13232 + Interview Questions in Physics Page 18 InterviewSolution

851.	The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of screw gauge?
Answer» The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of screw gauge?

Discussion

852.	When a tree is shaken,its fruits and leaves fall down.why?
Answer» When a tree is shaken,its fruits and leaves fall down.why?

Discussion

853.	enthalpy of combusstion of propane, bu†an e, and pen†an e are -2220, -2878, -3537 kj/mole respectively . order of calorific value (per gram ) of fuel will b
Answer» enthalpy of combusstion of propane, bu†an e, and pen†an e are -2220, -2878, -3537 kj/mole respectively . order of calorific value (per gram ) of fuel will b

Discussion

854.	The potential difference between the terminals of an electric heater is 30V when it draws a current of 3A from the source. What current will the heater draw if the potential difference is increased to 120V
Answer» The potential difference between the terminals of an electric heater is 30V when it draws a current of 3A from the source. What current will the heater draw if the potential difference is increased to 120V

Discussion

855.	Question 4Certain force acting on 20 kg mass changes its velocity from 5 ms−1 to 2 ms−1. Calculate the work done by the force.
Answer» Question 4 Certain force acting on $20 k g$ mass changes its velocity from $5 m s^{- 1}$ to $2 m s^{- 1}$ . Calculate the work done by the force.

Discussion

856.	write down three differences between mass and moment of inerti
Answer» write down three differences between mass and moment of inerti

Discussion

857.	Explain what is acceleration due to gravity.
Answer» Explain what is acceleration due to gravity.

Discussion

858.	Question 135An electrons mass is approximately 9.1093826×10−31 kilograms. What is its mass in grams?
Answer» Question 135 An electrons mass is approximately $9.1093826 \times 10^{- 31}$ kilograms. What is its mass in grams?

858.

Question 135An electrons mass is approximately 9.1093826×10−31 kilograms. What is its mass in grams?

Answer»

Question 135

An electrons mass is approximately $9.1093826 \times 10^{- 31}$ kilograms. What is its mass in grams?

Discussion

859.	The radius of first Bhor's orbit in H atoms is r_{1.} The corresponding wavelength of an electron in 2nd orbit will be
Answer» The radius of first Bhor's orbit in H atoms is r_{1.} The corresponding wavelength of an electron in 2nd orbit will be

Discussion

860.	The information in which alternative is correctly matched?
Answer» The information in which alternative is correctly matched?

Discussion

861.	Consider the charges q, q and –q placed at the vertices of an equilateral triangle as shown in the figure. The net electrostatic force on the charge +q placed on the centroid will be
Answer» Consider the charges q, q and –q placed at the vertices of an equilateral triangle as shown in the figure. The net electrostatic force on the charge +q placed on the centroid will be

Discussion

862.	If a ball falls from a height, h. After it falls through a distance, the sum of its kinetic and potential energy
Answer» If a ball falls from a height, h. After it falls through a distance, the sum of its kinetic and potential energy

Discussion

863.	137.A man standing on a platform observed that the frequency of the sound of a whistle emitted by a train drops by 140Hz. If the velocity of sound in air is 330m/s and the speed of the train is 70m/s ,the frequency of the whistle is A)571Hz B)800Hz C)400Hz D)260Hz
Answer» 137.A man standing on a platform observed that the frequency of the sound of a whistle emitted by a train drops by 140Hz. If the velocity of sound in air is 330m/s and the speed of the train is 70m/s ,the frequency of the whistle is A)571Hz B)800Hz C)400Hz D)260Hz

Discussion

864.	A vertical closed cylinder is separated into two parts by a frictionless piston of mass m and of negligible thickness. The piston is free to move along the length of the cylinder. The length of the cylinder above the piston is l1, and that below the piston is l2, such that l1>l2. Each part of the cylinder contains n moles of an ideal gas at equal temperature T. If the piston is stationary, its mass, m will be given by:(R is the universal constant and g is the acceleration due to gravity)
Answer» A vertical closed cylinder is separated into two parts by a frictionless piston of mass $m$ and of negligible thickness. The piston is free to move along the length of the cylinder. The length of the cylinder above the piston is $l_{1}$ , and that below the piston is $l_{2}$ , such that $l_{1} > l_{2}$ . Each part of the cylinder contains $n$ moles of an ideal gas at equal temperature $T$ . If the piston is stationary, its mass, $m$ will be given by: ( $R$ is the universal constant and $g$ is the acceleration due to gravity)

Discussion

865.	Does a standard unit remain the same on the moon as it is on the earth?
Answer» Does a standard unit remain the same on the moon as it is on the earth?

Discussion

866.	The frequency of vibration f of a mass m suspended from a spring of spring constant K is given by a relation of this type f=CmxKy; where C is a dimensionless quantity. The value of x and y are:
Answer» The frequency of vibration f of a mass m suspended from a spring of spring constant K is given by a relation of this type $f = C m^{x} K^{y}$ ; where C is a dimensionless quantity. The value of x and y are:

Discussion

867.	In the diagram, the coordinates of Q are (4, 3). What are the coordinates of T?
Answer» In the diagram, the coordinates of Q are (4, 3). What are the coordinates of T?

Discussion

868.	How to know if a Quantity follows the vector laws?
Answer» How to know if a Quantity follows the vector laws?

Discussion

869.	Use the following information to answer the next question. A man is pushing a wall with a force of magnitude 1 000 N The magnitude of the net force on the wall is
Answer» Use the following information to answer the next question. A man is pushing a wall with a force of magnitude 1 000 N The magnitude of the net force on the wall is

869.

Use the following information to answer the next question. A man is pushing a wall with a force of magnitude 1 000 N The magnitude of the net force on the wall is

Answer»

Use the following information to answer the next question.

A man is pushing a wall with a force of magnitude 1 000 N

The magnitude of the net force on the wall is

Discussion

870.	A glass slab is placed in front of the slit S2 as shown in the figure below. Among the points A,B,C,E where should have the source been placed so that the central maxima is formed at O.
Answer» A glass slab is placed in front of the slit $S_{2}$ as shown in the figure below. Among the points $A, B, C, E$ where should have the source been placed so that the central maxima is formed at $O$ .

Discussion

871.	(a) State Newton's third law of motion and give two examples to illustrate the law.(b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.
Answer» (a) State Newton's third law of motion and give two examples to illustrate the law. (b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.

Discussion

872.	Wat is meaning of compression and rarefaction Simple meaning of that pls tell
Answer» Wat is meaning of compression and rarefaction Simple meaning of that pls tell

Discussion

873.	Two cells of emf E1 and E2 are joined in opposition (such that E1>E2). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is
Answer» Two cells of emf $E_{1}$ and $E_{2}$ are joined in opposition (such that $E_{1} > E_{2}$ ). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is

873.

Two cells of emf E1 and E2 are joined in opposition (such that E1>E2). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is

Answer»

Two cells of emf $E_{1}$ and $E_{2}$ are joined in opposition (such that $E_{1} > E_{2}$ ). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is

Discussion

874.	An object will continue to accelerate until, the resultant force on it __
Answer» An object will continue to accelerate until, the resultant force on it __

Discussion

875.	Akshay and Ashwani are arguing in a cafeteria. Akshay says that if he flings the Jell-O with a greater speed it will have a greater inertia. Ashwani argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with?
Answer» Akshay and Ashwani are arguing in a cafeteria. Akshay says that if he flings the Jell-O with a greater speed it will have a greater inertia. Ashwani argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with?

Discussion

876.	A force of 500 N acts on a square piece of plywood, each of whose sides is 5 m long. Calculate the pressure acting on the piece of plywood.
Answer» A force of 500 N acts on a square piece of plywood, each of whose sides is 5 m long. Calculate the pressure acting on the piece of plywood.

Discussion

877.	What are the factors affecting pressure at a point in a liquid?
Answer» What are the factors affecting pressure at a point in a liquid?

Discussion

878.	Write short notes on:(1) Ultrasound(2) SONAR(3) Reverberation
Answer» Write short notes on: (1) Ultrasound (2) SONAR (3) Reverberation

878.

Write short notes on:(1) Ultrasound(2) SONAR(3) Reverberation

Answer»

Write short notes on:

(1) Ultrasound

(2) SONAR

(3) Reverberation

Discussion

879.	How does a mercury thermometer work?
Answer» How does a mercury thermometer work?

Discussion

880.	A motor boat starting from rest on a lake accelerates in a straight line at 3m/s for 8sec. How far does the boat travel during this time
Answer» A motor boat starting from rest on a lake accelerates in a straight line at 3m/s for 8sec. How far does the boat travel during this time

Discussion

881.	How is refractive index of a medium 2 given with respect to medium 1 related to speed of light?where, n1 and n2 are the respective refractive indicies of medium 1 and medium 2. And, c1 and c2 are speed of light in medium 1 and medium 2 respectively.
Answer» How is refractive index of a medium 2 given with respect to medium 1 related to speed of light? where, $n_{1}$ and $n_{2}$ are the respective refractive indicies of medium 1 and medium 2. And, $c_{1}$ and $c_{2}$ are speed of light in medium 1 and medium 2 respectively.

Discussion

882.	{1 The density of the core of a planet is p}}_1{, and that of the outer shell is p}}_2{. The radii of the core and that of the planet are R and 2R respectively. The acceleration due to gravity at the surface of the planet is same as at a depth R The ratio of density p}}_1{/p}}_2 will be
Answer» {1 The density of the core of a planet is p}}_1{, and that of the outer shell is p}}_2{. The radii of the core and that of the planet are R and 2R respectively. The acceleration due to gravity at the surface of the planet is same as at a depth R The ratio of density p}}_1{/p}}_2 will be

Discussion

883.	why does frictional force in pure rolling motion of body in a inclined plane moving down produces no torque?
Answer» why does frictional force in pure rolling motion of body in a inclined plane moving down produces no torque?

Discussion

884.	Write two Properties of action and reaction force
Answer» Write two Properties of action and reaction force

Discussion

885.	man of mass m is suspended in air by holding the rope of a balloon of mass M. As the man climbs upthe rope, the balloon
Answer» man of mass m is suspended in air by holding the rope of a balloon of mass M. As the man climbs up the rope, the balloon

Discussion

886.	A wave is?
Answer» A wave is?

Discussion

887.	The weight of a person on a planet A is about half that on the Earth. He can jump upto 0.4 m height on the surface of the Earth. How high can he jump on the planet A?
Answer» The weight of a person on a planet $A$ is about half that on the Earth. He can jump upto $0.4$ $m$ height on the surface of the Earth. How high can he jump on the planet $A$ ?

Discussion

888.	Question 3What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?
Answer» Question 3 What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?

Discussion

889.	What is the dimension of inertia
Answer» What is the dimension of inertia

Discussion

890.	The displacement-time graph of a moving body is given below.Which of the following graphs would represent the velocity-time graph of the moving body?
Answer» The displacement-time graph of a moving body is given below. Which of the following graphs would represent the velocity-time graph of the moving body?

Discussion

891.	why relative velocity of point of contact of rolling body and the plane in which it moves is0
Answer» why relative velocity of point of contact of rolling body and the plane in which it moves is0

Discussion

892.	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

893.	Question 3 (b)State whether the following statement is true or false.The number of oscillations per second of a vibrating object is called its time period.
Answer» Question 3 (b) State whether the following statement is true or false. The number of oscillations per second of a vibrating object is called its time period.

Discussion

894.	1.why is the choice of k determines the size of unit of charge?2,in quantisation of charges why can n be considered as a negative integer
Answer» 1.why is the choice of k determines the size of unit of charge? 2,in quantisation of charges why can n be considered as a negative integer

Discussion

895.	Why are the ceilings of concert halls curved?
Answer» Why are the ceilings of concert halls curved?

Discussion

896.	Which of the following are not the mobile charge carriers in a conductor?
Answer» Which of the following are not the mobile charge carriers in a conductor?

Discussion

897.	Two bodies are in equilibrium when suspended in water from the arm of a balance. The mass of one body is 60g and its density is 12g/cc.If the mass of the other body is 72g ,then its density in g/cc
Answer» Two bodies are in equilibrium when suspended in water from the arm of a balance. The mass of one body is 60g and its density is 12g/cc.If the mass of the other body is 72g ,then its density in g/cc

Discussion

898.	What is meant by the principle "a liquid seeks its own level"
Answer» What is meant by the principle "a liquid seeks its own level"

Discussion

899.	The mass of the earth is 5.97 x 1024 kg. Its order of magnitude will be
Answer» The mass of the earth is 5.97 x 10²⁴ kg. Its order of magnitude will be

Discussion

900.	A ball (m 1 kg) is dropped from height 20 m. Ifcoefficient of a restitution in 0.9, the impulseimparted to the ground (by the ball) is(1) 38 Ns(2) 40 Ns(3) 57 Ns(4) 81 Ns
Answer» A ball (m 1 kg) is dropped from height 20 m. Ifcoefficient of a restitution in 0.9, the impulseimparted to the ground (by the ball) is(1) 38 Ns(2) 40 Ns(3) 57 Ns(4) 81 Ns

Discussion

Explore topic-wise InterviewSolutions in .

The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of screw gauge?

When a tree is shaken,its fruits and leaves fall down.why?

enthalpy of combusstion of propane, bu†an e, and pen†an e are -2220, -2878, -3537 kj/mole respectively . order of calorific value (per gram ) of fuel will b

The potential difference between the terminals of an electric heater is 30V when it draws a current of 3A from the source. What current will the heater draw if the potential difference is increased to 120V

Question 4Certain force acting on 20 kg mass changes its velocity from 5 ms−1 to 2 ms−1. Calculate the work done by the force.

write down three differences between mass and moment of inerti

Explain what is acceleration due to gravity.

Question 135An electrons mass is approximately 9.1093826×10−31 kilograms. What is its mass in grams?

The radius of first Bhor's orbit in H atoms is r_{1.} The corresponding wavelength of an electron in 2nd orbit will be

The information in which alternative is correctly matched?

Consider the charges q, q and –q placed at the vertices of an equilateral triangle as shown in the figure. The net electrostatic force on the charge +q placed on the centroid will be

If a ball falls from a height, h. After it falls through a distance, the sum of its kinetic and potential energy

137.A man standing on a platform observed that the frequency of the sound of a whistle emitted by a train drops by 140Hz. If the velocity of sound in air is 330m/s and the speed of the train is 70m/s ,the frequency of the whistle is A)571Hz B)800Hz C)400Hz D)260Hz

Does a standard unit remain the same on the moon as it is on the earth?

The frequency of vibration f of a mass m suspended from a spring of spring constant K is given by a relation of this type f=CmxKy; where C is a dimensionless quantity. The value of x and y are:

In the diagram, the coordinates of Q are (4, 3). What are the coordinates of T?

How to know if a Quantity follows the vector laws?

Use the following information to answer the next question. A man is pushing a wall with a force of magnitude 1 000 N The magnitude of the net force on the wall is

A glass slab is placed in front of the slit S2 as shown in the figure below. Among the points A,B,C,E where should have the source been placed so that the central maxima is formed at O.

(a) State Newton's third law of motion and give two examples to illustrate the law.​(b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.

Wat is meaning of compression and rarefaction Simple meaning of that pls tell

Two cells of emf E1 and E2 are joined in opposition (such that E1&gt;E2). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is

An object will continue to accelerate until, the resultant force on it __

Akshay and Ashwani are arguing in a cafeteria. Akshay says that if he flings the Jell-O with a greater speed it will have a greater inertia. Ashwani argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with?

A force of 500 N acts on a square piece of plywood, each of whose sides is 5 m long. Calculate the pressure acting on the piece of plywood.

What are the factors affecting pressure at a point in a liquid?

Write short notes on:(1) Ultrasound(2) SONAR(3) Reverberation

How does a mercury thermometer work?

A motor boat starting from rest on a lake accelerates in a straight line at 3m/s for 8sec. How far does the boat travel during this time

How is refractive index of a medium 2 given with respect to medium 1 related to speed of light?where, n1 and n2 are the respective refractive indicies of medium 1 and medium 2. And, c1 and c2 are speed of light in medium 1 and medium 2 respectively.

{1 The density of the core of a planet is p}}_1{, and that of the outer shell is p}}_2{. The radii of the core and that of the planet are R and 2R respectively. The acceleration due to gravity at the surface of the planet is same as at a depth R The ratio of density p}}_1{/p}}_2 will be

why does frictional force in pure rolling motion of body in a inclined plane moving down produces no torque?

Write two Properties of action and reaction force

man of mass m is suspended in air by holding the rope of a balloon of mass M. As the man climbs upthe rope, the balloon

A wave is?

The weight of a person on a planet A is about half that on the Earth. He can jump upto 0.4 m height on the surface of the Earth. How high can he jump on the planet A?

Question 3What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?

What is the dimension of inertia

The displacement-time graph of a moving body is given below.Which of the following graphs would represent the velocity-time graph of the moving body?

why relative velocity of point of contact of rolling body and the plane in which it moves is0

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.

Question 3 (b)State whether the following statement is true or false.The number of oscillations per second of a vibrating object is called its time period.

1.why is the choice of k determines the size of unit of charge?2,in quantisation of charges why can n be considered as a negative integer

Why are the ceilings of concert halls curved?

Which of the following are not the mobile charge carriers in a conductor?

Two bodies are in equilibrium when suspended in water from the arm of a balance. The mass of one body is 60g and its density is 12g/cc.If the mass of the other body is 72g ,then its density in g/cc

What is meant by the principle "a liquid seeks its own level"

The mass of the earth is 5.97 x 1024 kg. Its order of magnitude will be

A ball (m 1 kg) is dropped from height 20 m. Ifcoefficient of a restitution in 0.9, the impulseimparted to the ground (by the ball) is(1) 38 Ns(2) 40 Ns(3) 57 Ns(4) 81 Ns

(a) State Newton's third law of motion and give two examples to illustrate the law.(b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.

Two cells of emf E1 and E2 are joined in opposition (such that E1>E2). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is