13232 + Interview Questions in Physics Page 240 InterviewSolution

11951.	Which of the following is the correct condition for a true balance:
Answer» Which of the following is the correct condition for a true balance:

Discussion

11952.	The magnetic field line passing through the centre of a circular current carrying conductor is
Answer» The magnetic field line passing through the centre of a circular current carrying conductor is

Discussion

11953.	Question 23 A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4ms−1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
Answer» Question 23 A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of $4 m s^{- 1}$ by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?

Discussion

11954.	Water is kept in a beaker of radius 5.0 cm. Consider a diameter of the beaker on the surface of the water. Find the force by which the surface on one side of the diameter pulls the surface on the other side. Surface tension of water = 0.075 N m-1.
Answer» Water is kept in a beaker of radius 5.0 cm. Consider a diameter of the beaker on the surface of the water. Find the force by which the surface on one side of the diameter pulls the surface on the other side. Surface tension of water = 0.075 N m^-1.

Discussion

11955.	Name the S.I. unit of time and define it.
Answer» Name the S.I. unit of time and define it.

Discussion

11956.	Use the following information to answer the next question. A traveller moves from the equator to one of the poles of earth. The weight of the travellercontinuously, whereas his massThe information in which alternative completes the given statement? The information in which alternative completes the given statement?
Answer» Use the following information to answer the next question. A traveller moves from the equator to one of the poles of earth. The weight of the travellercontinuously, whereas his massThe information in which alternative completes the given statement? The information in which alternative completes the given statement?

11956.

Use the following information to answer the next question. A traveller moves from the equator to one of the poles of earth. The weight of the travellercontinuously, whereas his massThe information in which alternative completes the given statement? The information in which alternative completes the given statement?

Answer»

Use the following information to answer the next question.

A traveller moves from the equator to one of the poles of earth. The weight of the travellercontinuously, whereas his massThe information in which alternative completes the given statement?

The information in which alternative completes the given statement?

Discussion

11957.	Why does a person in a freefalling lift experiences 0 weight?
Answer» Why does a person in a freefalling lift experiences 0 weight?

Discussion

11958.	What is escape velocity?
Answer» What is escape velocity?

Discussion

11959.	Are all physical quantities that have magnitude and direction vectors ? Give example to support your answer . When is a physical quantity called vector ?
Answer» Are all physical quantities that have magnitude and direction vectors ? Give example to support your answer . When is a physical quantity called vector ?

Discussion

11960.	A student sitting on the last bench can see the letters written on the board but has problem reading from his note book. What can be said about him?
Answer» A student sitting on the last bench can see the letters written on the board but has problem reading from his note book. What can be said about him?

Discussion

11961.	Assuming the speed of sound in air equal to 340 m s−1 and in water equal to 1360 m s−1, find the time taken to travel a distance 1700 m by sound in (i) air and (ii) water.
Answer» Assuming the speed of sound in air equal to 340 m $s^{- 1}$ and in water equal to 1360 m $s^{- 1}$ , find the time taken to travel a distance 1700 m by sound in (i) air and (ii) water.

Discussion

11962.	(a) What is the speed of γ−rays ? (b) Are they deflected by an electrostatic field ? [2 MARKS]
Answer» (a) What is the speed of $γ - r a y s$ ? (b) Are they deflected by an electrostatic field ? [2 MARKS]

Discussion

11963.	A charged rod is brought near a negatively charged pith ball electroscope. What conclusion do you draw about the charge on the rod if the pith ball moves towards the body:
Answer» A charged rod is brought near a negatively charged pith ball electroscope. What conclusion do you draw about the charge on the rod if the pith ball moves towards the body:

Discussion

11964.	The driver of a train traveling at 40 ms−1 applies the brakes as the train enters a station. The train slows down at a rate of 2 ms−2. The distance traveled by train before stopping is
Answer» The driver of a train traveling at $40 m s^{- 1}$ applies the brakes as the train enters a station. The train slows down at a rate of $2 m s^{- 2}$ . The distance traveled by train before stopping is

Discussion

11965.	Which of the following help in the communication between two astronauts on the moon?
Answer» Which of the following help in the communication between two astronauts on the moon?

Discussion

11966.	Question 11 Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 ms−1 before the collision during which they stick together. What will be the velocity of the combined object after collision?
Answer» Question 11 Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is $2.5 m s^{- 1}$ before the collision during which they stick together. What will be the velocity of the combined object after collision?

Discussion

11967.	A bus of 6 m long starts moving with an acceleration of 2ms−2. A cyclist 90 m behind the bus starts simultaneously towards the bus at 20 ms−1. After what minimum time will he be able to overtake the bus?
Answer» A bus of $6 m$ long starts moving with an acceleration of $2 m s^{- 2}$ . A cyclist $90 m$ behind the bus starts simultaneously towards the bus at $20 m s^{- 1}$ . After what minimum time will he be able to overtake the bus?

Discussion

11968.	A body starts at a point and reaches the same point after time t. Which of the following represents its displacement time graph?
Answer» A body starts at a point and reaches the same point after time $t$ . Which of the following represents its displacement time graph?

11968.

A body starts at a point and reaches the same point after time t. Which of the following represents its displacement time graph?

Answer»

A body starts at a point and reaches the same point after time $t$ . Which of the following represents its displacement time graph?

Discussion

11969.	A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]
Answer» A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]

Discussion

11970.	Which of these product equals to 1?
Answer» Which of these product equals to 1?

Discussion

11971.	Donald Duck conducted an experiment to test the conductivity of two liquids A and B by using a tester with magnetic needle. Current was passed through both the liquids and it was found that the magnetic needle deflected more in case of Liquid B. Which among these is a poorer conductor and why? [2 MARKS]
Answer» Donald Duck conducted an experiment to test the conductivity of two liquids A and B by using a tester with magnetic needle. Current was passed through both the liquids and it was found that the magnetic needle deflected more in case of Liquid B. Which among these is a poorer conductor and why? [2 MARKS]

Discussion

11972.	How does the gravitational force change between two objects when the distance between them is doubled ?
Answer» How does the gravitational force change between two objects when the distance between them is doubled ?

Discussion

11973.	A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed
Answer» A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed

Discussion

11974.	50kJ of energy causes a displacement of 25m for a body in the direction of force for 2.5s. Find the power in a unit of horse power.
Answer» $50kJ$ of energy causes a displacement of $25m$ for a body in the direction of force for $2.5s$ . Find the power in a unit of horse power.

Discussion

11975.	A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s. The man holding it can exert maximum force of 144 N on the gun. The number of bullets he can fire per second will be
Answer» A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s. The man holding it can exert maximum force of 144 N on the gun. The number of bullets he can fire per second will be

Discussion

11976.	A bullet of mass 40 g is horizontally fired with a velocity 100 ms−1 from a pistol of mass 2 kg. What is the recoil velocity of the pistol ?
Answer» A bullet of mass $40 g$ is horizontally fired with a velocity $100 m s^{- 1}$ from a pistol of mass $2 k g$ . What is the recoil velocity of the pistol ?

Discussion

11977.	To find speed which formula should we use v=u+at or speed =distance/time
Answer» To find speed which formula should we use v=u+at or speed =distance/time

Discussion

11978.	What do you understand by the intensity of sound? [1 MARK]
Answer» What do you understand by the intensity of sound? [1 MARK]

Discussion

11979.	Explain why, the flash of a gun shot reaches us before the sound of the gun shot.
Answer» Explain why, the flash of a gun shot reaches us before the sound of the gun shot.

Discussion

11980.	State three factors on which the pressure at a point in a liquid depends.
Answer» State three factors on which the pressure at a point in a liquid depends.

Discussion

11981.	A train moving with a velocity of 20 m s−1 is brought to rest by applying brakes in 5 s.Calculate the retardation.
Answer» A train moving with a velocity of 20 $m s^{- 1}$ is brought to rest by applying brakes in 5 s.Calculate the retardation.

Discussion

11982.	Name the instrument which can measure accurately the following : (a) the diameter of a needle, (b) the thickness of a paper, (c) the internal diameter of the neck of a water bottle, (d) the diameter of a pencil.
Answer» Name the instrument which can measure accurately the following : (a) the diameter of a needle, (b) the thickness of a paper, (c) the internal diameter of the neck of a water bottle, (d) the diameter of a pencil.

11982.

Name the instrument which can measure accurately the following : (a) the diameter of a needle, (b) the thickness of a paper, (c) the internal diameter of the neck of a water bottle, (d) the diameter of a pencil.

Answer»

Name the instrument which can measure accurately the following :

(a) the diameter of a needle,

(b) the thickness of a paper,

(c) the internal diameter of the neck of a water bottle,

(d) the diameter of a pencil.

Discussion

11983.	What can you say about the average density of a ship floating on water in relation to the density of water ?
Answer» What can you say about the average density of a ship floating on water in relation to the density of water ?

Discussion

11984.	A small indoor greenhouse is made entirely of glass panes held together with tape. It is 30 cm long, 25 cm wide and 25 cm high. How much of tape is needed for all the 12 edges?
Answer» A small indoor greenhouse is made entirely of glass panes held together with tape. It is $30 c m$ long, $25 c m$ wide and $25 c m$ high. How much of tape is needed for all the 12 edges?

Discussion

11985.	Explain the working of a hydraulic brake with a simple labelled diagram.
Answer» Explain the working of a hydraulic brake with a simple labelled diagram.

Discussion

11986.	A boy runs for 10 minutes at a uniform speed of 9 km/h. At what speed should he run for next 20 minutes so that the average speed comes to 12 km/h.
Answer» A boy runs for 10 minutes at a uniform speed of 9 km/h. At what speed should he run for next 20 minutes so that the average speed comes to 12 km/h.

Discussion

11987.	Pls can you explain what happens when you connect two cells in parallel? Thx
Answer» Pls can you explain what happens when you connect two cells in parallel? Thx

Discussion

11988.	Why the sound travel faster in a solid than in air an why it can't travel in vaccum
Answer» Why the sound travel faster in a solid than in air an why it can't travel in vaccum

Discussion

11989.	State the source of centripetal force that a planet requries to revolve around the Sun. On what factors does that force depend?
Answer» State the source of centripetal force that a planet requries to revolve around the Sun. On what factors does that force depend?

Discussion

11990.	A 200 cm3 block has a mass of 790 gram find its relative density
Answer» A 200 cm3 block has a mass of 790 gram find its relative density

Discussion

11991.	An odometer of a car reads 4200 km at the start of a trip and 4460 km at the end of a trip. If Rajiv took 4 hours 20 minutes to complete the trip.Then find the average speed and average velocity in kilometre per hour as well as in metre per second.
Answer» An odometer of a car reads 4200 km at the start of a trip and 4460 km at the end of a trip. If Rajiv took 4 hours 20 minutes to complete the trip.Then find the average speed and average velocity in kilometre per hour as well as in metre per second.

Discussion

11992.	Why is the work done by the gravitational force acting on an artificial satellite zero ? Give scientific reason
Answer» Why is the work done by the gravitational force acting on an artificial satellite zero ? Give scientific reason

Discussion

11993.	A bullet is fired from a gun of 15 kg with a velocity of 100 m/s . If mass of the bullet is 50 gm what will be the velocity of the gun and in which direction.
Answer» A bullet is fired from a gun of 15 kg with a velocity of 100 m/s . If mass of the bullet is 50 gm what will be the velocity of the gun and in which direction.

Discussion

11994.	If an elephant was chasing you, its enormous mass would be most threatening. But if you moved in a zigzag path, its big mass would become your advantage. Why?
Answer» If an elephant was chasing you, its enormous mass would be most threatening. But if you moved in a zigzag path, its big mass would become your advantage. Why?

Discussion

11995.	Numerical on upthrust,relative density and flotation with solution
Answer» Numerical on upthrust,relative density and flotation with solution

Discussion

11996.	Why isn't Average speed = Speed of 1st journey+Speed of 2nd journey/2
Answer» Why isn't Average speed = Speed of 1st journey+Speed of 2nd journey/2

Discussion

11997.	A ball thrown vertically upwards with a speed of 19.6 ms−1 from the top of a tower, it returns to the earth in 6 s. Find the height of the tower. [Take g = 9.8 m sec−2 ]
Answer» A ball thrown vertically upwards with a speed of 19.6 $m s^{- 1}$ from the top of a tower, it returns to the earth in 6 s. Find the height of the tower. [Take g = 9.8 m ${sec}^{- 2}$ ]

Discussion

11998.	Use the following information to answer the next question. Which wave represents the loudest sound?
Answer» Use the following information to answer the next question. Which wave represents the loudest sound?

11998.

Use the following information to answer the next question. Which wave represents the loudest sound?

Answer»

Use the following information to answer the next question.

Which wave represents the loudest sound?

Discussion

11999.	How does the density of material of a body determine whether it will float or sink in water ?
Answer» How does the density of material of a body determine whether it will float or sink in water ?

Discussion

12000.	A man pushes a truck initially at rest and weighing 6 tones along a horizontal track with a steady force 300 N. The resistance to motion amounts to 30 N per tone. The velocity of the truck at the end of 20 seconds is:
Answer» A man pushes a truck initially at rest and weighing 6 tones along a horizontal track with a steady force 300 N. The resistance to motion amounts to 30 N per tone. The velocity of the truck at the end of 20 seconds is:

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is the correct condition for a true balance:

The magnetic field line passing through the centre of a circular current carrying conductor is

Question 23 A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4ms−1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?

Water is kept in a beaker of radius 5.0 cm. Consider a diameter of the beaker on the surface of the water. Find the force by which the surface on one side of the diameter pulls the surface on the other side. Surface tension of water = 0.075 N m-1.

Name the S.I. unit of time and define it.

Why does a person in a freefalling lift experiences 0 weight?

What is escape velocity?

Are all physical quantities that have magnitude and direction vectors ? Give example to support your answer . When is a physical quantity called vector ?

A student sitting on the last bench can see the letters written on the board but has problem reading from his note book. What can be said about him?

Assuming the speed of sound in air equal to 340 m s−1 and in water equal to 1360 m s−1, find the time taken to travel a distance 1700 m by sound in (i) air and (ii) water.

(a) What is the speed of γ−rays ? (b) Are they deflected by an electrostatic field ? [2 MARKS]

A charged rod is brought near a negatively charged pith ball electroscope. What conclusion do you draw about the charge on the rod if the pith ball moves towards the body:

The driver of a train traveling at 40 ms−1 applies the brakes as the train enters a station. The train slows down at a rate of 2 ms−2. The distance traveled by train before stopping is

Which of the following help in the communication between two astronauts on the moon?

Question 11 Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 ms−1 before the collision during which they stick together. What will be the velocity of the combined object after collision?

A bus of 6 m long starts moving with an acceleration of 2ms−2. A cyclist 90 m behind the bus starts simultaneously towards the bus at 20 ms−1. After what minimum time will he be able to overtake the bus?

A body starts at a point and reaches the same point after time t. Which of the following represents its displacement time graph?

A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]

Which of these product equals to 1?

How does the gravitational force change between two objects when the distance between them is doubled ?

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed

50kJ of energy causes a displacement of 25m for a body in the direction of force for 2.5s. Find the power in a unit of horse power.

A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s. The man holding it can exert maximum force of 144 N on the gun. The number of bullets he can fire per second will be

A bullet of mass 40 g is horizontally fired with a velocity 100 ms−1 from a pistol of mass 2 kg. What is the recoil velocity of the pistol ?

To find speed which formula should we use v=u+at or speed =distance/time

What do you understand by the intensity of sound? [1 MARK]

Explain why, the flash of a gun shot reaches us before the sound of the gun shot.

State three factors on which the pressure at a point in a liquid depends.

A train moving with a velocity of 20 m s−1 is brought to rest by applying brakes in 5 s.Calculate the retardation.

Name the instrument which can measure accurately the following : (a) the diameter of a needle, (b) the thickness of a paper, (c) the internal diameter of the neck of a water bottle, (d) the diameter of a pencil.

What can you say about the average density of a ship floating on water in relation to the density of water ?

A small indoor greenhouse is made entirely of glass panes held together with tape. It is 30 cm long, 25 cm wide and 25 cm high. How much of tape is needed for all the 12 edges?

Explain the working of a hydraulic brake with a simple labelled diagram.

A boy runs for 10 minutes at a uniform speed of 9 km/h. At what speed should he run for next 20 minutes so that the average speed comes to 12 km/h.

Pls can you explain what happens when you connect two cells in parallel? Thx

Why the sound travel faster in a solid than in air an why it can't travel in vaccum

State the source of centripetal force that a planet requries to revolve around the Sun. On what factors does that force depend?

A 200 cm3 block has a mass of 790 gram find its relative density

An odometer of a car reads 4200 km at the start of a trip and 4460 km at the end of a trip. If Rajiv took 4 hours 20 minutes to complete the trip.Then find the average speed and average velocity in kilometre per hour as well as in metre per second.

Why is the work done by the gravitational force acting on an artificial satellite zero ? Give scientific reason

A bullet is fired from a gun of 15 kg with a velocity of 100 m/s . If mass of the bullet is 50 gm what will be the velocity of the gun and in which direction.

If an elephant was chasing you, its enormous mass would be most threatening. But if you moved in a zigzag path, its big mass would become your advantage. Why?

Numerical on upthrust,relative density and flotation with solution

Why isn't Average speed = Speed of 1st journey+Speed of 2nd journey/2

A ball thrown vertically upwards with a speed of 19.6 ms−1 from the top of a tower, it returns to the earth in 6 s. Find the height of the tower. [Take g = 9.8 m sec−2 ]

Use the following information to answer the next question. Which wave represents the loudest sound?

How does the density of material of a body determine whether it will float or sink in water ?

A man pushes a truck initially at rest and weighing 6 tones along a horizontal track with a steady force 300 N. The resistance to motion amounts to 30 N per tone. The velocity of the truck at the end of 20 seconds is: