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Physics

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33. Assertion : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant. Reason : No torque is acting on the rotating planet. So its angular momentum is constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion :   Gravitational field is zero both at centre and infinity.

Assertion :   Gravitational field is zero both at centre and infinity. Reason        :   The dimensions of gravitational field...
Assertion :   The speed of revolution of an artificial satellite revolving very near the earth is 8 kms-1. Reason...

Assertion : The speed of satellite always remains constant in an orbit. Reason : The speed of a satellite depends on its path.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A person sitting in an artificial satellite revolving around the earth feels weightless. Reason : There is no gravitational force on the satellite.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : For a satellite revolving very near to earth’s surface the time period of revolution is given by 1 hour 24 minutes. Reason : The period of revolution of a satellite depends only upon its height above the earth’s surface.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : If earth were a hollow sphere, gravitational field intensity at any point inside the earth would be zero. Reason : Net force on a body inside the sphere is zero.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places. Reason : The value of acceleration due to gravity is independent of rotation of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : We can not move even a finger without disturbing all the stars. Reason : Every body in this universe attracts every other body with a force which is inversely proportional to the square of distance between them.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The binding energy of a satellite does not depend upon the mass of the satellite. Reason : Binding energy is the negative value of total energy of satellite.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Space rockets are usually launched in the equatorial line from west to east. Reason : The acceleration due to gravity is minimum at the equator.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A body becomes weightless at the centre of earth. Reason : As the distance from centre of earth decreases, acceleration due to gravity increases.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height. Reason : The path of a projectile is independent of the gravitational force of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : When distance between two bodies is doubled and also mass of each body is also doubled, gravitational force between them remains the same. Reason : According to Newton’s law of gravitation, force is directly proportional to mass of bodies and inversely proportional to square of distance between them.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The time period of revolution of a satellite close to surface of earth is smaller than that revolving away from surface of earth. Reason : The square of time period of revolution of a satellite is directly proportional to cube of its orbital radius.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Two different planets have same escape velocity. Reason : Value of escape velocity is a universal constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The principle of superposition is not valid for gravitational force. Reason : Gravitational force is a conservative force

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The time period of geostationary satellite is 24 hours. Reason : Geostationary satellite must have the same time period as the time taken by the earth to complete one revolution about its axis.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Earth has an atmosphere but the moon does not. Reason : Moon is very small in comparison to earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : If an earth satellite moves to a lower orbit, there is some dissipation of energy but the satellite speed increases. Reason : The speed of satellite is a constant quantity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

14. Assertion : Orbital velocity of a satellite is greater than its escape velocity. Reason : Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A planet moves faster, when it is closer to the sun in its orbit and vice versa. Reason : Orbital velocity in orbital of planet is constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Even when orbit of a satellite is elliptical, its plane of rotation passes through the centre of earth. Reason : According to law of conservation of angular momentum plane of rotation of satellite always remain same.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Gravitational potential of earth at every place on it is negative. Reason : Every body on earth is bound by the attraction of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The ratio of inertial mass to gravitational mass is equal to one. Reason : The inertial mass and gravitational mass of a body are equivalent.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A force act upon the earth revolving in a circular orbit about the sun. Hence work should be done on the earth. Reason : The necessary centripetal force for circular motion of earth comes from the gravitational force between earth and sun.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : There is no effect of rotation of earth on acceleration due to gravity at poles. Reason : Rotation of earth is about polar axis

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth. Reason : The value of acceleration due to gravity is minimum at the equator and maximum at the pole.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...
A shell of mass M and radius R has a point mass m placed at a distance r from its...

The correct graph representing the variation of total energy

The correct graph representing the variation of total energy  (Et )kinetic energy  (Ek )and potential energy (U) of a satellite...

5. Assertion : If a pendulum is suspended in a lift and lift is falling freely, then its time period becomes infinite. Reason : Free falling body has acceleration equal to acceleration due to gravity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The value of acceleration due to gravity does not depend upon mass of the body on which force is applied. Reason : Acceleration due to gravity is a constant quantity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The universal gravitational constant is same as acceleration due to gravity. Reason : Gravitational constant and acceleration due to gravity have same dimensional formula.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Gravitational force between two particles is negligibly small compared to the electrical force. Reason : The electrical force is experienced by charged particles only.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

1. Assertion : Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution. Reason : According to Kepler’s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

The curves for potential energy (U) and kinetic energy

The curves for potential energy (U) and kinetic energy  (Ek) of a two particle system are shown in figure. At...

Which of the following graphs represents the motion of a planet moving about the sun

Answer: c (12)

Which one of the following graphs represents correctly the variation of the gravitational field (F) with the distance (r) from the centre of a spherical shell of mass M and radius a

Which one of the following graphs represents correctly the variation of the gravitational field (F) with the distance (r) from...

Suppose, the acceleration due to gravity at the earth’s surface is

Suppose, the acceleration due to gravity at the earth’s surface is 10 m/s2 and at the surface of Mars it...

By which curve will the variation of gravitational potential of a hollow sphere of radius R with distance be depicted

Answer: c (10)

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