13232 + Interview Questions in Physics Page 180 InterviewSolution

8951.	A force of 10 N acts on 5 kg for 2 seconds. The same force acts on 2.5 kg for 2 seconds. Compare the momentum produced and compare the acceleration caused? [3 MARKS]
Answer» A force of 10 N acts on 5 kg for 2 seconds. The same force acts on 2.5 kg for 2 seconds. Compare the momentum produced and compare the acceleration caused? [3 MARKS]

Discussion

8952.	Whether a solid body floats or sinks in a liquid depends only on the difference in their___.
Answer» Whether a solid body floats or sinks in a liquid depends only on the difference in their___.

Discussion

8953.	In which medium the sound travels fastest ?
Answer» In which medium the sound travels fastest ?

Discussion

8954.	A garbage cart full of garbage, is there at the top of a 2.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.25-kg can of peaches flies horizontally out of the garbage cart. The entire kinetic energy of the cart is transferred to the can and it hits a parked car with an average force of 500 N. How deep a dent is made in the car (that is over what distance the 500 N force act upon the can of peaches before bringing it to a stop)? (Neglect the effect of friction while the cart is rolling down the hill.)
Answer» A garbage cart full of garbage, is there at the top of a 2.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.25-kg can of peaches flies horizontally out of the garbage cart. The entire kinetic energy of the cart is transferred to the can and it hits a parked car with an average force of 500 N. How deep a dent is made in the car (that is over what distance the 500 N force act upon the can of peaches before bringing it to a stop)? (Neglect the effect of friction while the cart is rolling down the hill.)

8954.

A garbage cart full of garbage, is there at the top of a 2.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.25-kg can of peaches flies horizontally out of the garbage cart. The entire kinetic energy of the cart is transferred to the can and it hits a parked car with an average force of 500 N. How deep a dent is made in the car (that is over what distance the 500 N force act upon the can of peaches before bringing it to a stop)? (Neglect the effect of friction while the cart is rolling down the hill.)

Answer»

A garbage cart full of garbage, is there at the top of a 2.0-m hill. The cart begins to roll until it hits a stump at the bottom of the hill. Upon impact, a 0.25-kg can of peaches flies horizontally out of the garbage cart. The entire kinetic energy of the cart is transferred to the can and it hits a parked car with an average force of 500 N. How deep a dent is made in the car (that is over what distance the 500 N force act upon the can of peaches before bringing it to a stop)? (Neglect the effect of friction while the cart is rolling down the hill.)

Discussion

8955.	A machine has a velocity ratio of 4. It is used to raise a load of 200 N by 4 m using an effort of 20 kgf. Find the work done on the machine. Take g=10ms−2.
Answer» A machine has a velocity ratio of 4. It is used to raise a load of 200 N by 4 m using an effort of 20 kgf. Find the work done on the machine. Take $g = 10 m s^{- 2}$ .

Discussion

8956.	A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is [SCRA 1994]
Answer» A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is [SCRA 1994]

8956.

A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is [SCRA 1994]

Answer»

A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is

[SCRA 1994]

Discussion

8957.	Which of the following is/are true about the centre of gravity?
Answer» Which of the following is/are true about the centre of gravity?

Discussion

8958.	(a) Name four ways in which sound can be produced. (b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.
Answer» (a) Name four ways in which sound can be produced. (b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.

8958.

(a) Name four ways in which sound can be produced. (b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.

Answer»

(a) Name four ways in which sound can be produced.

(b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.

Discussion

8959.	In order to hear distinct echoes, the distance of the obstacle from the source of sound should be at least:
Answer» In order to hear distinct echoes, the distance of the obstacle from the source of sound should be at least:

Discussion

8960.	Q69. Encephalophone recently in news is related to:
Answer» Q69. Encephalophone recently in news is related to:

Discussion

8961.	To what signals does the ear convert pressure variations of the air, so that we are able to hear it?
Answer» To what signals does the ear convert pressure variations of the air, so that we are able to hear it?

Discussion

8962.	When we give a jerk to a tree, why don't all the leaves get detached?
Answer» When we give a jerk to a tree, why don't all the leaves get detached?

Discussion

8963.	How come kinatic energy is momentum divided by 2 mass
Answer» How come kinatic energy is momentum divided by 2 mass

Discussion

8964.	What is the primary source of energy that causes changes in weather?
Answer» What is the primary source of energy that causes changes in weather?

Discussion

8965.	What is the density of a substance of mass 100 g and volume 10cm3 ?
Answer» What is the density of a substance of mass 100 g and volume $10 c m^{3}$ ?

Discussion

8966.	A body of mass 2 kg is dropped from a building of height 5 m. The maximum kinetic energy the body can attain is: (Take g=10ms−2)
Answer» A body of mass $2 k g$ is dropped from a building of height $5 m$ . The maximum kinetic energy the body can attain is: (Take $g = 10 m s^{- 2}$ )

Discussion

8967.	When a carpet is beaten with a stick, dust comes out. Why does this happen?
Answer» When a carpet is beaten with a stick, dust comes out. Why does this happen?

Discussion

8968.	A man of mass m pulls a block with mass M with a rope. The block moves towards the right direction as shown in the figure below: The magnitude of friction is the same between the man and the ground and between the block and the ground. If T is the tension on the rope, f is the frictional force acting on the block, which of the following expression correctly depicts the force experienced by the block ?
Answer» A man of mass m pulls a block with mass M with a rope. The block moves towards the right direction as shown in the figure below: The magnitude of friction is the same between the man and the ground and between the block and the ground. If T is the tension on the rope, f is the frictional force acting on the block, which of the following expression correctly depicts the force experienced by the block ?

Discussion

8969.	Name the process of transfer of heat in mercury.
Answer» Name the process of transfer of heat in mercury.

Discussion

8970.	10 Hz is equivalent to _________.
Answer» 10 Hz is equivalent to _________.

Discussion

8971.	Which of the given statements is false?
Answer» Which of the given statements is false?

Discussion

8972.	If a person shouts near a wall and heard the echo after 10 sec.What is the distance of the wall from the person?(take speed of sound=346 m/s)
Answer» If a person shouts near a wall and heard the echo after 10 sec.What is the distance of the wall from the person?(take speed of sound=346 m/s)

Discussion

8973.	1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire 2 mm2 thick. Compare the resistance of these wires.
Answer» 1 kg piece of copper is drawn into a wire 1 mm² thick, and another 1 kg copper piece into a wire 2 mm² thick. Compare the resistance of these wires.

Discussion

8974.	___________ is a force, which always opposes the motion of one body over the other body in contact with it.
Answer» ___________ is a force, which always opposes the motion of one body over the other body in contact with it.

Discussion

8975.	Name the various parts of the human ear. [3 MARKS]
Answer» Name the various parts of the human ear. [3 MARKS]

Discussion

8976.	A train makes 3 h to travel from Agra to Delhi with a uniform speed of 65 km h−1.Find the distance between the two cities.
Answer» A train makes 3 h to travel from Agra to Delhi with a uniform speed of 65 km $h^{- 1}$ .Find the distance between the two cities.

Discussion

8977.	A bag contains a book weighing 2 kg 50 g, a box weighing 375 g and a notebook weighing 1 kg 250 g. What is the total weight of the bag?
Answer» A bag contains a book weighing 2 kg 50 g, a box weighing 375 g and a notebook weighing 1 kg 250 g. What is the total weight of the bag?

Discussion

8978.	Two bodies A and B of masses 10kg and 20kg respectively are at the same height above the ground. Which of the two has greater potential energy ?
Answer» Two bodies A and B of masses 10kg and 20kg respectively are at the same height above the ground. Which of the two has greater potential energy ?

Discussion

8979.	Explain why it is easier to stop a tennis ball in comparison to a cricket ball moving with the same speed ?
Answer» Explain why it is easier to stop a tennis ball in comparison to a cricket ball moving with the same speed ?

Discussion

8980.	Consider the following statements mentioned below: Identify the port:
Answer» Consider the following statements mentioned below: Identify the port:

8980.

Consider the following statements mentioned below: Identify the port:

Answer»

Consider the following statements mentioned below:

Identify the port:

Discussion

8981.	A car moving with initial velocity of 15 ms−1 accelerates at the rate of 4 ms−2. What is the final velocity of the car after 10 s?
Answer» A car moving with initial velocity of $15 m s^{- 1}$ accelerates at the rate of $4 m s^{- 2}$ . What is the final velocity of the car after $10 s$ ?

Discussion

8982.	If power is increased by 50 % and work done is constant, then the time taken is reduced by:
Answer» If power is increased by 50 % and work done is constant, then the time taken is reduced by:

Discussion

8983.	What is meant distance? What is the unit of distance?
Answer» What is meant distance? What is the unit of distance?

Discussion

8984.	An egg sinks in fresh water but floats in highly salty water. Give reason.
Answer» An egg sinks in fresh water but floats in highly salty water. Give reason.

Discussion

8985.	the velocity of an obeject at rest is considered to be uniform
Answer» the velocity of an obeject at rest is considered to be uniform

Discussion

8986.	There are 13 crest and 15 trough in 3 seconds. When the second crest is produced the first is 2cm away from the source. What is the wavelength
Answer» There are 13 crest and 15 trough in 3 seconds. When the second crest is produced the first is 2cm away from the source. What is the wavelength

Discussion

8987.	Why does a bullet fired from a gun make a clean hole with minimum cracking/shattering in a glass window but a stone thrown at a similar window shatters the glass? For
Answer» Why does a bullet fired from a gun make a clean hole with minimum cracking/shattering in a glass window but a stone thrown at a similar window shatters the glass? For

Discussion

8988.	A solid X which is insoluble in water, weight 180 g in the air and 150 g in water. What is the relative density of the solid X?
Answer» A solid X which is insoluble in water, weight 180 g in the air and 150 g in water. What is the relative density of the solid X?

Discussion

8989.	Action and reaction which are equal and opposite do no cancel each other because_________. Cricketer pulls his hand backward while catching a ball to decrease________.
Answer» Action and reaction which are equal and opposite do no cancel each other because_________. Cricketer pulls his hand backward while catching a ball to decrease________.

Discussion

8990.	If you divide the total distance travelled by a car trip by the time are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same? Illustrate with the help of an example.
Answer» If you divide the total distance travelled by a car trip by the time are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same? Illustrate with the help of an example.

Discussion

8991.	How to calculate tension in a string
Answer» How to calculate tension in a string

Discussion

8992.	1st law of newton say if a object in rest it remain in rest,if it is in motion it remail in motionj unless untill external force applied on it..they we my chage our state rest to motion it not apply any external force.how
Answer» 1st law of newton say if a object in rest it remain in rest,if it is in motion it remail in motionj unless untill external force applied on it..they we my chage our state rest to motion it not apply any external force.how

Discussion

8993.	Using a horizontal force of 200N a boy intends to move a cabinet across a floor with a constant velocity. What is the friction force that will be exerted on the cabinet?
Answer» Using a horizontal force of 200N a boy intends to move a cabinet across a floor with a constant velocity. What is the friction force that will be exerted on the cabinet?

Discussion

8994.	A train is moving with a velocity of 90 km h−1.It is brought to stop by applying the brakes which produce a retardation of 0.5 m s−2.Find:(i) the velocity after 10 s, and (ii) the time taken by the train to come to rest.
Answer» A train is moving with a velocity of 90 $k m h^{- 1}$ .It is brought to stop by applying the brakes which produce a retardation of 0.5 $m s^{- 2}$ .Find:(i) the velocity after 10 s, and (ii) the time taken by the train to come to rest.

Discussion

8995.	Which technique is used to determine the depth of sea and underwater sunken ships? Explain its working.
Answer» Which technique is used to determine the depth of sea and underwater sunken ships? Explain its working.

Discussion

8996.	On a horizontal frictionless surface, a block with a 4.00 kg mass in contact with a block of mass 2.00 kg, is accelerated by a +12.0 N force. Determine the force that the 2.00 kg block exerts on the 4.00 kg block.
Answer» On a horizontal frictionless surface, a block with a 4.00 kg mass in contact with a block of mass 2.00 kg, is accelerated by a +12.0 N force. Determine the force that the 2.00 kg block exerts on the 4.00 kg block.

8996.

On a horizontal frictionless surface, a block with a 4.00 kg mass in contact with a block of mass 2.00 kg, is accelerated by a +12.0 N force. Determine the force that the 2.00 kg block exerts on the 4.00 kg block.

Answer»

On a horizontal frictionless surface, a block with a 4.00 kg mass in contact with a block of mass 2.00 kg, is accelerated by a +12.0 N force. Determine the force that the 2.00 kg block exerts on the 4.00 kg block.

Discussion

8997.	Statement 1: Solar energy is a conventional form of energy. Statement 2: Solar energy is a renewable form of energy.
Answer» Statement 1: Solar energy is a conventional form of energy. Statement 2: Solar energy is a renewable form of energy.

Discussion

8998.	Why does a fire man struggle to hold a hose pipe
Answer» Why does a fire man struggle to hold a hose pipe

Discussion

8999.	Why does a ball thrown vertically upwards in a moving train, come back to the thrower's hand?
Answer» Why does a ball thrown vertically upwards in a moving train, come back to the thrower's hand?

Discussion

9000.	State the energy transformation in the following : (i) electricity is obtained from solar energy. (ii) electricity is obtained from wind energy. (iii) electricity is obtained from hydro energy. (iv) electricity is obtained from nuclear energy.
Answer» State the energy transformation in the following : (i) electricity is obtained from solar energy. (ii) electricity is obtained from wind energy. (iii) electricity is obtained from hydro energy. (iv) electricity is obtained from nuclear energy.

9000.

State the energy transformation in the following : (i) electricity is obtained from solar energy. (ii) electricity is obtained from wind energy. (iii) electricity is obtained from hydro energy. (iv) electricity is obtained from nuclear energy.

Answer»

State the energy transformation in the following :

(i) electricity is obtained from solar energy.

(ii) electricity is obtained from wind energy.

(iii) electricity is obtained from hydro energy.

(iv) electricity is obtained from nuclear energy.

Discussion

Explore topic-wise InterviewSolutions in .

A force of 10 N acts on 5 kg for 2 seconds. The same force acts on 2.5 kg for 2 seconds. Compare the momentum produced and compare the acceleration caused? [3 MARKS]

Whether a solid body floats or sinks in a liquid depends only on the difference in their___.

In which medium the sound travels fastest ?

A machine has a velocity ratio of 4. It is used to raise a load of 200 N by 4 m using an effort of 20 kgf. Find the work done on the machine. Take g=10ms−2​.

A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is [SCRA 1994]

Which of the following is/are true about the centre of gravity?

(a) Name four ways in which sound can be produced. (b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.

In order to hear distinct echoes, the distance of the obstacle from the source of sound should be at least:

Q69. Encephalophone recently in news is related to:

To what signals does the ear convert pressure variations of the air, so that we are able to hear it?

When we give a jerk to a tree, why don't all the leaves get detached?

How come kinatic energy is momentum divided by 2 mass

What is the primary source of energy that causes changes in weather?

What is the density of a substance of mass 100 g and volume 10cm3 ?

A body of mass 2 kg is dropped from a building of height 5 m. The maximum kinetic energy the body can attain is: (Take g=10ms−2)

When a carpet is beaten with a stick, dust comes out. Why does this happen?

Name the process of transfer of heat in mercury.

10 Hz is equivalent to _________.

Which of the given statements is false?

If a person shouts near a wall and heard the echo after 10 sec.What is the distance of the wall from the person?(take speed of sound=346 m/s)

1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire 2 mm2 thick. Compare the resistance of these wires.

___________ is a force, which always opposes the motion of one body over the other body in contact with it.

Name the various parts of the human ear. [3 MARKS]

A train makes 3 h to travel from Agra to Delhi with a uniform speed of 65 km h−1.Find the distance between the two cities.

A bag contains a book weighing 2 kg 50 g, a box weighing 375 g and a notebook weighing 1 kg 250 g. What is the total weight of the bag?

Two bodies A and B of masses 10kg and 20kg respectively are at the same height above the ground. Which of the two has greater potential energy ?

Explain why it is easier to stop a tennis ball in comparison to a cricket ball moving with the same speed ?

Consider the following statements mentioned below: Identify the port:

A car moving with initial velocity of 15 ms−1 accelerates at the rate of 4 ms−2. What is the final velocity of the car after 10 s?

If power is increased by 50 % and work done is constant, then the time taken is reduced by:

What is meant distance? What is the unit of distance?

An egg sinks in fresh water but floats in highly salty water. Give reason.

the velocity of an obeject at rest is considered to be uniform

There are 13 crest and 15 trough in 3 seconds. When the second crest is produced the first is 2cm away from the source. What is the wavelength

Why does a bullet fired from a gun make a clean hole with minimum cracking/shattering in a glass window but a stone thrown at a similar window shatters the glass? For

A solid X which is insoluble in water, weight 180 g in the air and 150 g in water. What is the relative density of the solid X?

Action and reaction which are equal and opposite do no cancel each other because_________. Cricketer pulls his hand backward while catching a ball to decrease________.

If you divide the total distance travelled by a car trip by the time are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same? Illustrate with the help of an example.

How to calculate tension in a string

1st law of newton say if a object in rest it remain in rest,if it is in motion it remail in motionj unless untill external force applied on it..they we my chage our state rest to motion it not apply any external force.how

Using a horizontal force of 200N a boy intends to move a cabinet across a floor with a constant velocity. What is the friction force that will be exerted on the cabinet?

A train is moving with a velocity of 90 km h−1.It is brought to stop by applying the brakes which produce a retardation of 0.5 m s−2.Find:(i) the velocity after 10 s, and (ii) the time taken by the train to come to rest.

Which technique is used to determine the depth of sea and underwater sunken ships? Explain its working.

On a horizontal frictionless surface, a block with a 4.00 kg mass in contact with a block of mass 2.00 kg, is accelerated by a +12.0 N force. Determine the force that the 2.00 kg block exerts on the 4.00 kg block.

Statement 1: Solar energy is a conventional form of energy. Statement 2: Solar energy is a renewable form of energy.

Why does a fire man struggle to hold a hose pipe

Why does a ball thrown vertically upwards in a moving train, come back to the thrower's hand?

State the energy transformation in the following : (i) electricity is obtained from solar energy. (ii) electricity is obtained from wind energy. (iii) electricity is obtained from hydro energy. (iv) electricity is obtained from nuclear energy.

A machine has a velocity ratio of 4. It is used to raise a load of 200 N by 4 m using an effort of 20 kgf. Find the work done on the machine. Take g=10ms−2.

Action and reaction which are equal and opposite do no cancel each other because_. Cricketer pulls his hand backward while catching a ball to decrease.