13232 + Interview Questions in Physics Page 184 InterviewSolution

9151.	The internal diameter of the neck of the water bottle can be measured by
Answer» The internal diameter of the neck of the water bottle can be measured by

Discussion

9152.	A lead bullet of mass 2 Kg, travelling with a velocity of 20 m/s, comes to rest after penetrating 20m in a still target. Find the resistive force applied by the target and acceleration of the bullet.
Answer» A lead bullet of mass 2 Kg, travelling with a velocity of 20 m/s, comes to rest after penetrating 20m in a still target. Find the resistive force applied by the target and acceleration of the bullet.

Discussion

9153.	The magnetic field lines at the axis of the current-carrying solenoid are
Answer» The magnetic field lines at the axis of the current-carrying solenoid are

Discussion

9154.	A body is projected with a velocity of 30 m/s at an angle of 30∘ with the vertical. Find the maximum height reached.
Answer» A body is projected with a velocity of 30 m/s at an angle of $30^{\circ}$ with the vertical. Find the maximum height reached.

Discussion

9155.	If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why ?
Answer» If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why ?

Discussion

9156.	A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s−1. Find the magnitude of force.
Answer» A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m $s^{- 1}$ . Find the magnitude of force.

Discussion

9157.	An aeroplane leaves an airport and flies due north at a speed of 1,000km per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of 1,200km per hour. How far apart will be the two planes after 112 hours?
Answer» An aeroplane leaves an airport and flies due north at a speed of 1,000km per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of 1,200km per hour. How far apart will be the two planes after $1 \frac{1}{2}$ hours?

Discussion

9158.	Without actually calculating the speed, can you guess in which time interval is the body moving fastest?
Answer» Without actually calculating the speed, can you guess in which time interval is the body moving fastest?

Discussion

9159.	A hockey ball of mass 300 g travelling at 20 ms–1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms–1. Calculate the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.
Answer» A hockey ball of mass 300 g travelling at 20 ms^–1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms^–1. Calculate the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.

Discussion

9160.	The value of universal gravitational constant, G is:
Answer» The value of universal gravitational constant, $G$ is:

Discussion

9161.	The velocity-time graph of a particle of mass 50 g moving in a fixed direction. The force on the particle is
Answer» The velocity-time graph of a particle of mass 50 g moving in a fixed direction. The force on the particle is

Discussion

9162.	To observe and compare the pressure exerted by three different faces of a cuboid on sand, the following Cuboid is available to you: (A) Wooden cuboid of dimension 20 cm x 30 cm x 50 cm (B) Aluminium cuboid of dimension 3 cm x 6 cm x 12 cm (C) Iron cuboid of dimension 5 cm x 10 cm x 50 cm (D) Iron cuboid of dimension 20 cm x 30 cm x 15 cm The best choice from the practical point of view would be:
Answer» To observe and compare the pressure exerted by three different faces of a cuboid on sand, the following Cuboid is available to you: (A) Wooden cuboid of dimension 20 cm x 30 cm x 50 cm (B) Aluminium cuboid of dimension 3 cm x 6 cm x 12 cm (C) Iron cuboid of dimension 5 cm x 10 cm x 50 cm (D) Iron cuboid of dimension 20 cm x 30 cm x 15 cm The best choice from the practical point of view would be:

9162.

To observe and compare the pressure exerted by three different faces of a cuboid on sand, the following Cuboid is available to you: (A) Wooden cuboid of dimension 20 cm x 30 cm x 50 cm (B) Aluminium cuboid of dimension 3 cm x 6 cm x 12 cm (C) Iron cuboid of dimension 5 cm x 10 cm x 50 cm (D) Iron cuboid of dimension 20 cm x 30 cm x 15 cm The best choice from the practical point of view would be:

Answer»

To observe and compare the pressure exerted by three different faces of a cuboid on sand, the following Cuboid is available to you:

(A) Wooden cuboid of dimension 20 cm x 30 cm x 50 cm

(B) Aluminium cuboid of dimension 3 cm x 6 cm x 12 cm

(C) Iron cuboid of dimension 5 cm x 10 cm x 50 cm

(D) Iron cuboid of dimension 20 cm x 30 cm x 15 cm

The best choice from the practical point of view would be:

Discussion

9163.	A fluid exerts an upward force on a body immersed in it, which is called as ___.
Answer» A fluid exerts an upward force on a body immersed in it, which is called as ___.

Discussion

9164.	If a bus starts moving suddenly, the passengers inside the bus will tend to bend
Answer» If a bus starts moving suddenly, the passengers inside the bus will tend to bend

Discussion

9165.	A tuning fork has a number 256 marked on it. What does this number signify ?
Answer» A tuning fork has a number 256 marked on it. What does this number signify ?

Discussion

9166.	A force of 5N is applied on a body over a surface area of 5m2. Calculate the pressure applied to the surface.
Answer» A force of $5 N$ is applied on a body over a surface area of $5 m^{2}$ . Calculate the pressure applied to the surface.

Discussion

9167.	Two bodies A and B are having the same mass M. While the volume of body A is lesser than volume of body B. What is the relation between density of body A and body B. (Take density of body A=ρA and density of body B=ρb & volume of body A=VA and density of body B=VB )
Answer» Two bodies $A$ and $B$ are having the same mass $M$ . While the volume of body $A$ is lesser than volume of body $B$ . What is the relation between density of body $A$ and body $B$ . (Take density of body $A = ρ_{A}$ and density of body $B = ρ_{b}$ & volume of body $A = V_{A}$ and density of body $B = V_{B}$ )

Discussion

9168.	The value of quantity G in the formula for gravitational force : (a) depends on mass of the earth only (b) depends on the radius of earth only (c) depends on both mass and radius of earth, (d) depends neither on mass nor on radius of earth
Answer» The value of quantity G in the formula for gravitational force : (a) depends on mass of the earth only (b) depends on the radius of earth only (c) depends on both mass and radius of earth, (d) depends neither on mass nor on radius of earth

Discussion

9169.	What is the SI unit of the coefficient of thermal conductivity?
Answer» What is the SI unit of the coefficient of thermal conductivity?

Discussion

9170.	An iron ring measuring 15.00 cm in diameter is to be shrunk on a pulley which is 15.05 cm in diameter. All measurements are done at a room temperature of 20∘C. To what minimum temperature should the ring be heated to make the job possible? Calculate the strain developed in the ring when it comes to the room temperature. Coefficient of linear expansion of iron = 12 × 10−6/∘C.
Answer» An iron ring measuring $15.00 c m$ in diameter is to be shrunk on a pulley which is $15.05 c m$ in diameter. All measurements are done at a room temperature of $20^{\circ} C$ . To what minimum temperature should the ring be heated to make the job possible? Calculate the strain developed in the ring when it comes to the room temperature. Coefficient of linear expansion of iron = $12 \times 10^{- 6} /^{\circ} C$ .

Discussion

9171.	The atmosphere consisting of a large number of gases is held to the earth by : (a) winds (b) clouds (c) earth's magnetic field (d) gravity
Answer» The atmosphere consisting of a large number of gases is held to the earth by : (a) winds (b) clouds (c) earth's magnetic field (d) gravity

Discussion

9172.	If a ship is made underwater then will it come up to the surface after it is completed
Answer» If a ship is made underwater then will it come up to the surface after it is completed

Discussion

9173.	A combination of a movable pulley P1 with a fixed pulley P2 is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.
Answer» A combination of a movable pulley $P_{1}$ with a fixed pulley $P_{2}$ is used for lifting up a load W. If the free end of the string moves through a distance $x$ , find the distance by which the load W is raised.

Discussion

9174.	A man of mass 60 kg can throw a stone of mass 1 kg upto a height of 5 m. If he is standing on ice skates of negligible mass, the maximum velocity that he can generate in same stone, if he throws it with same force in the horizontal direction is
Answer» A man of mass 60 kg can throw a stone of mass 1 kg upto a height of 5 m. If he is standing on ice skates of negligible mass, the maximum velocity that he can generate in same stone, if he throws it with same force in the horizontal direction is

Discussion

9175.	Calculate the decrease in the kinetic energy of a moving body if it's velocity reduces to (1/3rd) of initial velocity.
Answer» Calculate the decrease in the kinetic energy of a moving body if it's velocity reduces to (1/3rd) of initial velocity.

Discussion

9176.	A satellite gets unstable in its orbit and starts to fall towards earth and also starts burning. If the satellite had a potential energy of 1000 J initially and by the time it reaches the surface of the earth it attains a kinetic energy of 500 J, then how much energy is spent in heating the satellite?
Answer» A satellite gets unstable in its orbit and starts to fall towards earth and also starts burning. If the satellite had a potential energy of 1000 J initially and by the time it reaches the surface of the earth it attains a kinetic energy of 500 J, then how much energy is spent in heating the satellite?

Discussion

9177.	The maximum displacement of the bob from the mean position is called the ___ of the oscillation.
Answer» The maximum displacement of the bob from the mean position is called the ___ of the oscillation.

Discussion

9178.	Easy derivation of kinetic energy
Answer» Easy derivation of kinetic energy

Discussion

9179.	According to Newton's law of gravitation,earth's gravitational force is higher on an object of larger mass why doesn't that object fall down with higher velocity as compared to an object with lower mass?
Answer» According to Newton's law of gravitation,earth's gravitational force is higher on an object of larger mass why doesn't that object fall down with higher velocity as compared to an object with lower mass?

Discussion

9180.	Question 4 A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms−2 for 8.0 s. How far does the boat travel during this time?
Answer» Question 4 A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0 m s^{- 2}$ for $8.0 s$ . How far does the boat travel during this time?

Discussion

9181.	If the Zero error of a Vernier Caliper is zero, then
Answer» If the Zero error of a Vernier Caliper is zero, then

Discussion

9182.	If the displacement of a body is directly proportional to square of time, the object moves with a) uniform velocity b) uniform acceleration c) increasing acceleration d) decreasing acceleration Please tell the correct option and explain
Answer» If the displacement of a body is directly proportional to square of time, the object moves with a) uniform velocity b) uniform acceleration c) increasing acceleration d) decreasing acceleration Please tell the correct option and explain

Discussion

9183.	Why we cannot store the light when the lighting falls on batteries ? Why we cannot took too large volt batteries for this purpose
Answer» Why we cannot store the light when the lighting falls on batteries ? Why we cannot took too large volt batteries for this purpose

9183.

Why we cannot store the light when the lighting falls on batteries ? Why we cannot took too large volt batteries for this purpose

Answer»

Why we cannot store the

light when the lighting falls on batteries ? Why we cannot took too large volt batteries for this purpose

Discussion

9184.	Give reasons: (A) A karate player suddenly reduces the speed of his hand while hitting a ice slab . (b) Glass ware are covered with paper and straw while transportation.
Answer» Give reasons: (A) A karate player suddenly reduces the speed of his hand while hitting a ice slab . (b) Glass ware are covered with paper and straw while transportation.

Discussion

9185.	Hydraulic brakes use
Answer» Hydraulic brakes use

Discussion

9186.	Which of the following is correct regarding wave ?
Answer» Which of the following is correct regarding wave ?

Discussion

9187.	An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object?
Answer» An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object?

Discussion

9188.	A car moves with a speed of 40 km/h for the first hour and then with a speed of 60 km/h for the next half hour and finally with a speed of 30 km/h for the next 1.5 hours. Calculate the average speed of the car. [2 MARKS]
Answer» A car moves with a speed of 40 km/h for the first hour and then with a speed of 60 km/h for the next half hour and finally with a speed of 30 km/h for the next 1.5 hours. Calculate the average speed of the car. [2 MARKS]

Discussion

9189.	What is the velocity of recoil of a gun, if a bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity fo 100 ms–1?
Answer» What is the velocity of recoil of a gun, if a bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity fo 100 ms^–1?

Discussion

9190.	The density of a linear rod of length L varies as ρ = A + Bx where x is the distance from the left end. Locate the centre of mass.
Answer» The density of a linear rod of length L varies as $ρ$ = A + Bx where x is the distance from the left end. Locate the centre of mass.

9190.

The density of a linear rod of length L varies as ρ = A + Bx where x is the distance from the left end. Locate the centre of mass.

Answer»

The density of a linear rod of length L varies as
$ρ$ = A + Bx where x is the distance from the left end.
Locate the centre of mass.

Discussion

9191.	Ram and Shyam are climbing a tree. Ram weighs 50 kg and Shyam weighs 60 kg. Power spent by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and Shyam to climb the tree?
Answer» Ram and Shyam are climbing a tree. Ram weighs $50 kg$ and Shyam weighs $60 kg$ . Power spent by Ram and Shyam to climb the tree are in the ratio of $3 : 2$ . What is the ratio of time taken by Ram and Shyam to climb the tree?

Discussion

9192.	A car of mass 1,000 kg is moving at a speed of 20 ms−1. It is brought to rest at a distance of 50 m. Calculate the net force acting on the car.
Answer» A car of mass $1, 000 k g$ is moving at a speed of $20 m s^{- 1}$ . It is brought to rest at a distance of $50 m$ . Calculate the net force acting on the car.

Discussion

9193.	If a spring is stretched, what is the work done by the stretching force?
Answer» If a spring is stretched, what is the work done by the stretching force?

Discussion

9194.	What is linear momemtum?
Answer» What is linear momemtum?

Discussion

9195.	A ray of light is incident on medium 1 with a refractive index of 1 from a medium 2 with a refractive index of √2. Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).
Answer» A ray of light is incident on medium 1 with a refractive index of 1 from a medium 2 with a refractive index of $\sqrt{2}$ . Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).

9195.

A ray of light is incident on medium 1 with a refractive index of 1 from a medium 2 with a refractive index of √2. Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).

Answer»

A ray of light is incident on medium 1 with a refractive index of 1 from a medium 2 with a refractive index of $\sqrt{2}$ . Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).

Discussion

9196.	Question 3 The kinetic energy of an object of mass, m moving with a velocity of 5ms−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
Answer» Question 3 The kinetic energy of an object of mass, m moving with a velocity of $5 m s^{- 1}$ is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Discussion

9197.	In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?
Answer» In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

9197.

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

Answer»

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

Discussion

9198.	___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful energy.
Answer» ___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful energy.

Discussion

9199.	what does the slope of speed-time graph indicates?
Answer» what does the slope of speed-time graph indicates?

Discussion

9200.	why dont the walls of buildings crack even when the supporting metal rods expand and contract due to temperature changes?....my question is of class 8..
Answer» why dont the walls of buildings crack even when the supporting metal rods expand and contract due to temperature changes?....my question is of class 8..

Discussion

Explore topic-wise InterviewSolutions in .

The internal diameter of the neck of the water bottle can be measured by

A lead bullet of mass 2 Kg, travelling with a velocity of 20 m/s, comes to rest after penetrating 20m in a still target. Find the resistive force applied by the target and acceleration of the bullet.

The magnetic field lines at the axis of the current-carrying solenoid are

A body is projected with a velocity of 30 m/s at an angle of 30∘ with the vertical. Find the maximum height reached.

If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why ?

A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s−1. Find the magnitude of force.

An aeroplane leaves an airport and flies due north at a speed of 1,000km per hour. At the same time, another aeroplane leaves the same airport and flies due west at a speed of 1,200km per hour. How far apart will be the two planes after 112 hours?

Without actually calculating the speed, can you guess in which time interval is the body moving fastest?

A hockey ball of mass 300 g travelling at 20 ms–1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms–1. Calculate the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.

The value of universal gravitational constant, G is:

The velocity-time graph of a particle of mass 50 g moving in a fixed direction. The force on the particle is

A fluid exerts an upward force on a body immersed in it, which is called as ___.

If a bus starts moving suddenly, the passengers inside the bus will tend to bend

A tuning fork has a number 256 marked on it. What does this number signify ?

A force of 5N is applied on a body over a surface area of 5m2. Calculate the pressure applied to the surface.

Two bodies A and B are having the same mass M. While the volume of body A is lesser than volume of body B. What is the relation between density of body A and body B. (Take density of body A=ρA and density of body B=ρb &amp; volume of body A=VA and density of body B=VB )

The value of quantity G in the formula for gravitational force : (a) depends on mass of the earth only (b) depends on the radius of earth only (c) depends on both mass and radius of earth, (d) depends neither on mass nor on radius of earth

What is the SI unit of the coefficient of thermal conductivity?

The atmosphere consisting of a large number of gases is held to the earth by : (a) winds (b) clouds (c) earth's magnetic field (d) gravity

If a ship is made underwater then will it come up to the surface after it is completed

A combination of a movable pulley P1​ with a fixed pulley P2​ is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.

A man of mass 60 kg can throw a stone of mass 1 kg upto a height of 5 m. If he is standing on ice skates of negligible mass, the maximum velocity that he can generate in same stone, if he throws it with same force in the horizontal direction is

Calculate the decrease in the kinetic energy of a moving body if it's velocity reduces to (1/3rd) of initial velocity.

The maximum displacement of the bob from the mean position is called the ___ of the oscillation.

Easy derivation of kinetic energy

According to Newton's law of gravitation,earth's gravitational force is higher on an object of larger mass why doesn't that object fall down with higher velocity as compared to an object with lower mass?

Question 4 A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms−2 for 8.0 s. How far does the boat travel during this time?

If the Zero error of a Vernier Caliper is zero, then

If the displacement of a body is directly proportional to square of time, the object moves with a) uniform velocity b) uniform acceleration c) increasing acceleration d) decreasing acceleration Please tell the correct option and explain

Why we cannot store the light when the lighting falls on batteries ? Why we cannot took too large volt batteries for this purpose

Give reasons: (A) A karate player suddenly reduces the speed of his hand while hitting a ice slab . (b) Glass ware are covered with paper and straw while transportation.

Hydraulic brakes use

Which of the following is correct regarding wave ?

An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object?

A car moves with a speed of 40 km/h for the first hour and then with a speed of 60 km/h for the next half hour and finally with a speed of 30 km/h for the next 1.5 hours. Calculate the average speed of the car. [2 MARKS]

What is the velocity of recoil of a gun, if a bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity fo 100 ms–1?

The density of a linear rod of length L varies as ρ = A + Bx where x is the distance from the left end. Locate the centre of mass.

Ram and Shyam are climbing a tree. Ram weighs 50 kg and Shyam weighs 60 kg. Power spent by Ram and Shyam to climb the tree are in the ratio of 3:2. What is the ratio of time taken by Ram and Shyam to climb the tree?

A car of mass 1,000 kg is moving at a speed of 20 ms−1. It is brought to rest at a distance of 50 m. Calculate the net force acting on the car.

If a spring is stretched, what is the work done by the stretching force?

What is linear momemtum?

A ray of light is incident on medium 1 with a refractive index of 1 from a medium 2 with a refractive index of √2. Find the deviation of the emergent ray in the given diagram (with respect to first incident ray).

Question 3 The kinetic energy of an object of mass, m moving with a velocity of 5ms−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

In the given figure, if we immerse the block into the water then what will happen to the reading on the spring balance?

___ is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful energy.

what does the slope of speed-time graph indicates?

why dont the walls of buildings crack even when the supporting metal rods expand and contract due to temperature changes?....my question is of class 8..

Two bodies A and B are having the same mass M. While the volume of body A is lesser than volume of body B. What is the relation between density of body A and body B. (Take density of body A=ρA and density of body B=ρb & volume of body A=VA and density of body B=VB )

A combination of a movable pulley P1 with a fixed pulley P2 is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.