13232 + Interview Questions in Physics Page 136 InterviewSolution

6751.	Find the moment of inertia through com of a solid hemisphere. The axis is at angle 37 degrees with the horizontal.
Answer» Find the moment of inertia through com of a solid hemisphere. The axis is at angle 37 degrees with the horizontal.

Discussion

6752.	Write an expression for the pressure at a point insid a liquid.
Answer» Write an expression for the pressure at a point insid a liquid.

Discussion

6753.	Question 13An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be(a) 2 N(b) 8 N(c) 10 N(d) 12 N
Answer» Question 13 An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be (a) 2 N (b) 8 N (c) 10 N (d) 12 N

Discussion

6754.	From the top of a tower 100 m in height a ball is dropped and the same instant another ball is projected vertically upwards from the ground so that it just reaches the top of tower. At what height do the two balls pass one another?
Answer» From the top of a tower 100 m in height a ball is dropped and the same instant another ball is projected vertically upwards from the ground so that it just reaches the top of tower. At what height do the two balls pass one another?

Discussion

6755.	Find the equivalent resistance between A and B.
Answer» Find the equivalent resistance between $A$ and $B$ .

Discussion

6756.	In order to cover a certain distance in a shorter time span, the object should have a greater _________.
Answer» In order to cover a certain distance in a shorter time span, the object should have a greater _________.

Discussion

6757.	if n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u, then force on surface is: (WHY CAN'T WE USE "F=nmv" HERE?)
Answer» if n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u, then force on surface is: (WHY CAN'T WE USE "F=nmv" HERE?)

Discussion

6758.	why is the work done against gravity is mgh
Answer» why is the work done against gravity is mgh

Discussion

6759.

The following is the distance-time table of an object in motion: Time in seconds Distance in metres 0 0 1 1 2 8 3 27 4 64 5 125 6 216 7 343 (a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?(b)What do you infer about the forces acting on the object?

Answer»

The following is the distance-time table of an object in motion:

Time in seconds	Distance in metres
0	0
1	1
2	8
3	27
4	64
5	125
6	216
7	343

(a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?

(b)What do you infer about the forces acting on the object?

Discussion

6760.	If a body covers unequal distances in equal intervals of time, its motion is
Answer» If a body covers unequal distances in equal intervals of time, its motion is

Discussion

6761.	If the angle between two mirrors, touching each other along their vertical edges is increased from 60o to 90o :
Answer» If the angle between two mirrors, touching each other along their vertical edges is increased from 60^o to 90^o :

Discussion

6762.	The velocity-time graph of a body falling from rest under gravity and rebounding from a solid surface is represented by
Answer» The velocity-time graph of a body falling from rest under gravity and rebounding from a solid surface is represented by

Discussion

6763.	A boy starts from a point O and travels 50 m in 30 s. He returns to the same point in 20 s. Calculate the average velocity of the boy.0
Answer» A boy starts from a point $O$ and travels $50 m$ in $30 s$ . He returns to the same point in $20 s$ . Calculate the average velocity of the boy. 0

Discussion

6764.	A particle is moving along the x axis such that it's velocity varies with time according to v=(3m/s) t-(2m/s)t. Find the velocity at t=1s and average velocity of the particle for the interval t=0 to t=5s
Answer» A particle is moving along the x axis such that it's velocity varies with time according to v=(3m/s) t-(2m/s)t. Find the velocity at t=1s and average velocity of the particle for the interval t=0 to t=5s

Discussion

6765.	Can a body have mass but no weight ? Give reasons for your answer.
Answer» Can a body have mass but no weight ? Give reasons for your answer.

Discussion

6766.	What is the difference between reverberation and echo?
Answer» What is the difference between reverberation and echo?

Discussion

6767.	What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?
Answer» What is the acceleration of a van that starts from rest and attains a speed of $20 m s^{- 1}$ in $25 s$ ?

Discussion

6768.	27. A train P takes 40 second to cross a train 800 m long and having a speed of 30 metre per second in the opposite direction. It takes 120 second to cross another train twice its length and having the same speed and moving in the opposite direction to it. Find the length of the train P in metre.
Answer» 27. A train P takes 40 second to cross a train 800 m long and having a speed of 30 metre per second in the opposite direction. It takes 120 second to cross another train twice its length and having the same speed and moving in the opposite direction to it. Find the length of the train P in metre.

Discussion

6769.	Q 54/54 Auniform solid cylinder of mass M and radius Ris mountedon an axle supported in frictionless bearings. A light cord is wrappedaround the cylinder and a steady downward pull F is exerted on thecord. The angular acceleration of the cylinder is
Answer» Q 54/54 Auniform solid cylinder of mass M and radius Ris mountedon an axle supported in frictionless bearings. A light cord is wrappedaround the cylinder and a steady downward pull F is exerted on thecord. The angular acceleration of the cylinder is

Discussion

6770.	Determine the velocity of image with respect to mirror:
Answer» Determine the velocity of image with respect to mirror:

Discussion

6771.	ntTwo masses 5 Kg nd 3 Kg are suspended from the ends of an unstretchable light string pasing over a frictionless pulley. When the masses are released, the thrust on the pully is (g = 10 mis-2).n
Answer» ntTwo masses 5 Kg nd 3 Kg are suspended from the ends of an unstretchable light string pasing over a frictionless pulley. When the masses are released, the thrust on the pully is (g = 10 mis-2).n

Discussion

6772.	The distance between a real object and its image in a convex mirror of focal length 12 cm is 32 cm. Find the size of image if the object size is 1 cm.
Answer» The distance between a real object and its image in a convex mirror of focal length $12 cm$ is $32 cm$ . Find the size of image if the object size is $1 cm$ .

Discussion

6773.	On which factor does the value of universal gravitational constant G depends on?
Answer» On which factor does the value of universal gravitational constant G depends on?

Discussion

6774.	In case of a body exhibiting circlar motion, sometimes centripetal force is considered sometimeas centirfugal force is considered,to calculate net force on a body so,,when to consider which force
Answer» In case of a body exhibiting circlar motion, sometimes centripetal force is considered sometimeas centirfugal force is considered,to calculate net force on a body so,,when to consider which force

Discussion

6775.	what is the dimension of relative density ,force =change in momentum / time .
Answer» what is the dimension of relative density ,force =change in momentum / time .

Discussion

6776.	A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cms−1 to 15 cms−1 in 2 seconds. What is its acceleration?
Answer» A block is sliding down on an inclined plane. The velocity changes at a constant rate from $10 c m s^{- 1}$ to $15 c m s^{- 1}$ in $2$ seconds. What is its acceleration?

Discussion

6777.	The gravitational pull of the Moon results in ___.
Answer» The gravitational pull of the Moon results in ___.

Discussion

6778.	According to conventions, the power of corrective lens used for which defect has a positive power?
Answer» According to conventions, the power of corrective lens used for which defect has a positive power?

Discussion

6779.	Which of the following is an incorrect reason for the following observation, a spaceship continues moving in space with uniform speed because:
Answer» Which of the following is an incorrect reason for the following observation, a spaceship continues moving in space with uniform speed because:

Discussion

6780.	Write the symbol and units of the following Physical Quantities : a) weight b) work c) pressure d) momentum e) power
Answer» Write the symbol and units of the following Physical Quantities : a) weight b) work c) pressure d) momentum e) power

Discussion

6781.	Consider a hypothetical planet which is very long and cylindrical. The density of the planet is ρ and its radius is R. The possible orbital speed of the satellite in moving around the planet in circular orbit in a plane which is perpendicular to the axis of the planet is √xπGρR. The value of x is ________.
Answer» Consider a hypothetical planet which is very long and cylindrical. The density of the planet is $ρ$ and its radius is $R$ . The possible orbital speed of the satellite in moving around the planet in circular orbit in a plane which is perpendicular to the axis of the planet is $\sqrt{x π G ρ} R$ . The value of $x$ is ________.

Discussion

6782.	During uniformly accelerated motion, displacement of an object is proportional to _____ of time.
Answer» During uniformly accelerated motion, displacement of an object is proportional to _____ of time.

Discussion

6783.	If velocity v of a particle moving on straight line as a function of time t is given as v=5-t, then the dis†an ce covered by particle in first 10 seconds is i. 5m ii. 15m iii. 25m iv. 50
Answer» If velocity v of a particle moving on straight line as a function of time t is given as v=5-t, then the dis†an ce covered by particle in first 10 seconds is i. 5m ii. 15m iii. 25m iv. 50

Discussion

6784.	When a body falls freely towards the earth, its total energy
Answer» When a body falls freely towards the earth, its total energy

Discussion

6785.	A car moving at a constant speed of 54 km/h comes to rest in 2.5 seconds. The car covers 5 m after driver applies the brakes. The total force applied to stop the car is 1000 N. Calculate the power dissipated in stopping the car.
Answer» A car moving at a constant speed of $54 k m / h$ comes to rest in $2.5 s e c o n d s$ . The car covers $5 m$ after driver applies the brakes. The total force applied to stop the car is $1000 N$ . Calculate the power dissipated in stopping the car.

Discussion

6786.	The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is : (a) velocity is uniform (b) acceleration is uniform (c) Both velocity and acceleration are uniform (d) neither velocity nor acceleration is uniform.
Answer» The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is : (a) velocity is uniform (b) acceleration is uniform (c) Both velocity and acceleration are uniform (d) neither velocity nor acceleration is uniform.

6786.

The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is : (a) velocity is uniform (b) acceleration is uniform (c) Both velocity and acceleration are uniform (d) neither velocity nor acceleration is uniform.

Answer»

The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is :

(a) velocity is uniform

(b) acceleration is uniform

(c) Both velocity and acceleration are uniform

(d) neither velocity nor acceleration is uniform.

Discussion

6787.	at what distance from convex mirror of focii 3 cm should a boy stand so that his image has height equal to half of originally height?
Answer» at what distance from convex mirror of focii 3 cm should a boy stand so that his image has height equal to half of originally height?

Discussion

6788.	A particle moves with velocity v1 for time t1 and v2 for time t2 along a straight line. The magnitude of the average acceleration is
Answer» A particle moves with velocity $v_{1}$ for time $t_{1}$ and $v_{2}$ for time $t_{2}$ along a straight line. The magnitude of the average acceleration is

Discussion

6789.	Explain the derivation of v2=u2+2as
Answer» Explain the derivation of v2=u2+2as

Discussion

6790.	A person is standing between two cliffs. He claps and hears two echoes, one after 3 seconds and the other after 5 seconds. If the velocity of sound in air = 336ms. Find the separation between the two cliffs.
Answer» A person is standing between two cliffs. He claps and hears two echoes, one after 3 seconds and the other after 5 seconds. If the velocity of sound in air = 336 $\frac{m}{s}$ . Find the separation between the two cliffs.

6790.

A person is standing between two cliffs. He claps and hears two echoes, one after 3 seconds and the other after 5 seconds. If the velocity of sound in air = 336ms. Find the separation between the two cliffs.

Answer»

A person is standing between two cliffs. He claps and hears two echoes, one after 3 seconds and the other after 5 seconds. If the velocity of sound in air = 336 $\frac{m}{s}$ . Find the separation between the two cliffs.

Discussion

6791.	A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.
Answer» A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.

Discussion

6792.	the loudness of a source of sound is increasez by 10db by how many times does intensity increase??detailed solution.
Answer» the loudness of a source of sound is increasez by 10db by how many times does intensity increase??detailed solution.

Discussion

6793.	A spherical capacitor is made of two conducting spherical shells of radii p=5 cm and q=15 cm. The space between the shells is filled with a dielectric of dielectric constant K=10 upto a radius r=9 cm as shown in the figure. Calculate the capacitance (in pF). [Nearest integer value]
Answer» A spherical capacitor is made of two conducting spherical shells of radii $p = 5 cm$ and $q = 15 cm$ . The space between the shells is filled with a dielectric of dielectric constant $K = 10$ upto a radius $r = 9 cm$ as shown in the figure. Calculate the capacitance (in $pF$ ). [Nearest integer value]

Discussion

6794.	The binding energies of nuclei X and Y are E1 and E2 respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then
Answer» The binding energies of nuclei $X$ and $Y$ are $E_{1}$ and $E_{2}$ respectively. Two atoms of $X$ fuse to give one atom of $Y$ and an energy $Q$ is released. Then

Discussion

6795.	The masses of two planets are in the ratio 1:2. 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. Their radii are in the ratio 1:2. The acceleration due to gravity on the planets is in the ratio:

Discussion

6796.	SI unit of area is ____
Answer» SI unit of area is ____

Discussion

6797.	Two bodies of equal masses are placed at heights h and 2h. Find the ratio of their gravitational potential energies.
Answer» Two bodies of equal masses are placed at heights h and 2h. Find the ratio of their gravitational potential energies.

Discussion

6798.	The commercial unit of power is kWh, which is equal to:
Answer» The commercial unit of power is kWh, which is equal to:

Discussion

6799.	A homogeneous solid cylinder of length L(L < H2) . Cross-sectional area A5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P0 . Then density D of solid is given by
Answer» A homogeneous solid cylinder of length L(L < $\frac{H}{2}$ ) . Cross-sectional area $\frac{A}{5}$ is immersed such that it floats with its axis vertical at the liquid-liquid interface with length $\frac{L}{4}$ in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure $P_{0}$ . Then density D of solid is given by

6799.

A homogeneous solid cylinder of length L(L < H2) . Cross-sectional area A5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P0 . Then density D of solid is given by

Answer»

A homogeneous solid cylinder of length L(L < $\frac{H}{2}$ ) . Cross-sectional area $\frac{A}{5}$ is immersed such that it floats with its axis vertical at the liquid-liquid interface with length $\frac{L}{4}$ in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure $P_{0}$ . Then density D of solid is given by

Discussion

6800.	If objects of the same volume displace the same amount of water,the how did Archimedes's gold crown experiment work?
Answer» If objects of the same volume displace the same amount of water,the how did Archimedes's gold crown experiment work?

Discussion

Explore topic-wise InterviewSolutions in .

Find the moment of inertia through com of a solid hemisphere. The axis is at angle 37 degrees with the horizontal.

Write an expression for the pressure at a point insid a liquid.

Question 13An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be(a) 2 N(b) 8 N(c) 10 N(d) 12 N​​​​​​​

From the top of a tower 100 m in height a ball is dropped and the same instant another ball is projected vertically upwards from the ground so that it just reaches the top of tower. At what height do the two balls pass one another?

Find the equivalent resistance between A and B.

In order to cover a certain distance in a shorter time span, the object should have a greater _________.

if n balls hit elastically and normally on a surface per unit time and all balls of mass m are moving with same velocity u, then force on surface is: (WHY CAN'T WE USE "F=nmv" HERE?)

why is the work done against gravity is mgh

If a body covers unequal distances in equal intervals of time, its motion is

If the angle between two mirrors, touching each other along their vertical edges is increased from 60o to 90o :

The velocity-time graph of a body falling from rest under gravity and rebounding from a solid surface is represented by

A boy starts from a point O and travels 50 m in 30 s. He returns to the same point in 20 s. Calculate the average velocity of the boy.0

A particle is moving along the x axis such that it's velocity varies with time according to v=(3m/s) t-(2m/s)t. Find the velocity at t=1s and average velocity of the particle for the interval t=0 to t=5s

Can a body have mass but no weight ? Give reasons for your answer.

What is the difference between reverberation and echo?

What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?

27. A train P takes 40 second to cross a train 800 m long and having a speed of 30 metre per second in the opposite direction. It takes 120 second to cross another train twice its length and having the same speed and moving in the opposite direction to it. Find the length of the train P in metre.

Q 54/54 Auniform solid cylinder of mass M and radius Ris mountedon an axle supported in frictionless bearings. A light cord is wrappedaround the cylinder and a steady downward pull F is exerted on thecord. The angular acceleration of the cylinder is

Determine the velocity of image with respect to mirror:

ntTwo masses 5 Kg nd 3 Kg are suspended from the ends of an unstretchable light string pasing over a frictionless pulley. When the masses are released, the thrust on the pully is (g = 10 mis-2).n

The distance between a real object and its image in a convex mirror of focal length 12 cm is 32 cm. Find the size of image if the object size is 1 cm.

On which factor does the value of universal gravitational constant G depends on?

In case of a body exhibiting circlar motion, sometimes centripetal force is considered sometimeas centirfugal force is considered,to calculate net force on a body so,,when to consider which force

what is the dimension of relative density ,force =change in momentum / time .

A block is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cms−1 to 15 cms−1 in 2 seconds. What is its acceleration?

The gravitational pull of the Moon results in ___.

According to conventions, the power of corrective lens used for which defect has a positive power?

Which of the following is an incorrect reason for the following observation, a spaceship continues moving in space with uniform speed because:

Write the symbol and units of the following Physical Quantities : a) weight b) work c) pressure d) momentum e) power

During uniformly accelerated motion, displacement of an object is proportional to _____ of time.

If velocity v of a particle moving on straight line as a function of time t is given as v=5-t, then the dis†an ce covered by particle in first 10 seconds is i. 5m ii. 15m iii. 25m iv. 50

When a body falls freely towards the earth, its total energy

A car moving at a constant speed of 54 km/h comes to rest in 2.5 seconds. The car covers 5 m after driver applies the brakes. The total force applied to stop the car is 1000 N. Calculate the power dissipated in stopping the car.

The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is : (a) velocity is uniform (b) acceleration is uniform (c) Both velocity and acceleration are uniform (d) neither velocity nor acceleration is uniform.

at what distance from convex mirror of focii 3 cm should a boy stand so that his image has height equal to half of originally height?

A particle moves with velocity v1 for time t1 and v2 for time t2 along a straight line. The magnitude of the average acceleration is

Explain the derivation of v2=u2+2as

A person is standing between two cliffs. He claps and hears two echoes, one after 3 seconds and the other after 5 seconds. If the velocity of sound in air = 336ms. Find the separation between the two cliffs.

A force of magnitude 35 N acting on a body of mass 4 kg increases its kinetic energy from 0 J to 210 J. The displacement of the body during this interval is___.

the loudness of a source of sound is increasez by 10db by how many times does intensity increase??detailed solution.

A spherical capacitor is made of two conducting spherical shells of radii p=5 cm and q=15 cm. The space between the shells is filled with a dielectric of dielectric constant K=10 upto a radius r=9 cm as shown in the figure. Calculate the capacitance (in pF). [Nearest integer value]

The binding energies of nuclei X and Y are E1 and E2 respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then

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

SI unit of area is ____

Two bodies of equal masses are placed at heights h and 2h. Find the ratio of their gravitational potential energies.

The commercial unit of power is kWh, which is equal to:

If objects of the same volume displace the same amount of water,the how did Archimedes's gold crown experiment work?

Question 13An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be(a) 2 N(b) 8 N(c) 10 N(d) 12 N