13232 + Interview Questions in Physics Page 264 InterviewSolution

13151.	What is ultrasound ?
Answer» What is ultrasound ?

Discussion

13152.	Electrons move at speed of about 1 mm/s. Then how does the light turn on as soon as we switch it on?
Answer» Electrons move at speed of about 1 mm/s. Then how does the light turn on as soon as we switch it on?

Discussion

13153.	What social initiatives must be taken for the sensitive use of energy ?
Answer» What social initiatives must be taken for the sensitive use of energy ?

Discussion

13154.	What happens to the kinetic energy of a weight, attached to a spring which oscillates when it is pulled down and released?
Answer» What happens to the kinetic energy of a weight, attached to a spring which oscillates when it is pulled down and released?

Discussion

13155.	Ram soaked 8g of raisins in water and after 4 hours found that their mass has been 12g . Determine the percentage of water absorbed by raisins.
Answer» Ram soaked 8g of raisins in water and after 4 hours found that their mass has been 12g . Determine the percentage of water absorbed by raisins.

Discussion

13156.	How momentum will an object of mass 10 kg transfer to the floor, if it falls from a height of 5m.
Answer» How momentum will an object of mass 10 kg transfer to the floor, if it falls from a height of 5m.

Discussion

13157.	A stone is dropped into a well 44m deep and the sound of splash is heard after 3.12sec. find the speed of sound in air (g=9.8m per sec)
Answer» A stone is dropped into a well 44m deep and the sound of splash is heard after 3.12sec. find the speed of sound in air (g=9.8m per sec)

Discussion

13158.	Area under velocity-time graph depicts a physical quantity that has the unit _____.
Answer» Area under velocity-time graph depicts a physical quantity that has the unit _____.

Discussion

13159.	An oil tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)
Answer» An oil tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)

Discussion

13160.	Are motion and rest relative terms? Please give one example.
Answer» Are motion and rest relative terms? Please give one example.

Discussion

13161.	A ball is dropped from a pole of height 100m and simultaneously a stone is thrown upwards, they meet at a point 55m above the ground. The velocity with which the stone must be thrown should equal to
Answer» A ball is dropped from a pole of height 100m and simultaneously a stone is thrown upwards, they meet at a point 55m above the ground. The velocity with which the stone must be thrown should equal to

Discussion

13162.	An astronaut jumps from an airplane. After he has fallen 20 m, his parachute opens. Now he falls with a retardation of 2 m/s2 and reaches the earth with a velocity of 4.0 m/s. What was the initial height of the airplane? Take „g‟ as 10 m/s2.
Answer» An astronaut jumps from an airplane. After he has fallen 20 m, his parachute opens. Now he falls with a retardation of 2 m/s2 and reaches the earth with a velocity of 4.0 m/s. What was the initial height of the airplane? Take „g‟ as 10 m/s2.

Discussion

13163.	Give some examples of uniform accelerated motion?
Answer» Give some examples of uniform accelerated motion?

Discussion

13164.	A car is moving with a velocity of 40 m/s. The brakes are applied to retard it at a rate of 2 m/s^2. What will be its velocity after 5 s of applying the brakes?
Answer» A car is moving with a velocity of 40 m/s. The brakes are applied to retard it at a rate of 2 m/s^2. What will be its velocity after 5 s of applying the brakes?

Discussion

13165.	Question 7: A body of weing W is suspended from the ceiling of a room through a rope of weight R. the ceiling pulls the rope by a force of
Answer» Question 7: A body of weing W is suspended from the ceiling of a room through a rope of weight R. the ceiling pulls the rope by a force of

Discussion

13166.	What is work and energy? what is the difference between them?
Answer» What is work and energy? what is the difference between them?

Discussion

13167.	There is a small hole near the bottom of an open tank filled with liquid. The speed of the water ejected does not depend on:
Answer» There is a small hole near the bottom of an open tank filled with liquid. The speed of the water ejected does not depend on:

Discussion

13168.	Which criterion is being used to classify the three types of lever?
Answer» Which criterion is being used to classify the three types of lever?

Discussion

13169.	A car remains at a distance of 20m from a tree. Which of the following is possible?
Answer» A car remains at a distance of 20m from a tree. Which of the following is possible?

Discussion

13170.	Weight of a body on earth is 48 N; its weight on moon is
Answer» Weight of a body on earth is 48 N; its weight on moon is

Discussion

13171.	Two samples, each containing 400 g of water, are mixed. The temperature of sample A before mixing was 20∘C and that of sample B was 65∘C. What will be the final temperature of the mixture? (Specific heat of water = 4186 J/kg K)
Answer» Two samples, each containing $400 g$ of water, are mixed. The temperature of sample A before mixing was $20^{\circ} C$ and that of sample B was $65^{\circ} C$ . What will be the final temperature of the mixture? (Specific heat of water = 4186 J/kg K)

Discussion

13172.	A boy climbs on to a wall that is 3.4 m high and gains 2250 J of potential energy. What is the mass of the boy? Take g = 9.8 m/Sec2
Answer» A boy climbs on to a wall that is 3.4 m high and gains 2250 J of potential energy. What is the mass of the boy? Take g = 9.8 m/Sec²

Discussion

13173.	Calculate the amount of heat required to vapourise 2 kg of water at 100∘C, for which the latent heat of vapourisation is 2260 kJ/kg.
Answer» Calculate the amount of heat required to vapourise $2 k g$ of water at $100^{\circ} C$ , for which the latent heat of vapourisation is $2260 k J / k g$ .

Discussion

13174.	Using the graph, calculate the total displacement of the motor cycle.
Answer» Using the graph, calculate the total displacement of the motor cycle.

Discussion

13175.	A block of wood just floats in water. If the water is heated, the block will
Answer» A block of wood just floats in water. If the water is heated, the block will

Discussion

13176.	A man is standing at a distance of 12 m from a cliff. Will be he able to hear a clear echo of his sound ? Give a reason for your answer.
Answer» A man is standing at a distance of 12 m from a cliff. Will be he able to hear a clear echo of his sound ? Give a reason for your answer.

Discussion

13177.	A geosynchronous satellite is a satellite that orbits the earth with an orbital period of 24 hours, thus matching the period of the earth's rotational motion. A special class of geosynchronous satellites is a geostationary satellite. A geostationary satellite orbits the earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. If a geostationary satellite wishes to orbit the earth in 24 hours (86400 s), then how high above the earth's surface must it be located? (Given: Mearth=5.98×1024kg,Rearth=6.37×106m)
Answer» A geosynchronous satellite is a satellite that orbits the earth with an orbital period of 24 hours, thus matching the period of the earth's rotational motion. A special class of geosynchronous satellites is a geostationary satellite. A geostationary satellite orbits the earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. If a geostationary satellite wishes to orbit the earth in 24 hours (86400 s), then how high above the earth's surface must it be located? (Given: $M_{e a r t h} = 5.98 \times 10^{24} k g, R_{e a r t h} = 6.37 \times 10^{6} m$ )

13177.

A geosynchronous satellite is a satellite that orbits the earth with an orbital period of 24 hours, thus matching the period of the earth's rotational motion. A special class of geosynchronous satellites is a geostationary satellite. A geostationary satellite orbits the earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. If a geostationary satellite wishes to orbit the earth in 24 hours (86400 s), then how high above the earth's surface must it be located? (Given: Mearth=5.98×1024kg,Rearth=6.37×106m)

Answer»

A geosynchronous satellite is a satellite that orbits the earth with an orbital period of 24 hours, thus matching the period of the earth's rotational motion. A special class of geosynchronous satellites is a geostationary satellite. A geostationary satellite orbits the earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. If a geostationary satellite wishes to orbit the earth in 24 hours (86400 s), then how high above the earth's surface must it be located? (Given: $M_{e a r t h} = 5.98 \times 10^{24} k g, R_{e a r t h} = 6.37 \times 10^{6} m$ )

Discussion

13178.	A body having 5kg mass is traveling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?
Answer» A body having $5 k g$ mass is traveling with a certain velocity and has $10 k g m / s$ momentum. What will be its kinetic energy?

Discussion

13179.	Steering of a car with two hands on either side of the steering wheel involves how many forces on the steering wheel?
Answer» Steering of a car with two hands on either side of the steering wheel involves how many forces on the steering wheel?

Discussion

13180.	Three slabs are arranged one over the other, as shown in the image. The optical density of the slabs 1, 2 and 3 are a, b, and c respectively. Based on the path of the light, determine the relationship between the optical density of the three slabs.
Answer» Three slabs are arranged one over the other, as shown in the image. The optical density of the slabs 1, 2 and 3 are a, b, and c respectively. Based on the path of the light, determine the relationship between the optical density of the three slabs.

Discussion

13181.	Two balls are dropped from the same height at 1-second interval of time. The separation between the two balls after 3 seconds of the drop of the first ball is:
Answer» Two balls are dropped from the same height at 1-second interval of time. The separation between the two balls after 3 seconds of the drop of the first ball is:

Discussion

13182.	What is Rayleigh wave
Answer» What is Rayleigh wave

Discussion

13183.	2 plastic balls have masses of 100 g and 200 g. The 100 g ball is moving at 3 ms−1 and hits the 200 g stationary ball. They collide with each other and after the collision, the 100 g ball moves with a velocity of 1.5 ms−1 in the same direction. Calculate the velocity of the other ball after collision.
Answer» 2 plastic balls have masses of $100 g$ and $200 g$ . The $100 g$ ball is moving at $3 m s^{- 1}$ and hits the $200 g$ stationary ball. They collide with each other and after the collision, the $100 g$ ball moves with a velocity of $1.5 m s^{- 1}$ in the same direction. Calculate the velocity of the other ball after collision.

Discussion

13184.	To increase the effective resistance in a circuit the resistors are connected in?
Answer» To increase the effective resistance in a circuit the resistors are connected in?

Discussion

13185.	A 60 m long train moving on a straight level track passes a pole in 5 seconds, find the speed of the train and the time it will take to cross a 540 long bridge.
Answer» A 60 m long train moving on a straight level track passes a pole in 5 seconds, find the speed of the train and the time it will take to cross a 540 long bridge.

Discussion

13186.	What is the working principle of an electrical fuse?
Answer» What is the working principle of an electrical fuse?

Discussion

13187.	Is it possible that a body be in accelerated motion under a force acting on a body, yet no work is being done by the force?
Answer» Is it possible that a body be in accelerated motion under a force acting on a body, yet no work is being done by the force?

Discussion

13188.	Question 14 A sound wave travels at a speed of 339ms−1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
Answer» Question 14 A sound wave travels at a speed of $339 m s^{- 1}$ . If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Discussion

13189.	A light ray behaves as ______.
Answer» A light ray behaves as ______.

Discussion

13190.	A train and a car travelling with the same kinetic energy, are brought to rest by applying the same force. Which object will travel more distance before coming to rest?
Answer» A train and a car travelling with the same kinetic energy, are brought to rest by applying the same force. Which object will travel more distance before coming to rest?

Discussion

13191.	A light ray passing through the optic centre of a convex lens will pass through ___ after refraction.
Answer» A light ray passing through the optic centre of a convex lens will pass through ___ after refraction.

Discussion

13192.	A solid of relative density 1.25 is found to weigh 12 g in water. Find its weight in air.
Answer» A solid of relative density 1.25 is found to weigh 12 g in water. Find its weight in air.

Discussion

13193.	A person carrying a bag of total mass 25 kg climbs up to height of 5 m in 30 seconds slowly. The power delivered for carrying the bag is-
Answer» A person carrying a bag of total mass 25 kg climbs up to height of 5 m in 30 seconds slowly. The power delivered for carrying the bag is-

Discussion

13194.	A vehicle is accelerating on a staright road.Its velocity at any instant is 30 km h−1,after 2 s, it is 33.6 km h−1 and after further 2 s, it is 37.2 km h−1. Find the acceleration of vehicle in m s−2. Is the accleration uniform?
Answer» A vehicle is accelerating on a staright road.Its velocity at any instant is 30 $k m h^{- 1}$ ,after 2 s, it is 33.6 $k m h^{- 1}$ and after further 2 s, it is 37.2 $k m h^{- 1}$ . Find the acceleration of vehicle in $m s^{- 2}$ . Is the accleration uniform?

Discussion

13195.	What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?
Answer» What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

13195.

What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

Answer»

What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

Discussion

13196.	The average amount of Solar energy reaching the upper atmosphere of earth per second on an area of 1 m2 is called ___.
Answer» The average amount of Solar energy reaching the upper atmosphere of earth per second on an area of $1 m^{2}$ is called ___.

Discussion

13197.	A 100 kg block is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. If the same experiment is carried out in vacuum inside an adiabatic chamber, the change in internal energy of the belt-block system will be -
Answer» A 100 kg block is started with a speed of $2.0 m s^{- 1}$ on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. If the same experiment is carried out in vacuum inside an adiabatic chamber, the change in internal energy of the belt-block system will be -

13197.

A 100 kg block is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. If the same experiment is carried out in vacuum inside an adiabatic chamber, the change in internal energy of the belt-block system will be -

Answer»

A 100 kg block is started with a speed of $2.0 m s^{- 1}$ on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20.

If the same experiment is carried out in vacuum inside an adiabatic chamber, the change in internal energy of the belt-block system will be -

Discussion

13198.	The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530
Answer» The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

13198.

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

Answer»

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ?

(a) 340 (b) 5170 (c) 1280 (d) 1530

Discussion

13199.	Question 43 In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, 1.00% of the alpha-particles were found to deflect at angles >50∘. If one mole of alpha-particles were bombarded on the gold foil, compute the number of alpha-particles that would deflect at angles less than 50∘.
Answer» Question 43 In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, $1.00 %$ of the alpha-particles were found to deflect at angles $> 50^{\circ}$ . If one mole of alpha-particles were bombarded on the gold foil, compute the number of alpha-particles that would deflect at angles less than $50^{\circ}$ .

Discussion

13200.	why the ice freezes from top while it melt from bottom
Answer» why the ice freezes from top while it melt from bottom

Discussion

Explore topic-wise InterviewSolutions in .

What is ultrasound ?

Electrons move at speed of about 1 mm/s. Then how does the light turn on as soon as we switch it on?

What social initiatives must be taken for the sensitive use of energy ?

What happens to the kinetic energy of a weight, attached to a spring which oscillates when it is pulled down and released?

Ram soaked 8g of raisins in water and after 4 hours found that their mass has been 12g . Determine the percentage of water absorbed by raisins.

How momentum will an object of mass 10 kg transfer to the floor, if it falls from a height of 5m.

A stone is dropped into a well 44m deep and the sound of splash is heard after 3.12sec. find the speed of sound in air (g=9.8m per sec)

Area under velocity-time graph depicts a physical quantity that has the unit _____.

Are motion and rest relative terms? Please give one example.

A ball is dropped from a pole of height 100m and simultaneously a stone is thrown upwards, they meet at a point 55m above the ground. The velocity with which the stone must be thrown should equal to

An astronaut jumps from an airplane. After he has fallen 20 m, his parachute opens. Now he falls with a retardation of 2 m/s2 and reaches the earth with a velocity of 4.0 m/s. What was the initial height of the airplane? Take „g‟ as 10 m/s2.

Give some examples of uniform accelerated motion?

A car is moving with a velocity of 40 m/s. The brakes are applied to retard it at a rate of 2 m/s^2. What will be its velocity after 5 s of applying the brakes?

Question 7: A body of weing W is suspended from the ceiling of a room through a rope of weight R. the ceiling pulls the rope by a force of

What is work and energy? what is the difference between them?

There is a small hole near the bottom of an open tank filled with liquid. The speed of the water ejected does not depend on:

Which criterion is being used to classify the three types of lever?

A car remains at a distance of 20m from a tree. Which of the following is possible?

Weight of a body on earth is 48 N; its weight on moon is

Two samples, each containing 400 g of water, are mixed. The temperature of sample A before mixing was 20∘C and that of sample B was 65∘C. What will be the final temperature of the mixture? (Specific heat of water = 4186 J/kg K)

A boy climbs on to a wall that is 3.4 m high and gains 2250 J of potential energy. What is the mass of the boy? Take g = 9.8 m/Sec2

Calculate the amount of heat required to vapourise 2 kg of water at 100∘C, for which the latent heat of vapourisation is 2260 kJ/kg.

Using the graph, calculate the total displacement of the motor cycle.

A block of wood just floats in water. If the water is heated, the block will

A man is standing at a distance of 12 m from a cliff. Will be he able to hear a clear echo of his sound ? Give a reason for your answer.

A body having 5kg mass is traveling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?

Steering of a car with two hands on either side of the steering wheel involves how many forces on the steering wheel?

Three slabs are arranged one over the other, as shown in the image. The optical density of the slabs 1, 2 and 3 are a, b, and c respectively. Based on the path of the light, determine the relationship between the optical density of the three slabs.

Two balls are dropped from the same height at 1-second interval of time. The separation between the two balls after 3 seconds of the drop of the first ball is:

What is Rayleigh wave

To increase the effective resistance in a circuit the resistors are connected in?

A 60 m long train moving on a straight level track passes a pole in 5 seconds, find the speed of the train and the time it will take to cross a 540 long bridge.

What is the working principle of an electrical fuse?

Is it possible that a body be in accelerated motion under a force acting on a body, yet no work is being done by the force?

Question 14 A sound wave travels at a speed of 339ms−1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

A light ray behaves as ______.

A train and a car travelling with the same kinetic energy, are brought to rest by applying the same force. Which object will travel more distance before coming to rest?

A light ray passing through the optic centre of a convex lens will pass through ___ after refraction.

A solid of relative density 1.25 is found to weigh 12 g in water. Find its weight in air.

A person carrying a bag of total mass 25 kg climbs up to height of 5 m in 30 seconds slowly. The power delivered for carrying the bag is-

A vehicle is accelerating on a staright road.Its velocity at any instant is 30 km h−1,after 2 s, it is 33.6 km h−1 and after further 2 s, it is 37.2 km h−1. Find the acceleration of vehicle in m s−2. Is the accleration uniform?

What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

The average amount of Solar energy reaching the upper atmosphere of earth per second on an area of 1 m2 is called ___.

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? (a) 340 (b) 5170 (c) 1280 (d) 1530

why the ice freezes from top while it melt from bottom