Which celestial object is responsible for blocking the light of the sun during
i.a solar eclipse and ii.a lunar eclipse.

During a solar eclipse, the sun's light is blocked for some time.

Explain lunar and solar eclipses with the help of diagrams.

A solar eclipse occurs when the earth, the sun and the moon are in the same plane and

In which region of the Earth's shadow is the moon, when a total lunar eclipse takes place?

The type of eclipse takes place when the view of the sun is partially blocked by the moon

The change in the value of acceleration of earth toward sun, when the moon coomes from the position of solar eclipse to the position on the other side of earth in line with sun is : (mass of moon =7.36xx10^(22) kg, orbital radius of moon =3.8xx10^(8) m.)

The radiations emitted by the sun are analyzeed and the spectral energy distribution curve is plotted. as shown. The radius of the sun is R , the earth is situated a distance 'd' from the sun. Treat the sun as perfectly black body which radiates power at constant rate fill till its store of hydrogen gets exhausted. (Stefan's constant = sigma , Wien's constant =b , speed of light =c ) If the earth is at a distance 'd' from the sun the intensity of light falling on the earth (called solar constant S) is

Column I contains the path traced by light rays abnd the positions of object and image, with a reflecting spherical mirror. Choose the possible for type of mirror and the nature of image rom column II to each case in column -I

Which of the following statement are true for genetic drift ? I. It upsets the Hardy-Weinberg equilbrium II. It operates only in small population III. It is responsible for preserving certain genes IV. It is responsible for eliminating certain genes

Column I describes some situations in which a small object moves. Column II describes some characteristics of these motion. Match the situtions in column I with the characteristics in column II.