13232 + Interview Questions in Physics Page 59 InterviewSolution

2901.	A cylindrical body of cross - sectional area A, height H and density ρs, is immersed to a depth hin a liquid of density ρ, and tied to the bottom with a string. The tension in the string is
Answer» A cylindrical body of cross - sectional area A, height H and density ρ s , is immersed to a depth h in a liquid of density ρ , and tied to the bottom with a string. The tension in the string is

Discussion

2902.	63. the ratio of radius and circumference will be__
Answer» 63. the ratio of radius and circumference will be__

Discussion

2903.	What is potential energy?
Answer» What is potential energy?

Discussion

2904.	The two thigh bones (femures), each of cross-sectional area 10 cm2 support the upper part of a person of mass 50 kg. The average pressure sustained by the femures is(1) 2.5 x 105 N/m2(3) 5 x 105 N/m2(2) 4 x 105 N/m2(4) 106 N/m2
Answer» The two thigh bones (femures), each of cross-sectional area 10 cm2 support the upper part of a person of mass 50 kg. The average pressure sustained by the femures is(1) 2.5 x 105 N/m2(3) 5 x 105 N/m2(2) 4 x 105 N/m2(4) 106 N/m2

Discussion

2905.	What is relativistic charged particle?
Answer» What is relativistic charged particle?

Discussion

2906.	17.1.Complete magnetic sheilding is not possible. 2.A bar magnet's dipole moment can be always found out in the presence of an external field. Why are these two statements incorrect?
Answer» 17.1.Complete magnetic sheilding is not possible. 2.A bar magnet's dipole moment can be always found out in the presence of an external field. Why are these two statements incorrect?

Discussion

2907.	How do airbags reduce damage to the passenger during an accident?
Answer» How do airbags reduce damage to the passenger during an accident?

Discussion

2908.	Q3) In the passage, the Dark Age refers to-
Answer» Q3) In the passage, the Dark Age refers to-

Discussion

2909.	The force responsible for moon revolving around earth is
Answer» The force responsible for moon revolving around earth is

Discussion

2910.	A cuboidal piece of wood has dimensions a, b and c. Its relative density is d. It is floating in a large body of water such that side a is vertical. It is pushed down a bit and released. The time period of SHM executed by it is
Answer» A cuboidal piece of wood has dimensions a, b and c. Its relative density is d. It is floating in a large body of water such that side a is vertical. It is pushed down a bit and released. The time period of SHM executed by it is

Discussion

2911.	27.A ball is thrown vertically upward . It has a speed of 10m/s when it has reached one half of its maximum height . How high does the ball rise ?
Answer» 27.A ball is thrown vertically upward . It has a speed of 10m/s when it has reached one half of its maximum height . How high does the ball rise ?

Discussion

2912.	Which of the following is precise but not accurate?
Answer» Which of the following is precise but not accurate?

Discussion

2913.	Two identical bullets are fired. The first one is fired from a gun and the second one from a rifle. The rate of change of momentum of both bullets is same. Which weapon will recoil with a greater force?
Answer» Two identical bullets are fired. The first one is fired from a gun and the second one from a rifle. The rate of change of momentum of both bullets is same. Which weapon will recoil with a greater force?

2913.

Two identical bullets are fired. The first one is fired from a gun and the second one from a rifle. The rate of change of momentum of both bullets is same. Which weapon will recoil with a greater force?

Answer»

Two identical bullets are fired. The first one is fired from a gun and the second one from a rifle. The rate of change of momentum of both bullets is same. Which weapon will recoil with a greater force?

Discussion

2914.	Why Rs is used when already R L is used in the circuit?( In zener diode)
Answer» Why Rs is used when already R L is used in the circuit?( In zener diode)

Discussion

2915.	A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5s. The rate at which floor warms up is
Answer» A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5s. The rate at which floor warms up is

Discussion

2916.	Is tension a conservative force or non conservative?
Answer» Is tension a conservative force or non conservative?

Discussion

2917.	A coin is thrown in a vertically upward direction with a velocity of 5 ms−1. If the acceleration of the coin during its motion is 10 ms−2 in the downward direction, what will be the height attained by the coin and how much time will it take to reach there ?
Answer» A coin is thrown in a vertically upward direction with a velocity of $5 m s^{- 1}$ . If the acceleration of the coin during its motion is $10 m s^{- 2}$ in the downward direction, what will be the height attained by the coin and how much time will it take to reach there ?

Discussion

2918.	50 kilo joule of energy causes or displacement of 25 metre in a body in the direction of force in 2.5 seconds. find the power in a unit of horsepower
Answer» 50 kilo joule of energy causes or displacement of 25 metre in a body in the direction of force in 2.5 seconds. find the power in a unit of horsepower

Discussion

2919.	A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated?
Answer» A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated?

Discussion

2920.	Is there change in value of acceleration of particle executing S.H.M ?
Answer» Is there change in value of acceleration of particle executing S.H.M ?

Discussion

2921.	A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom.Find (a) average speed and (b) average velocity of the boy.
Answer» A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed and (b) average velocity of the boy.

Discussion

2922.	The initial velocity of a particle moving along x-axisis u (at t 0 and x 0) and its acceleration a isgiven by a kx. Which of the following equation iscorrect between its velocity (v) and position (x)? (1)v2-u2=2kx (2)v2=u2+2kx2 (3) v2=u2 + kx2 (4)v2+u2= 2kx
Answer» The initial velocity of a particle moving along x-axisis u (at t 0 and x 0) and its acceleration a isgiven by a kx. Which of the following equation iscorrect between its velocity (v) and position (x)? (1)v2-u2=2kx (2)v2=u2+2kx2 (3) v2=u2 + kx2 (4)v2+u2= 2kx

Discussion

2923.	25. A body travels in a straight line and covers two thirds of the distance with 30km/he and one third with speed v. If average velocity is 20km/hr what is value of v
Answer» 25. A body travels in a straight line and covers two thirds of the distance with 30km/he and one third with speed v. If average velocity is 20km/hr what is value of v

Discussion

2924.	how to find mass of photon?hc/(wave length)=mc^{2 }but this mass is also moving with speed of light so why dont we add 1/2(mc^2)
Answer» how to find mass of photon?hc/(wave length)=mc^{2 }but this mass is also moving with speed of light so why dont we add 1/2(mc^2)

Discussion

2925.	Acceleration due to gravity g near the surface of a planet of mass M and radius R is given by: G is the Universal constant.
Answer» Acceleration due to gravity $g$ near the surface of a planet of mass $M$ and radius $R$ is given by: $G$ is the Universal constant.

Discussion

2926.	Calculate the force required to accelerate a car from rest to a velocity of 30 m s−1 in 10 seconds. The mass of the car is 1500 kg.
Answer» Calculate the force required to accelerate a car from rest to a velocity of $30 m s^{- 1}$ in $10 s e c o n d s$ . The mass of the car is $1500 k g$ .

Discussion

2927.	37. If radius of earth decreases by 10% ,the mass remaining unchanged, what will happen to the acceleration due to gravity? decrease/increase in %)
Answer» 37. If radius of earth decreases by 10% ,the mass remaining unchanged, what will happen to the acceleration due to gravity? decrease/increase in %)

Discussion

2928.	The voices of men, women and children are different due to:
Answer» The voices of men, women and children are different due to:

Discussion

2929.	In a given system of units 1 unit of mass=2kg,1 unit of length=5 m and 1 unit of time=5s.Then in this system,1N represents?
Answer» In a given system of units 1 unit of mass=2kg,1 unit of length=5 m and 1 unit of time=5s.Then in this system,1N represents?

Discussion

2930.	A mercury-in-glass thermometer has a stem of internal diameter 0.06 cm and contains 43 g of mercury. The mercury thread expands by 10 cm when the temperature changes from 0∘C to 50∘C. Find the coefficient of cubical expansion of mercury. Relative density of mercury = 13.6 and αglass=9×10−6K−1
Answer» A mercury-in-glass thermometer has a stem of internal diameter 0.06 cm and contains 43 g of mercury. The mercury thread expands by 10 cm when the temperature changes from $0^{\circ} C$ to $50^{\circ} C$ . Find the coefficient of cubical expansion of mercury. Relative density of mercury = 13.6 and $α_{g l a s s} = 9 \times 10^{- 6} K^{- 1}$

Discussion

2931.	11. According to the velocity-time graph given below, what is the initial velocity of the car?
Answer» 11. According to the velocity-time graph given below, what is the initial velocity of the car?

2931.

11. According to the velocity-time graph given below, what is the initial velocity of the car?

Answer»

11. According to the velocity-time graph given below, what is the initial velocity of the car?

Discussion

2932.	Paheli wrote a food chain in the following way:frog→eagle→insects→ grass→snakeThe chain is not in the correct order. Help her to write the food chain correctly.
Answer» Paheli wrote a food chain in the following way: frog→eagle→insects→ grass→snake The chain is not in the correct order. Help her to write the food chain correctly.

2932.

Paheli wrote a food chain in the following way:frog→eagle→insects→ grass→snakeThe chain is not in the correct order. Help her to write the food chain correctly.

Answer»

Paheli wrote a food chain in the following way:

frog→eagle→insects→ grass→snake

The chain is not in the correct order. Help her to write the food chain correctly.

Discussion

2933.	A ray of light is incident at 60∘, on a glass-air interface. Then the light ray will be ___. Use : [μglass = √2 , μair = 1]
Answer» A ray of light is incident at $60^{\circ}$ , on a glass-air interface. Then the light ray will be ___. Use : [ $μ_{g l a s s}$ = $\sqrt{2}$ , $μ_{a i r}$ = 1]

2933.

A ray of light is incident at 60∘, on a glass-air interface. Then the light ray will be ___. Use : [μglass = √2 , μair = 1]

Answer»

A ray of light is incident at $60^{\circ}$ , on a glass-air interface. Then the light ray will be ___.

Use : [ $μ_{g l a s s}$ = $\sqrt{2}$ , $μ_{a i r}$ = 1]

Discussion

2934.	Write the word in the blank space.A. The SI unit of force is_________ (Dyne, Newton, Joule)B. The air pressure on our body is equal to __________ pressure (Atmospheric, sea bottom, space)C. For a given object, the buoyant force in liquids of different ________ is__________ (the same, density, different, area)D. The SI unit of pressure is_______ (N/m3 , N/m2, kg/m2, pa/m2)
Answer» Write the word in the blank space. A. The SI unit of force is_________ (Dyne, Newton, Joule) B. The air pressure on our body is equal to __________ pressure (Atmospheric, sea bottom, space) C. For a given object, the buoyant force in liquids of different ________ is__________ (the same, density, different, area) D. The SI unit of pressure is_______ (N/m³, N/m², kg/m², pa/m²)

Discussion

2935.	When the current in a conductor is doubled, keeping other parameters constant, the heating effect of the current becomes ___ .
Answer» When the current in a conductor is doubled, keeping other parameters constant, the heating effect of the current becomes ___ .

Discussion

2936.	41. A particle moves in a circle of radius 5 cm with constant speed $time period 0.63 sec. The acceleration of particle is 1) 15 m/s 2) 25 m/s 3) 36 m/s 4) 5 m/s
Answer» 41. A particle moves in a circle of radius 5 cm with constant speed $time period 0.63 sec. The acceleration of particle is 1) 15 m/s 2) 25 m/s 3) 36 m/s 4) 5 m/s

Discussion

2937.	Two bar magnets repel when brought closer to each other. Identify the north pole of the plain bar magnet.
Answer» Two bar magnets repel when brought closer to each other. Identify the north pole of the plain bar magnet.

Discussion

2938.	One of Saturn’s moons is named Mimas. The orbital radius of Mimas is 1.87 x 108 m from Saturn. The mean orbital period of Mimas is approximately 23 hours. Its speed with which it revolves around Saturn is ________. (Assume that the path taken is circular.)
Answer» One of Saturn’s moons is named Mimas. The orbital radius of Mimas is 1.87 x $10^{8}$ m from Saturn. The mean orbital period of Mimas is approximately 23 hours. Its speed with which it revolves around Saturn is ________. (Assume that the path taken is circular.)

Discussion

2939.	A body having 5 kg mass is travelling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?
Answer» A body having 5 kg mass is travelling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?

Discussion

2940.	what is newton second law?
Answer» what is newton second law?

Discussion

2941.	if the intensity of sound is increased by factor of 30.then by how many decible the sound level will increase
Answer» if the intensity of sound is increased by factor of 30.then by how many decible the sound level will increase

Discussion

2942.	Which of the following cannot be the effect of force on a body?
Answer» Which of the following cannot be the effect of force on a body?

Discussion

2943.	Observe the following distance-time graph:Identify the respective speeds of the body when it moves from O (origin) to A and B to C.
Answer» Observe the following distance-time graph: Identify the respective speeds of the body when it moves from O (origin) to A and B to C.

Discussion

2944.	An Iron rod and a copper rod lie side by side. As the temperature is changed, the difference in the lengths of the rods remains constant at a value of 10 cm. Find the lengths at 0∘C. Coefficients of linear expansion of iron and copper are 1.1 × 10−6/∘C and 1.7 × 10−5/∘C respectively.
Answer» An Iron rod and a copper rod lie side by side. As the temperature is changed, the difference in the lengths of the rods remains constant at a value of 10 cm. Find the lengths at $0^{\circ} C$ . Coefficients of linear expansion of iron and copper are $1.1 \times 10^{- 6} /^{\circ} C$ and $1.7 \times 10^{- 5} /^{\circ} C$ respectively.

Discussion

2945.	Question 6(iii)A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graphHow far is the place of the merchant from the town?
Answer» Question 6(iii) A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph How far is the place of the merchant from the town?

Discussion

2946.	The radius of earth is about 6400 km and that of Mars is 3200 km. The mass of the earth is about 10 times the mass of Mars. An object weighs 200 N on the surface of Earth. Its weight on the surface of mars will be
Answer» The radius of earth is about 6400 km and that of Mars is 3200 km. The mass of the earth is about 10 times the mass of Mars. An object weighs 200 N on the surface of Earth. Its weight on the surface of mars will be

Discussion

2947.	A person of mass 60 kg is in a lift. Calculate 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. Calculate 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

2948.	Given mass of the planet Mars is 6 × 1023 kg and radius is 4.3 × 106 m. Calculate the weight of a man whose weight on earth is 600 N. (Given g on earth = 10 msec2)
Answer» Given mass of the planet Mars is 6 × $10^{23}$ kg and radius is 4.3 × $10^{6}$ m. Calculate the weight of a man whose weight on earth is 600 N. (Given g on earth = 10 $\frac{m}{{s e c}^{2}}$ )

Discussion

2949.	A pipe 20 cm long is closed at one end.Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz? (sound velocity in air=330 m/s)
Answer» A pipe 20 cm long is closed at one end.Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz? (sound velocity in air=330 m/s)

Discussion

2950.	What is sound? How is it produced?
Answer» What is sound? How is it produced?

Discussion

Explore topic-wise InterviewSolutions in .

A cylindrical body of cross - sectional area A, height H and density ρs, is immersed to a depth hin a liquid of density ρ, and tied to the bottom with a string. The tension in the string is

63. the ratio of radius and circumference will be__

What is potential energy?

The two thigh bones (femures), each of cross-sectional area 10 cm2 support the upper part of a person of mass 50 kg. The average pressure sustained by the femures is(1) 2.5 x 105 N/m2(3) 5 x 105 N/m2(2) 4 x 105 N/m2(4) 106 N/m2

What is relativistic charged particle?

17.1.Complete magnetic sheilding is not possible. 2.A bar magnet's dipole moment can be always found out in the presence of an external field. Why are these two statements incorrect?

How do airbags reduce damage to the passenger during an accident?

Q3) In the passage, the Dark Age refers to-

The force responsible for moon revolving around earth is

A cuboidal piece of wood has dimensions a, b and c. Its relative density is d. It is floating in a large body of water such that side a is vertical. It is pushed down a bit and released. The time period of SHM executed by it is

27.A ball is thrown vertically upward . It has a speed of 10m/s when it has reached one half of its maximum height . How high does the ball rise ?

Which of the following is precise but not accurate?

Two identical bullets are fired. The first one is fired from a gun and the second one from a rifle. The rate of change of momentum of both bullets is same. Which weapon will recoil with a greater force?

Why Rs is used when already R L is used in the circuit?( In zener diode)

A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5s. The rate at which floor warms up is

Is tension a conservative force or non conservative?

A coin is thrown in a vertically upward direction with a velocity of 5 ms−1. If the acceleration of the coin during its motion is 10 ms−2 in the downward direction, what will be the height attained by the coin and how much time will it take to reach there ?

50 kilo joule of energy causes or displacement of 25 metre in a body in the direction of force in 2.5 seconds. find the power in a unit of horsepower

A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated?

Is there change in value of acceleration of particle executing S.H.M ?

The initial velocity of a particle moving along x-axisis u (at t 0 and x 0) and its acceleration a isgiven by a kx. Which of the following equation iscorrect between its velocity (v) and position (x)? (1)v2-u2=2kx (2)v2=u2+2kx2 (3) v2=u2 + kx2 (4)v2+u2= 2kx

25. A body travels in a straight line and covers two thirds of the distance with 30km/he and one third with speed v. If average velocity is 20km/hr what is value of v

how to find mass of photon?hc/(wave length)=mc^{2 }but this mass is also moving with speed of light so why dont we add 1/2(mc^2)

Acceleration due to gravity g near the surface of a planet of mass M and radius R is given by: G is the Universal constant.

Calculate the force required to accelerate a car from rest to a velocity of 30 m s−1 in 10 seconds. The mass of the car is 1500 kg.

37. If radius of earth decreases by 10% ,the mass remaining unchanged, what will happen to the acceleration due to gravity? decrease/increase in %)

The voices of men, women and children are different due to:

In a given system of units 1 unit of mass=2kg,1 unit of length=5 m and 1 unit of time=5s.Then in this system,1N represents?

11. According to the velocity-time graph given below, what is the initial velocity of the car?

Paheli wrote a food chain in the following way:​​frog→eagle→insects→ grass→snake​​The chain is not in the correct order. Help her to write the food chain correctly.

A ray of light is incident at 60∘, on a glass-air interface. Then the light ray will be ___. Use : [μglass = √2 , μair = 1]

When the current in a conductor is doubled, keeping other parameters constant, the heating effect of the current becomes ___ .

41. A particle moves in a circle of radius 5 cm with constant speed $time period 0.63 sec. The acceleration of particle is 1) 15 m/s 2) 25 m/s 3) 36 m/s 4) 5 m/s

Two bar magnets repel when brought closer to each other. Identify the north pole of the plain bar magnet.

One of Saturn’s moons is named Mimas. The orbital radius of Mimas is 1.87 x 108 m from Saturn. The mean orbital period of Mimas is approximately 23 hours. Its speed with which it revolves around Saturn is ________. (Assume that the path taken is circular.)

A body having 5 kg mass is travelling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?

what is newton second law?

if the intensity of sound is increased by factor of 30.then by how many decible the sound level will increase

Which of the following cannot be the effect of force on a body?

Observe the following distance-time graph:Identify the respective speeds of the body when it moves from O (origin) to A and B to C.

An Iron rod and a copper rod lie side by side. As the temperature is changed, the difference in the lengths of the rods remains constant at a value of 10 cm. Find the lengths at 0∘C. Coefficients of linear expansion of iron and copper are 1.1 × 10−6/∘C and 1.7 × 10−5/∘C respectively.

Question 6(iii)A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graphHow far is the place of the merchant from the town?

The radius of earth is about 6400 km and that of Mars is 3200 km. The mass of the earth is about 10 times the mass of Mars. An object weighs 200 N on the surface of Earth. Its weight on the surface of mars will be

A person of mass 60 kg is in a lift. Calculate 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

Given mass of the planet Mars is 6 × 1023 kg and radius is 4.3 × 106 m. Calculate the weight of a man whose weight on earth is 600 N. (Given g on earth = 10 msec2)

A pipe 20 cm long is closed at one end.Which harmonic mode of the pipe is resonantly excited by a source of 1237.5 Hz? (sound velocity in air=330 m/s)

What is sound? How is it produced?

Paheli wrote a food chain in the following way:frog→eagle→insects→ grass→snakeThe chain is not in the correct order. Help her to write the food chain correctly.