13232 + Interview Questions in Physics Page 34 InterviewSolution

1651.	4.Assertion:Thepotentialbarrierofp-n junction diode cannot be measured byconnecting a sensitive voltmeter across itsterminals.Reason: The depletion layer can never offerinfinite resistance.(A) Assertion is True, Reason is True;Reason is a correct explanation forAssertion.(B) Assertion is True, Reason is True;Reason is not a correct explanation forAssertion.Assertion is True, Reason is False.(C)Assertion is False, Reason is True.(D)
Answer» 4.Assertion:Thepotentialbarrierofp-n junction diode cannot be measured byconnecting a sensitive voltmeter across itsterminals.Reason: The depletion layer can never offerinfinite resistance.(A) Assertion is True, Reason is True;Reason is a correct explanation forAssertion.(B) Assertion is True, Reason is True;Reason is not a correct explanation forAssertion.Assertion is True, Reason is False.(C)Assertion is False, Reason is True.(D)

Discussion

1652.	A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?
Answer» A truck moves at $36 k m h^{- 1}$ . It increases its velocity to $90 k m h^{- 1}$ in $0.1 m i n u t e$ . What is the acceleration of the truck?

1652.

A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?

Answer»

A truck moves at $36 k m h^{- 1}$ . It increases its velocity to $90 k m h^{- 1}$ in $0.1 m i n u t e$ .

What is the acceleration of the truck?

Discussion

1653.	Give an example where object is at rest and also in motion at the same time
Answer» Give an example where object is at rest and also in motion at the same time

Discussion

1654.	74. A body dropped from the top of a tower covers a distance 7x in the last second of its journey where x is the distance covered in first second how much time does it take to reach the ground ?
Answer» 74. A body dropped from the top of a tower covers a distance 7x in the last second of its journey where x is the distance covered in first second how much time does it take to reach the ground ?

Discussion

1655.	During the night, an area of low pressure is formed on which of the following?
Answer» During the night, an area of low pressure is formed on which of the following?

Discussion

1656.	Question 27Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?
Answer» Question 27 Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?

Discussion

1657.	Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Answer» Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

Discussion

1658.	The dis†an ce travelled by a body in the nth second is given by where u is initial velocity and a is acceleration. The dimensions of are
Answer» The dis†an ce travelled by a body in the nth second is given by where u is initial velocity and a is acceleration. The dimensions of are

Discussion

1659.	Sir/Mam A gun weighing 10 kg fires a bullet of 30 g with a velocity of 330 m/s . With what velocity does the gun recoil ? Pls help me solve this question Thnx
Answer» Sir/Mam A gun weighing 10 kg fires a bullet of 30 g with a velocity of 330 m/s . With what velocity does the gun recoil ? Pls help me solve this question Thnx

1659.

Sir/Mam A gun weighing 10 kg fires a bullet of 30 g with a velocity of 330 m/s . With what velocity does the gun recoil ? Pls help me solve this question Thnx

Answer»

Sir/Mam

A gun weighing 10 kg fires a bullet of 30 g with a velocity of 330 m/s . With what velocity does the gun recoil ?

Pls help me solve this question

Thnx

Discussion

1660.	A string 2.0 m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is -
Answer» A string $2.0 m$ long and fixed at its ends is driven by a $240 Hz$ vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is -

Discussion

1661.	4.A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to
Answer» 4.A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to

Discussion

1662.	pitch of a screw gauge is 1 mm and its cap is divided into 100 division. when nothing is placed between studs of the screw gauge, zero of circular scale is 8 division above the reference line and zero of main scale is not visible. Now , when a cylindrical wire is placed between its studs the main scale reading is 2 division and 15th division of circular scale coincides with reference line . Diameter of wire is
Answer» pitch of a screw gauge is 1 mm and its cap is divided into 100 division. when nothing is placed between studs of the screw gauge, zero of circular scale is 8 division above the reference line and zero of main scale is not visible. Now , when a cylindrical wire is placed between its studs the main scale reading is 2 division and 15th division of circular scale coincides with reference line . Diameter of wire is

Discussion

1663.	A ball of mass 1 kg is projected from the top of an incline with speed 5ms. It hits the incline at point A which is 3m down the slope and rebounds and hits again at the foot of the incline.Find the total work done by the gravity on the ball in the entire process.
Answer» A ball of mass $1 k g$ is projected from the top of an incline with speed $5 \frac{m}{s}$ . It hits the incline at point A which is $3 m$ down the slope and rebounds and hits again at the foot of the incline.Find the total work done by the gravity on the ball in the entire process.

1663.

A ball of mass 1 kg is projected from the top of an incline with speed 5ms. It hits the incline at point A which is 3m down the slope and rebounds and hits again at the foot of the incline.Find the total work done by the gravity on the ball in the entire process.

Answer»

A ball of mass $1 k g$ is projected from the top of an incline with speed $5 \frac{m}{s}$ .

It hits the incline at point A which is $3 m$ down the slope and rebounds and hits again at the foot of the incline.Find the total work done by the gravity on the ball in the entire process.

Discussion

1664.	A 120m long train is moving towards west at a speed of 10m/s. A small bird flying towards east with a speed of 5m/s crosses the train. Find the time taken by the bird to cross the train in second???
Answer» A 120m long train is moving towards west at a speed of 10m/s. A small bird flying towards east with a speed of 5m/s crosses the train. Find the time taken by the bird to cross the train in second???

Discussion

1665.	if acceleration due to gravity at dis†an ce d(
Answer» if acceleration due to gravity at dis†an ce d(

Discussion

1666.	3. Two organ pipes closed at one end are of equal diameter but different length . They produce 8 beat per sec when sounded simultaneously. The smaller organ pipe is 16 cm long and the speed of sound in air is 320m/sec . Find the length of other pipe.
Answer» 3. Two organ pipes closed at one end are of equal diameter but different length . They produce 8 beat per sec when sounded simultaneously. The smaller organ pipe is 16 cm long and the speed of sound in air is 320m/sec . Find the length of other pipe.

Discussion

1667.	Why weak nuclear force is lower than electro magnetic force
Answer» Why weak nuclear force is lower than electro magnetic force

Discussion

1668.	115.From the top of a tower two balls are thrown horizontally with velocities U1 and U2 in opposite directions simultaneously. If the velocities are perpendicular to each other just before they strike the ground the height of Tower is (a) (U1 + U2)/2g (b) (U1 - U2)/2g (c) (U1 + U2)/2g (d) (U1U2)/2g
Answer» 115.From the top of a tower two balls are thrown horizontally with velocities U1 and U2 in opposite directions simultaneously. If the velocities are perpendicular to each other just before they strike the ground the height of Tower is (a) (U1 + U2)/2g (b) (U1 - U2)/2g (c) (U1 + U2)/2g (d) (U1U2)/2g

Discussion

1669.	Question 3A hammer of mass 500 g, moving at 50 ms−1, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?
Answer» Question 3 A hammer of mass 500 g, moving at $50 m s^{- 1}$ , strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?

Discussion

1670.	• Do you know these people? What instruments do they play?
Answer» • Do you know these people? What instruments do they play?

1670.

• Do you know these people? What instruments do they play?

Answer»

• Do you know these people? What instruments do they play?

Discussion

1671.	Question 62(ii)The graph given below compares the sales of ice-creams of two vendors for a week.Observe the graph and answer the following question.For which day were the sales same for both the vendors?
Answer» Question 62(ii) The graph given below compares the sales of ice-creams of two vendors for a week. Observe the graph and answer the following question. For which day were the sales same for both the vendors?

Discussion

1672.	It is found that as an object is moved from a great distance to the focus of a spherical mirror, the image moves away from the mirror. What kind of mirror is it—convex or concave?
Answer» It is found that as an object is moved from a great distance to the focus of a spherical mirror, the image moves away from the mirror. What kind of mirror is it—convex or concave?

Discussion

1673.	A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car : (a) does not change (b) becomes 4 times that of initial kinetic energy (c) becomes 8 times that of initial kinetic energy (d) becomes 16 times that of initial kinetic energy
Answer» A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car : (a) does not change (b) becomes 4 times that of initial kinetic energy (c) becomes 8 times that of initial kinetic energy (d) becomes 16 times that of initial kinetic energy

1673.

A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car : (a) does not change (b) becomes 4 times that of initial kinetic energy (c) becomes 8 times that of initial kinetic energy (d) becomes 16 times that of initial kinetic energy

Answer»

A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car :

(a) does not change

(b) becomes 4 times that of initial kinetic energy

(c) becomes 8 times that of initial kinetic energy

(d) becomes 16 times that of initial kinetic energy

Discussion

1674.	When a large bubble Rises from the top of a lake to the surface its radius Doubles .1 atmosphere is equal to that of a column of water of height H. the depth of lake is?
Answer» When a large bubble Rises from the top of a lake to the surface its radius Doubles .1 atmosphere is equal to that of a column of water of height H. the depth of lake is?

Discussion

1675.	Explain why is it easier to cut with a sharp knife than a blunt one.
Answer» Explain why is it easier to cut with a sharp knife than a blunt one.

Discussion

1676.	In the video of the chapter, sir said that Potential energy might become Kinetic energy which might become Work.why has he said might and not will? Is there any other possibility?
Answer» In the video of the chapter, sir said that Potential energy might become Kinetic energy which might become Work.why has he said might and not will? Is there any other possibility?

Discussion

1677.	The length of two rods measured by a meter scaleare 60.0 cm and 20.0 cm respectively.The least countof meter scale is 1 mm. Then(First measurement is more accurate(2) Second measurement is more accurate(3) Both measurement are equally accurate(4) First measurement is more precise kindly give an elaborate explanationregarding why 60 cm is more accurate than 20 c
Answer» The length of two rods measured by a meter scaleare 60.0 cm and 20.0 cm respectively.The least countof meter scale is 1 mm. Then(First measurement is more accurate(2) Second measurement is more accurate(3) Both measurement are equally accurate(4) First measurement is more precise kindly give an elaborate explanationregarding why 60 cm is more accurate than 20 c

Discussion

1678.	37. It is raining with a velocity of 5 root 2 m/s at an angle of 45degrees with the vertical. To a man driving with constant velocity v down the inclined plane having an angle theta, rain appears to move vertically downwards with a velocity of 5m/s. Find v and theta.
Answer» 37. It is raining with a velocity of 5 root 2 m/s at an angle of 45degrees with the vertical. To a man driving with constant velocity v down the inclined plane having an angle theta, rain appears to move vertically downwards with a velocity of 5m/s. Find v and theta.

Discussion

1679.	How to calculate n factors like total no of positive and negative ions then no of replacable H atom
Answer» How to calculate n factors like total no of positive and negative ions then no of replacable H atom

Discussion

1680.	Give reasons:(1) Distance and displacement are different concepts.(2) An object at rest can be considered to have uniform motion.(3) When a body falls freely to the ground, its motion has an uniform acceleration.
Answer» Give reasons: (1) Distance and displacement are different concepts. (2) An object at rest can be considered to have uniform motion. (3) When a body falls freely to the ground, its motion has an uniform acceleration.

1680.

Give reasons:(1) Distance and displacement are different concepts.(2) An object at rest can be considered to have uniform motion.(3) When a body falls freely to the ground, its motion has an uniform acceleration.

Answer»

Give reasons:

(1) Distance and displacement are different concepts.

(2) An object at rest can be considered to have uniform motion.

(3) When a body falls freely to the ground, its motion has an uniform acceleration.

Discussion

1681.	The gravitational force of attraction between two bodies of masses 40 kg and 80 kg separated by a distance of 15 m is:(Take Gravitational constant, G=6.673×10−11Nm2kg−2)
Answer» The gravitational force of attraction between two bodies of masses $40 k g$ and $80 k g$ separated by a distance of $15 m$ is: (Take Gravitational constant, $G = 6.673 \times 10^{- 11} N m^{2} k g^{- 2}$ )

Discussion

1682.	Match the following measuring instruments with their typical values of least counts.
Answer» Match the following measuring instruments with their typical values of least counts.

Discussion

1683.	A given piece of wire of length L radius r and resistance R is stretched uniformly to a wire of radius r2. The new resistance is:
Answer» A given piece of wire of length L radius r and resistance R is stretched uniformly to a wire of radius $\frac{r}{2}$ . The new resistance is:

Discussion

1684.	SI unit of heat is
Answer» SI unit of heat is

Discussion

1685.	If the image of a clock seen on a mirror, kept in front of it, is as shown here. What will be the real time in the clock?
Answer» If the image of a clock seen on a mirror, kept in front of it, is as shown here. What will be the real time in the clock?

Discussion

1686.	A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = 3×108 m/s.
Answer» A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = $3 \times 10^{8}$ m/s.

Discussion

1687.	If momentum of a body increases by 50%, its kinetic energy will increase by
Answer» If momentum of a body increases by 50%, its kinetic energy will increase by

Discussion

1688.	The motion of an object moving at uniform acceleration shown in the figure given below can be described with the help of which of the following equations ? \(
Answer» The motion of an object moving at uniform acceleration shown in the figure given below can be described with the help of which of the following equations ? \(

Discussion

1689.	For a small circular current loop magnitude of magnetic field in the plane of the loop at a point distant x from centre of loop (x >> R and magnetic dipole moment of loop is m = IA) is
Answer» For a small circular current loop magnitude of magnetic field in the plane of the loop at a point distant x from centre of loop (x >> R and magnetic dipole moment of loop is m = IA) is

Discussion

1690.	Motion along a circular path with uniform speed is a uniformly accelerated motion or non uniformly accelerated motion? if uniformly accelerated motion then why it is so??
Answer» Motion along a circular path with uniform speed is a uniformly accelerated motion or non uniformly accelerated motion? if uniformly accelerated motion then why it is so??

Discussion

1691.	A ball is thrown upwards with a velocity of 10 ms−1. Find the maximum height reached by the ball.
Answer» A ball is thrown upwards with a velocity of $10 m s^{- 1}$ . Find the maximum height reached by the ball.

Discussion

1692.	An object has velocity v=(2i^+4j^)m/s at time t=0s.If undergoes a constant acceleration a=(i^-3j^)m/s2 for t=4s thenFind the Co ordinates of the object at t =0seconds(Why while putting value we put here t=4 not 0)
Answer» An object has velocity v=(2i^+4j^)m/s at time t=0s.If undergoes a constant acceleration a=(i^-3j^) m/s2 for t=4s then Find the Co ordinates of the object at t =0seconds (Why while putting value we put here t=4 not 0)

Discussion

1693.	Explain the laws of kepler.
Answer» Explain the laws of kepler.

Discussion

1694.	Which of the following graphs correctly represents the variation of →E vs r for two point charges +q and −2q kept some distance apart along the line joining these two charges?
Answer» Which of the following graphs correctly represents the variation of $\to E$ vs $r$ for two point charges $+ q$ and $- 2 q$ kept some distance apart along the line joining these two charges?

Discussion

1695.	Explain how artificial satellites help in transmission of television programmes over large areas.
Answer» Explain how artificial satellites help in transmission of television programmes over large areas.

Discussion

1696.	Points at which resultant magnetic field is zero are called ___.
Answer» Points at which resultant magnetic field is zero are called ___.

Discussion

1697.	Degrees of freedom of a diatomic gas is (neglect vibrational modes)
Answer» Degrees of freedom of a diatomic gas is $($ neglect vibrational modes $)$

Discussion

1698.	the ratio of displacement in n seconds to nth second for a particle starting from rest and uniform acceleratio
Answer» the ratio of displacement in n seconds to nth second for a particle starting from rest and uniform acceleratio

Discussion

1699.	How can we distinguish plants from rest of the organisms?
Answer» How can we distinguish plants from rest of the organisms?

Discussion

1700.	Define a battery. What is the symbol of cell and battery?
Answer» Define a battery. What is the symbol of cell and battery?

Discussion

Explore topic-wise InterviewSolutions in .

A truck moves at 36 kmh−1. It increases its velocity to 90 kmh−1 in 0.1 minute.What is the acceleration of the truck?

Give an example where object is at rest and also in motion at the same time

74. A body dropped from the top of a tower covers a distance 7x in the last second of its journey where x is the distance covered in first second how much time does it take to reach the ground ?

During the night, an area of low pressure is formed on which of the following?

Question 27Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

The dis†an ce travelled by a body in the nth second is given by where u is initial velocity and a is acceleration. The dimensions of are

Sir/Mam A gun weighing 10 kg fires a bullet of 30 g with a velocity of 330 m/s . With what velocity does the gun recoil ? Pls help me solve this question Thnx

A string 2.0 m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is -

4.A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased ,then the force developed in it is proportional to

A ball of mass 1 kg is projected from the top of an incline with speed 5ms. It hits the incline at point A which is 3m down the slope and rebounds and hits again at the foot of the incline.Find the total work done by the gravity on the ball in the entire process.

A 120m long train is moving towards west at a speed of 10m/s. A small bird flying towards east with a speed of 5m/s crosses the train. Find the time taken by the bird to cross the train in second???

if acceleration due to gravity at dis†an ce d(

3. Two organ pipes closed at one end are of equal diameter but different length . They produce 8 beat per sec when sounded simultaneously. The smaller organ pipe is 16 cm long and the speed of sound in air is 320m/sec . Find the length of other pipe.

Why weak nuclear force is lower than electro magnetic force

115.From the top of a tower two balls are thrown horizontally with velocities U1 and U2 in opposite directions simultaneously. If the velocities are perpendicular to each other just before they strike the ground the height of Tower is (a) (U1 + U2)/2g (b) (U1 - U2)/2g (c) (U1 + U2)/2g (d) (U1U2)/2g

Question 3A hammer of mass 500 g, moving at 50 ms−1, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?

• Do you know these people? What instruments do they play?

Question 62(ii)The graph given below compares the sales of ice-creams of two vendors for a week.Observe the graph and answer the following question.For which day were the sales same for both the vendors?

It is found that as an object is moved from a great distance to the focus of a spherical mirror, the image moves away from the mirror. What kind of mirror is it—convex or concave?

When a large bubble Rises from the top of a lake to the surface its radius Doubles .1 atmosphere is equal to that of a column of water of height H. the depth of lake is?

Explain why is it easier to cut with a sharp knife than a blunt one.

In the video of the chapter, sir said that Potential energy might become Kinetic energy which might become Work.why has he said might and not will? Is there any other possibility?

37. It is raining with a velocity of 5 root 2 m/s at an angle of 45degrees with the vertical. To a man driving with constant velocity v down the inclined plane having an angle theta, rain appears to move vertically downwards with a velocity of 5m/s. Find v and theta.

How to calculate n factors like total no of positive and negative ions then no of replacable H atom

Give reasons:(1) Distance and displacement are different concepts.(2) An object at rest can be considered to have uniform motion.(3) When a body falls freely to the ground, its motion has an uniform acceleration.

The gravitational force of attraction between two bodies of masses 40 kg and 80 kg separated by a distance of 15 m is:(Take Gravitational constant, G=6.673×10−11Nm2kg−2)

Match the following measuring instruments with their typical values of least counts.

A given piece of wire of length L radius r and resistance R is stretched uniformly to a wire of radius r2. The new resistance is:

SI unit of heat is

If the image of a clock seen on a mirror, kept in front of it, is as shown here. What will be the real time in the clock?

A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = 3×108 m/s.

If momentum of a body increases by 50%, its kinetic energy will increase by

The motion of an object moving at uniform acceleration shown in the figure given below can be described with the help of which of the following equations ? \(

For a small circular current loop magnitude of magnetic field in the plane of the loop at a point distant x from centre of loop (x >> R and magnetic dipole moment of loop is m = IA) is

Motion along a circular path with uniform speed is a uniformly accelerated motion or non uniformly accelerated motion? if uniformly accelerated motion then why it is so??

A ball is thrown upwards with a velocity of 10 ms−1. Find the maximum height reached by the ball.

An object has velocity v=(2i^+4j^)m/s at time t=0s.If undergoes a constant acceleration a=(i^-3j^)m/s2 for t=4s thenFind the Co ordinates of the object at t =0seconds(Why while putting value we put here t=4 not 0)

Explain the laws of kepler.

Which of the following graphs correctly represents the variation of →E vs r for two point charges +q and −2q kept some distance apart along the line joining these two charges?

Explain how artificial satellites help in transmission of television programmes over large areas.

Points at which resultant magnetic field is zero are called ___.

Degrees of freedom of a diatomic gas is (neglect vibrational modes)

the ratio of displacement in n seconds to nth second for a particle starting from rest and uniform acceleratio

How can we distinguish plants from rest of the organisms?

Define a battery. What is the symbol of cell and battery?