50278 + Interview Questions in Physics

1.	On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that
Answer» On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

Discussion

2.	Why is it difficult to experimentally detect neutrinos in nuclear β-decay ?
Answer» Why is it difficult to experimentally detect neutrinos in nuclear $β$ -decay ?

Discussion

3.	A satellite can be in a geostationary orbit around earth at a distance r from the center. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth, if its distance from the center is
Answer» A satellite can be in a geostationary orbit around earth at a distance $r$ from the center. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth, if its distance from the center is

Discussion

4.	Which of the following molecules has one lone pair of electron :
Answer» Which of the following molecules has one lone pair of electron :

Discussion

5.	Mn and Mp represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be
Answer» $M_{n}$ and $M_{p}$ represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

Discussion

6.	A capacitor having C=10μF; Potential across plates, V = 10V; Distance between plates 10mm; And area of plates 10cm2, has air between the plates. What is the force on one of the plates.
Answer» A capacitor having $C = 10 μ F$ ; Potential across plates, V = 10V; Distance between plates 10mm; And area of plates $10 c m^{2}$ , has air between the plates. What is the force on one of the plates.

Discussion

7.	A particle of mass 50 g moves on a straight line. The variation of speed with time is shown in figure. Find the force acting on the particles at t = 2, 4 and 6 seconds.
Answer» A particle of mass 50 g moves on a straight line. The variation of speed with time is shown in figure. Find the force acting on the particles at t = 2, 4 and 6 seconds.

Discussion

8.	A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant?
Answer» A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant?

Discussion

9.	Charge is continuously fed to a conductor. What should the minimum charge density at any point be to give corona discharge when the conductor is kept in air? (Dielectric strength of air is 3,000,000Vm
Answer» Charge is continuously fed to a conductor. What should the minimum charge density at any point be to give corona discharge when the conductor is kept in air? (Dielectric strength of air is $3, 000, 000 \frac{V}{m}$

Discussion

10.	At a particular point in the Pacific ocean, the density of sea water increase non – linearly with depth according to ρ=ρ0+mz2, where ρ0 is the density at the surface, z is the depth below the surface and m is a constant. The algebraic equation for the relationship between pressure and depth is
Answer» At a particular point in the Pacific ocean, the density of sea water increase non – linearly with depth according to $ρ = ρ_{0} + m z^{2}$ , where $ρ_{0}$ is the density at the surface, $z$ is the depth below the surface and $m$ is a constant. The algebraic equation for the relationship between pressure and depth is

Discussion

11.	A hollow sphere of mass m = 1 kg and radius R = 1m rests on a smooth horizontal surface. A simple pendulum having string of length R and bob of mass m = 1 kg hangs from top most point of the sphere as shown in the figure. A bullet of mass m = 1 kg and velocity v = 2m/sec partially penetrates the left side of the sphere. The velocity of the sphere just after collision with bullet is:
Answer» A hollow sphere of mass $m$ = 1 kg and radius $R$ = 1m rests on a smooth horizontal surface. A simple pendulum having string of length $R$ and bob of mass $m$ = 1 kg hangs from top most point of the sphere as shown in the figure. A bullet of mass $m$ = 1 kg and velocity $v$ = 2m/sec partially penetrates the left side of the sphere. The velocity of the sphere just after collision with bullet is:

11.

A hollow sphere of mass m = 1 kg and radius R = 1m rests on a smooth horizontal surface. A simple pendulum having string of length R and bob of mass m = 1 kg hangs from top most point of the sphere as shown in the figure. A bullet of mass m = 1 kg and velocity v = 2m/sec partially penetrates the left side of the sphere. The velocity of the sphere just after collision with bullet is:

Answer»

A hollow sphere of mass $m$ = 1 kg and radius $R$ = 1m rests on a smooth horizontal surface. A simple pendulum having string of length $R$ and bob of mass $m$ = 1 kg hangs from top most point of the sphere as shown in the figure. A bullet of mass $m$ = 1 kg and velocity $v$ = 2m/sec partially penetrates the left side of the sphere. The velocity of the sphere just after collision with bullet is:

Discussion

12.	The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
Answer» The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be

Discussion

13.	A 5.0 μF capacitor is charged to 12 V. The positive plate of this capacitor is now connected to the negative terminal is now connected to the negative terminal of a 12 V batter and vice versa. Calculate the heat developed in the connecting wires.
Answer» $A 5.0 μ F$ capacitor is charged to 12 V. The positive plate of this capacitor is now connected to the negative terminal is now connected to the negative terminal of a 12 V batter and vice versa. Calculate the heat developed in the connecting wires.

Discussion

14.	A gun is mounted on a railroad car.The mass of the car,the gun,the shells and the operator is 50 m where m is the mass of one shell.If the velocity of the shell with respect to the gun (in its state before firing) is 200 ms,what is the recoil speed of the car after the second shot ? Neglect friction.
Answer» A gun is mounted on a railroad car.The mass of the car,the gun,the shells and the operator is 50 m where m is the mass of one shell.If the velocity of the shell with respect to the gun (in its state before firing) is 200 $\frac{m}{s}$ ,what is the recoil speed of the car after the second shot ? Neglect friction.

Discussion

15.	Velocity of sound in air is 332ms−1. Its velocity in vacuum will be
Answer» Velocity of sound in air is $332 m s^{- 1}$ . Its velocity in vacuum will be

Discussion

16.	Water flows through a horizontal tube as shown in figure. If the difference in heights of the water columns in the vertical tubes is 4 cm, and the cross-sectional area A1 and A2 are 6 cm2 and 3 cm2 respectively, find the rate of flow of water across any section.
Answer» Water flows through a horizontal tube as shown in figure. If the difference in heights of the water columns in the vertical tubes is $4 cm$ , and the cross-sectional area $A_{1}$ and $A_{2}$ are $6 {cm}^{2}$ and $3 {cm}^{2}$ respectively, find the rate of flow of water across any section.

Discussion

17.	Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').
Answer» Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').

Discussion

18.	The energy gap of pure Si is 1.1 eV. The mobilities of electrons and holes are respectively 0.135 m2V−1s−1 and 0.048 m2V−1s−1 and can be taken as independent of temperature. The intrinsic carrier concentration is given by ni=n0e−E02kT where n0 is a constant, Eg the gap width and k the Boltzmann's constant whose value is 1.36×10−23 JK−1. Find the ratio of the electrical conductivities of Si at 600 K and 300 K in the form of n×104. And report the value of n, where n is an integer -
Answer» The energy gap of pure Si is 1.1 eV. The mobilities of electrons and holes are respectively $0.135 m^{2} V^{- 1} s^{- 1}$ and $0.048 m^{2} V^{- 1} s^{- 1}$ and can be taken as independent of temperature. The intrinsic carrier concentration is given by $n_{i} = n_{0} e^{- \frac{E_{0}}{2 k T}}$ where $n_{0}$ is a constant, $E_{g}$ the gap width and k the Boltzmann's constant whose value is $1.36 \times 10^{- 23} J K^{- 1}$ . Find the ratio of the electrical conductivities of Si at 600 K and 300 K in the form of $n \times 10^{4}$ . And report the value of n, where n is an integer -

Discussion

19.	A mixture of gases O2,H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :
Answer» A mixture of gases $O_{2}, H_{2}$ and $C O$ are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :

Discussion

20.	The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are
Answer» The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

20.

The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

Answer»

The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

Discussion

21.	An infinitesimally small bar magnet of dipole moment Pm is pointing and moving with the speed v in the x–direction. A small closed circular conducting loop of radius a and negligible self–inductance lies in the y–z plane with its centre at x = 0, and its axis coinciding with the x–axis. The resistance of the loop is R. Assume that the distance x of the magnet from the centre of the loop is much greater than a. The force opposing the motion is ∝1xy. Value of y is ___
Answer» An infinitesimally small bar magnet of dipole moment $P_{m}$ is pointing and moving with the speed v in the x–direction. A small closed circular conducting loop of radius a and negligible self–inductance lies in the y–z plane with its centre at x = 0, and its axis coinciding with the x–axis. The resistance of the loop is R. Assume that the distance x of the magnet from the centre of the loop is much greater than a. The force opposing the motion is $\propto \frac{1}{x^{y}}$ . Value of y is ___

21.

An infinitesimally small bar magnet of dipole moment Pm is pointing and moving with the speed v in the x–direction. A small closed circular conducting loop of radius a and negligible self–inductance lies in the y–z plane with its centre at x = 0, and its axis coinciding with the x–axis. The resistance of the loop is R. Assume that the distance x of the magnet from the centre of the loop is much greater than a. The force opposing the motion is ∝1xy. Value of y is ___

Answer»

An infinitesimally small bar magnet of dipole moment $P_{m}$ is pointing and moving with the speed v in the x–direction. A small closed circular conducting loop of radius a and negligible self–inductance lies in the y–z plane with its centre at x = 0, and its axis coinciding with the x–axis. The resistance of the loop is R. Assume that the distance x of the magnet from the centre of the loop is much greater than a. The force opposing the motion is $\propto \frac{1}{x^{y}}$ . Value of y is

___

Discussion

22.	Figure shows the acceleration – time (a–t) graph of a body moving in a straight line. Which graph in figure shows the velocity – time (v−t) graph of the motion of the body? (Assume that x=0 and v=0 at t=0)
Answer» Figure shows the acceleration – time ( $a - t$ ) graph of a body moving in a straight line. Which graph in figure shows the velocity – time ( $v - t$ ) graph of the motion of the body? (Assume that $x = 0$ and $v = 0$ at $t = 0$ )

22.

Figure shows the acceleration – time (a–t) graph of a body moving in a straight line. Which graph in figure shows the velocity – time (v−t) graph of the motion of the body? (Assume that x=0 and v=0 at t=0)

Answer»

Figure shows the acceleration – time ( $a - t$ ) graph of a body moving in a straight line. Which graph in figure shows the velocity – time ( $v - t$ ) graph of the motion of the body? (Assume that $x = 0$ and $v = 0$ at $t = 0$ )

Discussion

23.	The output (X) of the logic circuit shown in figure will be
Answer» The output (X) of the logic circuit shown in figure will be

Discussion

24.	A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of (Neglect air friction and take g=10 m/s2)
Answer» A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of (Neglect air friction and take $g = 10 m / s^{2}$ )

Discussion

25.	A boat which has a speed of 5 km/hr in still water, crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is
Answer» A boat which has a speed of $5 k m / h r$ in still water, crosses a river of width $1 k m$ along the shortest possible path in $15$ minutes. The velocity of the river water is

Discussion

26.	A wire of length 2 m is suspended from the top of a roof at one end and a load of W is attached at the other end. Cross-sectional area of the wire is 5×10−7 m2 and elongation (Δl) is shown in the graph. Find the Young's modulus of elasticity of the wire material.
Answer» A wire of length $2 m$ is suspended from the top of a roof at one end and a load of $W$ is attached at the other end. Cross-sectional area of the wire is $5 \times 10^{- 7} m^{2}$ and elongation $(Δ l)$ is shown in the graph. Find the Young's modulus of elasticity of the wire material.

Discussion

27.	A 2 g bullet moving with a velocity of 210 m/s brought to a sudden stoppage by an obstacle. The total heat produced goes to the bullet. If the specific heat of the bullet is 0.03 cal/g∘C the rise in its temperature will be
Answer» A $2 g$ bullet moving with a velocity of $210 m/s$ brought to a sudden stoppage by an obstacle. The total heat produced goes to the bullet. If the specific heat of the bullet is $0.03 {cal/g}^{\circ} C$ the rise in its temperature will be

Discussion

28.	Centre of mass is a special point on the body where we can forget the velocities of all other points on the body and consider only its velocity as the velocity for the body. So for a body undergoing rotational motion we can find the velocity of its centre of mass and forget all other velocities and treat it just like a translatory motion i.e, circular motion?
Answer» Centre of mass is a special point on the body where we can forget the velocities of all other points on the body and consider only its velocity as the velocity for the body. So for a body undergoing rotational motion we can find the velocity of its centre of mass and forget all other velocities and treat it just like a translatory motion i.e, circular motion?

Discussion

29.	A piston is fitted in a cylindrical tube of small cross section with the other end of the tube open. The tube resonates with a tuning fork of frequency 512 Hz. The piston is gradually pulled out of the tube and it is found that a second resonance occurs when the piston is pulled out through a distance of 32.0 cm. Calculate the speed of sound in the medium of the tube.
Answer» A piston is fitted in a cylindrical tube of small cross section with the other end of the tube open. The tube resonates with a tuning fork of frequency 512 Hz. The piston is gradually pulled out of the tube and it is found that a second resonance occurs when the piston is pulled out through a distance of 32.0 cm. Calculate the speed of sound in the medium of the tube.

Discussion

30.	A body falls freely for 10 sec. It's avg velocity during this journey is? ( g= 10 m per s square)
Answer» A body falls freely for 10 sec. It's avg velocity during this journey is? ( g= 10 m per s square)

Discussion

31.	In figure (a square), identify the following vectors: (i) Collinear but not equal.
Answer» In figure (a square), identify the following vectors: (i) Collinear but not equal.

Discussion

32.	A tank is filled upto a height H. The horizontal range of water coming out of the hole which is at depth H4 from the surface level of water is
Answer» A tank is filled upto a height $H$ . The horizontal range of water coming out of the hole which is at depth $\frac{H}{4}$ from the surface level of water is

Discussion

33.	A ball moves over a fixed track as shown in figure. From A to B, the ball rolls without slipping. Surface BC is frictionless. KA,KB and KC are kinetic energies of the ball at A, B and C respectively. Then choose the correct alternative below- (a) hA>hC; KB>KC (b) hA>hC; KC>KA(c) hA=hC; KB=KC (d) hA<hC; KB>KC
Answer» A ball moves over a fixed track as shown in figure. From $A$ to $B$ , the ball rolls without slipping. Surface $B C$ is frictionless. $K_{A}, K_{B}$ and $K_{C}$ are kinetic energies of the ball at $A$ , $B$ and $C$ respectively. Then choose the correct alternative below- $(a) h_{A} > h_{C}; K_{B} > K_{C} (b) h_{A} > h_{C}; K_{C} > K_{A} (c) h_{A} = h_{C}; K_{B} = K_{C} (d) h_{A} < h_{C}; K_{B} > K_{C}$

Discussion

34.	A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.
Answer» A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

Discussion

35.	Three capacitors having capacitances 20 μF, 30 μF and 40 μF are connected in series with a 12 V battery. Find the charge on each of the capacitors. How much work has been done by the battery in charging the capacitors ?
Answer» Three capacitors having capacitances $20 μ F, 30 μ F$ and $40 μ F$ are connected in series with a 12 V battery. Find the charge on each of the capacitors. How much work has been done by the battery in charging the capacitors ?

Discussion

36.	Two trains are each 50 m long moving parallel towards each other at speeds 10 m/s and 15 m/s respectively. After what time will they pass each other?
Answer» Two trains are each $50 m$ long moving parallel towards each other at speeds $10 m/s$ and $15 m/s$ respectively. After what time will they pass each other?

Discussion

37.	Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to
Answer» Gas at a pressure $P_{0}$ , in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

37.

Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Answer»

Gas at a pressure $P_{0}$ , in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Discussion

38.	What is the maximum number of emission lines obtained when the exited electron of a H atom in n=6 drop to the ground state ?
Answer» What is the maximum number of emission lines obtained when the exited electron of a H atom in n=6 drop to the ground state ?

Discussion

39.	A simple pendulum is oscillating without damping.When the displacement of the bob is less than maximum, its acceleration vector →a is correctly shown in
Answer» A simple pendulum is oscillating without damping.When the displacement of the bob is less than maximum, its acceleration vector $\to a$ is correctly shown in

Discussion

40.	Two balls at same temperature collide. What is conserved?
Answer» Two balls at same temperature collide. What is conserved?

40.

Two balls at same temperature collide. What is conserved?

Answer»

Two balls at same temperature collide. What is conserved?

Discussion

41.	Uniform velocity and constant velocity the same or not
Answer» Uniform velocity and constant velocity the same or not

Discussion

42.	Six particles each of mass 5 kg are placed along the circumference of a circle of radius 3 m. What is the moment of inertia of the system about an axis passing through the centre of the circle and perpendicular to the plane of the circle?
Answer» Six particles each of mass $5 kg$ are placed along the circumference of a circle of radius $3 m$ . What is the moment of inertia of the system about an axis passing through the centre of the circle and perpendicular to the plane of the circle?

Discussion

43.	The elecrostatic potential at a point (x,y,z) is given by V= x2y + 2z. Calculate the electrostatic field at the point (2,1,1)
Answer» The elecrostatic potential at a point (x,y,z) is given by V= x²y + 2z. Calculate the electrostatic field at the point (2,1,1)

Discussion

44.	A monkey of mass 40 kg climbs up a rope of breaking load 600 N, hanging from a ceiling. If it climbs up the rope with maximum possible acceleration, then the time taken by the monkey to climb up is: (Length of the rope is 10 m and g=10 m/s2).
Answer» A monkey of mass $40 kg$ climbs up a rope of breaking load $600 N$ , hanging from a ceiling. If it climbs up the rope with maximum possible acceleration, then the time taken by the monkey to climb up is: (Length of the rope is $10 m$ and $g = 10 {m/s}^{2}$ ).

Discussion

45.	If an object is thrown horizontally with an initial speed 10 M per second from the top of the building of height hundred metre. what is horizontal distance covered by the particle?
Answer» If an object is thrown horizontally with an initial speed 10 M per second from the top of the building of height hundred metre. what is horizontal distance covered by the particle?

Discussion

46.	Given C=400+0.9Y and I=4,000, find: (i) Y at equilibrium (ii) S and C at equilibrium
Answer» Given $C = 400 + 0.9 Y$ and $I = 4, 000$ , find: (i) Y at equilibrium (ii) S and C at equilibrium

46.

Given C=400+0.9Y and I=4,000, find: (i) Y at equilibrium (ii) S and C at equilibrium

Answer»

Given $C = 400 + 0.9 Y$ and $I = 4, 000$ , find:

(i) Y at equilibrium

(ii) S and C at equilibrium

Discussion

47.	A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The outward flux over the surface of the cylinder is given by
Answer» A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The outward flux over the surface of the cylinder is given by

Discussion

48.	When 100J of work is done on a fly wheel, it's angular velocity is increased from 60rpm to 180rpm. What is theomens of inertia
Answer» When 100J of work is done on a fly wheel, it's angular velocity is increased from 60rpm to 180rpm. What is theomens of inertia

Discussion

49.	A body cools down from 500C to 450C in 5 minutes and to 400C in another 8 minutes. Find the temperature of the surrounding.
Answer» A body cools down from $50^{0}$ C to $45^{0}$ C in 5 minutes and to $40^{0}$ C in another 8 minutes. Find the temperature of the surrounding.

Discussion

50.	A bullet of mass 20 g enters into a fixed wooden block with a speed of 40 ms−1 and stops in it. Find the change in internal energy during the process.
Answer» A bullet of mass 20 g enters into a fixed wooden block with a speed of 40 $m s^{- 1}$ and stops in it. Find the change in internal energy during the process.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

Why is it difficult to experimentally detect neutrinos in nuclear β-decay ?

A satellite can be in a geostationary orbit around earth at a distance r from the center. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth, if its distance from the center is

Which of the following molecules has one lone pair of electron :

Mn and Mp represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

A capacitor having C=10μF; Potential across plates, V = 10V; Distance between plates 10mm; And area of plates 10cm2, has air between the plates. What is the force on one of the plates.

A particle of mass 50 g moves on a straight line. The variation of speed with time is shown in figure. Find the force acting on the particles at t = 2, 4 and 6 seconds.

A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant?

Charge is continuously fed to a conductor. What should the minimum charge density at any point be to give corona discharge when the conductor is kept in air? (Dielectric strength of air is 3,000,000Vm

At a particular point in the Pacific ocean, the density of sea water increase non – linearly with depth according to ρ=ρ0+mz2, where ρ0 is the density at the surface, z is the depth below the surface and m is a constant. The algebraic equation for the relationship between pressure and depth is

The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be

A 5.0 μF capacitor is charged to 12 V. The positive plate of this capacitor is now connected to the negative terminal is now connected to the negative terminal of a 12 V batter and vice versa. Calculate the heat developed in the connecting wires.

Velocity of sound in air is 332ms−1. Its velocity in vacuum will be

Water flows through a horizontal tube as shown in figure. If the difference in heights of the water columns in the vertical tubes is 4 cm, and the cross-sectional area A1 and A2 are 6 cm2 and 3 cm2 respectively, find the rate of flow of water across any section.

Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').

A mixture of gases O2,H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :

The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

Figure shows the acceleration – time (a–t) graph of a body moving in a straight line. Which graph in figure shows the velocity – time (v−t) graph of the motion of the body? (Assume that x=0 and v=0 at t=0)

The output (X) of the logic circuit shown in figure will be

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of (Neglect air friction and take g=10 m/s2)

A boat which has a speed of 5 km/hr in still water, crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is

A wire of length 2 m is suspended from the top of a roof at one end and a load of W is attached at the other end. Cross-sectional area of the wire is 5×10−7 m2 and elongation (Δl) is shown in the graph. Find the Young's modulus of elasticity of the wire material.

A 2 g bullet moving with a velocity of 210 m/s brought to a sudden stoppage by an obstacle. The total heat produced goes to the bullet. If the specific heat of the bullet is 0.03 cal/g∘C the rise in its temperature will be

A body falls freely for 10 sec. It's avg velocity during this journey is? ( g= 10 m per s square)

In figure (a square), identify the following vectors: (i) Collinear but not equal.

A tank is filled upto a height H. The horizontal range of water coming out of the hole which is at depth H4 from the surface level of water is

A pin of length 2.0 cm lies along the principal axis of a converging lens, the centre being at a distance of 11 cm from the lens. The focal length of the lens is 6 cm. Find the size of the image.

Three capacitors having capacitances 20 μF, 30 μF and 40 μF are connected in series with a 12 V battery. Find the charge on each of the capacitors. How much work has been done by the battery in charging the capacitors ?

Two trains are each 50 m long moving parallel towards each other at speeds 10 m/s and 15 m/s respectively. After what time will they pass each other?

Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

What is the maximum number of emission lines obtained when the exited electron of a H atom in n=6 drop to the ground state ?

A simple pendulum is oscillating without damping.When the displacement of the bob is less than maximum, its acceleration vector →a is correctly shown in

Two balls at same temperature collide. What is conserved?

Uniform velocity and constant velocity the same or not

Six particles each of mass 5 kg are placed along the circumference of a circle of radius 3 m. What is the moment of inertia of the system about an axis passing through the centre of the circle and perpendicular to the plane of the circle?

The elecrostatic potential at a point (x,y,z) is given by V= x2y + 2z. Calculate the electrostatic field at the point (2,1,1)

A monkey of mass 40 kg climbs up a rope of breaking load 600 N, hanging from a ceiling. If it climbs up the rope with maximum possible acceleration, then the time taken by the monkey to climb up is: (Length of the rope is 10 m and g=10 m/s2).

If an object is thrown horizontally with an initial speed 10 M per second from the top of the building of height hundred metre. what is horizontal distance covered by the particle?

Given C=400+0.9Y and I=4,000, find: (i) Y at equilibrium (ii) S and C at equilibrium

A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The outward flux over the surface of the cylinder is given by

When 100J of work is done on a fly wheel, it's angular velocity is increased from 60rpm to 180rpm. What is theomens of inertia

A body cools down from 500C to 450C in 5 minutes and to 400C in another 8 minutes. Find the temperature of the surrounding.

A bullet of mass 20 g enters into a fixed wooden block with a speed of 40 ms−1 and stops in it. Find the change in internal energy during the process.