13232 + Interview Questions in Physics Page 86 InterviewSolution

4251.	A body of mass m is projected from ground with speed u at an angle theta with horizontal. The power delivered by gravity to it at half of maximum height from ground is
Answer» A body of mass m is projected from ground with speed u at an angle theta with horizontal. The power delivered by gravity to it at half of maximum height from ground is

Discussion

4252.	A barometer kept in an elevator reads 76cm when the elevator is accelerating upwards.The most likely pressure inside the elevator (in cm of Hg)
Answer» A barometer kept in an elevator reads 76cm when the elevator is accelerating upwards.The most likely pressure inside the elevator (in cm of Hg)

Discussion

4253.	Question 4Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
Answer» Question 4 Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Discussion

4254.	A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will ___ .
Answer» A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will ___ .

Discussion

4255.	Use the following information to answer the next question. Thedifference between the momentums of which two bodies will be the maximum?
Answer» Use the following information to answer the next question. Thedifference between the momentums of which two bodies will be the maximum?

4255.

Use the following information to answer the next question. Thedifference between the momentums of which two bodies will be the maximum?

Answer»

Use the following information to answer the next question.

Thedifference between the momentums of which two bodies will be the maximum?

Discussion

4256.	The speed of the body in the time interval 14 to 18 seconds is
Answer» The speed of the body in the time interval 14 to 18 seconds is

4256.

The speed of the body in the time interval 14 to 18 seconds is

Answer»

The speed of the body in the time interval 14 to 18 seconds is

Discussion

4257.	The distance between two consecutive crests or trough of a wave is called its ___.
Answer» The distance between two consecutive crests or trough of a wave is called its ___.

Discussion

4258.	How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction
Answer» How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction

Discussion

4259.	A particle which is experiencing a force, given by →F=3^i−12^j, undergoes a displacement of →d=4^i. If the particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement ?
Answer» A particle which is experiencing a force, given by $\to F = 3^i - 12^j$ , undergoes a displacement of $\to d = 4^i$ . If the particle had a kinetic energy of $3 J$ at the beginning of the displacement, what is its kinetic energy at the end of the displacement ?

Discussion

4260.	Calculate the force between two objects having masses of 50 kg and 100 kg respectively and separated by a distance of 10 m.
Answer» Calculate the force between two objects having masses of 50 kg and 100 kg respectively and separated by a distance of 10 m.

4260.

Calculate the force between two objects having masses of 50 kg and 100 kg respectively and separated by a distance of 10 m.

Answer»

Calculate the force between two objects having masses of 50 kg and 100 kg respectively and separated by a distance of 10 m.

Discussion

4261.	A bat in search of prey hears the echo of its squeak after 0.1 s. How far is the prey from the bat, if the squeak got reflected from it?(speed of sound in air =340 m/s)
Answer» A bat in search of prey hears the echo of its squeak after $0.1 s$ . How far is the prey from the bat, if the squeak got reflected from it? $($ speed of sound in air $= 340 m/s)$

Discussion

4262.	Question 1(iv)The following graph shows the temperature of a patient in a hospital, recorded every hourWhat was the temperature at 1.30p.m.? How did you arrive at your answer?
Answer» Question 1(iv) The following graph shows the temperature of a patient in a hospital, recorded every hour What was the temperature at 1.30p.m.? How did you arrive at your answer?

Discussion

4263.	6. When an oscillator completes 100 oscillations its amplitude reduced to 1/3 of initial value. What will be the amplitude when it completes 200 oscillation? 1) 1/8 2) 2/3 3) 1/6 4) 1/9
Answer» 6. When an oscillator completes 100 oscillations its amplitude reduced to 1/3 of initial value. What will be the amplitude when it completes 200 oscillation? 1) 1/8 2) 2/3 3) 1/6 4) 1/9

Discussion

4264.	What happens to the image, if a convex lens is made up of two different transparent materials as shown in figure?
Answer» What happens to the image, if a convex lens is made up of two different transparent materials as shown in figure?

Discussion

4265.	The position of a body moving along x-axis at timet is given by x =travelled by body in time interval t = 0 to(t24t+6) m. The distance= 3 s is(1) 5 m(3) 4 m(2) 7 m(4) 3 m
Answer» The position of a body moving along x-axis at time t is given by x = travelled by body in time interval t = 0 to (t24t+6) m. The distance = 3 s is (1) 5 m (3) 4 m (2) 7 m (4) 3 m

Discussion

4266.	A 60 g bullet fired from a 5 kg gun leaves with a speed of 500 m/s. Find the speed (velocity) with which the gun recoils (jerks backwards).
Answer» A 60 g bullet fired from a 5 kg gun leaves with a speed of 500 m/s. Find the speed (velocity) with which the gun recoils (jerks backwards).

Discussion

4267.	A boy playing on the roof of a building(10m high), throws a ball with a speed of 10 m/s at an angle of 30^° to the horizontal. How far from the starting point will be the ball at a height of 10 m from the ground?
Answer» A boy playing on the roof of a building(10m high), throws a ball with a speed of 10 m/s at an angle of 30^° to the horizontal. How far from the starting point will be the ball at a height of 10 m from the ground?

Discussion

4268.	Motion of a satellite in circular orbit is an example of ___.
Answer» Motion of a satellite in circular orbit is an example of ___.

Discussion

4269.	The density of water is 1 g/cc. The numerical value of density of water in new unit kg/m^3 is Options: a) 1 b) 10 c) 10^2 d) 10^3
Answer» The density of water is 1 g/cc. The numerical value of density of water in new unit kg/m^3 is Options: a) 1 b) 10 c) 10^2 d) 10^3

Discussion

4270.	If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .
Answer» If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

Discussion

4271.	28.A small plane mirror is rotating at a constant frequency of n rotation per second. with what linear velocity will a light spot move along a spherical screen of radius of curvature R metres if the mirror at the centre of curvature of the screen?
Answer» 28.A small plane mirror is rotating at a constant frequency of n rotation per second. with what linear velocity will a light spot move along a spherical screen of radius of curvature R metres if the mirror at the centre of curvature of the screen?

Discussion

4272.	What are renewable sources of energy?
Answer» What are renewable sources of energy?

Discussion

4273.	Case 1: A bottle is fully filled with water and a hole is made at the bottom. Case 2: A bottle is fully filled with water and a hole is made in the middle of it. In which case, the water comes out with greater pressure?
Answer» Case 1: A bottle is fully filled with water and a hole is made at the bottom. Case 2: A bottle is fully filled with water and a hole is made in the middle of it. In which case, the water comes out with greater pressure?

Discussion

4274.	In the circuit diagram. Find(i) total resistance(ii) current shown by the ammeter A. [3 MARKS]
Answer» In the circuit diagram. Find (i) total resistance (ii) current shown by the ammeter A. [3 MARKS]

4274.

In the circuit diagram. Find(i) total resistance(ii) current shown by the ammeter A. [3 MARKS]

Answer»

In the circuit diagram.

Find

(i) total resistance

(ii) current shown by the ammeter A. [3 MARKS]

Discussion

4275.	The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be
Answer» The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be

4275.

The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be

Answer»

The intensity of sound wave while passing through an elastic medium falls

down by 10% as it covers one metre distance through the medium. If the

initial intensity of the sound wave was 100 decibels, its value after it has

passed through 3 metre thickness of the medium will be

Discussion

4276.	Select non-conductors of electricity from the following
Answer» Select non-conductors of electricity from the following

Discussion

4277.	ntA wire has a mass (0.3+-0.003)g, radius(0.5+-0.005)mm and length (6+-0.06)cm. The maximum percentage error in measurement of density isn nt(1)1 (2)2n nt(3)3 (4)4n
Answer» ntA wire has a mass (0.3+-0.003)g, radius(0.5+-0.005)mm and length (6+-0.06)cm. The maximum percentage error in measurement of density isn nt(1)1 (2)2n nt(3)3 (4)4n

Discussion

4278.	Given that a body falling freely passes through5390 cm in the sixth second. Find the value of g(1) 1000 cm/s2(2) 900 cm/s2(3) 950 cm/s2(4) 980 cm/s2
Answer» Given that a body falling freely passes through5390 cm in the sixth second. Find the value of g(1) 1000 cm/s2(2) 900 cm/s2(3) 950 cm/s2(4) 980 cm/s2

Discussion

4279.	What is the speed of a car if it goes 200 miles in 4 hours?
Answer» What is the speed of a car if it goes 200 miles in 4 hours?

Discussion

4280.	In a hydraulic lift, there is a piston at one end and a car of mass 400 kg balanced on the load side. If the cross sectional area of load side is 20 m2 and that of the piston is 5 m2, what is the force applied by the piston? [Take g=10 ms−2]
Answer» In a hydraulic lift, there is a piston at one end and a car of mass 400 kg balanced on the load side. If the cross sectional area of load side is 20 $m^{2}$ and that of the piston is 5 $m^{2}$ , what is the force applied by the piston? [Take $g = 10 m s^{- 2}$ ]

Discussion

4281.	The distance of an object from the pole of a concave mirror is equal to its radius of curvature. The image must be which one- a) real b) inverted c) same sized d) erect?
Answer» The distance of an object from the pole of a concave mirror is equal to its radius of curvature. The image must be which one- a) real b) inverted c) same sized d) erect?

Discussion

4282.	If the atmosphere of the Earth is replaced with water, to what extent the water level must rise so as to maintain the same pressure [105 N m−2] on Earth's surface? [Assume nothing above the water surface. take g=10 m s−2, density of water =1000 kg m−3.
Answer» If the atmosphere of the Earth is replaced with water, to what extent the water level must rise so as to maintain the same pressure $[10^{5} N m^{- 2}]$ on Earth's surface? [Assume nothing above the water surface. take $g = 10 m s^{- 2}$ , density of water $= 1000 k g m^{- 3}$ .

Discussion

4283.	A body travelling at a speed greater than that of sound is said to be travelling at ___.
Answer» A body travelling at a speed greater than that of sound is said to be travelling at ___.

Discussion

4284.	What is a projector? Is it possible to build the projector at home ?
Answer» What is a projector? Is it possible to build the projector at home ?

Discussion

4285.	How can we describe the position of an object?
Answer» How can we describe the position of an object?

Discussion

4286.	What is a compound microscope?
Answer» What is a compound microscope?

Discussion

4287.	In a vernier calliper 19 main scale divisions concide with 20 vernier scale divisions .if the main scale has 20 divisions in a centimetre, calculate L.C. of vernier calliper (ans 0.0025 cm)
Answer» In a vernier calliper 19 main scale divisions concide with 20 vernier scale divisions .if the main scale has 20 divisions in a centimetre, calculate L.C. of vernier calliper (ans 0.0025 cm)

Discussion

4288.	A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity=10ms−2.
Answer» A man lifts a luggage of $10 k g$ from the ground and puts it on his head $1.7 m$ above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity $= 10 m s^{- 2}$ .

Discussion

4289.	Gravitational force on the surface of the moon is only 16 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?
Answer» Gravitational force on the surface of the moon is only $\frac{1}{6}$ as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?

Discussion

4290.	A candle is placed in front of a concave spherical mirror on its principal axis at a distance of (43) f from the pole of the mirror (here f is the focal length of the mirror). The candle is arranged at right angles to the axis. The image of the candle in the concave mirror impinges upon a convex mirror of focal length 2f. The distance between the mirrors is 3f and their axis coincide. The image of the candle in the first mirror plays the part of a virtual object with respect to the second mirror and gives a real image arranged between the two mirrors. Then the total linear magnification of the system is (only magnitude)
Answer» A candle is placed in front of a concave spherical mirror on its principal axis at a distance of $(\frac{4}{3})$ $f$ from the pole of the mirror (here $f$ is the focal length of the mirror). The candle is arranged at right angles to the axis. The image of the candle in the concave mirror impinges upon a convex mirror of focal length $2 f$ . The distance between the mirrors is $3 f$ and their axis coincide. The image of the candle in the first mirror plays the part of a virtual object with respect to the second mirror and gives a real image arranged between the two mirrors. Then the total linear magnification of the system is (only magnitude)

Discussion

4291.	A person stands on a spring balance at the equator. If the speed of earth's rotation increased by such an amount that the balance reading is half the true weight, what will be the length of the day in this case?
Answer» A person stands on a spring balance at the equator. If the speed of earth's rotation increased by such an amount that the balance reading is half the true weight, what will be the length of the day in this case?

Discussion

4292.	The density of gold is 19 g/ cm^3.find the volume of 95g of gold.
Answer» The density of gold is 19 g/ cm^3.find the volume of 95g of gold.

Discussion

4293.	A boy starting from rest is accelerated uniformly for 30 s. If x1,x2,x3 are the distance travelled in first 10 s, next 10 s and last 10 s respectively, then x1:x2:x3 is
Answer» A boy starting from rest is accelerated uniformly for $30 s$ . If $x_{1}, x_{2}, x_{3}$ are the distance travelled in first $10 s$ , next $10 s$ and last $10 s$ respectively, then $x_{1} : x_{2} : x_{3}$ is

Discussion

4294.	A projectile just passes over the wall whose topmost point is at (4,4).It falls 14m away from the wall . Find the magnitude and direction of initial velociy
Answer» A projectile just passes over the wall whose topmost point is at (4,4).It falls 14m away from the wall . Find the magnitude and direction of initial velociy

Discussion

4295.	The electrical pulses from a microphone are strengthened using a/an ___.
Answer» The electrical pulses from a microphone are strengthened using a/an ___.

Discussion

4296.	Explain Newton's Laws of Motion with an example.
Answer» Explain Newton's Laws of Motion with an example.

Discussion

4297.	All resistances in figure are 1 Ω each. The value of current "I" is
Answer» All resistances in figure are 1 $Ω$ each. The value of current " $I$ " is

Discussion

4298.	How one can differentiate between a heat and temperature?
Answer» How one can differentiate between a heat and temperature?

Discussion

4299.	Average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is:
Answer» Average velocity of a particle moving in a straight line, with constant acceleration $a$ and initial velocity $u$ in first $t$ seconds is:

Discussion

4300.	The potential energy of the body is 960J. Determine the height of the body if its weight is 30 Kg.
Answer» The potential energy of the body is 960J. Determine the height of the body if its weight is 30 Kg.

Discussion

Explore topic-wise InterviewSolutions in .

A body of mass m is projected from ground with speed u at an angle theta with horizontal. The power delivered by gravity to it at half of maximum height from ground is

A barometer kept in an elevator reads 76cm when the elevator is accelerating upwards.The most likely pressure inside the elevator (in cm of Hg)

Question 4Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will ___ .

Use the following information to answer the next question. Thedifference between the momentums of which two bodies will be the maximum?

The speed of the body in the time interval 14 to 18 seconds is

The distance between two consecutive crests or trough of a wave is called its ___.

How the spark coming out of a grinding stone and mud from wheels of a moving vehicle represent inertia of direction

A particle which is experiencing a force, given by →F=3^i−12^j, undergoes a displacement of →d=4^i. If the particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement ?

Calculate the force between two objects having masses of 50 kg and 100 kg respectively and separated by a distance of 10 m.

A bat in search of prey hears the echo of its squeak after 0.1 s. How far is the prey from the bat, if the squeak got reflected from it?(speed of sound in air =340 m/s)

Question 1(iv)The following graph shows the temperature of a patient in a hospital, recorded every hourWhat was the temperature at 1.30p.m.? How did you arrive at your answer?

6. When an oscillator completes 100 oscillations its amplitude reduced to 1/3 of initial value. What will be the amplitude when it completes 200 oscillation? 1) 1/8 2) 2/3 3) 1/6 4) 1/9

What happens to the image, if a convex lens is made up of two different transparent materials as shown in figure?

The position of a body moving along x-axis at timet is given by x =travelled by body in time interval t = 0 to(t24t+6) m. The distance= 3 s is(1) 5 m(3) 4 m(2) 7 m(4) 3 m

A 60 g bullet fired from a 5 kg gun leaves with a speed of 500 m/s. Find the speed (velocity) with which the gun recoils (jerks backwards).

A boy playing on the roof of a building(10m high), throws a ball with a speed of 10 m/s at an angle of 30^° to the horizontal. How far from the starting point will be the ball at a height of 10 m from the ground?

Motion of a satellite in circular orbit is an example of ___.

The density of water is 1 g/cc. The numerical value of density of water in new unit kg/m^3 is Options: a) 1 b) 10 c) 10^2 d) 10^3

If the direction of electric current in a solenoid, when viewed from one of its ends, is anticlockwise. The pole of this end of the solenoid is ___ .

28.A small plane mirror is rotating at a constant frequency of n rotation per second. with what linear velocity will a light spot move along a spherical screen of radius of curvature R metres if the mirror at the centre of curvature of the screen?

What are renewable sources of energy?

Case 1: A bottle is fully filled with water and a hole is made at the bottom. Case 2: A bottle is fully filled with water and a hole is made in the middle of it. In which case, the water comes out with greater pressure?

In the circuit diagram. Find(i) total resistance(ii) current shown by the ammeter A. [3 MARKS]

The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be

Select non-conductors of electricity from the following

ntA wire has a mass (0.3+-0.003)g, radius(0.5+-0.005)mm and length (6+-0.06)cm. The maximum percentage error in measurement of density isn nt(1)1 (2)2n nt(3)3 (4)4n

Given that a body falling freely passes through5390 cm in the sixth second. Find the value of g(1) 1000 cm/s2(2) 900 cm/s2(3) 950 cm/s2(4) 980 cm/s2

What is the speed of a car if it goes 200 miles in 4 hours?

In a hydraulic lift, there is a piston at one end and a car of mass 400 kg balanced on the load side. If the cross sectional area of load side is 20 m2 and that of the piston is 5 m2, what is the force applied by the piston? [Take g=10 ms−2]

The distance of an object from the pole of a concave mirror is equal to its radius of curvature. The image must be which one- a) real b) inverted c) same sized d) erect?

If the atmosphere of the Earth is replaced with water, to what extent the water level must rise so as to maintain the same pressure [105 N m−2] on Earth's surface? [Assume nothing above the water surface. take g=10 m s−2, density of water =1000 kg m−3.

A body travelling at a speed greater than that of sound is said to be travelling at ___.

What is a projector? Is it possible to build the projector at home ?

How can we describe the position of an object?

What is a compound microscope?

In a vernier calliper 19 main scale divisions concide with 20 vernier scale divisions .if the main scale has 20 divisions in a centimetre, calculate L.C. of vernier calliper (ans 0.0025 cm)

A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity=10ms−2.

Gravitational force on the surface of the moon is only 16 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth?

A person stands on a spring balance at the equator. If the speed of earth's rotation increased by such an amount that the balance reading is half the true weight, what will be the length of the day in this case?

The density of gold is 19 g/ cm^3.find the volume of 95g of gold.

A boy starting from rest is accelerated uniformly for 30 s. If x1,x2,x3 are the distance travelled in first 10 s, next 10 s and last 10 s respectively, then x1:x2:x3 is

A projectile just passes over the wall whose topmost point is at (4,4).It falls 14m away from the wall . Find the magnitude and direction of initial velociy

The electrical pulses from a microphone are strengthened using a/an ___.

Explain Newton's Laws of Motion with an example.

All resistances in figure are 1 Ω each. The value of current "I" is

How one can differentiate between a heat and temperature?

Average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is:

The potential energy of the body is 960J. Determine the height of the body if its weight is 30 Kg.