13232 + Interview Questions in Physics Page 239 InterviewSolution

11901.	The value of the universal gravitational constant is .
Answer» The value of the universal gravitational constant is .

Discussion

11902.	Forces F1 and F2 are acting on a body in opposite directions. The body displaces by 's' metres in the direction of force F2. What is the total work done on the body?
Answer» Forces $F_{1}$ and $F_{2}$ are acting on a body in opposite directions. The body displaces by 's' metres in the direction of force $F_{2}$ . What is the total work done on the body?

Discussion

11903.	Newton's Third Law states that every action has an equal an opposite reaction. If a massive truck is parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal force cancel each other. Comment on this statement. [3 MARKS]
Answer» Newton's Third Law states that every action has an equal an opposite reaction. If a massive truck is parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal force cancel each other. Comment on this statement. [3 MARKS]

Discussion

11904.	Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pulling it. The work done on the block is:
Answer» Vijay is pulling a block with $22 N$ force and Gopal is pulling it with $10 N$ force in the opposite direction. The block moves a distance of $6.5 m$ in the same direction in which Vijay is pulling it. The work done on the block is:

Discussion

11905.	A rocket is moving up with velocity v. If the velocity of the rocket is tripled, what will be the ratio of kinetic energies? [2 MARKS]
Answer» A rocket is moving up with velocity v. If the velocity of the rocket is tripled, what will be the ratio of kinetic energies? [2 MARKS]

Discussion

11906.	The mass of a body on earth is 60 kg, its mass on moon is
Answer» The mass of a body on earth is 60 kg, its mass on moon is

Discussion

11907.	A nucleus AZX going through a β+ decay will end up taking what configuration?
Answer» A nucleus $_{Z}^{A} X$ going through a $β^{+}$ decay will end up taking what configuration?

Discussion

11908.	Pick out the option which is not an application of Archimedes principle.
Answer» Pick out the option which is not an application of Archimedes principle.

Discussion

11909.	Which of the following uses multiple reflections of sound?
Answer» Which of the following uses multiple reflections of sound?

Discussion

11910.	A body starting with initial velocity u moves with a constant accelearation a. Find the expression for distance travelled in nth second. A body was dropped from a very high building, calculate its distance travelled in 5th second. [5 MARKS]
Answer» A body starting with initial velocity u moves with a constant accelearation a. Find the expression for distance travelled in n^th second. A body was dropped from a very high building, calculate its distance travelled in 5th second. [5 MARKS]

Discussion

11911.	Question 10 Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
Answer» Question 10 Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?

Discussion

11912.	A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is :
Answer» A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R^{^{'}}$ , then the ratio $\frac{R}{R^{^{'}}}$ is :

Discussion

11913.	Figure Shows the graph of velocity versus time for a particuler going along the X-axis. Find (a) The aceleration, (b) The distance reavelled in 0 to 10 s and (c) The displacement in 0 to 10 s.
Answer» Figure Shows the graph of velocity versus time for a particuler going along the X-axis. Find (a) The aceleration, (b) The distance reavelled in 0 to 10 s and (c) The displacement in 0 to 10 s.

11913.

Figure Shows the graph of velocity versus time for a particuler going along the X-axis. Find (a) The aceleration, (b) The distance reavelled in 0 to 10 s and (c) The displacement in 0 to 10 s.

Answer»

Figure Shows the graph of velocity versus time for a particuler going along the X-axis. Find

(a) The aceleration,

(b) The distance reavelled in 0 to 10 s and

(c) The displacement in 0 to 10 s.

Discussion

11914.	Two objects, each of mass 1.0 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. they sticked together after collision. What will be the velocity of the combined object after collision?
Answer» Two objects, each of mass 1.0 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. they sticked together after collision. What will be the velocity of the combined object after collision?

Discussion

11915.	Starting from rest at the top of an inclined plane a body reaches the bottom in 4 seconds. In what time does the body cover one-fourth the distance starting from the top?
Answer» Starting from rest at the top of an inclined plane a body reaches the bottom in 4 seconds. In what time does the body cover one-fourth the distance starting from the top?

Discussion

11916.	A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car : (a) does not change (b) becomes twice that of initial potential energy (c) becomes 4 times that of initial potential energy (d) becomes 16 times that of initial potential energy
Answer» A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car : (a) does not change (b) becomes twice that of initial potential energy (c) becomes 4 times that of initial potential energy (d) becomes 16 times that of initial potential energy

11916.

A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car : (a) does not change (b) becomes twice that of initial potential energy (c) becomes 4 times that of initial potential energy (d) becomes 16 times that of initial potential energy

Answer»

A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car :

(a) does not change

(b) becomes twice that of initial potential energy

(c) becomes 4 times that of initial potential energy

(d) becomes 16 times that of initial potential energy

Discussion

11917.	Newton’s third law of motion states that for every action, there is an equal and opposite reaction. Which of the following statement can be inferred from above mentioned law of motion? Statement 1: every interaction, there is a pair of forces acting on the two interacting objects Statement 2: The size of the forces on the first object equals the size of the force on the second object Statement 3: Forces always come in pairs - equal and opposite action-reaction force pairs Statement 4: Force and reaction act on same bodies Statement 5: Force and reaction act on two different bodies
Answer» Newton’s third law of motion states that for every action, there is an equal and opposite reaction. Which of the following statement can be inferred from above mentioned law of motion? Statement 1 $:$ every interaction, there is a pair of forces acting on the two interacting objects Statement 2 $:$ The size of the forces on the first object equals the size of the force on the second object Statement 3 $:$ Forces always come in pairs - equal and opposite action-reaction force pairs Statement 4 $:$ Force and reaction act on same bodies Statement 5 $:$ Force and reaction act on two different bodies

11917.

Newton’s third law of motion states that for every action, there is an equal and opposite reaction. Which of the following statement can be inferred from above mentioned law of motion? Statement 1: every interaction, there is a pair of forces acting on the two interacting objects Statement 2: The size of the forces on the first object equals the size of the force on the second object Statement 3: Forces always come in pairs - equal and opposite action-reaction force pairs Statement 4: Force and reaction act on same bodies Statement 5: Force and reaction act on two different bodies

Answer»

Newton’s third law of motion states that for every action, there is an equal and opposite reaction. Which of the following statement can be inferred from above mentioned law of motion?

Statement 1 $:$ every interaction, there is a pair of forces acting on the two interacting objects

Statement 2 $:$ The size of the forces on the first object equals the size of the force on the second object

Statement 3 $:$ Forces always come in pairs - equal and opposite action-reaction force pairs

Statement 4 $:$ Force and reaction act on same bodies

Statement 5 $:$ Force and reaction act on two different bodies

Discussion

11918.	Which of the following images represent the refraction of light?
Answer» Which of the following images represent the refraction of light?

Discussion

11919.	Mohan jokes from one and a to the another and b of a straight 300m road in 2 minutes 30 seconds and then he turns around and start jogs hundred metre back to the point c in 1 minute what are Mohan's average speed and average velocity in jogging 1. From A to B 2. From A to C
Answer» Mohan jokes from one and a to the another and b of a straight 300m road in 2 minutes 30 seconds and then he turns around and start jogs hundred metre back to the point c in 1 minute what are Mohan's average speed and average velocity in jogging 1. From A to B 2. From A to C

11919.

Mohan jokes from one and a to the another and b of a straight 300m road in 2 minutes 30 seconds and then he turns around and start jogs hundred metre back to the point c in 1 minute what are Mohan's average speed and average velocity in jogging 1. From A to B 2. From A to C

Answer»

Mohan jokes from one and a to the another and b of a straight 300m road in 2 minutes 30 seconds and then he turns around and start jogs hundred metre back to the point c in 1 minute what are Mohan's average speed and average velocity in jogging

1. From A to B

2. From A to C

Discussion

11920.	A force of 10 N is applied to two bodies of different masses. Body 1 has mass, M1=10kg and body 2 has mass, M2=15kg. What is the ratio of the accelerations of bodies 1 and 2?
Answer» A force of 10 N is applied to two bodies of different masses. Body 1 has mass, $M_{1} = 10 k g$ and body 2 has mass, $M_{2} = 15 k g$ . What is the ratio of the accelerations of bodies 1 and 2?

Discussion

11921.	What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :
Answer» What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :

11921.

What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :

Answer»

What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :

Discussion

11922.	A body moving with a constant acceleration travels the distances 3 m and 8 m repsectively in 1 s and 2 s.Calculate: (i) the initial velocity ,and (ii) the acceleration of body.
Answer» A body moving with a constant acceleration travels the distances 3 m and 8 m repsectively in 1 s and 2 s.Calculate: (i) the initial velocity ,and (ii) the acceleration of body.

Discussion

11923.	A ball thrown up vertically returns to the thrower after 6 s. Find the position of the ball after 4 s. (Take acceleration due to gravity as 9.8 ms−2)
Answer» A ball thrown up vertically returns to the thrower after $6 s$ . Find the position of the ball after $4 s$ . (Take acceleration due to gravity as $9.8 m s^{- 2}$ )

Discussion

11924.	length of a conducting wire is increased by 100% by stretching it.the change in the resistance of the wire is?
Answer» length of a conducting wire is increased by 100% by stretching it.the change in the resistance of the wire is?

Discussion

11925.	A body has a weight of 10 kg on the surface of earth. What will be its weight when taken to the centre of the earth ?
Answer» A body has a weight of 10 kg on the surface of earth. What will be its weight when taken to the centre of the earth ?

Discussion

11926.	How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall ? (g = 10 m s−2)
Answer» How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall ? (g = 10 $m s^{- 2}$ )

Discussion

11927.	Name the device which is used to address a small gathering of people.
Answer» Name the device which is used to address a small gathering of people.

Discussion

11928.	State the volume changes observed when a given mass of water is heated from 0∘ to 10∘. Sketch a temperature-volume graph to show the behaviour.
Answer» State the volume changes observed when a given mass of water is heated from $0^{\circ}$ to $10^{\circ}$ . Sketch a temperature-volume graph to show the behaviour.

Discussion

11929.	Calculate the gravitation force between two bodies of mass 80kg and 1200kg kept seperated by a distance of 10m
Answer» Calculate the gravitation force between two bodies of mass 80kg and 1200kg kept seperated by a distance of 10m

Discussion

11930.	Atmospheric pressure is measured using:
Answer» Atmospheric pressure is measured using:

Discussion

11931.	Explain velocity and displacement.
Answer» Explain velocity and displacement.

Discussion

11932.	Angstrom is a unit of___ .
Answer» Angstrom is a unit of___ .

Discussion

11933.	A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are γ1 and γ2 respectively. If their temperature is increased by ΔT, the fraction of the volume of metal submerged in mercury changes by a factor
Answer» A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are $γ_{1}$ and $γ_{2}$ respectively. If their temperature is increased by $Δ T$ , the fraction of the volume of metal submerged in mercury changes by a factor

Discussion

11934.	Does every change in energy of the body involve work
Answer» Does every change in energy of the body involve work

Discussion

11935.	Expression for the gravitational potential energy of an object at a height explain I can't understand
Answer» Expression for the gravitational potential energy of an object at a height explain I can't understand

Discussion

11936.	An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
Answer» An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

Discussion

11937.	A tennis ball bounces higher on hills than on planes. Which statement gives the correct reason-
Answer» A tennis ball bounces higher on hills than on planes. Which statement gives the correct reason-

Discussion

11938.	Harry is conducting his famous elevator experiments. Harry stands on a bathroom scale and reads the scale while ascending and descending John's building. Harry's mass is 80 kg. He notices that the scale readings depend on what the elevator is doing. What is the scale reading when Harry accelerates upward at 4.0 m/s2?(take g=10m/s2)
Answer» Harry is conducting his famous elevator experiments. Harry stands on a bathroom scale and reads the scale while ascending and descending John's building. Harry's mass is 80 kg. He notices that the scale readings depend on what the elevator is doing. What is the scale reading when Harry accelerates upward at 4.0 $m / s^{2}$ ?(take g=10 $m / s^{2}$ )

Discussion

11939.	The time period T of a simple pendulum is related to its length l as
Answer» The time period T of a simple pendulum is related to its length l as

Discussion

11940.	To reflect sound waves from any surface, it should have dimensions
Answer» To reflect sound waves from any surface, it should have dimensions

Discussion

11941.	If velocity (V), force(F) and time(t) are taken to be fundamental quantities and K is the dimensionless constant of proportionality, find the dimensional formula for mass.
Answer» If velocity (V), force(F) and time(t) are taken to be fundamental quantities and K is the dimensionless constant of proportionality, find the dimensional formula for mass.

Discussion

11942.	A body is brought near a negatively charged gold leaf electroscope. What conclusion is obtained about the charge on the body if the divergence of leaves remains unaffected?
Answer» A body is brought near a negatively charged gold leaf electroscope. What conclusion is obtained about the charge on the body if the divergence of leaves remains unaffected?

Discussion

11943.	The least count of an instrument is the ___ measurement that can be taken accurately with it.
Answer» The least count of an instrument is the ___ measurement that can be taken accurately with it.

Discussion

11944.	When we move we have a certain velocity. Newton had said that mass remains constant but if one derivates the equation dp/dt u get mdvdt+vdmdt people say mass is constant but by Special relativity M=m/sq.rt (1−v2c2) could you please explain this and also please explain if our mass changes and when we come back to rest what is that extra mass converted into?
Answer» When we move we have a certain velocity. Newton had said that mass remains constant but if one derivates the equation dp/dt u get $m \frac{d v}{d t} + v \frac{d m}{d t}$ people say mass is constant but by Special relativity M=m/sq.rt $(1 - \frac{v^{2}}{c^{2}})$ could you please explain this and also please explain if our mass changes and when we come back to rest what is that extra mass converted into?

Discussion

11945.	Which process is the source of energy of the stars? Name three common power plants. [2 MARKS]
Answer» Which process is the source of energy of the stars? Name three common power plants. [2 MARKS]

Discussion

11946.	How is value of G determined as 6.67*10-11?
Answer» How is value of G determined as 6.67*10^-11_?

Discussion

11947.	Which element made a brilliant mirror when it is painted on glass
Answer» Which element made a brilliant mirror when it is painted on glass

Discussion

11948.	On decreasing the height of a satellite its time period will increase or decrease?
Answer» On decreasing the height of a satellite its time period will increase or decrease?

Discussion

11949.	Consider a rectangular plate of dimensions a×b. If the plate is considered to be made up of four rectangles of dimensions a2×b2 and we now remove one (the lower right) out of the four rectangles, find the position where the centre of mass of the remaining system will be (considering the center of the rectangular plate as the origin)
Answer» Consider a rectangular plate of dimensions $a \times b$ . If the plate is considered to be made up of four rectangles of dimensions $\frac{a}{2} \times \frac{b}{2}$ and we now remove one (the lower right) out of the four rectangles, find the position where the centre of mass of the remaining system will be (considering the center of the rectangular plate as the origin)

Discussion

11950.	Please explain why Speed (V)=Wavelength (λ)× Frequency(v) or how to derive it.
Answer» Please explain why Speed (V)=Wavelength (λ)× Frequency(v) or how to derive it.

Discussion

Explore topic-wise InterviewSolutions in .

The value of the universal gravitational constant is .

Forces F1 and F2 are acting on a body in opposite directions. The body displaces by 's' metres in the direction of force F2. What is the total work done on the body?

Newton's Third Law states that every action has an equal an opposite reaction. If a massive truck is parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal force cancel each other. Comment on this statement. [3 MARKS]

Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in the opposite direction. The block moves a distance of 6.5 m in the same direction in which Vijay is pulling it. The work done on the block is:

A rocket is moving up with velocity v. If the velocity of the rocket is tripled, what will be the ratio of kinetic energies? [2 MARKS]

The mass of a body on earth is 60 kg, its mass on moon is

A nucleus AZX going through a β+ decay will end up taking what configuration?

Pick out the option which is not an application of Archimedes principle.

Which of the following uses multiple reflections of sound?

A body starting with initial velocity u moves with a constant accelearation a. Find the expression for distance travelled in nth second. A body was dropped from a very high building, calculate its distance travelled in 5th second. [5 MARKS]

Question 10 Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is :

Figure Shows the graph of velocity versus time for a particuler going along the X-axis. Find (a) The aceleration, (b) The distance reavelled in 0 to 10 s and (c) The displacement in 0 to 10 s.

Two objects, each of mass 1.0 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. they sticked together after collision. What will be the velocity of the combined object after collision?

Starting from rest at the top of an inclined plane a body reaches the bottom in 4 seconds. In what time does the body cover one-fourth the distance starting from the top?

Which of the following images represent the refraction of light?

Mohan jokes from one and a to the another and b of a straight 300m road in 2 minutes 30 seconds and then he turns around and start jogs hundred metre back to the point c in 1 minute what are Mohan's average speed and average velocity in jogging 1. From A to B 2. From A to C

A force of 10 N is applied to two bodies of different masses. Body 1 has mass, M1=10kg and body 2 has mass, M2=15kg. What is the ratio of the accelerations of bodies 1 and 2?

What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :

A body moving with a constant acceleration travels the distances 3 m and 8 m repsectively in 1 s and 2 s.Calculate: (i) the initial velocity ,and (ii) the acceleration of body.

A ball thrown up vertically returns to the thrower after 6 s. Find the position of the ball after 4 s. (Take acceleration due to gravity as 9.8 ms−2)

length of a conducting wire is increased by 100% by stretching it.the change in the resistance of the wire is?

A body has a weight of 10 kg on the surface of earth. What will be its weight when taken to the centre of the earth ?

How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall ? (g = 10 m s−2)

Name the device which is used to address a small gathering of people.

State the volume changes observed when a given mass of water is heated from 0∘ to 10∘. Sketch a temperature-volume graph to show the behaviour.

Calculate the gravitation force between two bodies of mass 80kg and 1200kg kept seperated by a distance of 10m

Atmospheric pressure is measured using:

Explain velocity and displacement.

Angstrom is a unit of___ .

A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are γ1 and γ2 respectively. If their temperature is increased by ΔT, the fraction of the volume of metal submerged in mercury changes by a factor

Does every change in energy of the body involve work

Expression for the gravitational potential energy of an object at a height explain I can't understand

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

A tennis ball bounces higher on hills than on planes. Which statement gives the correct reason-

The time period T of a simple pendulum is related to its length l as

To reflect sound waves from any surface, it should have dimensions

If velocity (V), force(F) and time(t) are taken to be fundamental quantities and K is the dimensionless constant of proportionality, find the dimensional formula for mass.

A body is brought near a negatively charged gold leaf electroscope. What conclusion is obtained about the charge on the body if the divergence of leaves remains unaffected?

The least count of an instrument is the ___ measurement that can be taken accurately with it.

Which process is the source of energy of the stars? Name three common power plants. [2 MARKS]

How is value of G determined as 6.67*10-11?

Which element made a brilliant mirror when it is painted on glass

On decreasing the height of a satellite its time period will increase or decrease?

Please explain why Speed (V)=Wavelength (λ)× Frequency(v) or how to derive it.