13232 + Interview Questions in Physics Page 203 InterviewSolution

10101.	With increase in temperature, viscosity of lubricating oil
Answer» With increase in temperature, viscosity of lubricating oil

Discussion

10102.	A ball of mass 5 kg moving at 3 m/s collides with another ball of mass 3 kg moving at 5 m/s in the same direction. If the balls move together after the collision in the same direction, find their common velocity.
Answer» A ball of mass 5 kg moving at 3 m/s collides with another ball of mass 3 kg moving at 5 m/s in the same direction. If the balls move together after the collision in the same direction, find their common velocity.

Discussion

10103.	Can matter be converted into energy? Explain.
Answer» Can matter be converted into energy? Explain.

Discussion

10104.	Is it possible to calculate the density of gas at standard temperature and pressure?
Answer» Is it possible to calculate the density of gas at standard temperature and pressure?

Discussion

10105.	A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:
Answer» A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s², the total distance covered before he stops is:

Discussion

10106.	Why some of the leaves may get detached from a tree if we vigorously shake its branch???????
Answer» Why some of the leaves may get detached from a tree if we vigorously shake its branch???????

Discussion

10107.	Two cubes of ice are pressed hard between the palms . When the pressure is released, the two cubes join together.Explain?
Answer» Two cubes of ice are pressed hard between the palms . When the pressure is released, the two cubes join together.Explain?

Discussion

10108.	Useful material obtained from petroleum and natural gas is known as:
Answer» Useful material obtained from petroleum and natural gas is known as:

Discussion

10109.	A boy weighing 350 N climbs up the 30 steps, each 20 cm high in 1 minute. Calculate:(i) the work is done, and (ii) the power spent.
Answer» A boy weighing 350 N climbs up the 30 steps, each 20 cm high in 1 minute. Calculate:(i) the work is done, and (ii) the power spent.

Discussion

10110.	Arrange the following speeds in increasing order (keeping the least speed first) : (i) An athlete running with a speed of 10ms (ii) A bicycle moving with a speed of 200 mmin (iii) A scooter moving with a speed of 30kmhr
Answer» Arrange the following speeds in increasing order (keeping the least speed first) : (i) An athlete running with a speed of 10 $\frac{m}{s}$ (ii) A bicycle moving with a speed of 200 $\frac{m}{m i n}$ (iii) A scooter moving with a speed of 30 $\frac{k m}{h r}$

10110.

Arrange the following speeds in increasing order (keeping the least speed first) : (i) An athlete running with a speed of 10ms (ii) A bicycle moving with a speed of 200 mmin (iii) A scooter moving with a speed of 30kmhr

Answer»

Arrange the following speeds in increasing order (keeping the least speed first) :

(i) An athlete running with a speed of 10 $\frac{m}{s}$

(ii) A bicycle moving with a speed of 200 $\frac{m}{m i n}$

(iii) A scooter moving with a speed of 30 $\frac{k m}{h r}$

Discussion

10111.	Derive the unit of force with the 2nd law of motion force of 5N produce an accelration of 24m/s^2 on a mass of m^2.What accelration to dothe same force provide the mass are tied together?
Answer» Derive the unit of force with the 2nd law of motion force of 5N produce an accelration of 24m/s^2 on a mass of m^2.What accelration to dothe same force provide the mass are tied together?

Discussion

10112.	If an elephant was chasing you, it's enormous mass would be most threatening. But if you moved in a zigzag path, it's big mass would become your advantage.why
Answer» If an elephant was chasing you, it's enormous mass would be most threatening. But if you moved in a zigzag path, it's big mass would become your advantage.why

Discussion

10113.	Why is the gravitational law called the universal law of gravitation?
Answer» Why is the gravitational law called the universal law of gravitation?

Discussion

10114.	A current of 1 A is drawn by a filament of an electric bulb. What will be the approximate number of electrons passing through a cross section of its filament in 16 seconds?
Answer» A current of $1 A$ is drawn by a filament of an electric bulb. What will be the approximate number of electrons passing through a cross section of its filament in 16 seconds?

Discussion

10115.	When an object is travelling almost at the speed of light, the mass of the object ______.
Answer» When an object is travelling almost at the speed of light, the mass of the object ______.

Discussion

10116.	Q. An object is at a height of 2 m, and another object is at a height of 5m. Which of them have higher potential energy? PS: It’s not about the height!
Answer» Q. An object is at a height of 2 m, and another object is at a height of 5m. Which of them have higher potential energy? PS: It’s not about the height!

Discussion

10117.	Why we are not crushed by the pressure created by a thick layer of atmosphere?
Answer» Why we are not crushed by the pressure created by a thick layer of atmosphere?

Discussion

10118.	The train A travelled a distance of 120km in 3 hr whereas another train B travelled a distance of 180km in 4 hr. Which train travelled faster?
Answer» The train A travelled a distance of 120km in 3 hr whereas another train B travelled a distance of 180km in 4 hr. Which train travelled faster?

Discussion

10119.	Is there a place on earth where law of gravitation doesn't work?
Answer» Is there a place on earth where law of gravitation doesn't work?

Discussion

10120.	When a body moves with a constant velocity, which of the following is/are correct about the motion?
Answer» When a body moves with a constant velocity, which of the following is/are correct about the motion?

Discussion

10121.	A 8000 kg engine pulls a train of 5 wagons ,each of 2000 kg , along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000 N , then calculate the force of wagon 1 and wagon 2
Answer» A 8000 kg engine pulls a train of 5 wagons ,each of 2000 kg , along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000 N , then calculate the force of wagon 1 and wagon 2

Discussion

10122.	Do mechanical waves lose energy as they travel through a medium? Why?
Answer» Do mechanical waves lose energy as they travel through a medium? Why?

Discussion

10123.	Find the acceleration due to gravity in a mine of depth 640 m if the value at the surface is 9.800 ms^{-2} . The radius of the earth is 6400 km.
Answer» Find the acceleration due to gravity in a mine of depth 640 m if the value at the surface is 9.800 ms^{-2} . The radius of the earth is 6400 km.

Discussion

10124.	How is the average velocity is calculated when its velocity changes at non uniform rate
Answer» How is the average velocity is calculated when its velocity changes at non uniform rate

Discussion

10125.	Mahibur is lost in the forest and is feeling very thirsty. But he finally finds a lake. So he dips the empty bottle into the lake but he is dumb enough to forget to remove the bottle cap. As he is is pushing the bottle more into the lake, he has to apply
Answer» Mahibur is lost in the forest and is feeling very thirsty. But he finally finds a lake. So he dips the empty bottle into the lake but he is dumb enough to forget to remove the bottle cap. As he is is pushing the bottle more into the lake, he has to apply

Discussion

10126.	For sound angle of reflection is always___angle of incidence.
Answer» For sound angle of reflection is always___angle of incidence.

Discussion

10127.	A body is thrown vertically upwards, Its velocity keeps on decreasing.What happens to its kinetic energy as its velocity becomes zero?
Answer» A body is thrown vertically upwards, Its velocity keeps on decreasing.What happens to its kinetic energy as its velocity becomes zero?

Discussion

10128.	The weight of a body at the centre of the earth is ___.
Answer» The weight of a body at the centre of the earth is ___.

Discussion

10129.	State two evidences of the existence of earth's magnetic field.
Answer» State two evidences of the existence of earth's magnetic field.

Discussion

10130.	If we throw a body upwards with velocity of 4ms−1 at what height its kinetic energy reduces to half its initial value ? Take g=10m/s2
Answer» If we throw a body upwards with velocity of $4 m s^{- 1}$ at what height its kinetic energy reduces to half its initial value ? Take $g = 10 m / s^{2}$

Discussion

10131.	An object is thrown vertically upwards with a velocity is \mu, the greatest height It to which it will rise before falling back is given by : (a) μ/g (b) μ2/2g (c) μ2/g (d) μ/2g
Answer» An object is thrown vertically upwards with a velocity is \mu, the greatest height It to which it will rise before falling back is given by : (a) $μ / g$ (b) $μ^{2} / 2 g$ (c) $μ^{2} / g$ (d) $μ / 2 g$

Discussion

10132.	What is the difference between connecting wires and insulated wire.
Answer» What is the difference between connecting wires and insulated wire.

Discussion

10133.	Which is more fundamental, the mass of a body or its weight ? Why ?
Answer» Which is more fundamental, the mass of a body or its weight ? Why ?

Discussion

10134.	Does the earth move towards an apple when it is dropped?
Answer» Does the earth move towards an apple when it is dropped?

Discussion

10135.	A uniform wire of lengthL is bent in the form of a circle. Then the shift of centre of mass is
Answer» A uniform wire of lengthL is bent in the form of a circle. Then the shift of centre of mass is

Discussion

10136.	The concept of recoil velocity of gun
Answer» The concept of recoil velocity of gun

Discussion

10137.	A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.
Answer» A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.

Discussion

10138.	What is buoyant force?
Answer» What is buoyant force?

Discussion

10139.	How does average velocity differ from instantaneous velocity? Explain with a velocity time graph.
Answer» How does average velocity differ from instantaneous velocity? Explain with a velocity time graph.

Discussion

10140.	The force that acts as the centripetal force that a planet requires to revolve around Sun is
Answer» The force that acts as the centripetal force that a planet requires to revolve around Sun is

Discussion

10141.	A toy car initially moving with a uniform velocity of 18 m h−1 comes to a stop in 2 s. Find the retardation of the car in S.I.units.
Answer» A toy car initially moving with a uniform velocity of $18 m h^{- 1}$ comes to a stop in 2 s. Find the retardation of the car in S.I.units.

Discussion

10142.	Question 102 The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas. Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?
Answer» Question 102 The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas. Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

10142.

Question 102 The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas. Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

Answer»

Question 102

The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas.

Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

Discussion

10143.	A boy was standing on a weighing scale in a lift, it showed a reading of 600 N. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the weighing scale?
Answer» A boy was standing on a weighing scale in a lift, it showed a reading of 600 N. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the weighing scale?

Discussion

10144.	Which of the following device is most efficient for the lighting purpose : LED, CFL, Fluorescent tube light, Electric bulb.
Answer» Which of the following device is most efficient for the lighting purpose : LED, CFL, Fluorescent tube light, Electric bulb.

10144.

Which of the following device is most efficient for the lighting purpose : LED, CFL, Fluorescent tube light, Electric bulb.

Answer»

Which of the following device is most efficient for the lighting purpose :

LED, CFL, Fluorescent tube light, Electric bulb.

Discussion

10145.	The most non-polluting and efficient lighting device is : (a) CFL (b) LED (c) Fluorescent light (d) Electric bulb.
Answer» The most non-polluting and efficient lighting device is : (a) CFL (b) LED (c) Fluorescent light (d) Electric bulb.

10145.

The most non-polluting and efficient lighting device is : (a) CFL (b) LED (c) Fluorescent light (d) Electric bulb.

Answer»

The most non-polluting and efficient lighting device is :

(a) CFL (b) LED

(c) Fluorescent light (d) Electric bulb.

Discussion

10146.	Two blocks A and B each of equal masses 'm' are released from the top of a smooth fixed wedge as shown in the figure. The magnitude of acceleration of the centre of mass of the two blocks is ___.
Answer» Two blocks A and B each of equal masses 'm' are released from the top of a smooth fixed wedge as shown in the figure. The magnitude of acceleration of the centre of mass of the two blocks is ___.

Discussion

10147.	The maximum speed of a train is 90 km/h . It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed.
Answer» The maximum speed of a train is 90 km/h . It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed.

10147.

The maximum speed of a train is 90 km/h . It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed.

Answer»

The maximum speed of a train is 90 km/h . It takes 10 hours to cover a distance of 500
km. Find the ratio of its average speed to maximum speed.

Discussion

10148.	The arm of an electric generator with split rings is rotated clockwise the deflection of the galvanometer will be:
Answer» The arm of an electric generator with split rings is rotated clockwise the deflection of the galvanometer will be:

Discussion

10149.	A car is moving in a straight line with speed 18 km h−1. It is stopped in 5 s by applying the brakes. Find: (i) the speed of car in m s−1, (ii) the retardation of car (iii) the speed of car after 2 s of applying the brakes.
Answer» A car is moving in a straight line with speed 18 km $h^{- 1}$ . It is stopped in 5 s by applying the brakes. Find: (i) the speed of car in m $s^{- 1}$ , (ii) the retardation of car (iii) the speed of car after 2 s of applying the brakes.

10149.

A car is moving in a straight line with speed 18 km h−1. It is stopped in 5 s by applying the brakes. Find: (i) the speed of car in m s−1, (ii) the retardation of car (iii) the speed of car after 2 s of applying the brakes.

Answer»

A car is moving in a straight line with speed 18 km $h^{- 1}$ . It is stopped in 5 s by applying the brakes. Find:

(i) the speed of car in m $s^{- 1}$ ,
(ii) the retardation of car
(iii) the speed of car after 2 s of applying the brakes.

Discussion

10150.	Which of the following gases is not a greenhouse gas?
Answer» Which of the following gases is not a greenhouse gas?

Discussion

Explore topic-wise InterviewSolutions in .

With increase in temperature, viscosity of lubricating oil

A ball of mass 5 kg moving at 3 m/s collides with another ball of mass 3 kg moving at 5 m/s in the same direction. If the balls move together after the collision in the same direction, find their common velocity.

Can matter be converted into energy? Explain.

Is it possible to calculate the density of gas at standard temperature and pressure?

A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:

Why some of the leaves may get detached from a tree if we vigorously shake its branch???????

Two cubes of ice are pressed hard between the palms . When the pressure is released, the two cubes join together.Explain?

Useful material obtained from petroleum and natural gas is known as:

A boy weighing 350 N climbs up the 30 steps, each 20 cm high in 1 minute. Calculate:(i) the work is done, and (ii) the power spent.

Arrange the following speeds in increasing order (keeping the least speed first) : (i) An athlete running with a speed of 10ms (ii) A bicycle moving with a speed of 200 mmin (iii) A scooter moving with a speed of 30kmhr

Derive the unit of force with the 2nd law of motion force of 5N produce an accelration of 24m/s^2 on a mass of m^2.What accelration to dothe same force provide the mass are tied together?

If an elephant was chasing you, it's enormous mass would be most threatening. But if you moved in a zigzag path, it's big mass would become your advantage.why

Why is the gravitational law called the universal law of gravitation?

A current of 1 A is drawn by a filament of an electric bulb. What will be the approximate number of electrons passing through a cross section of its filament in 16 seconds?

When an object is travelling almost at the speed of light, the mass of the object ______.

Q. An object is at a height of 2 m, and another object is at a height of 5m. Which of them have higher potential energy? PS: It’s not about the height!

Why we are not crushed by the pressure created by a thick layer of atmosphere?

The train A travelled a distance of 120km in 3 hr whereas another train B travelled a distance of 180km in 4 hr. Which train travelled faster?

Is there a place on earth where law of gravitation doesn't work?

When a body moves with a constant velocity, which of the following is/are correct about the motion?

A 8000 kg engine pulls a train of 5 wagons ,each of 2000 kg , along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000 N , then calculate the force of wagon 1 and wagon 2

Do mechanical waves lose energy as they travel through a medium? Why?

Find the acceleration due to gravity in a mine of depth 640 m if the value at the surface is 9.800 ms^{-2} . The radius of the earth is 6400 km.

How is the average velocity is calculated when its velocity changes at non uniform rate

Mahibur is lost in the forest and is feeling very thirsty. But he finally finds a lake. So he dips the empty bottle into the lake but he is dumb enough to forget to remove the bottle cap. As he is is pushing the bottle more into the lake, he has to apply

For sound angle of reflection is always___angle of incidence.

A body is thrown vertically upwards, Its velocity keeps on decreasing.What happens to its kinetic energy as its velocity becomes zero?

The weight of a body at the centre of the earth is ___.

State two evidences of the existence of earth's magnetic field.

If we throw a body upwards with velocity of 4ms−1 at what height its kinetic energy reduces to half its initial value ? Take g=10m/s2

An object is thrown vertically upwards with a velocity is \mu, the greatest height It to which it will rise before falling back is given by : (a) μ/g (b) μ2/2g (c) μ2/g (d) μ/2g

What is the difference between connecting wires and insulated wire.

Which is more fundamental, the mass of a body or its weight ? Why ?

Does the earth move towards an apple when it is dropped?

A uniform wire of lengthL is bent in the form of a circle. Then the shift of centre of mass is

The concept of recoil velocity of gun

A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.

What is buoyant force?

How does average velocity differ from instantaneous velocity? Explain with a velocity time graph.

The force that acts as the centripetal force that a planet requires to revolve around Sun is

A toy car initially moving with a uniform velocity of 18 m h−1 comes to a stop in 2 s. Find the retardation of the car in S.I.units.

Question 102 The folowing table shows the distance travelled by one of the new eco-friendly energy efficient car travelled on gas. Which type of properties are indicated by the table? How much distance will be covered by the car in 8 liters of gas?

A boy was standing on a weighing scale in a lift, it showed a reading of 600 N. The lift experienced a breakdown and started falling freely under the action of gravity, what would be the reading of the weighing scale?

Which of the following device is most efficient for the lighting purpose : LED, CFL, Fluorescent tube light, Electric bulb.

The most non-polluting and efficient lighting device is : (a) CFL (b) LED (c) Fluorescent light (d) Electric bulb.

Two blocks A and B each of equal masses 'm' are released from the top of a smooth fixed wedge as shown in the figure. The magnitude of acceleration of the centre of mass of the two blocks is ___.

The maximum speed of a train is 90 km/h . It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed.

The arm of an electric generator with split rings is rotated clockwise the deflection of the galvanometer will be:

A car is moving in a straight line with speed 18 km h−1. It is stopped in 5 s by applying the brakes. Find: (i) the speed of car in m s−1, (ii) the retardation of car (iii) the speed of car after 2 s of applying the brakes.

Which of the following gases is not a greenhouse gas?