13232 + Interview Questions in Physics Page 189 InterviewSolution

9401.	Amount of pressure of liquid increases with
Answer» Amount of pressure of liquid increases with

Discussion

9402.	Two points have a potential difference of 10V. After connecting a conductor with zero resistance between the points, the final potential at each point becomes 25V. What could be their initial potentials?
Answer» Two points have a potential difference of $10 V$ . After connecting a conductor with zero resistance between the points, the final potential at each point becomes $25 V$ . What could be their initial potentials?

Discussion

9403.	For the below figure, find the effective potential difference when the batteries are connected in series.
Answer» For the below figure, find the effective potential difference when the batteries are connected in series.

Discussion

9404.	Give one example of a body that has potential energy, in each of the following : (a) due to its position at a height, (b) due to its elongated stretched state.
Answer» Give one example of a body that has potential energy, in each of the following : (a) due to its position at a height, (b) due to its elongated stretched state.

9404.

Give one example of a body that has potential energy, in each of the following : (a) due to its position at a height, (b) due to its elongated stretched state.

Answer»

Give one example of a body that has potential energy, in each of the following :

(a) due to its position at a height,

(b) due to its elongated stretched state.

Discussion

9405.	The given figure shows an arrangement of moving pulleys. If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?
Answer» The given figure shows an arrangement of moving pulleys. If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?

9405.

The given figure shows an arrangement of moving pulleys. If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?

Answer»

The given figure shows an arrangement of moving pulleys.

If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?

Discussion

9406.	Use the following information to answer the next question. Akbar has three uncharged metal spheres made up of the same material. He places them in a row, in contact with one another. Then, he brings a negatively-charged metal sphere near one of the spheres. As a result, all the three spheres become charged. Which of the following diagrams shows the charge distribution on the three spheres?
Answer» Use the following information to answer the next question. Akbar has three uncharged metal spheres made up of the same material. He places them in a row, in contact with one another. Then, he brings a negatively-charged metal sphere near one of the spheres. As a result, all the three spheres become charged. Which of the following diagrams shows the charge distribution on the three spheres?

9406.

Use the following information to answer the next question. Akbar has three uncharged metal spheres made up of the same material. He places them in a row, in contact with one another. Then, he brings a negatively-charged metal sphere near one of the spheres. As a result, all the three spheres become charged. Which of the following diagrams shows the charge distribution on the three spheres?

Answer»

Use the following information to answer the next question.

Akbar has three uncharged metal spheres made up of the same material. He places them in a row, in contact with one another. Then, he brings a negatively-charged metal sphere near one of the spheres. As a result, all the three spheres become charged.

Which of the following diagrams shows the charge distribution on the three spheres?

Discussion

9407.	What is faster ,speed of light or speed of expansion of the universe?
Answer» What is faster ,speed of light or speed of expansion of the universe?

Discussion

9408.	There is a bar in my hand. When I suspend it using a thread, it aligns itself such that one end faces the geographic north direction. It also attracts items made of similar materials. What can this bar be considered analogically similar to?
Answer» There is a bar in my hand. When I suspend it using a thread, it aligns itself such that one end faces the geographic north direction. It also attracts items made of similar materials. What can this bar be considered analogically similar to?

Discussion

9409.	When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is(give correct reason to support this answer ) and also why other options are not correct except correct one A.uniform B.uniformly accelerated C.zig zag D.circular
Answer» When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is(give correct reason to support this answer ) and also why other options are not correct except correct one A.uniform B.uniformly accelerated C.zig zag D.circular

9409.

When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is(give correct reason to support this answer ) and also why other options are not correct except correct one A.uniform B.uniformly accelerated C.zig zag D.circular

Answer»

When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is(give correct reason to support this answer ) and also why other options are not correct except correct one

A.uniform

B.uniformly accelerated

C.zig zag

D.circular

Discussion

9410.	Universal gravitational constant is equal to force when they are separated by a unit distance and both the masses of body is are 1 kg respectively. Now since universal gravitational constant is equal to the force then, since force is vector quantity than universal gravitational constant must be a vector quantity but universal gravitational constant is a scalar quantity. How does this happen. Please explain
Answer» Universal gravitational constant is equal to force when they are separated by a unit distance and both the masses of body is are 1 kg respectively. Now since universal gravitational constant is equal to the force then, since force is vector quantity than universal gravitational constant must be a vector quantity but universal gravitational constant is a scalar quantity. How does this happen. Please explain

Discussion

9411.	How much work should be done on a bicycle of mass 20 kg to increase its speed from 2 m/s to 5 m/s ? And can we solve this question with work energy theorm?and the right answer is 210 J?i have solved this by work energy theorm but my answer is coming 90 J ? Please help!
Answer» How much work should be done on a bicycle of mass 20 kg to increase its speed from 2 m/s to 5 m/s ? And can we solve this question with work energy theorm?and the right answer is 210 J?i have solved this by work energy theorm but my answer is coming 90 J ? Please help!

Discussion

9412.	In which gas sound travels faster, hydrogen or carbon- dioxide? Give reason
Answer» In which gas sound travels faster, hydrogen or carbon- dioxide? Give reason

Discussion

9413.	Pick the correct option(s) representing the unit of work.
Answer» Pick the correct option(s) representing the unit of work.

Discussion

9414.	A sound source sends waves of 400 Hz. In a medium, this sound has a wavelength of 2.5 m. Find the speed of sound waves in the medium.
Answer» A sound source sends waves of 400 Hz. In a medium, this sound has a wavelength of 2.5 m. Find the speed of sound waves in the medium.

Discussion

9415.	The part of the eye which helps in its accommodation is:
Answer» The part of the eye which helps in its accommodation is:

Discussion

9416.	The ratio of acceleration due to gravity on the earth to the moon is : (Take Mass of the earth =Me, the radius of earth =Re, Mass of the moon =Mm and the radius of moon =Rm)
Answer» The ratio of acceleration due to gravity on the earth to the moon is : (Take Mass of the earth $= M_{e}$ , the radius of earth $= R_{e}$ , Mass of the moon $= M_{m}$ and the radius of moon $= R_{m}$ )

Discussion

9417.	The diagram (Fig.2.6) below shows the pattern of the oil on the road, dripping at a constant rate from a moving car.What informations do you get from it about the motion of car ?
Answer» The diagram (Fig.2.6) below shows the pattern of the oil on the road, dripping at a constant rate from a moving car.What informations do you get from it about the motion of car ?

9417.

The diagram (Fig.2.6) below shows the pattern of the oil on the road, dripping at a constant rate from a moving car.What informations do you get from it about the motion of car ?

Answer»

The diagram (Fig.2.6) below shows the pattern of the oil on the road, dripping at a constant rate from a moving car.What informations do you get from it about the motion of car ?

Discussion

9418.	A stone is thrown vertically upwards with a velocity 9.8 m/s. a) What is the time taken to reach the maximum height? b) What is the maximum height reached? c) What is the velocity with which it reaches the ground?
Answer» A stone is thrown vertically upwards with a velocity 9.8 m/s. a) What is the time taken to reach the maximum height? b) What is the maximum height reached? c) What is the velocity with which it reaches the ground?

Discussion

9419.	An artificial satellite is moving in a circular orbit of radius 4200 km around the earth. What is its speed if it takes one day to complete one revolution?
Answer» An artificial satellite is moving in a circular orbit of radius $4200 k m$ around the earth. What is its speed if it takes one day to complete one revolution?

Discussion

9420.	Biomagnification is highest in
Answer» Biomagnification is highest in

Discussion

9421.	A stone resting on the ground has a gravitational force of 20 N acting on it. What is the weight of the stone? What is its mass? (g=10 m/s2).
Answer» A stone resting on the ground has a gravitational force of 20 N acting on it. What is the weight of the stone? What is its mass? $(g = 10 m / s^{2})$ .

Discussion

9422.	One decibel change in loudness is equal to:
Answer» One decibel change in loudness is equal to:

Discussion

9423.	Newton's first law of motion defines force.
Answer» Newton's first law of motion defines force.

Discussion

9424.	Question 17 The velocity of a body moving in a straight line is increased by applying a constant force F. for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.
Answer» Question 17 The velocity of a body moving in a straight line is increased by applying a constant force F. for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Discussion

9425.	Question 17 Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 kmph?
Answer» Question 17 Calculate the work required to be done to stop a car of $1500 k g$ moving at a velocity of $60 k m p h$ ?

Discussion

9426.	What is the commercial unit of energy. What is the SI unit of Electric energy. A body does 20 joules of work in 5 seconds. What is its power? [5 MARKS]
Answer» What is the commercial unit of energy. What is the SI unit of Electric energy. A body does 20 joules of work in 5 seconds. What is its power? [5 MARKS]

Discussion

9427.	Statement 1: Dams are constructed to produce hydro electricity. Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.
Answer» Statement 1: Dams are constructed to produce hydro electricity. Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.

9427.

Statement 1: Dams are constructed to produce hydro electricity. Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.

Answer»

Statement 1: Dams are constructed to produce hydro electricity.

Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.

Discussion

9428.	How much is the heat energy produced in 10 seconds in an electric iron having resistance 440 Ω, when a potential difference of 220 volt is applied across it?
Answer» How much is the heat energy produced in $10 s e c o n d s$ in an electric iron having resistance $440 Ω$ , when a potential difference of $220 v o l t$ is applied across it?

Discussion

9429.	A body of mass 5 kg has a velocity of 20 metres per second. Its momentum is .
Answer» A body of mass 5 kg has a velocity of 20 metres per second. Its momentum is .

Discussion

9430.	What would be the time period of a simple pendulum at the centre of earth?
Answer» What would be the time period of a simple pendulum at the centre of earth?

Discussion

9431.	With the increase in temperature, the level of water
Answer» With the increase in temperature, the level of water

Discussion

9432.	Which of the following statement concerning magnetic field is correct? (1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole. (2) A magnetic field is never created by a compass needle. (3) Magnetic lines of forces can intersect each other.
Answer» Which of the following statement concerning magnetic field is correct? (1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole. (2) A magnetic field is never created by a compass needle. (3) Magnetic lines of forces can intersect each other.

9432.

Which of the following statement concerning magnetic field is correct? (1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole. (2) A magnetic field is never created by a compass needle. (3) Magnetic lines of forces can intersect each other.

Answer»

Which of the following statement concerning magnetic field is correct?

(1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole.

(2) A magnetic field is never created by a compass needle.

(3) Magnetic lines of forces can intersect each other.

Discussion

9433.	When you attach an object to the hook of a spring balance, you get
Answer» When you attach an object to the hook of a spring balance, you get

Discussion

9434.	Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by
Answer» Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

Discussion

9435.	Question 3 A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Answer» Question 3 A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

Discussion

9436.	A body starts accelerating from rest under gravity. What is the displacement of the body in the time interval of the 10-15 seconds? (Assume g=10 ms−2)
Answer» A body starts accelerating from rest under gravity. What is the displacement of the body in the time interval of the 10-15 seconds? (Assume $g = 10 {m s}^{- 2}$ )

Discussion

9437.	A ball of mass m falls vertically to the ground from a height h1 and rebound to a height h2. The change in momentum of the ball on striking the ground is
Answer» A ball of mass m falls vertically to the ground from a height $h_{1}$ and rebound to a height $h_{2}$ . The change in momentum of the ball on striking the ground is

Discussion

9438.	Name the physical quantity whose SI unit is 'hertz'.
Answer» Name the physical quantity whose SI unit is 'hertz'.

Discussion

9439.	A barometer is carried from a first floor 20th floor of a building why does the reading on the Barometer fall
Answer» A barometer is carried from a first floor 20th floor of a building why does the reading on the Barometer fall

Discussion

9440.	Compare the gravitational forces exerted by the sun and the moon on earth. Which exerts a greater force on earth ? (Given : mass of sun, Ms = 4∗1031 kg; mass of moon, Mm = 6.3∗1022 kg; distance between sun and earth, Rse=1.3∗1012 m and the distance between moon and earth, Rme= 4.5∗108m)
Answer» Compare the gravitational forces exerted by the sun and the moon on earth. Which exerts a greater force on earth ? (Given : mass of sun, Ms = $4 * 10^{31}$ kg; mass of moon, Mm = $6.3 * 10^{22}$ kg; distance between sun and earth, R_se= $1.3 * 10^{12}$ m and the distance between moon and earth, R_me= $4.5 * 10^{8}$ m)

Discussion

9441.	20 L 150 mL = _____ mL
Answer» 20 L 150 mL = _____ mL

Discussion

9442.	How long should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8 A flowing between them?
Answer» How long should a flow of $10^{19}$ electrons be maintained between two points A and B to have a constant current of 8 A flowing between them?

Discussion

9443.	A screw has a pitch equal to 0.5 mm. What should be the number of divisions on its head so as to read correct up to 0.001 mm with its help ?
Answer» A screw has a pitch equal to 0.5 mm. What should be the number of divisions on its head so as to read correct up to 0.001 mm with its help ?

Discussion

9444.	A stop watch has 10 divisions graduated between the 0 and 5 s marks. What is its least count ?
Answer» A stop watch has 10 divisions graduated between the 0 and 5 s marks. What is its least count ?

Discussion

9445.	Define 1 joule. [1 MARK]
Answer» Define 1 joule. [1 MARK]

Discussion

9446.	A rectangular wooden block has mass of 4 kg. The length, breadth and height of this wooden block are 50 cm, 25 cm and 10 cm, respectively. Find the pressure on the table top: (a) When the wooden block is kept with its surface measuring 50 cm×25 cm on the table. (b) When the wooden block is kept with its surface measuring 25 cm×10 cm on the table. (Assume: Acceleration due to gravity, g=10ms−2) [5 MARKS]
Answer» A rectangular wooden block has mass of 4 kg. The length, breadth and height of this wooden block are 50 cm, 25 cm and 10 cm, respectively. Find the pressure on the table top: (a) When the wooden block is kept with its surface measuring $50 c m \times 25 c m$ on the table. (b) When the wooden block is kept with its surface measuring $25 c m \times 10 c m$ on the table. (Assume: Acceleration due to gravity, $g = 10 m s^{- 2}$ ) [5 MARKS]

Discussion

9447.	A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?
Answer» A sound wave has a frequency of $1000 H z$ and a wavelength of $34 c m$ . How long will it take to travel $1 k m$ ?

Discussion

9448.	A 10,000 kg engine exerts a force of 50 kN, to pull 4 wagons along the track as shown. If the track offers an opposing frictional force of 5 kN, calculate the acceleration of the train.
Answer» A 10,000 kg engine exerts a force of 50 kN, to pull 4 wagons along the track as shown. If the track offers an opposing frictional force of 5 kN, calculate the acceleration of the train.

Discussion

9449.	What force is responsible for the earth revolving round the sun?
Answer» What force is responsible for the earth revolving round the sun?

Discussion

9450.	A book of masses 100g is raised to the top of a table of a height 1 m find the magnitude of the work done by the force applied against the gravitational force equal to g =10m/s2
Answer» A book of masses 100g is raised to the top of a table of a height 1 m find the magnitude of the work done by the force applied against the gravitational force equal to g =10m/s²

Discussion

Explore topic-wise InterviewSolutions in .

Amount of pressure of liquid increases with

Two points have a potential difference of 10V. After connecting a conductor with zero resistance between the points, the final potential at each point becomes 25V. What could be their initial potentials?

For the below figure, find the effective potential difference when the batteries are connected in series.

Give one example of a body that has potential energy, in each of the following : (a) due to its position at a height, (b) due to its elongated stretched state.

The given figure shows an arrangement of moving pulleys. If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?

What is faster ,speed of light or speed of expansion of the universe?

There is a bar in my hand. When I suspend it using a thread, it aligns itself such that one end faces the geographic north direction. It also attracts items made of similar materials. What can this bar be considered analogically similar to?

When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is(give correct reason to support this answer ) and also why other options are not correct except correct one A.uniform B.uniformly accelerated C.zig zag D.circular

How much work should be done on a bicycle of mass 20 kg to increase its speed from 2 m/s to 5 m/s ? And can we solve this question with work energy theorm?and the right answer is 210 J?i have solved this by work energy theorm but my answer is coming 90 J ? Please help!

In which gas sound travels faster, hydrogen or carbon- dioxide? Give reason

Pick the correct option(s) representing the unit of work.

A sound source sends waves of 400 Hz. In a medium, this sound has a wavelength of 2.5 m. Find the speed of sound waves in the medium.

The part of the eye which helps in its accommodation is:

The ratio of acceleration due to gravity on the earth to the moon is : (Take Mass of the earth =Me, the radius of earth =Re, Mass of the moon =Mm and the radius of moon =Rm)

The diagram (Fig.2.6) below shows the pattern of the oil on the road, dripping at a constant rate from a moving car.What informations do you get from it about the motion of car ?

A stone is thrown vertically upwards with a velocity 9.8 m/s. a) What is the time taken to reach the maximum height? b) What is the maximum height reached? c) What is the velocity with which it reaches the ground?

An artificial satellite is moving in a circular orbit of radius 4200 km around the earth. What is its speed if it takes one day to complete one revolution?

Biomagnification is highest in

A stone resting on the ground has a gravitational force of 20 N acting on it. What is the weight of the stone? What is its mass? (g=10 m/s2).

One decibel change in loudness is equal to:

Newton's first law of motion defines force.

Question 17 The velocity of a body moving in a straight line is increased by applying a constant force F. for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Question 17 Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 kmph?

What is the commercial unit of energy. What is the SI unit of Electric energy. A body does 20 joules of work in 5 seconds. What is its power? [5 MARKS]

Statement 1: Dams are constructed to produce hydro electricity. Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.

How much is the heat energy produced in 10 seconds in an electric iron having resistance 440 Ω, when a potential difference of 220 volt is applied across it?

A body of mass 5 kg has a velocity of 20 metres per second. Its momentum is .

What would be the time period of a simple pendulum at the centre of earth?

With the increase in temperature, the level of water

Which of the following statement concerning magnetic field is correct? (1) The part of a bar magnet, at which the magnetic field is the strongest, is called its pole. (2) A magnetic field is never created by a compass needle. (3) Magnetic lines of forces can intersect each other.

When you attach an object to the hook of a spring balance, you get

Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

Question 3 A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

A body starts accelerating from rest under gravity. What is the displacement of the body in the time interval of the 10-15 seconds? (Assume g=10 ms−2)

A ball of mass m falls vertically to the ground from a height h1 and rebound to a height h2. The change in momentum of the ball on striking the ground is

Name the physical quantity whose SI unit is 'hertz'.

A barometer is carried from a first floor 20th floor of a building why does the reading on the Barometer fall

Compare the gravitational forces exerted by the sun and the moon on earth. Which exerts a greater force on earth ? (Given : mass of sun, Ms = 4∗1031 kg; mass of moon, Mm = 6.3∗1022 kg; distance between sun and earth, Rse=1.3∗1012 m and the distance between moon and earth, Rme= 4.5∗108m)

20 L 150 mL = _____ mL

How long should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8 A flowing between them?

A screw has a pitch equal to 0.5 mm. What should be the number of divisions on its head so as to read correct up to 0.001 mm with its help ?

A stop watch has 10 divisions graduated between the 0 and 5 s marks. What is its least count ?

Define 1 joule. [1 MARK]

A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

A 10,000 kg engine exerts a force of 50 kN, to pull 4 wagons along the track as shown. If the track offers an opposing frictional force of 5 kN, calculate the acceleration of the train.

What force is responsible for the earth revolving round the sun?

A book of masses 100g is raised to the top of a table of a height 1 m find the magnitude of the work done by the force applied against the gravitational force equal to g =10m/s2