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A body of mass is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3rR. The change in gravitational potential energy of the body is

Subtract the gravitational potential energy at initial state from GPE at at final state.... View Article

There are two bodies of masses 100 and 10000 separated by a distance 1. At what distance from the smaller body, the intensity of gravitational field will be zero

From the above figure, we can say that the point O is at a distance of Xm from 100kg. The gravitational field from this point between the two... View Article

Which of the following planet is nearest to the Sun? Does it have any moon?

Mercury is the nearest planet to Sun, and it has no moons i.e. it does not have any natural satellite. ... View Article

Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with aconstant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will [MP PMT 1999]

Effective length between A and B remains same.... View Article

Statement 1: Moon is a natural satellite of earth. Statement 2: Man made satellites launched from earth to orbit around it, are known as artificicial satellites, but moon is a naturally occuring celestial body,which revolves around the earth.

Since, moon is a naturally occurring celestial body, which revolves around the earth, and thus it is a natural satellite of earth, but the... View Article

Any celestial body revolving around another celestial body is known as its

Any celestial body revolving around other celestial body is known as is satellite. For example, Moon revolves around earth in definite orbit, so... View Article

A thin slice is cut out of a glass cylinder along aplane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be

The cylindrical surface touches the glass plate along a line parallel to axis of cylinder. The thickness of wedge shaped film increases on both... View Article

Abeam of light AO is incident on a glass slab in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that[CPMT 1986]

In the arrangement shown, the unpolarised light is incident at polarising angle of 90° - 33° = 57°. The reflected light is thus plane polarised... View Article

Statement 1: Besides revolving around the Sun, a planet rotates on its own axis.Statement 2: All planets revolve around the sun and rotate on their own axis.

All planets revolve around the sun and rotate on their own axis. The phenomenon of day and night occurs because of earth's rotation about its own... View Article

Earth takes 365 days to revolve around the Sun whereas, Mars takes 687 days to complete one revolution around the sun. Why do Mars take more time than earth to complete its revolution around the Sun?

Since, Mars is at a greater distance than earth from the Sun. Therefore, Mars takes more time to complete a revolution around the Sun, and one... View Article

An electric potential difference will be induced betweenthe ends of the conductor shown in the diagram, when the conductor moves in the direction

Conductor cuts the flux only when, if it moves in the direction of M. ... View Article

Statement 1: Planets revolving around the sun never collide. Statement 2: Planets revolve around the sun in a definite path known as orbit.

All planets revolve around the sun in a definite path, known as orbit. Every planet has a unique orbit around the sun. For this reason, none of... View Article

Comment on the statements. Statement 1: Stars twinkle but planets do not. Statement 2: Stars have their own light but a planet does not.

Our sun is the nearest star. Stars are farther away from us than planets, the light from stars passes through various layers with different... View Article

Which star is the source of light and heat for all the planets including earth in our solar system?

Answer: Sun is a star and is known to be a source of light and heat for all the planets including earth. The Sun is the source of almost all... View Article

In human eye, the image of an object is formed at______

Answer: In the human eye, the image of an object is formed at the retina. The eye is an important and one of the most complex sense organs... View Article

What does the solar system consist of?

Answer: The sun and the celestial bodies that revolve around it form the solar system. These include the sun itself, Planets, Comets, asteroids... View Article

The most comfortable distance at which one can read with a normal eye is about ________ cm.

The most comfortable distance at which one can read with a normal eye is about 25 cm.... View Article

Atul came to know from his father that pole star is the only star in the sky that does not move as the night passes. But his father did not tell him the reason. Can you help him?

Stars appear moving because of earth's rotation. But pole star is located in direction of earth's axis. So there is no effect of rotation on the... View Article

A N-typesemiconductor is [AFMC 1988; RPMT 1999]

N-type semiconductors are neutral because neutral atoms are added during doping. ... View Article

What is the principle behind ocean thermal energy?Statement1: The warm water at surface is used to boil ammonia , which vaporizes and then used to rotate turbine. Statement 2: the ammonia is vaporized as only then it gains sufficient kinetic energy for power generation.

The water at the surface of the sea or ocean is heated by the Sun while the water in deeper sections is relatively cold. This difference in... View Article

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