
Answer» The earth rotates around the sun in elliptical orbit as shown in the figure. Where is the velocity of the earth the maximum?

22.

The earth rotates around the sun in elliptical orbit as shown in the figure. Where is the velocity of the earth the maximum?

Answer»

The earth rotates around the sun in elliptical orbit as shown in the figure.

Where is the velocity of the earth the maximum?

Discussion

23.	According to Newton's third law of motion, the action and reaction forces always act on:
Answer» According to Newton's third law of motion, the action and reaction forces always act on:

Discussion

24.	Volume occupied by a gas at one atmospheric pressure and 0∘ C is V ml. Its volume at 273 K will be
Answer» Volume occupied by a gas at one atmospheric pressure and 0 $^{\circ}$ C is V ml. Its volume at 273 K will be

24.

Volume occupied by a gas at one atmospheric pressure and 0∘ C is V ml. Its volume at 273 K will be

Answer»

Volume occupied by a gas at one atmospheric pressure and 0 $^{\circ}$ C is V ml. Its volume at 273 K will be

Discussion

25.	The condition for an electric charge to flow from one point to other is that the two points must have electric:
Answer» The condition for an electric charge to flow from one point to other is that the two points must have electric:

Discussion

26.	What is the net force acting on an object of mass 10 kg moving with a uniform velocity of 10 ms−1?
Answer» What is the net force acting on an object of mass $10 k g$ moving with a uniform velocity of $10 m s^{- 1}$ ?

Discussion

27.	A child drops a toy from the top of a building, it takes 1 s to reach the ground. Find the height of the building and the average speed of the toy? Take g=10ms2
Answer» A child drops a toy from the top of a building, it takes 1 s to reach the ground. Find the height of the building and the average speed of the toy? $T a k e g = 10 \frac{m}{s^{2}}$

Discussion

28.	State the quantities which possesses the following unit: kgm2/s2
Answer» State the quantities which possesses the following unit: kgm²/s²

Discussion

29.	A man weighing 100kgf carries a load of 10kgf on his head. He jumps from tower with that load. What will be the weight of load experienced by the man.
Answer» A man weighing 100kgf carries a load of 10kgf on his head. He jumps from tower with that load. What will be the weight of load experienced by the man.

Discussion

30.	If a toy fan is connected across a battery for 2 minutes and we know that a charge transfer of 120 C takes place then find out the current in the circuit for that period of time.
Answer» If a toy fan is connected across a battery for 2 minutes and we know that a charge transfer of 120 C takes place then find out the current in the circuit for that period of time.

Discussion

31.	The ultrasonic waves from a bat hit a mosquito flying at a distance 'x' and come back to the bat after 1.8 s. If the speed of the sound is 336 ms−1, calculate the distance 'x' of the prey.
Answer» The ultrasonic waves from a bat hit a mosquito flying at a distance ' $x$ ' and come back to the bat after $1.8 s$ . If the speed of the sound is $336 m s^{- 1},$ calculate the distance ' $x$ ' of the prey.

Discussion

32.	A simple pendulum completes 40 oscillations in one minute. Find its (a) frequency, (b) time period.
Answer» A simple pendulum completes 40 oscillations in one minute. Find its (a) frequency, (b) time period.

Discussion

33.	The S.I. unit of velocity is (a) km h−1 (b) m min−1 (c) km min−1 (d) m s−1
Answer» The S.I. unit of velocity is (a) $k m h^{- 1}$ (b) $m m i n^{- 1}$ (c) $k m m i n^{- 1}$ (d) $m s^{- 1}$

33.

The S.I. unit of velocity is (a) km h−1 (b) m min−1 (c) km min−1 (d) m s−1

Answer»

The S.I. unit of velocity is

(a) $k m h^{- 1}$ (b) $m m i n^{- 1}$

(c) $k m m i n^{- 1}$ (d) $m s^{- 1}$

Discussion

34.	Why do ships float whereas an iron nail sinks in water?
Answer» Why do ships float whereas an iron nail sinks in water?

Discussion

35.	When we cut the magnet then is it compulsory that it will only cut with separated North and south poles only it can't be cutted with the North north or with south south poles
Answer» When we cut the magnet then is it compulsory that it will only cut with separated North and south poles only it can't be cutted with the North north or with south south poles

Discussion

36.	The human ear is equipped to register sounds of frequencies between ___ .
Answer» The human ear is equipped to register sounds of frequencies between ___ .

Discussion

37.	If a stone is released from a height, what will happen to the acceleration?
Answer» If a stone is released from a height, what will happen to the acceleration?

Discussion

38.	If there is a convex lens which is made of a material whose optical density is less than that of air, then
Answer» If there is a convex lens which is made of a material whose optical density is less than that of air, then

Discussion

39.	How are the (i) mass, (ii) volume, and (iii) density of a metallic piece affected, if at all, with increase in temperature ?
Answer» How are the (i) mass, (ii) volume, and (iii) density of a metallic piece affected, if at all, with increase in temperature ?

Discussion

40.	500 litres of water is raised from a height 6 m to 15 m. If density of water is 1kgl−1 then the change in its potential energy is_______. (take g=10ms−2):
Answer» $500 l i t r e s$ of water is raised from a height $6 m$ to $15 m$ . If density of water is $1 k g l^{- 1}$ then the change in its potential energy is_______. (take $g = 10 m s^{- 2}$ ):

Discussion

41.	In a football match of Barcelona vs Real Madrid, Messi passed the football to Neymar but it was intercepted by Ronaldo. He felt a force of 200N but was able to stop the ball in 0.1s. Find the mass of the ball if Messi passed it with a velocity of 60m/s
Answer» In a football match of Barcelona vs Real Madrid, Messi passed the football to Neymar but it was intercepted by Ronaldo. He felt a force of 200N but was able to stop the ball in 0.1s. Find the mass of the ball if Messi passed it with a velocity of 60m/s

Discussion

42.	What is the acceleration produced in a freely falling body of mass 10 kg? (Neglect air resistance)
Answer» What is the acceleration produced in a freely falling body of mass 10 kg? (Neglect air resistance)

Discussion

43.	Define the term potential energy of a body. Name its two forms and give one example of each.
Answer» Define the term potential energy of a body. Name its two forms and give one example of each.

Discussion

44.	The time period of a simple pendulum is 2 s. What is its frequency ? What name is given to such a pendulum ?
Answer» The time period of a simple pendulum is 2 s. What is its frequency ? What name is given to such a pendulum ?

Discussion

45.	The SI unit of distance is ___ .
Answer» The SI unit of distance is ___ .

Discussion

46.	A racing bike has an uniform acceleration of 4 m/s2. What distance will it cover in 20 s after start ?
Answer» A racing bike has an uniform acceleration of 4 $m / s^{2}$ . What distance will it cover in 20 s after start ?

Discussion

47.	What is the kinetic energy of a body mass 1 kg moving with a speed of 2 m/s ?
Answer» What is the kinetic energy of a body mass 1 kg moving with a speed of 2 m/s ?

Discussion

48.	When we open a gas tap for a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?
Answer» When we open a gas tap for a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?

Discussion

49.	Why can’t nuclear energy be used directly to cook food?
Answer» Why can’t nuclear energy be used directly to cook food?

Discussion

50.	What is speed and what is it's formula?
Answer» What is speed and what is it's formula?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The measure of inertia of an object is

The average K.E. of an ideal gas in calories per mole is approximately equal to

Which one is correct for the law of conservation of momentum?

Calculate the value of acceleration due to gravity on a planet whose mass is 4 times as that of the earth and radius is 3 times as that of the earth.

What are the uses of distance time graph?

Define least count of a vernier callipers. How do you determine it ?

In which medium sound travels fastest : air, water or steel ?

Define universal gravitational constant. Does the value of G change with a change in mass and distance?

What is a nuclear reactor?

When we apply force upwards or slanting, the body or a particle displaces in a straight line?

What happens to the density of a fluid on heating?

The mass of a man as shown by weighing spring balance is 95kg. The man steps into an elevator which is accelerating downwards with an acceleration of 3m/s^2. Find the mass of the man as shown by spring balance inside that elevator. Question 12 in the Science Workbook 9 CBSE Vol. 1

How are wavelength and frequency related to speed of soundwaves

Which of the following is/are the correct unit(s) of momentum?

The displacement-time graph for a body with non-uniform motion is a _____.

Weight of the body on Earth is W, then weight of the same body on Moon would be.

A longitudinal wave travels through a coiled spring at a speed of 4 ms−1. The distance between two consecutive compression is 20 cm. Find the frequency of the wave?

Two balls of mass 'm' each are raised to height ''h' and 2h respectively . What will be the ratio of their potential energies?

An atomic nucleus denoted by AZX emits an α−particle. Write an equation to show the formation of the daughter product. A certain radioactive nucleus emits a particle that leaves it unchanged but increases its atomic number by one. Identify the particle and write its symbol. [3 MARKS]

The earth rotates around the sun in elliptical orbit as shown in the figure. Where is the velocity of the earth the maximum?

According to Newton's third law of motion, the action and reaction forces always act on:

Volume occupied by a gas at one atmospheric pressure and 0∘ C is V ml. Its volume at 273 K will be

The condition for an electric charge to flow from one point to other is that the two points must have electric:

What is the net force acting on an object of mass 10 kg moving with a uniform velocity of 10 ms−1?

A child drops a toy from the top of a building, it takes 1 s to reach the ground. Find the height of the building and the average speed of the toy? Take g=10ms2

State the quantities which possesses the following unit: kgm2/s2

A man weighing 100kgf carries a load of 10kgf on his head. He jumps from tower with that load. What will be the weight of load experienced by the man.

If a toy fan is connected across a battery for 2 minutes and we know that a charge transfer of 120 C takes place then find out the current in the circuit for that period of time.

The ultrasonic waves from a bat hit a mosquito flying at a distance 'x' and come back to the bat after 1.8 s. If the speed of the sound is 336 ms−1, calculate the distance 'x' of the prey.

A simple pendulum completes 40 oscillations in one minute. Find its (a) frequency, (b) time period.

The S.I. unit of velocity is (a) km h−1 (b) m min−1 (c) km min−1 (d) m s−1

Why do ships float whereas an iron nail sinks in water?

When we cut the magnet then is it compulsory that it will only cut with separated North and south poles only it can't be cutted with the North north or with south south poles

The human ear is equipped to register sounds of frequencies between ___ .

If a stone is released from a height, what will happen to the acceleration?

If there is a convex lens which is made of a material whose optical density is less than that of air, then

How are the (i) mass, (ii) volume, and (iii) density of a metallic piece affected, if at all, with increase in temperature ?

500 litres of water is raised from a height 6 m to 15 m. If density of water is 1kgl−1 then the change in its potential energy is_______. (take g=10ms−2):

In a football match of Barcelona vs Real Madrid, Messi passed the football to Neymar but it was intercepted by Ronaldo. He felt a force of 200N but was able to stop the ball in 0.1s. Find the mass of the ball if Messi passed it with a velocity of 60m/s

What is the acceleration produced in a freely falling body of mass 10 kg? (Neglect air resistance)

Define the term potential energy of a body. Name its two forms and give one example of each.

The time period of a simple pendulum is 2 s. What is its frequency ? What name is given to such a pendulum ?

The SI unit of distance is ___ .

A racing bike has an uniform acceleration of 4 m/s2. What distance will it cover in 20 s after start ?

What is the kinetic energy of a body mass 1 kg moving with a speed of 2 m/s ?

When we open a gas tap for a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?

Why can’t nuclear energy be used directly to cook food?

What is speed and what is it's formula?