2673 + Interview Questions in Physics Page 54 InterviewSolution

2651.	A car accelerates from rest at a constant rate α for some time after which it decelerates at a constant rate β to come to rest. If the total time elapsed is t, the total distance travelled by the car is given by
Answer» A car accelerates from rest at a constant rate $α$ for some time after which it decelerates at a constant rate $β$ to come to rest. If the total time elapsed is t, the total distance travelled by the car is given by

Discussion

2652.	Differentiation of sinx2 w.r.t. x is
Answer» Differentiation of $sin x^{2}$ w.r.t. $x$ is

Discussion

2653.	Assuming gravitational potential energy ′U′ at ground level to be zero.All objects are made up of same material.UP= gravitational potential energy of solid sphereUQ= gravitational potential energy of solid cubeUR= gravitational potential energy of solid coneUS= gravitational potential energy of solid cylinder
Answer» Assuming gravitational potential energy $^{'} U^{'}$ at ground level to be zero. All objects are made up of same material. $U_{P} =$ gravitational potential energy of solid sphere $U_{Q} =$ gravitational potential energy of solid cube $U_{R} =$ gravitational potential energy of solid cone $U_{S} =$ gravitational potential energy of solid cylinder

Discussion

2654.	A particle starts from rest and has an acceleration of 2 m/s2 for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of 4 m/s2 and comes back to rest. The total distance covered by the particle is
Answer» A particle starts from rest and has an acceleration of $2 {m/s}^{2}$ for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of $4 {m/s}^{2}$ and comes back to rest. The total distance covered by the particle is

Discussion

2655.	Convert π3 radians to degrees.
Answer» Convert $\frac{π}{3}$ radians to degrees.

Discussion

2656.	Block A of mass m and block B of mass 2m are placed on a fixed tringular wedge by means of a massless inextensible string and a frictionless pulley as shown in figure . The wedge is inclined at 45∘ to the horizointal on both sides. If the coefficient of friction between the block A and the wedge is 23 and that between block B and the wedge is 13 and both the blocks A and B are released from rest, the acceleration of A will be
Answer» Block A of mass $m$ and block $B$ of mass $2 m$ are placed on a fixed tringular wedge by means of a massless inextensible string and a frictionless pulley as shown in figure . The wedge is inclined at $45^{\circ}$ to the horizointal on both sides. If the coefficient of friction between the block $A$ and the wedge is $\frac{2}{3}$ and that between block B and the wedge is $\frac{1}{3}$ and both the blocks $A$ and $B$ are released from rest, the acceleration of $A$ will be

Discussion

2657.	The position of a particle moving along the x-axis varies with time t as x=4t−t2+1. Find the time interval(s) during which the particle is moving along positive x- direction.
Answer» The position of a particle moving along the $x$ -axis varies with time $t$ as $x = 4 t - t^{2} + 1$ . Find the time interval(s) during which the particle is moving along positive $x$ - direction.

Discussion

2658.	I have a battery of internal resistance 20mΩ. When discharging with a current of 1A, the potential difference across its terminals is 2V. What is its EMF?
Answer» I have a battery of internal resistance $20 m Ω$ . When discharging with a current of 1A, the potential difference across its terminals is 2V. What is its EMF?

Discussion

2659.	Two bodies of masses M1 and M2 are initially at rest at infinite distance apart. They are then allowed to move towards each other under mutual gravitational attraction. Their relative velocity of approach at a separation distance r between them is
Answer» Two bodies of masses $M_{1}$ and $M_{2}$ are initially at rest at infinite distance apart. They are then allowed to move towards each other under mutual gravitational attraction. Their relative velocity of approach at a separation distance r between them is

Discussion

2660.	The distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero is...( The mass of the earth is 6.0× 1024 kg and that of the moon is 7.4× 1022 kg. The distance between the earth and the moon is 40 × 105 km.
Answer» The distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero is...( The mass of the earth is 6.0 $\times$ $10^{24}$ kg and that of the moon is 7.4 $\times$ $10^{22}$ kg. The distance between the earth and the moon is 40 $\times$ $10^{5}$ km.

Discussion

2661.	Graph shows the x(t) curves for three experiments involving a particular spring-block system oscillating in SHM. The kinetic energy of the system is maximum at t=4 sec, for the situation:
Answer» Graph shows the x(t) curves for three experiments involving a particular spring-block system oscillating in SHM. The kinetic energy of the system is maximum at t=4 sec, for the situation:

2661.

Graph shows the x(t) curves for three experiments involving a particular spring-block system oscillating in SHM. The kinetic energy of the system is maximum at t=4 sec, for the situation:

Answer»

Graph shows the x(t) curves for three experiments involving a particular spring-block system oscillating in SHM. The kinetic energy of the system is maximum at t=4 sec, for the situation:

Discussion

2662.	The voltage time (V-t) graph for triangular wave having peak value V0 is as shown in fig.The rms value of V in time interval from t=0 to T/4 is
Answer» The voltage time (V-t) graph for triangular wave having peak value V₀ is as shown in fig.The rms value of V in time interval from t=0 to T/4 is

2662.

The voltage time (V-t) graph for triangular wave having peak value V0 is as shown in fig.The rms value of V in time interval from t=0 to T/4 is

Answer»

The voltage time (V-t) graph for triangular wave having peak value V₀ is as shown in fig.The rms value of V in time interval from t=0 to T/4 is

Discussion

2663.	A thin uniform circular ring is rolling down an inclined plane of inclination 30∘ without slipping. Its linear acceleration along the inclined plane will be
Answer» A thin uniform circular ring is rolling down an inclined plane of inclination $30^{\circ}$ without slipping. Its linear acceleration along the inclined plane will be

Discussion

2664.	A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains the same, the stress in the leg will change by a factor of:91981181
Answer» A man grows into a giant such that his linear dimensions increase by a factor of $9$ . Assuming that his density remains the same, the stress in the leg will change by a factor of: $9$ $\frac{1}{9}$ $81$ $\frac{1}{81}$

2664.

A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains the same, the stress in the leg will change by a factor of:91981181

Answer»

A man grows into a giant such that his linear dimensions increase by a factor of $9$ . Assuming that his density remains the same, the stress in the leg will change by a factor of:

$9$
$\frac{1}{9}$
$81$
$\frac{1}{81}$

Discussion

2665.	A particular guitar wire is 30.0 cm long and vibrates at a frequency of 196 Hz when no finger is placed on it. The next higher notes on the scale are 220 Hz, 247 Hz, 262 Hz and 294 Hz. How far from the end of the string must the finger be placed to play these notes?
Answer» A particular guitar wire is 30.0 cm long and vibrates at a frequency of 196 Hz when no finger is placed on it. The next higher notes on the scale are 220 Hz, 247 Hz, 262 Hz and 294 Hz. How far from the end of the string must the finger be placed to play these notes?

Discussion

2666.	Statement I : Rays incident on a convex mirror from a point source of light, after reflection diverge. Statement II : A convex mirror can never form a real image for a point source of light.
Answer» Statement I : Rays incident on a convex mirror from a point source of light, after reflection diverge. Statement II : A convex mirror can never form a real image for a point source of light.

Discussion

2667.	To keep the current flowing in a conductor continuously we need to maintain a constant ___ difference across its terminal.
Answer» To keep the current flowing in a conductor continuously we need to maintain a constant ___ difference across its terminal.

Discussion

2668.	A wheel is rotating at the rate of 20 rev min−1 in clockwise direction. What should be the magnitude of the angular acceleration of the wheel so that it stops rotating in 10 s?
Answer» A wheel is rotating at the rate of $20 {rev min}^{- 1}$ in clockwise direction. What should be the magnitude of the angular acceleration of the wheel so that it stops rotating in $10 s$ ?

Discussion

2669.	When a capillary tube is placed in mercury, we see that__
Answer» When a capillary tube is placed in mercury, we see that__

Discussion

2670.	A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is
Answer» A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

Discussion

2671.	A body of mass 1 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision with a velocity equal to 14 of its original velocity. The mass of the second body is
Answer» A body of mass 1 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision with a velocity equal to $\frac{1}{4}$ of its original velocity. The mass of the second body is

Discussion

2672.	A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of
Answer» A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of

Discussion

2673.	A particle accelerates from rest at a constant rate for some time and attains a peak velocity of 8 m s−1. Afterwards, it decelerates at the same rate and comes to rest. If the total time taken is 4 seconds, the total distance travelled is _____.
Answer» A particle accelerates from rest at a constant rate for some time and attains a peak velocity of $8 m s^{- 1}$ . Afterwards, it decelerates at the same rate and comes to rest. If the total time taken is 4 seconds, the total distance travelled is _____.

Discussion

Explore topic-wise InterviewSolutions in .

A car accelerates from rest at a constant rate α for some time after which it decelerates at a constant rate β to come to rest. If the total time elapsed is t, the total distance travelled by the car is given by

Differentiation of sinx2 w.r.t. x is

A particle starts from rest and has an acceleration of 2 m/s2 for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of 4 m/s2 and comes back to rest. The total distance covered by the particle is

Convert π3 radians to degrees.

The position of a particle moving along the x-axis varies with time t as x=4t−t2+1. Find the time interval(s) during which the particle is moving along positive x- direction.

I have a battery of internal resistance 20mΩ. When discharging with a current of 1A, the potential difference across its terminals is 2V. What is its EMF?

Two bodies of masses M1 and M2 are initially at rest at infinite distance apart. They are then allowed to move towards each other under mutual gravitational attraction. Their relative velocity of approach at a separation distance r between them is

The distance of a point from the earth's centre where the resultant gravitational field due to the earth and the moon is zero is...( The mass of the earth is 6.0× 1024 kg and that of the moon is 7.4× 1022 kg. The distance between the earth and the moon is 40 × 105 km.

Graph shows the x(t) curves for three experiments involving a particular spring-block system oscillating in SHM. The kinetic energy of the system is maximum at t=4 sec, for the situation:

The voltage time (V-t) graph for triangular wave having peak value V0 is as shown in fig.The rms value of V in time interval from t=0 to T/4 is

A thin uniform circular ring is rolling down an inclined plane of inclination 30∘ without slipping. Its linear acceleration along the inclined plane will be

A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains the same, the stress in the leg will change by a factor of:91981181

A particular guitar wire is 30.0 cm long and vibrates at a frequency of 196 Hz when no finger is placed on it. The next higher notes on the scale are 220 Hz, 247 Hz, 262 Hz and 294 Hz. How far from the end of the string must the finger be placed to play these notes?

Statement I : Rays incident on a convex mirror from a point source of light, after reflection diverge. Statement II : A convex mirror can never form a real image for a point source of light.

To keep the current flowing in a conductor continuously we need to maintain a constant ___ difference across its terminal.

A wheel is rotating at the rate of 20 rev min−1 in clockwise direction. What should be the magnitude of the angular acceleration of the wheel so that it stops rotating in 10 s?

When a capillary tube is placed in mercury, we see that__

A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

A body of mass 1 kg makes an elastic collision with another body at rest and continues to move in the original direction after collision with a velocity equal to 14 of its original velocity. The mass of the second body is

A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of

A particle accelerates from rest at a constant rate for some time and attains a peak velocity of 8 m s−1. Afterwards, it decelerates at the same rate and comes to rest. If the total time taken is 4 seconds, the total distance travelled is _____.