13232 + Interview Questions in Physics Page 99 InterviewSolution

4901.	Define speed.What is its S.I. unit ?
Answer» Define speed.What is its S.I. unit ?

Discussion

4902.	Which of the following wiring diagrams could be used to experimentally determine R using ohm's law ? Assume an ideal voltmeter and an ideal ammeter.
Answer» Which of the following wiring diagrams could be used to experimentally determine $R$ using ohm's law ? Assume an ideal voltmeter and an ideal ammeter.

Discussion

4903.	A car moving with a speed of 54 km/h is brought to rest in 10 seconds by applying brakes. Find the magnitude of average retardation produced by the brakes.
Answer» A car moving with a speed of $54 km/h$ is brought to rest in $10 seconds$ by applying brakes. Find the magnitude of average retardation produced by the brakes.

Discussion

4904.	The weight of water displaced by an iron object is 10 kg. The buoyant force acting on the iron object is
Answer» The weight of water displaced by an iron object is 10 kg. The buoyant force acting on the iron object is

Discussion

4905.	How are wavelength and frequency of a sound wave related to itsi speed
Answer» How are wavelength and frequency of a sound wave related to itsi speed

Discussion

4906.	What is the order of magnitude
Answer» What is the order of magnitude

Discussion

4907.	30. What is velocity of effluxion.
Answer» 30. What is velocity of effluxion.

Discussion

4908.	The frequency of wave is 6 ×1015 s–1. Its wave number would be
Answer» The frequency of wave is 6 ×1015 s–1. Its wave number would be

Discussion

4909.	Two particles of mass 1kg and 2kg are projected upward.Mass 2kg is peojected from top of the towre and mass 1kg projected from basr of the tower of height 40m .If the projection speed of the paeticles are 20m/s and 10m/s respectively. Find the maximum height attained by the center of mas of the system
Answer» Two particles of mass 1kg and 2kg are projected upward.Mass 2kg is peojected from top of the towre and mass 1kg projected from basr of the tower of height 40m .If the projection speed of the paeticles are 20m/s and 10m/s respectively. Find the maximum height attained by the center of mas of the system

Discussion

4910.	Charges 2q and-q are placed at (a,0) and (-a, 0)The co-ordinates of the point at which electric fieldintensity is zero will be (x, 0) where
Answer» Charges 2q and-q are placed at (a,0) and (-a, 0)The co-ordinates of the point at which electric fieldintensity is zero will be (x, 0) where

Discussion

4911.	The natural tendency of objects to resist a change in their state of rest or uniform motion is called:
Answer» The natural tendency of objects to resist a change in their state of rest or uniform motion is called:

Discussion

4912.	A compressor undergoes a reversible, steady flow process. The gas at inlet and outlet of the compressor is designated as state 1 and state 2 respectively. Potential and kinetic energy changes are to be ignored. The following notations are used: v= specific volume and P = pressure of the gas. The specific work required to be supplied to the compressor for this gas compression process is
Answer» A compressor undergoes a reversible, steady flow process. The gas at inlet and outlet of the compressor is designated as state 1 and state 2 respectively. Potential and kinetic energy changes are to be ignored. The following notations are used: v= specific volume and P = pressure of the gas. The specific work required to be supplied to the compressor for this gas compression process is

Discussion

4913.	Lugage placed on the roof of a car or bus is tied with rope.Give reason.
Answer» Lugage placed on the roof of a car or bus is tied with rope.Give reason.

Discussion

4914.	A particle with a specific charge s is fired with a speed v towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in the region for the particle not to hit the wall?
Answer» A particle with a specific charge s is fired with a speed v towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in the region for the particle not to hit the wall?

Discussion

4915.	Q)The laws of reflection or refraction are the same for sound as for light . The index of refraction of a medium (for sound) is defined as the ratio of the speed of sound in air 343 m/s to the speed of sound in the medium. a) what is the critical angle θ for total reflection from water(v=1498)
Answer» Q)The laws of reflection or refraction are the same for sound as for light . The index of refraction of a medium (for sound) is defined as the ratio of the speed of sound in air 343 m/s to the speed of sound in the medium. a) what is the critical angle θ for total reflection from water(v=1498)

Discussion

4916.	a fire fighter holds a water pipe of cross section 1mm^2 the water comes out at a rate of 200cc/s .the reactionary force exerted on the hand of the fire fighter is
Answer» a fire fighter holds a water pipe of cross section 1mm^2 the water comes out at a rate of 200cc/s .the reactionary force exerted on the hand of the fire fighter is

Discussion

4917.	28.Small block of mass M is kept on a roughinclinedl surface inclination (theta)fixed in an elevator.elevator goes up with a uniform velocity v and the block does not slide on the wedge the work done by the force of friction on the block in a time t will be
Answer» 28.Small block of mass M is kept on a roughinclinedl surface inclination (theta)fixed in an elevator.elevator goes up with a uniform velocity v and the block does not slide on the wedge the work done by the force of friction on the block in a time t will be

Discussion

4918.	a driver of a three wheeler moving with a speed of 36 km per hour see's a child standing in the middle of the road and bring his vehicle at rest in 0.4 seconds just in time to save the child.the average retarding force on the vehicle is ( the mass of the three wheeler is 400 kg and mass of the driver is 60 kg)
Answer» a driver of a three wheeler moving with a speed of 36 km per hour see's a child standing in the middle of the road and bring his vehicle at rest in 0.4 seconds just in time to save the child.the average retarding force on the vehicle is ( the mass of the three wheeler is 400 kg and mass of the driver is 60 kg)

Discussion

4919.	A good conductor of heat is :
Answer» A good conductor of heat is :

Discussion

4920.	A motorboat starting from rest on a lake accelerates in a straight line at a constant rate if 3.0 m/s² for 8.0 seconds. How far does the boat travel during this time?
Answer» A motorboat starting from rest on a lake accelerates in a straight line at a constant rate if 3.0 m/s² for 8.0 seconds. How far does the boat travel during this time?

Discussion

4921.	A particle is moving in a circular path of radius r, the displacement after half a circle would be
Answer» A particle is moving in a circular path of radius r, the displacement after half a circle would be

Discussion

4922.	The unit torr is related to the barometric height as (a) 1 torr = 1 cm of Hg (b) 1 torr = 0.76 m of Hg (c) 1 torr = 1 mm of Hg (d) 1 torr = 1 m of Hg
Answer» The unit torr is related to the barometric height as (a) 1 torr = 1 cm of Hg (b) 1 torr = 0.76 m of Hg (c) 1 torr = 1 mm of Hg (d) 1 torr = 1 m of Hg

4922.

The unit torr is related to the barometric height as (a) 1 torr = 1 cm of Hg (b) 1 torr = 0.76 m of Hg (c) 1 torr = 1 mm of Hg (d) 1 torr = 1 m of Hg

Answer»

The unit torr is related to the barometric height as

(a) 1 torr = 1 cm of Hg

(b) 1 torr = 0.76 m of Hg
(c) 1 torr = 1 mm of Hg

(d) 1 torr = 1 m of Hg

Discussion

4923.	Question 3Which of the following is true for displacement?(a) It cannot be zero.(b) Its magnitude is greater than the distance travelled by the object
Answer» Question 3 Which of the following is true for displacement? (a) It cannot be zero. (b) Its magnitude is greater than the distance travelled by the object

Discussion

4924.	In India, household circuits are rated at___.
Answer» In India, household circuits are rated at___.

Discussion

4925.	Question 1A bus starting from rest moves with a uniform acceleration of 0.1 ms−2 for 2 minutes. Find(a) the speed acquired, (b) the distance travelled.
Answer» Question 1 A bus starting from rest moves with a uniform acceleration of $0.1 m s^{- 2}$ for 2 minutes. Find (a) the speed acquired, (b) the distance travelled.

Discussion

4926.	In high air pressure, the molecules are
Answer» In high air pressure, the molecules are

Discussion

4927.	A constant retarding force of 50N is applied to a body of mass 20kg moving with the speed of 15m/s. How long does the body take to stop? Ans1 Given F=50N M=20kg u=15m/s v=0 As F=ma a=50/20=2.5m/s^2 Since the retarding is negativd so -2.5 m/s^2 Time= v=u+at =0-15/-2.5=6s Ans2 F=ma 50=20×0-15/t 50=20×-15/t 50/20×-15=1/t -6 s=t Why the 2 is incorrect ?
Answer» A constant retarding force of 50N is applied to a body of mass 20kg moving with the speed of 15m/s. How long does the body take to stop? Ans1 Given F=50N M=20kg u=15m/s v=0 As F=ma a=50/20=2.5m/s^2 Since the retarding is negativd so -2.5 m/s^2 Time= v=u+at =0-15/-2.5=6s Ans2 F=ma 50=20×0-15/t 50=20×-15/t 50/20×-15=1/t -6 s=t Why the 2 is incorrect ?

4927.

A constant retarding force of 50N is applied to a body of mass 20kg moving with the speed of 15m/s. How long does the body take to stop? Ans1 Given F=50N M=20kg u=15m/s v=0 As F=ma a=50/20=2.5m/s^2 Since the retarding is negativd so -2.5 m/s^2 Time= v=u+at =0-15/-2.5=6s Ans2 F=ma 50=20×0-15/t 50=20×-15/t 50/20×-15=1/t -6 s=t Why the 2 is incorrect ?

Answer»

A constant retarding force of 50N is applied to a body of mass 20kg moving with the speed of 15m/s. How long does the body take to stop?

Ans1 Given

F=50N

M=20kg

u=15m/s

v=0

As F=ma

a=50/20=2.5m/s^2

Since the retarding is negativd so -2.5 m/s^2

Time=

v=u+at

=0-15/-2.5=6s

Ans2 F=ma

50=20×0-15/t

50=20×-15/t

50/20×-15=1/t

-6 s=t

Why the 2 is incorrect ?

Discussion

4928.	Two metallic spheres of different materials are completely immersed in water experience equal upthrust. Then both the spheres have equal
Answer» Two metallic spheres of different materials are completely immersed in water experience equal upthrust. Then both the spheres have equal

Discussion

4929.	Find the velocity of image w.r.t ground. The mirror is at rest and the object is moving perpendicular to the axis with 5 m/s as in figure.The magnitude of velocity of image(in m/s) is
Answer» Find the velocity of image w.r.t ground. The mirror is at rest and the object is moving perpendicular to the axis with $5 m/s$ as in figure.The magnitude of velocity of image(in $m/s$ ) is

Discussion

4930.	A certain circuit with resistance,R=100 ohm is powered by a direct current source. An ammeter with an internal resistance 1 ohm is connected to the circuit to measure the current.what was the current in the circuit before the ammeter was connected if the ammeter shows 5 ampere?
Answer» A certain circuit with resistance,R=100 ohm is powered by a direct current source. An ammeter with an internal resistance 1 ohm is connected to the circuit to measure the current.what was the current in the circuit before the ammeter was connected if the ammeter shows 5 ampere?

Discussion

4931.	What happens when an object is kept behind concave mirror using ray diagram?
Answer» What happens when an object is kept behind concave mirror using ray diagram?

Discussion

4932.	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 thundering was heard. Calculate the height of the clouds which caused this lightning. Given, speed of light =3×108 ms−1 and speed of sound =340 ms−1.
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 thundering was heard. Calculate the height of the clouds which caused this lightning. Given, speed of light $= 3 \times 10^{8} m s^{- 1}$ and speed of sound $= 340 m s^{- 1}$ .

Discussion

4933.	A block of mass m is placed at point A on a rough track as shown in the figure. If slightly pushed towards right, it stops at point B of the track. Calculate the work done by the frictional force on the block during its transit from A to B.
Answer» A block of mass m is placed at point A on a rough track as shown in the figure. If slightly pushed towards right, it stops at point B of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

Discussion

4934.	Uses of ultrasonic sound.
Answer» Uses of ultrasonic sound.

Discussion

4935.	Define velocity. What is SI unit of velocity?
Answer» Define velocity. What is $S I$ unit of velocity?

Discussion

4936.	If the mass of the body increases, the acceleration of the body is likely to
Answer» If the mass of the body increases, the acceleration of the body is likely to

Discussion

4937.	A mass of 2 kg is supended from a steel wire of length 1 meter to form a pendulum arrangement. If the mass is moved on one side and released from the horizontal position position then find the maximum extention of the of the wire
Answer» A mass of 2 kg is supended from a steel wire of length 1 meter to form a pendulum arrangement. If the mass is moved on one side and released from the horizontal position position then find the maximum extention of the of the wire

Discussion

4938.	magnetic flux linked with coil varies with time t as flux=t^2-4t^4 magnitude of emf induced when flux becomes zero is
Answer» magnetic flux linked with coil varies with time t as flux=t^2-4t^4 magnitude of emf induced when flux becomes zero is

Discussion

4939.	three particles A,B,C are projected from top of tower with same speed.A is thrown straight upward B straight downward and C horizontally they hit the ground with speed va, vb, vc then which is correct 1)va=vb>vc 2)va= vb= vc 3)va >vb=vc 4)vb>vc >va
Answer» three particles A,B,C are projected from top of tower with same speed.A is thrown straight upward B straight downward and C horizontally they hit the ground with speed va, vb, vc then which is correct 1)va=vb>vc 2)va= vb= vc 3)va >vb=vc 4)vb>vc >va

Discussion

4940.	A boy tied a string to one of the ends of a box and started sliding the box on a playground. He then observed a circular track and rushed there and completed one revolution of the track with his toy. The work done by friction on the toy is
Answer» A boy tied a string to one of the ends of a box and started sliding the box on a playground. He then observed a circular track and rushed there and completed one revolution of the track with his toy. The work done by friction on the toy is

Discussion

4941.	inear mass density of a rod AB (of length l ) varies with dis†an ce x from end A of the rod as given by λ=λ_ox^4. Here λ_0 is cons†an t . Dis†an ce of centre of mass of the rod from end B is
Answer» inear mass density of a rod AB (of length l ) varies with dis†an ce x from end A of the rod as given by λ=λ_ox^4. Here λ_0 is cons†an t . Dis†an ce of centre of mass of the rod from end B is

Discussion

4942.	What is the acceleration of a van that starts from rest and attains a speed of 20 m/s in 25 seconds?
Answer» What is the acceleration of a van that starts from rest and attains a speed of $20 m / s$ in 25 seconds?

Discussion

4943.	Which of these statements are true? (A) The horse applies a force on the cart and the cart pulls the horse back with a force equal and opposite in direction. (B) The horse applies a force on the cart and the cart applies a force on the ground. (C) The two forces mentioned in option one A each other (D) The two forces in option A are acting on two different bodies and don’t cancel each other.
Answer» Which of these statements are true? (A) The horse applies a force on the cart and the cart pulls the horse back with a force equal and opposite in direction. (B) The horse applies a force on the cart and the cart applies a force on the ground. (C) The two forces mentioned in option one A each other (D) The two forces in option A are acting on two different bodies and don’t cancel each other.

4943.

Which of these statements are true? (A) The horse applies a force on the cart and the cart pulls the horse back with a force equal and opposite in direction. (B) The horse applies a force on the cart and the cart applies a force on the ground. (C) The two forces mentioned in option one A each other (D) The two forces in option A are acting on two different bodies and don’t cancel each other.

Answer»

Which of these statements are true?

(A) The horse applies a force on the cart and the cart pulls the horse back with a force equal and opposite in direction.

(B) The horse applies a force on the cart and the cart applies a force on the ground.

(C) The two forces mentioned in option one A each other

(D) The two forces in option A are acting on two different bodies and don’t cancel each other.

Discussion

4944.	Two objects are dropped from the same point after an interval of 2 seconds. Vertical distance between them 4 seconds after the release of the second object will be (g=10 m/ s2)
Answer» Two objects are dropped from the same point after an interval of 2 seconds. Vertical distance between them 4 seconds after the release of the second object will be (g=10 m/ s2)

Discussion

4945.	Explain Newton's law of universal gravitation.
Answer» Explain Newton's law of universal gravitation.

Discussion

4946.	In an experiment, mass of an object is measured by applying a known force on it, and then measuring its acceleration. IF, in the experiment, the measured values of applied force and the measured acceleration are F = 10.0 ± 0.2N and a = 1.00 ± 0.01 m/s2, respectively, the mass of the object is
Answer» In an experiment, mass of an object is measured by applying a known force on it, and then measuring its acceleration. IF, in the experiment, the measured values of applied force and the measured acceleration are F = 10.0 $\pm$ 0.2N and a = 1.00 $\pm$ 0.01 m/s $^{2}$ , respectively, the mass of the object is

Discussion

4947.	Petroleum is:
Answer» Petroleum is:

Discussion

4948.	How does the sun produce light?
Answer» How does the sun produce light?

Discussion

4949.	Express mathematically the change in velocity of an object per unit time.
Answer» Express mathematically the change in velocity of an object per unit time.

Discussion

4950.	Ice is a solid though it floats on water.why?
Answer» Ice is a solid though it floats on water.why?

Discussion

Explore topic-wise InterviewSolutions in .

Define speed.What is its S.I. unit ?

Which of the following wiring diagrams could be used to experimentally determine R using ohm's law ? Assume an ideal voltmeter and an ideal ammeter.

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The weight of water displaced by an iron object is 10 kg. The buoyant force acting on the iron object is

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30. What is velocity of effluxion.

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Charges 2q and-q are placed at (a,0) and (-a, 0)The co-ordinates of the point at which electric fieldintensity is zero will be (x, 0) where

The natural tendency of objects to resist a change in their state of rest or uniform motion is called:

Lugage placed on the roof of a car or bus is tied with rope.Give reason.

A particle with a specific charge s is fired with a speed v towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in the region for the particle not to hit the wall?

Q)The laws of reflection or refraction are the same for sound as for light . The index of refraction of a medium (for sound) is defined as the ratio of the speed of sound in air 343 m/s to the speed of sound in the medium. a) what is the critical angle θ for total reflection from water(v=1498)

a fire fighter holds a water pipe of cross section 1mm^2 the water comes out at a rate of 200cc/s .the reactionary force exerted on the hand of the fire fighter is

28.Small block of mass M is kept on a roughinclinedl surface inclination (theta)fixed in an elevator.elevator goes up with a uniform velocity v and the block does not slide on the wedge the work done by the force of friction on the block in a time t will be

A good conductor of heat is :

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate if 3.0 m/s² for 8.0 seconds. How far does the boat travel during this time?

A particle is moving in a circular path of radius r, the displacement after half a circle would be

The unit torr is related to the barometric height as (a) 1 torr = 1 cm of Hg (b) 1 torr = 0.76 m of Hg (c) 1 torr = 1 mm of Hg (d) 1 torr = 1 m of Hg

Question 3Which of the following is true for displacement?(a) It cannot be zero.(b) Its magnitude is greater than the distance travelled by the object

In India, household circuits are rated at___.

Question 1A bus starting from rest moves with a uniform acceleration of 0.1 ms−2 for 2 minutes. Find(a) the speed acquired, (b) the distance travelled.

In high air pressure, the molecules are

Two metallic spheres of different materials are completely immersed in water experience equal upthrust. Then both the spheres have equal

Find the velocity of image w.r.t ground. The mirror is at rest and the object is moving perpendicular to the axis with 5 m/s as in figure.The magnitude of velocity of image(in m/s) is

A certain circuit with resistance,R=100 ohm is powered by a direct current source. An ammeter with an internal resistance 1 ohm is connected to the circuit to measure the current.what was the current in the circuit before the ammeter was connected if the ammeter shows 5 ampere?

What happens when an object is kept behind concave mirror using ray diagram?

A block of mass m is placed at point A on a rough track as shown in the figure. If slightly pushed towards right, it stops at point B of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

Uses of ultrasonic sound.

Define velocity. What is SI unit of velocity?

If the mass of the body increases, the acceleration of the body is likely to

A mass of 2 kg is supended from a steel wire of length 1 meter to form a pendulum arrangement. If the mass is moved on one side and released from the horizontal position position then find the maximum extention of the of the wire

magnetic flux linked with coil varies with time t as flux=t^2-4t^4 magnitude of emf induced when flux becomes zero is

three particles A,B,C are projected from top of tower with same speed.A is thrown straight upward B straight downward and C horizontally they hit the ground with speed va, vb, vc then which is correct 1)va=vb>vc 2)va= vb= vc 3)va >vb=vc 4)vb>vc >va

A boy tied a string to one of the ends of a box and started sliding the box on a playground. He then observed a circular track and rushed there and completed one revolution of the track with his toy. The work done by friction on the toy is

inear mass density of a rod AB (of length l ) varies with dis†an ce x from end A of the rod as given by λ=λ_ox^4. Here λ_0 is cons†an t . Dis†an ce of centre of mass of the rod from end B is

What is the acceleration of a van that starts from rest and attains a speed of 20 m/s in 25 seconds?

Two objects are dropped from the same point after an interval of 2 seconds. Vertical distance between them 4 seconds after the release of the second object will be (g=10 m/ s2)

Explain Newton's law of universal gravitation.

In an experiment, mass of an object is measured by applying a known force on it, and then measuring its acceleration. IF, in the experiment, the measured values of applied force and the measured acceleration are F = 10.0 ± 0.2N and a = 1.00 ± 0.01 m/s2, respectively, the mass of the object is

Petroleum is:

How does the sun produce light?

Express mathematically the change in velocity of an object per unit time.

Ice is a solid though it floats on water.why?