13232 + Interview Questions in Physics Page 79 InterviewSolution

3901.	The work done in moving a unit positive charge is 25 J.What is the potential difference applied across the ends of the conductor?
Answer» The work done in moving a unit positive charge is $25 J$ . What is the potential difference applied across the ends of the conductor?

Discussion

3902.	A particle moves on a circular path of radius 'r', it completes one revolution in 40 seconds. Calculate ratio of distance and displacement in 2 minute 20 second.
Answer» A particle moves on a circular path of radius 'r', it completes one revolution in 40 seconds. Calculate ratio of distance and displacement in 2 minute 20 second.

Discussion

3903.	49.A small ball is dropped from height 3R/2 above the ground and collides with fixed sphere of radius R. . If the ball rebounds horizontally with same speed as before collision then maximum range of projectile along the ground will be
Answer» 49.A small ball is dropped from height 3R/2 above the ground and collides with fixed sphere of radius R. . If the ball rebounds horizontally with same speed as before collision then maximum range of projectile along the ground will be

Discussion

3904.	Question 14A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial Position. Her displacement–time graph is shown in the figure given below. Plot a velocity–time graph for the same.
Answer» Question 14 A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial Position. Her displacement–time graph is shown in the figure given below. Plot a velocity–time graph for the same.

Discussion

3905.	A heavy object and a lighter object are allowed to fall from the certain height in the absence of air then how acceleration and velocity varies?
Answer» A heavy object and a lighter object are allowed to fall from the certain height in the absence of air then how acceleration and velocity varies?

Discussion

3906.	5.Product of the force and the time for which the forceacts is known as(1) Momentum(2) Displacement(3) Impulse of force(4) Inertiafrictioh comes
Answer» 5.Product of the force and the time for which the forceacts is known as(1) Momentum(2) Displacement(3) Impulse of force(4) Inertiafrictioh comes

Discussion

3907.	The masses of two planets are in the ratio 1: 2 and their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio
Answer» The masses of two planets are in the ratio 1: 2 and their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio

Discussion

3908.	A small ball is thrown from the foot of wall with the minimum possible velocity to hit a bulb B on the ground L away from the wall.Find the expression for height h of shadow of ball on the wall as a function of thime't' .acceleration due to gravity is 'g'
Answer» A small ball is thrown from the foot of wall with the minimum possible velocity to hit a bulb B on the ground L away from the wall.Find the expression for height h of shadow of ball on the wall as a function of thime't' .acceleration due to gravity is 'g'

Discussion

3909.	Consider two planets with equal masses having radius r1 and r2 such that r1>r2. The force of gravities at their surfaces are F1 and F2 respectively for a mass m. Which of the following conditions are true?
Answer» Consider two planets with equal masses having radius $r_{1}$ and $r_{2}$ such that $r_{1} > r_{2}$ . The force of gravities at their surfaces are $F_{1}$ and $F_{2}$ respectively for a mass $m$ . Which of the following conditions are true?

Discussion

3910.	Question 17Which of the following statement is always correct?(a) An atom has equal number of electrons and protons(b) An atom has equal number of electrons and neutrons(c) An atom has equal number of protons and neutrons(d) An atom has equal number of electrons, protons and neutrons
Answer» Question 17 Which of the following statement is always correct? (a) An atom has equal number of electrons and protons (b) An atom has equal number of electrons and neutrons (c) An atom has equal number of protons and neutrons (d) An atom has equal number of electrons, protons and neutrons

Discussion

3911.	Question 11What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
Answer» Question 11 What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

Discussion

3912.	Question 3Define the following terms:(a) Compressibility (b) Rigidity (c) Fluidity
Answer» Question 3 Define the following terms: (a) Compressibility (b) Rigidity (c) Fluidity

3912.

Question 3Define the following terms:(a) Compressibility (b) Rigidity (c) Fluidity

Answer»

Question 3

Define the following terms:

(a) Compressibility

(b) Rigidity

(c) Fluidity

Discussion

3913.	An observer at point A notices that an object at point B is stationary. If it is to be assumed that the object at B is under uniform motion, what assumptions can be made about the nature of the observers at A?
Answer» An observer at point A notices that an object at point B is stationary. If it is to be assumed that the object at B is under uniform motion, what assumptions can be made about the nature of the observers at A?

Discussion

3914.	In a car race, car A takes time t less than carB and passes the finishing point with a velocity v more thanthe velocity with which car B passes the point. Assumingthat the cars start from rest and travel with constantaccelerations a1 and a2, show that v = t\surd a1a
Answer» In a car race, car A takes time t less than carB and passes the finishing point with a velocity v more thanthe velocity with which car B passes the point. Assumingthat the cars start from rest and travel with constantaccelerations a1 and a2, show that v = t\surd a1a

Discussion

3915.	When the real object is at distances u1 and u2, the images formed by the same lens are real and virtual respectively, and of the same size. Then the focal length of the lens is
Answer» When the real object is at distances $u_{1}$ and $u_{2}$ , the images formed by the same lens are real and virtual respectively, and of the same size. Then the focal length of the lens is

Discussion

3916.	An ant moves along a circular thread with speed 10cms. It covers one cycle in 10 minutes. Chintu is a naughty boy who cut the thread to make it a straight line and challenges ant to reach the end in half the time. What should be the constant acceleration that ant should maintain to complete his challenge?
Answer» An ant moves along a circular thread with speed $10 \frac{c m}{s}$ . It covers one cycle in 10 minutes. Chintu is a naughty boy who cut the thread to make it a straight line and challenges ant to reach the end in half the time. What should be the constant acceleration that ant should maintain to complete his challenge?

Discussion

3917.	A deutron and an alpha-particle ate placed in an EF. the force acting on them are and their acceleration ate a1 and a2 respectively, then
Answer» A deutron and an alpha-particle ate placed in an EF. the force acting on them are and their acceleration ate a1 and a2 respectively, then

Discussion

3918.	State Newton's second law. Prove that Newton's first law of motion is contained in Newton's second law
Answer» State Newton's second law. Prove that Newton's first law of motion is contained in Newton's second law

Discussion

3919.	The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound=340 m/s )
Answer» The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound=340 m/s )

Discussion

3920.	A particle of mass 200g is moving in a circle of radius 2m the partical is just looping the loop the speed of the partical and tension on the string at highest point of the circular path (the other solutions werent clear so im asking again)
Answer» A particle of mass 200g is moving in a circle of radius 2m the partical is just looping the loop the speed of the partical and tension on the string at highest point of the circular path (the other solutions werent clear so im asking again)

Discussion

3921.	a car covers a semicircular track of radius 5m with a cons†an t speed of 22/7m/s find the magnitude of displacement and average velocity
Answer» a car covers a semicircular track of radius 5m with a cons†an t speed of 22/7m/s find the magnitude of displacement and average velocity

Discussion

3922.	A particle is released from rest from top of tower of height 3h .The ratio of interval of time to cover three equal heights h is??
Answer» A particle is released from rest from top of tower of height 3h .The ratio of interval of time to cover three equal heights h is??

Discussion

3923.	A horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions per min . A small piece of wax of mass m falls vertically on the disc and sticks to it at a distance r from the axis. If the no. Of rpm reduce to 60 then what is the moment of inertia?
Answer» A horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions per min . A small piece of wax of mass m falls vertically on the disc and sticks to it at a distance r from the axis. If the no. Of rpm reduce to 60 then what is the moment of inertia?

Discussion

3924.	The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10∘C and 100∘C. The temperature at which the resistance is 3.26 ohm is
Answer» The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at $10^{\circ} C a n d 100^{\circ} C$ . The temperature at which the resistance is 3.26 ohm is

Discussion

3925.	On what factors does the effect of thrust on a surface depend?
Answer» On what factors does the effect of thrust on a surface depend?

Discussion

3926.	The lens used by a person with hypermetropia is a ___ lens
Answer» The lens used by a person with hypermetropia is a ___ lens

Discussion

3927.	A body floats with 13 of its volume outside water and 34 of its volume outside another liquid. The density of the other liquid is
Answer» A body floats with $\frac{1}{3}$ of its volume outside water and $\frac{3}{4}$ of its volume outside another liquid. The density of the other liquid is

Discussion

3928.	How does a rotatory motion differ from the circular motion? Define axis of rotation?
Answer» How does a rotatory motion differ from the circular motion? Define axis of rotation?

Discussion

3929.	if an object at absolute temperature (T) radiates energy at rate R then select correct graph showing the variation of \log eR with \log e
Answer» if an object at absolute temperature (T) radiates energy at rate R then select correct graph showing the variation of \log eR with \log e

Discussion

3930.	If a lamp having power rating (P,V) is connected across a supply of volt (v') then the resistance of the lamp will be
Answer» If a lamp having power rating (P,V) is connected across a supply of volt (v') then the resistance of the lamp will be

Discussion

3931.	Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Answer» Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.

Discussion

3932.	A pn junction of depletion layer thickness 10 power -6 . its potential across is 0.1V. find its electric fiel
Answer» A pn junction of depletion layer thickness 10 power -6 . its potential across is 0.1V. find its electric fiel

Discussion

3933.	The position of a particle varies with time accordung to the realtion x^2=t+2, find acceleration
Answer» The position of a particle varies with time accordung to the realtion x^2=t+2, find acceleration

Discussion

3934.	The depth d at which the value of acceleration due to gravity becomes 1n times the value at the surface, is:(R=Radius of earth)
Answer» The depth $d$ at which the value of acceleration due to gravity becomes $\frac{1}{n}$ times the value at the surface, is: ( $R = Radius of earth)$

Discussion

3935.	The angular resolution of a radio telescope is to be 0.1∘, when the incident waves have a wavelength of 3.00 mm. The minimum diameter (in m) required for the telescope's receiving disc (in m) is 1.05n. The value of n is (Integer only)
Answer» The angular resolution of a radio telescope is to be ${0.1}^{\circ}$ , when the incident waves have a wavelength of $3.00 mm .$ The minimum diameter $(in m)$ required for the telescope's receiving disc $(in m)$ is $1.05 n$ . The value of $n$ is (Integer only)

Discussion

3936.	Choose the correct SI unit.Length: metre, centimetre or foot;Mass: kilogram or gramTime: hour or second
Answer» Choose the correct SI unit. Length: metre, centimetre or foot; Mass: kilogram or gram Time: hour or second

Discussion

3937.	25. An object is moving along a straight line with a uniform speed of 10m/sec.Plot a graph showing distance versus time from t=0 to t=10sec
Answer» 25. An object is moving along a straight line with a uniform speed of 10m/sec.Plot a graph showing distance versus time from t=0 to t=10sec

Discussion

3938.	Two balls of mass 2 kg and 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet, the ratio of their kinetic energy will be___. Neglect air resistance in both the cases.
Answer» Two balls of mass 2 kg and 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet, the ratio of their kinetic energy will be___. Neglect air resistance in both the cases.

Discussion

3939.	If a point is 5 units to the right of the origin, what is its coordinate?
Answer» If a point is 5 units to the right of the origin, what is its coordinate?

Discussion

3940.	State Newton’s third law of motion.
Answer» State Newton’s third law of motion.

Discussion

3941.	An object of 50 kg gets the speed of 10 m/s in 5 second from zero velocity. Calculate the required force applied by engine of the car? (in N) ___
Answer» An object of 50 kg gets the speed of 10 m/s in 5 second from zero velocity. Calculate the required force applied by engine of the car? (in N) ___

3941.

An object of 50 kg gets the speed of 10 m/s in 5 second from zero velocity. Calculate the required force applied by engine of the car? (in N) ___

Answer»

An object of 50 kg gets the speed of 10 m/s in 5 second from zero velocity. Calculate the required force applied by engine of the car? (in N)

___

Discussion

3942.	A spinning wheel A is brought in contact with another wheel B initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which one of the following energies of wheel B increases?
Answer» A spinning wheel A is brought in contact with another wheel B initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which one of the following energies of wheel B increases?

Discussion

3943.	A bullet of mass 40 g has its kinetic energy equal to 200 J. Then the speed of the bullet is___ ms−1
Answer» A bullet of mass $40 g$ has its kinetic energy equal to $200 J$ . Then the speed of the bullet is___ $m s^{- 1}$

Discussion

3944.	Calculate the amount of work done required in moving 14×1020 electrons across two points of a wire with a potential difference of 28 V.
Answer» Calculate the amount of work done required in moving $14 \times 10^{20}$ electrons across two points of a wire with a potential difference of $28 V$ .

Discussion

3945.	When an object is fully immersed in a liquid, the apparent loss in weight :(1) is less than the weight of liquid displaced by it(2) is more than the weight of liquid displaced by it(3) is equal to the weight of liquid displaced by it(4) does not depend on the density of the liquid displaced by it
Answer» When an object is fully immersed in a liquid, the apparent loss in weight : (1) is less than the weight of liquid displaced by it (2) is more than the weight of liquid displaced by it (3) is equal to the weight of liquid displaced by it (4) does not depend on the density of the liquid displaced by it

Discussion

3946.	An artificial satellite is moving in a circular orbit around the earth with a speed equal to half of the magnitude of escape velocity from the earth. If the satellite is stopped suddenly in its orbit and allowed to fall freely onto the earth, find the speed (km/sec) with which it hits the surface of the earth. (g=9.8 ms−2 and Radius of earth =6400 km)
Answer» An artificial satellite is moving in a circular orbit around the earth with a speed equal to half of the magnitude of escape velocity from the earth. If the satellite is stopped suddenly in its orbit and allowed to fall freely onto the earth, find the speed $(km/sec)$ with which it hits the surface of the earth. $(g = 9.8 {ms}^{- 2}$ and Radius of earth $= 6400 km)$

Discussion

3947.	Why is it difficult to cross fast flowing river using a boat?
Answer» Why is it difficult to cross fast flowing river using a boat?

Discussion

3948.	(a) Define speed. What is the SI unit of speed? (b) What is meant by (i) average speed, and (ii) uniform speed?
Answer» (a) Define speed. What is the SI unit of speed? (b) What is meant by (i) average speed, and (ii) uniform speed?

3948.

(a) Define speed. What is the SI unit of speed? (b) What is meant by (i) average speed, and (ii) uniform speed?

Answer»

(a) Define speed. What is the SI unit of speed?

(b) What is meant by (i) average speed, and (ii) uniform speed?

Discussion

3949.	A person of mass 60 kg is in a lift. The change in the apparent weight of the person, when the lift accelerates up with an acceleration of 2 m/s2 and then down with an acceleration of 2 m/s2 is
Answer» A person of mass $60 kg$ is in a lift. The change in the apparent weight of the person, when the lift accelerates up with an acceleration of $2 {m/s}^{2}$ and then down with an acceleration of $2 {m/s}^{2}$ is

Discussion

3950.	A body of mass 2 kg having a velocity of 2 ms−1 is brought to rest within a distance of 2 m. Find the magnitude of force acting on the body.
Answer» A body of mass $2 k g$ having a velocity of $2 m s^{- 1}$ is brought to rest within a distance of $2 m$ . Find the magnitude of force acting on the body.

Discussion

Explore topic-wise InterviewSolutions in .

The work done in moving a unit positive charge is 25 J.What is the potential difference applied across the ends of the conductor?

A particle moves on a circular path of radius 'r', it completes one revolution in 40 seconds. Calculate ratio of distance and displacement in 2 minute 20 second.

49.A small ball is dropped from height 3R/2 above the ground and collides with fixed sphere of radius R. . If the ball rebounds horizontally with same speed as before collision then maximum range of projectile along the ground will be

Question 14A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial Position. Her displacement–time graph is shown in the figure given below. Plot a velocity–time graph for the same.

A heavy object and a lighter object are allowed to fall from the certain height in the absence of air then how acceleration and velocity varies?

5.Product of the force and the time for which the forceacts is known as(1) Momentum(2) Displacement(3) Impulse of force(4) Inertiafrictioh comes

The masses of two planets are in the ratio 1: 2 and their radii are in the ratio 1: 2. The acceleration due to gravity on the planets is in the ratio

A small ball is thrown from the foot of wall with the minimum possible velocity to hit a bulb B on the ground L away from the wall.Find the expression for height h of shadow of ball on the wall as a function of thime't' .acceleration due to gravity is 'g'

Consider two planets with equal masses having radius r1 and r2 such that r1&gt;r2. The force of gravities at their surfaces are F1 and F2 respectively for a mass m. Which of the following conditions are true?

Question 17Which of the following statement is always correct?(a) An atom has equal number of electrons and protons(b) An atom has equal number of electrons and neutrons(c) An atom has equal number of protons and neutrons(d) An atom has equal number of electrons, protons and neutrons

Question 11What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

Question 3Define the following terms:(a) Compressibility (b) Rigidity (c) Fluidity

An observer at point A notices that an object at point B is stationary. If it is to be assumed that the object at B is under uniform motion, what assumptions can be made about the nature of the observers at A?

In a car race, car A takes time t less than carB and passes the finishing point with a velocity v more thanthe velocity with which car B passes the point. Assumingthat the cars start from rest and travel with constantaccelerations a1 and a2, show that v = t\surd a1a

When the real object is at distances u1 and u2, the images formed by the same lens are real and virtual respectively, and of the same size. Then the focal length of the lens is

A deutron and an alpha-particle ate placed in an EF. the force acting on them are and their acceleration ate a1 and a2 respectively, then

State Newton's second law. Prove that Newton's first law of motion is contained in Newton's second law

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound=340 m/s )

A particle of mass 200g is moving in a circle of radius 2m the partical is just looping the loop the speed of the partical and tension on the string at highest point of the circular path (the other solutions werent clear so im asking again)

a car covers a semicircular track of radius 5m with a cons†an t speed of 22/7m/s find the magnitude of displacement and average velocity

A particle is released from rest from top of tower of height 3h .The ratio of interval of time to cover three equal heights h is??

A horizontal disc rotating freely about a vertical axis through its centre makes 90 revolutions per min . A small piece of wax of mass m falls vertically on the disc and sticks to it at a distance r from the axis. If the no. Of rpm reduce to 60 then what is the moment of inertia?

The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10∘C and 100∘C. The temperature at which the resistance is 3.26 ohm is

On what factors does the effect of thrust on a surface depend?

The lens used by a person with hypermetropia is a ___ lens

A body floats with 13 of its volume outside water and 34 of its volume outside another liquid. The density of the other liquid is

How does a rotatory motion differ from the circular motion? Define axis of rotation?

if an object at absolute temperature (T) radiates energy at rate R then select correct graph showing the variation of \log eR with \log e

If a lamp having power rating (P,V) is connected across a supply of volt (v') then the resistance of the lamp will be

Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.

A pn junction of depletion layer thickness 10 power -6 . its potential across is 0.1V. find its electric fiel

The position of a particle varies with time accordung to the realtion x^2=t+2, find acceleration

The depth d at which the value of acceleration due to gravity becomes 1n times the value at the surface, is:(R=Radius of earth)

The angular resolution of a radio telescope is to be 0.1∘, when the incident waves have a wavelength of 3.00 mm. The minimum diameter (in m) required for the telescope's receiving disc (in m) is 1.05n. The value of n is (Integer only)

Choose the correct SI unit.Length: metre, centimetre or foot;Mass: kilogram or gramTime: hour or second

25. An object is moving along a straight line with a uniform speed of 10m/sec.Plot a graph showing distance versus time from t=0 to t=10sec

Two balls of mass 2 kg and 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet, the ratio of their kinetic energy will be___. Neglect air resistance in both the cases.

If a point is 5 units to the right of the origin, what is its coordinate?

State Newton’s third law of motion.

An object of 50 kg gets the speed of 10 m/s in 5 second from zero velocity. Calculate the required force applied by engine of the car? (in N) ___

A spinning wheel A is brought in contact with another wheel B initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which one of the following energies of wheel B increases?

A bullet of mass 40 g has its kinetic energy equal to 200 J. Then the speed of the bullet is___ ms−1

Calculate the amount of work done required in moving 14×1020 electrons across two points of a wire with a potential difference of 28 V.

When an object is fully immersed in a liquid, the apparent loss in weight :(1) is less than the weight of liquid displaced by it(2) is more than the weight of liquid displaced by it(3) is equal to the weight of liquid displaced by it(4) does not depend on the density of the liquid displaced by it

Why is it difficult to cross fast flowing river using a boat?

(a) Define speed. What is the SI unit of speed? (b) What is meant by (i) average speed, and (ii) uniform speed?

A person of mass 60 kg is in a lift. The change in the apparent weight of the person, when the lift accelerates up with an acceleration of 2 m/s2 and then down with an acceleration of 2 m/s2 is

A body of mass 2 kg having a velocity of 2 ms−1 is brought to rest within a distance of 2 m. Find the magnitude of force acting on the body.

Consider two planets with equal masses having radius r1 and r2 such that r1>r2. The force of gravities at their surfaces are F1 and F2 respectively for a mass m. Which of the following conditions are true?