13232 + Interview Questions in Physics Page 185 InterviewSolution

9201.	A block of mass 2kg is released from the top of a rough incline of height 2m. If the velocity of the block on the reaching the bottom is 4m/s. Then find the magnitude of work done in juoles by the frictional force on the block. G=10m/s2.
Answer» A block of mass 2kg is released from the top of a rough incline of height 2m. If the velocity of the block on the reaching the bottom is 4m/s. Then find the magnitude of work done in juoles by the frictional force on the block. G=10m/s2.

Discussion

9202.	Can the average speed of a moving body be zero? Give reason.
Answer» Can the average speed of a moving body be zero? Give reason.

Discussion

9203.	Why only Boran or cadmium rods are used to control a nuclear reaction?
Answer» Why only Boran or cadmium rods are used to control a nuclear reaction?

Discussion

9204.	The mass of a body is 70kg. When completely immersed in water , it displaces 2000cm3 of water. What is the relative density of the material of the body.
Answer» The mass of a body is 70kg. When completely immersed in water , it displaces 2000cm³ of water. What is the relative density of the material of the body.

Discussion

9205.	If the edge of a cube is doubled, the volume of the new cube will
Answer» If the edge of a cube is doubled, the volume of the new cube will

Discussion

9206.	A body of mass m and another body of mass M are at a distance d apart. Gravitational force between them is proportional to:
Answer» A body of mass $m$ and another body of mass $M$ are at a distance $d$ apart. Gravitational force between them is proportional to:

Discussion

9207.	'More the mass, more dificult it is to move the body from rest' Explain this statement by giving an example.
Answer» 'More the mass, more dificult it is to move the body from rest' Explain this statement by giving an example.

Discussion

9208.	Apple falls towards the earth but the earth does not move towards the apple because
Answer» Apple falls towards the earth but the earth does not move towards the apple because

Discussion

9209.	A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cms−1 to 15 cms−1 in 2 seconds. What is its acceleration?
Answer» A block is sliding down on an inclined plane. The velocity changes at a constant rate from $10 c m s^{- 1}$ to $15 c m s^{- 1}$ in $2$ seconds. What is its acceleration?

Discussion

9210.	What is bouyancy
Answer» What is bouyancy

Discussion

9211.	I read in various places that frequency does not change with medium. Instead, wavelength changes in different mediums due to a change in speed. I understand why speed changes with medium, but I'm not sure why wavelength changes but not frequency? . Why do the frequency of tuning fork remain same?
Answer» I read in various places that frequency does not change with medium. Instead, wavelength changes in different mediums due to a change in speed. I understand why speed changes with medium, but I'm not sure why wavelength changes but not frequency? . Why do the frequency of tuning fork remain same?

Discussion

9212.	It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = 3×108ms and Speed of sound = 340ms.
Answer» It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the height of the clouds which caused this lightning. Given, Speed of light = $3 \times 10^{8} \frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

Discussion

9213.	A boy having a mass of 50 kg will weigh on earth as ( Take g = 10 ms−2)
Answer» A boy having a mass of 50 kg will weigh on earth as ( Take g = 10 $m s^{- 2}$ )

Discussion

9214.	Is there any shortcut in gravitation chapter?
Answer» Is there any shortcut in gravitation chapter?

Discussion

9215.	The density of a body is 800 kg/m3. Will it sink or float when dipped in a bucket of water? (Density of water = 1000kg/m3).
Answer» The density of a body is $800 k g / m^{3}$ . Will it sink or float when dipped in a bucket of water? (Density of water = $1000 k g / m^{3}$ ).

Discussion

9216.	Weightlessness experienced while orbiting the earth in a spaceship is the result of –
Answer» Weightlessness experienced while orbiting the earth in a spaceship is the result of –

Discussion

9217.	Lightening is _________ on huge scale.
Answer» Lightening is _________ on huge scale.

Discussion

9218.	Two blocks of mass 4 kg and 2 kg are placed side by side on a smooth horizontal surface as shown in the figure.A horizontal force of 20 N is applied on 4 kg block.Find the acceleration of each block.
Answer» $T w o b l o c k s o f m a s s 4 k g a n d 2 k g a r e p l a c e d s i d e b y s i d e o n a s m o o t h h o r i z o n t a l s u r f a c e a s s h o w n i n t h e f i g u r e . A h o r i z o n t a l f o r c e o f 20 N i s a p p l i e d o n 4 k g b l o c k . F i n d t h e a c c e l e r a t i o n o f e a c h b l o c k .$

9218.

Two blocks of mass 4 kg and 2 kg are placed side by side on a smooth horizontal surface as shown in the figure.A horizontal force of 20 N is applied on 4 kg block.Find the acceleration of each block.

Answer»

$T w o b l o c k s o f m a s s 4 k g a n d 2 k g a r e p l a c e d s i d e b y s i d e o n a s m o o t h h o r i z o n t a l s u r f a c e a s s h o w n i n t h e f i g u r e . A h o r i z o n t a l f o r c e o f 20 N i s a p p l i e d o n 4 k g b l o c k . F i n d t h e a c c e l e r a t i o n o f e a c h b l o c k .$

Discussion

9219.	The value of g on the surface of the moon : (a) is the same as on the earth (b) is less than that on the earth (c) is more than that on the earth (d) keeps changing day by day
Answer» The value of g on the surface of the moon : (a) is the same as on the earth (b) is less than that on the earth (c) is more than that on the earth (d) keeps changing day by day

Discussion

9220.	What do you mean by change in internal energy? Please elaborate and also how it is equal to delta u
Answer» What do you mean by change in internal energy? Please elaborate and also how it is equal to delta u

Discussion

9221.	Write the mathematical form of Newton's second law of motion. State condition if any.
Answer» Write the mathematical form of Newton's second law of motion. State condition if any.

Discussion

9222.	Calculate the changing momentum of a body laying 5 kg when its velocity decreases from 20m/sec to 0.2 m/sec
Answer» Calculate the changing momentum of a body laying 5 kg when its velocity decreases from 20m/sec to 0.2 m/sec

Discussion

9223.	The nucleus of a certain atom has a mass of 3.8 x 10-25 kg and is at rest. The nucleus is radioactive and suddenly eject from itself a particle of mass 6.6 x 10-27 kg and speed 1.5 x 107 m/s. Find the recoil speed of the nucleus left behind...
Answer» The nucleus of a certain atom has a mass of 3.8 x 10^-25kg and is at rest. The nucleus is radioactive and suddenly eject from itself a particle of mass 6.6 x 10^-27 kg and speed 1.5 x 10⁷m/s. Find the recoil speed of the nucleus left behind...

Discussion

9224.	Which physical quantity change continuously during uniform circular motion
Answer» Which physical quantity change continuously during uniform circular motion

Discussion

9225.	In the laboratory, a student measures the thickness of a metal sheet using a screw gauge as shown in the figure. What is the thickness of the sheet?
Answer» In the laboratory, a student measures the thickness of a metal sheet using a screw gauge as shown in the figure. What is the thickness of the sheet?

9225.

In the laboratory, a student measures the thickness of a metal sheet using a screw gauge as shown in the figure. What is the thickness of the sheet?

Answer»

In the laboratory, a student measures the thickness of a metal sheet using a screw gauge as shown in the figure. What is the thickness of the sheet?

Discussion

9226.	Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The motorcar can be pushed by three persons to produce an acceleration of 0.2 m s 2. With what force does each person push the motorcar (Assume that all persons push the motorcar with the same muscular effort).
Answer» Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The motorcar can be pushed by three persons to produce an acceleration of 0.2 m s 2. With what force does each person push the motorcar (Assume that all persons push the motorcar with the same muscular effort).

Discussion

9227.	A bullet of mass 10 gm moving with a velocity of 400 m/sec gets embedded in a freely suspended wooden block of mass 900 gm. Calculate the velocity of wooden block acquired.
Answer» A bullet of mass 10 gm moving with a velocity of 400 m/sec gets embedded in a freely suspended wooden block of mass 900 gm. Calculate the velocity of wooden block acquired.

Discussion

9228.	Derive third equation of motion.
Answer» Derive third equation of motion.

Discussion

9229.	A water tanker filled to its half of maximum capacity moving with same velocity applies brakes suddenly. What would happen to the water level ? Why ?
Answer» A water tanker filled to its half of maximum capacity moving with same velocity applies brakes suddenly. What would happen to the water level ? Why ?

Discussion

9230.	1) Why Air conditioner is suitable in hot humid day than a desert cooler? 2) Why it is easier to sip coffee from the saucer than in a cup?
Answer» 1) Why Air conditioner is suitable in hot humid day than a desert cooler? 2) Why it is easier to sip coffee from the saucer than in a cup?

9230.

1) Why Air conditioner is suitable in hot humid day than a desert cooler? 2) Why it is easier to sip coffee from the saucer than in a cup?

Answer»

1) Why Air conditioner is suitable in hot humid day than a desert cooler?

2) Why it is easier to sip coffee from the saucer than in a cup?

Discussion

9231.	An aluminum container of mass 100 g contains 200 g of ice at −20∘C. Heat is added to the system at a rate of 100 cal s−1. Which of the following represents the variation in the temperature of the system as a function of time? Specific heat capacity of ice = 0.5 cal g−1 ∘C−1, specific heat capacity of aluminum = 0.2 cal g−1∘ C−1 and latent heat of fusion of ice = 80 cal g−1.
Answer» An aluminum container of mass 100 g contains 200 g of ice at $- 20^{\circ} C$ . Heat is added to the system at a rate of $100 c a l s^{- 1}$ . Which of the following represents the variation in the temperature of the system as a function of time? Specific heat capacity of ice = $0.5 c a l g^{- 1}$ $^{\circ}$ $C^{- 1}$ , specific heat capacity of aluminum = $0.2 c a l g^{- 1}$ $^{\circ}$ $C^{- 1}$ and latent heat of fusion of ice = $80 c a l g^{- 1}$ .

Discussion

9232.	Why ship made of iron and steel floats in water whereas a small piece of iron sinks in it. Explain.
Answer» Why ship made of iron and steel floats in water whereas a small piece of iron sinks in it. Explain.

Discussion

9233.	A body goes from P to Q with a velocity of 40 m/s and comes back from Q to P with a velocity of 60m/s. What is the average velocity of the body during the journey?
Answer» A body goes from P to Q with a velocity of 40 m/s and comes back from Q to P with a velocity of 60m/s. What is the average velocity of the body during the journey?

Discussion

9234.	Explain why some of the leaves may get detached from a tree if we vigorously shake it's branches
Answer» Explain why some of the leaves may get detached from a tree if we vigorously shake it's branches

Discussion

9235.	If in case of a motion, displacement is directly proportional to the square of time elapsed, what do you think about its (A) velocity (B) acceleration?
Answer» If in case of a motion, displacement is directly proportional to the square of time elapsed, what do you think about its (A) velocity (B) acceleration?

Discussion

9236.	An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at 20ms. Find the average speed of the image after a time interval of 2 sec?
Answer» An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at $20 \frac{m}{s}$ . Find the average speed of the image after a time interval of 2 sec?

Discussion

9237.	What is the slope of distance-time graph when object is at rest?
Answer» What is the slope of distance-time graph when object is at rest?

Discussion

9238.	The image of an object in front of a lens is larger than the object. This implies that the lens is ___.
Answer» The image of an object in front of a lens is larger than the object. This implies that the lens is ___.

Discussion

9239.	Deep pond of water has its top layer frozen during winter. State the expected temperature of water layer just in contact with ice
Answer» Deep pond of water has its top layer frozen during winter. State the expected temperature of water layer just in contact with ice

Discussion

9240.	The distance between a compression and the next rarefaction will be (Wave length = λ ):
Answer» The distance between a compression and the next rarefaction will be (Wave length = $λ$ ):

Discussion

9241.	How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill ?
Answer» How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill ?

Discussion

9242.	How long will sound take to travel in (a) an iron rail and (b) air, both 3-3 km in length ? Take speed of sound in air to be 330 m s−1 and in iron to be 5280 m s−1.
Answer» How long will sound take to travel in (a) an iron rail and (b) air, both 3-3 km in length ? Take speed of sound in air to be 330 m $s^{- 1}$ and in iron to be 5280 m $s^{- 1}$ .

Discussion

9243.	Where would sound travel faster — in wood or in water?
Answer» Where would sound travel faster — in wood or in water?

Discussion

9244.	A ball is thrown upwards with a velocity of 2 ms−1 from a height of 5 m from the ground. What will be the speed of the ball when it touches the ground? Take the acceleration due to gravity to be 10 ms−2.
Answer» A ball is thrown upwards with a velocity of $2 m s^{- 1}$ from a height of $5 m$ from the ground. What will be the speed of the ball when it touches the ground? Take the acceleration due to gravity to be $10 m s^{- 2}$ .

Discussion

9245.	There is a steel ball and rubber both of the same size. If both balls are at rest, it means that
Answer» There is a steel ball and rubber both of the same size. If both balls are at rest, it means that

Discussion

9246.	Naresh having own mass of 40kg climbs 20m along with 20kg of bagpack on his shoulders in 40s. Calculate his power and work done.
Answer» Naresh having own mass of 40kg climbs 20m along with 20kg of bagpack on his shoulders in 40s. Calculate his power and work done.

Discussion

9247.	What kind of energy is possessed by the following ? (a) A stone kept on roof-top (b) A running car. (c) Water stored in the reservoir of a dam. (d) A compressed spring. (e) A stretched rubber band.
Answer» What kind of energy is possessed by the following ? (a) A stone kept on roof-top (b) A running car. (c) Water stored in the reservoir of a dam. (d) A compressed spring. (e) A stretched rubber band.

9247.

What kind of energy is possessed by the following ? (a) A stone kept on roof-top (b) A running car. (c) Water stored in the reservoir of a dam. (d) A compressed spring. (e) A stretched rubber band.

Answer»

What kind of energy is possessed by the following ?

(a) A stone kept on roof-top

(b) A running car.

(c) Water stored in the reservoir of a dam.

(d) A compressed spring.

(e) A stretched rubber band.

Discussion

9248.	Water and oil are taken in two separate beakers, the density of water is 1000 kg/m3 and the density of oil is 1500 kg/m3. At what depth, the pressure in oil beaker will be the same as the pressure at 150 cm depth, in the water beaker ?
Answer» Water and oil are taken in two separate beakers, the density of water is 1000 kg/m $^{3}$ and the density of oil is 1500 kg/m $^{3}$ . At what depth, the pressure in oil beaker will be the same as the pressure at 150 cm depth, in the water beaker ?

Discussion

9249.	The speedometer of vehicles measures______.
Answer» The speedometer of vehicles measures______.

Discussion

9250.	A 1000kg vehicle moving at speed of 10m/s is brought to rest in a distamce of 50 m by the application of brakes Calculate its acceleration And forcd acting on vehi le
Answer» A 1000kg vehicle moving at speed of 10m/s is brought to rest in a distamce of 50 m by the application of brakes Calculate its acceleration And forcd acting on vehi le

Discussion

Explore topic-wise InterviewSolutions in .

A block of mass 2kg is released from the top of a rough incline of height 2m. If the velocity of the block on the reaching the bottom is 4m/s. Then find the magnitude of work done in juoles by the frictional force on the block. G=10m/s2.

Can the average speed of a moving body be zero? Give reason.

Why only Boran or cadmium rods are used to control a nuclear reaction?

The mass of a body is 70kg. When completely immersed in water , it displaces 2000cm3 of water. What is the relative density of the material of the body.

If the edge of a cube is doubled, the volume of the new cube will

A body of mass m and another body of mass M are at a distance d apart. Gravitational force between them is proportional to:

'More the mass, more dificult it is to move the body from rest' Explain this statement by giving an example.

Apple falls towards the earth but the earth does not move towards the apple because

A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cms−1 to 15 cms−1 in 2 seconds. What is its acceleration?

What is bouyancy

I read in various places that frequency does not change with medium. Instead, wavelength changes in different mediums due to a change in speed. I understand why speed changes with medium, but I'm not sure why wavelength changes but not frequency? . Why do the frequency of tuning fork remain same?

A boy having a mass of 50 kg will weigh on earth as ( Take g = 10 ms−2)

Is there any shortcut in gravitation chapter?

The density of a body is 800 kg/m3. Will it sink or float when dipped in a bucket of water? (Density of water = 1000kg/m3).

Weightlessness experienced while orbiting the earth in a spaceship is the result of –

Lightening is _________ on huge scale.

Two blocks of mass 4 kg and 2 kg are placed side by side on a smooth horizontal surface as shown in the figure.A horizontal force of 20 N is applied on 4 kg block.Find the acceleration of each block.

The value of g on the surface of the moon : (a) is the same as on the earth (b) is less than that on the earth (c) is more than that on the earth (d) keeps changing day by day

What do you mean by change in internal energy? Please elaborate and also how it is equal to delta u

Write the mathematical form of Newton's second law of motion. State condition if any.

Calculate the changing momentum of a body laying 5 kg when its velocity decreases from 20m/sec to 0.2 m/sec

The nucleus of a certain atom has a mass of 3.8 x 10-25 kg and is at rest. The nucleus is radioactive and suddenly eject from itself a particle of mass 6.6 x 10-27 kg and speed 1.5 x 107 m/s. Find the recoil speed of the nucleus left behind...

Which physical quantity change continuously during uniform circular motion

In the laboratory, a student measures the thickness of a metal sheet using a screw gauge as shown in the figure. What is the thickness of the sheet?

A bullet of mass 10 gm moving with a velocity of 400 m/sec gets embedded in a freely suspended wooden block of mass 900 gm. Calculate the velocity of wooden block acquired.

Derive third equation of motion.

A water tanker filled to its half of maximum capacity moving with same velocity applies brakes suddenly. What would happen to the water level ? Why ?

1) Why Air conditioner is suitable in hot humid day than a desert cooler? 2) Why it is easier to sip coffee from the saucer than in a cup?

Why ship made of iron and steel floats in water whereas a small piece of iron sinks in it. Explain.

A body goes from P to Q with a velocity of 40 m/s and comes back from Q to P with a velocity of 60m/s. What is the average velocity of the body during the journey?

Explain why some of the leaves may get detached from a tree if we vigorously shake it's branches

If in case of a motion, displacement is directly proportional to the square of time elapsed, what do you think about its (A) velocity (B) acceleration?

An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at 20ms. Find the average speed of the image after a time interval of 2 sec?

What is the slope of distance-time graph when object is at rest?

The image of an object in front of a lens is larger than the object. This implies that the lens is ___.

Deep pond of water has its top layer frozen during winter. State the expected temperature of water layer just in contact with ice

The distance between a compression and the next rarefaction will be (Wave length = λ ):

How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill ?

How long will sound take to travel in (a) an iron rail and (b) air, both 3-3 km in length ? Take speed of sound in air to be 330 m s−1 and in iron to be 5280 m s−1.

Where would sound travel faster — in wood or in water?

A ball is thrown upwards with a velocity of 2 ms−1 from a height of 5 m from the ground. What will be the speed of the ball when it touches the ground? Take the acceleration due to gravity to be 10 ms−2.

There is a steel ball and rubber both of the same size. If both balls are at rest, it means that

Naresh having own mass of 40kg climbs 20m along with 20kg of bagpack on his shoulders in 40s. Calculate his power and work done.

What kind of energy is possessed by the following ? (a) A stone kept on roof-top (b) A running car. (c) Water stored in the reservoir of a dam. (d) A compressed spring. (e) A stretched rubber band.

Water and oil are taken in two separate beakers, the density of water is 1000 kg/m3 and the density of oil is 1500 kg/m3. At what depth, the pressure in oil beaker will be the same as the pressure at 150 cm depth, in the water beaker ?

The speedometer of vehicles measures______.

A 1000kg vehicle moving at speed of 10m/s is brought to rest in a distamce of 50 m by the application of brakes Calculate its acceleration And forcd acting on vehi le