13232 + Interview Questions in Physics Page 19 InterviewSolution

901.	Explain the difference:Point sources and Extended sources.
Answer» Explain the difference: Point sources and Extended sources.

Discussion

902.	If 10 to the power 14 electrons are removed from a neutral metal sphere, then what is the charge on thesphere?
Answer» If 10 to the power 14 electrons are removed from a neutral metal sphere, then what is the charge on thesphere?

Discussion

903.	At what altitude (h) above the earths surface would the acceleration due to gravity be one fourth of its value at the earths surface
Answer» At what altitude (h) above the earths surface would the acceleration due to gravity be one fourth of its value at the earths surface

Discussion

904.	Which of the following statement is correct regarding distance and displacement?
Answer» Which of the following statement is correct regarding distance and displacement?

Discussion

905.	A man wearing a bullet-proof vest stands still on roller stakes. The total mass is 80 kg. A bullet of mass 20 grams is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
Answer» A man wearing a bullet-proof vest stands still on roller stakes. The total mass is 80 kg. A bullet of mass 20 grams is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?

Discussion

906.	The portion of a body moving along x-axis at time T is given by X equal to 30 square minus 40 + 6 distance travelled by a body in time interval t = 0 2 equal to 3
Answer» The portion of a body moving along x-axis at time T is given by X equal to 30 square minus 40 + 6 distance travelled by a body in time interval t = 0 2 equal to 3

Discussion

907.	What is the meaning of delta symbol? In the 2nd law of motion specially.
Answer» What is the meaning of delta symbol? In the 2nd law of motion specially.

Discussion

908.	Which term is used to denote a speed greater than the speed of sound ?
Answer» Which term is used to denote a speed greater than the speed of sound ?

Discussion

909.	ntIf amplitude is increased to its 10% then what will be the increase in intensity of the soundn
Answer» ntIf amplitude is increased to its 10% then what will be the increase in intensity of the soundn

Discussion

910.	2. Use mirror equation to show that an object placed between F (focal point) and C( centre of curvature) of a concave mirror forms an image beyond C.
Answer» 2. Use mirror equation to show that an object placed between F (focal point) and C( centre of curvature) of a concave mirror forms an image beyond C.

Discussion

911.	😕🤔❓Earth is Spherical so why we are not falling❓😕🤔(please answer in brief)
Answer» 😕🤔❓Earth is Spherical so why we are not falling❓😕🤔(please answer in brief)

Discussion

912.	A block is pushed on the ground with an initial velocity of 20 ms, it stops after 6 seconds. What is the average retardation of the block?
Answer» A block is pushed on the ground with an initial velocity of 20 $\frac{m}{s}$ , it stops after 6 seconds. What is the average retardation of the block?

Discussion

913.	what is mechanical equivalent of heat?
Answer» what is mechanical equivalent of heat?

Discussion

914.	The path of motion of a roller - coaster is shown in the figure. At the start of the roller - coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself. Identify the energy conversions from Y to Z.
Answer» The path of motion of a roller - coaster is shown in the figure. At the start of the roller - coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself. Identify the energy conversions from Y to Z.

914.

The path of motion of a roller - coaster is shown in the figure. At the start of the roller - coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself. Identify the energy conversions from Y to Z.

Answer»

The path of motion of a roller - coaster is shown in the figure. At the start of the roller - coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself.

Identify the energy conversions from Y to Z.

Discussion

915.	Explain luminous and illuminated objects with examples. [3 MARKS]
Answer» Explain luminous and illuminated objects with examples. [3 MARKS]

Discussion

916.	(a) What does the slope of a displacement-time graph represent? (b) Can displacement-time sketch be parallel to the displacement axis? Give reason to support your answer.
Answer» (a) What does the slope of a displacement-time graph represent? (b) Can displacement-time sketch be parallel to the displacement axis? Give reason to support your answer.

916.

(a) What does the slope of a displacement-time graph represent? (b) Can displacement-time sketch be parallel to the displacement axis? Give reason to support your answer.

Answer»

(a) What does the slope of a displacement-time graph represent?

(b) Can displacement-time sketch be parallel to the displacement axis? Give reason to support your answer.

Discussion

917.	If a force acting on a block of mass 2 kg is given by F = (2t) N then its velocity at t = 2s will be (Assuming block was initially at rest)
Answer» If a force acting on a block of mass 2 kg is given by F = (2t) N then its velocity at t = 2s will be (Assuming block was initially at rest)

Discussion

918.	23.A meter stick is held vertically with one end on the floor and is allowed to fall the speed of the other end when it hits the floor?
Answer» 23.A meter stick is held vertically with one end on the floor and is allowed to fall the speed of the other end when it hits the floor?

Discussion

919.	Question 10Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?a) Dispersion of lightb) Scattering of lightc) Total internal reflection of lightd) Reflection of light from the earth
Answer» Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? a) Dispersion of light b) Scattering of light c) Total internal reflection of light d) Reflection of light from the earth

919.

Question 10Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?a) Dispersion of lightb) Scattering of lightc) Total internal reflection of lightd) Reflection of light from the earth

Answer»

Question 10

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a) Dispersion of light

b) Scattering of light

c) Total internal reflection of light

d) Reflection of light from the earth

Discussion

920.	Two persons manage to push a car of mass 1000kg at a uniform velocity along a straight levelled road. The same car can be pushed by three persons to produce an acceleration of 0.1m/s^2. With what force does each person push the car?
Answer» Two persons manage to push a car of mass 1000kg at a uniform velocity along a straight levelled road. The same car can be pushed by three persons to produce an acceleration of 0.1m/s^2. With what force does each person push the car?

Discussion

921.	if a ball of mass10 gm strikes perpendicular on a hard floor with speed 5 m/sec and rebounces with the same speed and remains in contact with floor for 1 sec ,then the force applied on the ball by the floor is how much
Answer» if a ball of mass10 gm strikes perpendicular on a hard floor with speed 5 m/sec and rebounces with the same speed and remains in contact with floor for 1 sec ,then the force applied on the ball by the floor is how much

Discussion

922.	State newton's second law of motion. What information do you get form it?
Answer» State newton's second law of motion. What information do you get form it?

Discussion

923.	I need some videos regarding the topics of trajectory with formulae
Answer» I need some videos regarding the topics of trajectory with formulae

Discussion

924.	A very small linear object of size 1 mm is kept at a distance of 40 cm from a concave mirror of focal length 30 cm. The length of the image when the object is placed along the principal axis will be
Answer» A very small linear object of size $1 mm$ is kept at a distance of $40 cm$ from a concave mirror of focal length $30 cm$ . The length of the image when the object is placed along the principal axis will be

Discussion

925.	A box of mass 20 kg is moving with a velocity of 2 ms−1 on a rough floor. The box moves 5 m on the floor before coming to rest. What must be the frictional force acting on the box?
Answer» A box of mass $20 k g$ is moving with a velocity of $2 m s^{- 1}$ on a rough floor. The box moves $5 m$ on the floor before coming to rest. What must be the frictional force acting on the box?

Discussion

926.	Why are copper and aluminium wires usually employed for electricity transmission? [1 MARK]
Answer» Why are copper and aluminium wires usually employed for electricity transmission? [1 MARK]

Discussion

927.	29. A person, with outstretched arms, is spinning ona rotating stool. He suddenly brings his armsdown to his sides. Which of the following is trueabout his kinetic energy K and angularmomentum L?(1) Both K and L increase(2) Both K and L remain unchanged(3) K remains constant, L increases(4) K increases but L remains constant
Answer» 29. A person, with outstretched arms, is spinning on a rotating stool. He suddenly brings his arms down to his sides. Which of the following is true about his kinetic energy K and angular momentum L? (1) Both K and L increase (2) Both K and L remain unchanged (3) K remains constant, L increases (4) K increases but L remains constant

Discussion

928.	Can electric field at a point be zero, if electric potential is non zero? Justify.
Answer» Can electric field at a point be zero, if electric potential is non zero? Justify.

Discussion

929.	The sound wave is a sequence of __ and rarefactions.
Answer» The sound wave is a sequence of __ and rarefactions.

Discussion

930.	An observer looks at a distance tree of height 10 metre with a telescope of magnifying power of 20.To the observer that tree appearsA- 10 times tallerB- 10 times nearerC- 20 times tallerD- 20 ti.es nearer
Answer» An observer looks at a distance tree of height 10 metre with a telescope of magnifying power of 20. To the observer that tree appears A- 10 times taller B- 10 times nearer C- 20 times taller D- 20 ti.es nearer

Discussion

931.	energy required to place a body of mass m from an orbit of radius 2R to 3R is1. GMm/R2. GMm/12R3. GMm/18R4. GMm/6R
Answer» energy required to place a body of mass m from an orbit of radius 2R to 3R is 1. GMm/R 2. GMm/12R 3. GMm/18R 4. GMm/6R

Discussion

932.	48.Find the force acting on a body of mass 10 kg such that it changes its velocity from 20m/s to 40m/s while covering a distance of 10m?
Answer» 48.Find the force acting on a body of mass 10 kg such that it changes its velocity from 20m/s to 40m/s while covering a distance of 10m?

Discussion

933.	Question 1Two objects of different masses falling freely near the surface of moon would(a) have same velocities at any instant(b) have different accelerations(c) experience forces of same magnitude(d) undergo a change in their inertia
Answer» Question 1 Two objects of different masses falling freely near the surface of moon would (a) have same velocities at any instant (b) have different accelerations (c) experience forces of same magnitude (d) undergo a change in their inertia

Discussion

934.	What are the major causes of acid rain?
Answer» What are the major causes of acid rain?

Discussion

935.	An object is held at 30 cm in front of a convex mirror of a focal length 15 cm. At what distance from the convex mirror should a plane mirror be held so that images in the two mirrors coincide with each other?
Answer» An object is held at 30 cm in front of a convex mirror of a focal length 15 cm. At what distance from the convex mirror should a plane mirror be held so that images in the two mirrors coincide with each other?

Discussion

936.	What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.
Answer» What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.

Discussion

937.	Why do we hear more clearly in a room with curtains than in a room without curtains ?
Answer» Why do we hear more clearly in a room with curtains than in a room without curtains ?

Discussion

938.	A TV set shoots out a beam of electrons. The beam current is 10 μA. How many electrons strike the TV screen in each second? How much charge strikes the screen in a minute?
Answer» A TV set shoots out a beam of electrons. The beam current is $10 μ$ A. How many electrons strike the TV screen in each second? How much charge strikes the screen in a minute?

Discussion

939.	In a concave mirror, the image is inverted and same size as the object when the object is placed at
Answer» In a concave mirror, the image is inverted and same size as the object when the object is placed at

Discussion

940.	A sound wave having a wavelength of 2 cm is travelling in water. If the velocity of sound in water is 1600 ms−1. What is the frequency of the sound wave?
Answer» A sound wave having a wavelength of $2 c m$ is travelling in water. If the velocity of sound in water is $1600 m s^{- 1}$ . What is the frequency of the sound wave?

Discussion

941.	A person had some rupees which is a power of 5. He gave a part of it to his friend which is also a power of 5. He was left with Rs 500. How much did money he have?
Answer» A person had some rupees which is a power of 5. He gave a part of it to his friend which is also a power of 5. He was left with Rs 500. How much did money he have?

Discussion

942.	What is thrust and how it is related to pressure
Answer» What is thrust and how it is related to pressure

Discussion

943.	A block weighing 150 g when immersed in water taken in a Eureka can displace 10 mL of water. Find the density of the block.
Answer» A block weighing 150 g when immersed in water taken in a Eureka can displace 10 mL of water. Find the density of the block.

Discussion

944.	Calculate time when a liquid filled at a certain height(a) and there is a hole a some another smaller height(h) of area A2 . And we have to calculate the time till the water level reach at height (b). Area of container is A1. Density is rho
Answer» Calculate time when a liquid filled at a certain height(a) and there is a hole a some another smaller height(h) of area A2 . And we have to calculate the time till the water level reach at height (b). Area of container is A1. Density is rho

Discussion

945.	The magnetic induction at a point P which is distant by 4 cm from a long current carrying wire is 10^{-3} tesla the field of induction at a distance 12 cm from the same current would be
Answer» The magnetic induction at a point P which is distant by 4 cm from a long current carrying wire is 10^{-3} tesla the field of induction at a distance 12 cm from the same current would be

Discussion

946.	what is mole conspect explain
Answer» what is mole conspect explain

Discussion

947.	The maximum speed of vibrations which produce audible sound will be in : (a) dry air (6) sea water (c) ground glass (d) human blood
Answer» The maximum speed of vibrations which produce audible sound will be in : (a) dry air (6) sea water (c) ground glass (d) human blood

947.

The maximum speed of vibrations which produce audible sound will be in : (a) dry air (6) sea water (c) ground glass (d) human blood

Answer»

The maximum speed of vibrations which produce audible sound will be in :

(a) dry air (6) sea water (c) ground glass (d) human blood

Discussion

948.	5.How to determine the angle between velocity vector and acceleration vector in uniform circular motion?
Answer» 5.How to determine the angle between velocity vector and acceleration vector in uniform circular motion?

Discussion

949.	What relation between force and momentum can be used to solve this problem? "An object of mass 100 Kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 seconds. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object."
Answer» What relation between force and momentum can be used to solve this problem? "An object of mass 100 Kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 seconds. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object."

Discussion

950.	force = mass x acceleration then,if i holding a 10 kg rice pack on my top and it staying there itself. is it mean that i am applying 0 N on the rice pack (a =o ) even though i am applying force against gravity ?
Answer» force = mass x acceleration then,if i holding a 10 kg rice pack on my top and it staying there itself. is it mean that i am applying 0 N on the rice pack (a =o ) even though i am applying force against gravity ?

950.

force = mass x acceleration then,if i holding a 10 kg rice pack on my top and it staying there itself. is it mean that i am applying 0 N on the rice pack (a =o ) even though i am applying force against gravity ?

Answer»

force = mass x acceleration

then,if i holding a 10 kg rice pack on my top and it staying there itself.

is it mean that i am applying 0 N on the rice pack (a =o )

even though i am applying force against gravity ?

Discussion

Explore topic-wise InterviewSolutions in .

Explain the difference:Point sources and Extended sources.

If 10 to the power 14 electrons are removed from a neutral metal sphere, then what is the charge on thesphere?

At what altitude (h) above the earths surface would the acceleration due to gravity be one fourth of its value at the earths surface

Which of the following statement is correct regarding distance and displacement?

A man wearing a bullet-proof vest stands still on roller stakes. The total mass is 80 kg. A bullet of mass 20 grams is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?

The portion of a body moving along x-axis at time T is given by X equal to 30 square minus 40 + 6 distance travelled by a body in time interval t = 0 2 equal to 3

What is the meaning of delta symbol? In the 2nd law of motion specially.

Which term is used to denote a speed greater than the speed of sound ?

ntIf amplitude is increased to its 10% then what will be the increase in intensity of the soundn

2. Use mirror equation to show that an object placed between F (focal point) and C( centre of curvature) of a concave mirror forms an image beyond C.

😕🤔❓Earth is Spherical so why we are not falling❓😕🤔(please answer in brief)

A block is pushed on the ground with an initial velocity of 20 ms, it stops after 6 seconds. What is the average retardation of the block?

what is mechanical equivalent of heat?

The path of motion of a roller - coaster is shown in the figure. At the start of the roller - coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself. Identify the energy conversions from Y to Z.

Explain luminous and illuminated objects with examples. [3 MARKS]

(a) What does the slope of a displacement-time graph represent? (b) Can displacement-time sketch be parallel to the displacement axis? Give reason to support your answer.

If a force acting on a block of mass 2 kg is given by F = (2t) N then its velocity at t = 2s will be (Assuming block was initially at rest)

23.A meter stick is held vertically with one end on the floor and is allowed to fall the speed of the other end when it hits the floor?

Question 10Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?a) Dispersion of lightb) Scattering of lightc) Total internal reflection of lightd) Reflection of light from the earth

Two persons manage to push a car of mass 1000kg at a uniform velocity along a straight levelled road. The same car can be pushed by three persons to produce an acceleration of 0.1m/s^2. With what force does each person push the car?

if a ball of mass10 gm strikes perpendicular on a hard floor with speed 5 m/sec and rebounces with the same speed and remains in contact with floor for 1 sec ,then the force applied on the ball by the floor is how much

State newton's second law of motion. What information do you get form it?

I need some videos regarding the topics of trajectory with formulae

A very small linear object of size 1 mm is kept at a distance of 40 cm from a concave mirror of focal length 30 cm. The length of the image when the object is placed along the principal axis will be

A box of mass 20 kg is moving with a velocity of 2 ms−1 on a rough floor. The box moves 5 m on the floor before coming to rest. What must be the frictional force acting on the box?

Why are copper and aluminium wires usually employed for electricity transmission? [1 MARK]

Can electric field at a point be zero, if electric potential is non zero? Justify.

The sound wave is a sequence of __ and rarefactions.

An observer looks at a distance tree of height 10 metre with a telescope of magnifying power of 20.To the observer that tree appearsA- 10 times tallerB- 10 times nearerC- 20 times tallerD- 20 ti.es nearer

energy required to place a body of mass m from an orbit of radius 2R to 3R is1. GMm/R2. GMm/12R3. GMm/18R4. GMm/6R

48.Find the force acting on a body of mass 10 kg such that it changes its velocity from 20m/s to 40m/s while covering a distance of 10m?

Question 1Two objects of different masses falling freely near the surface of moon would(a) have same velocities at any instant(b) have different accelerations(c) experience forces of same magnitude(d) undergo a change in their inertia

What are the major causes of acid rain?

An object is held at 30 cm in front of a convex mirror of a focal length 15 cm. At what distance from the convex mirror should a plane mirror be held so that images in the two mirrors coincide with each other?

What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.

Why do we hear more clearly in a room with curtains than in a room without curtains ?

A TV set shoots out a beam of electrons. The beam current is 10 μA. How many electrons strike the TV screen in each second? How much charge strikes the screen in a minute?

In a concave mirror, the image is inverted and same size as the object when the object is placed at

A sound wave having a wavelength of 2 cm is travelling in water. If the velocity of sound in water is 1600 ms−1. What is the frequency of the sound wave?

A person had some rupees which is a power of 5. He gave a part of it to his friend which is also a power of 5. He was left with Rs 500. How much did money he have?

What is thrust and how it is related to pressure

A block weighing 150 g when immersed in water taken in a Eureka can displace 10 mL of water. Find the density of the block.

Calculate time when a liquid filled at a certain height(a) and there is a hole a some another smaller height(h) of area A2 . And we have to calculate the time till the water level reach at height (b). Area of container is A1. Density is rho

The magnetic induction at a point P which is distant by 4 cm from a long current carrying wire is 10^{-3} tesla the field of induction at a distance 12 cm from the same current would be

what is mole conspect explain

The maximum speed of vibrations which produce audible sound will be in : (a) dry air (6) sea water (c) ground glass (d) human blood

5.How to determine the angle between velocity vector and acceleration vector in uniform circular motion?

What relation between force and momentum can be used to solve this problem? "An object of mass 100 Kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 seconds. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object."

force = mass x acceleration then,if i holding a 10 kg rice pack on my top and it staying there itself. is it mean that i am applying 0 N on the rice pack (a =o ) even though i am applying force against gravity ?