The oxone layer protects all life on earth from the harmfull______rays of the sun.

The life on earth is protected from ultraviolet radiation of the sun.

The Ozone Day is observed every year on September 16 as on this day in 1987 the _______ was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra violet rays of the sun from reaching the earthh, Fill the correct word in blank.

Which of the following is/are correct about solar cooker? 1. Solar cookers achieve a higher temperature by using mirrors to focus the rays of the Sun. 2. It works on the principle that a black surface absorbs more heat. Choose the correct option from the codes given below:

Assertion (A): Ozone layer protects the UV rays entering the Earth. Reason (R): UV rays may cause melanoma.

Arrange the following statements in correct sequence: 1. These vapours condense to form tiny droplets of water. 2. The water droplets come together to form large water droplets. 3. The heat of the sun causes evaporation of water from the surface of the earth, oceans, lakes, rivers and other water bodies. 4. The large water droplets become heavy and the air cannot hold them, therefore, they fall as rains. 5. Water vapour is also continuously added to the atmosphere through transpiration from the surface of the leaves of trees. 6. Warm air carrying clouds rises up. 7. Higher up in the atmosphere, the air is cool. 8. These droplets floating in the air along with the dust particles form clouds.

A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50 x× 10^(8) km away from the sun ?

The escape speed of a projectile on the earth’s surface is 11.2 km s^(–1) . A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets.

A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero ? Mass of the sun = 2 xx 10^(30) kg. Mass of the earth = 6xx10^(24) kg. Neglect the effect of other planets etc. (orbittal radtus = 1.5 xx 10^(11) m ).

The energy from the sun reaches just outside the earth's atmoshphere at a rate of 1400 W m^(-2) . The distance between the sun and the earth is 1.5 xx 10^(11) m . (a) Calculate the rate at which the sum is losing its mass. (b) How long will the sun last assuming a constant decay at this rate? The present mass of the sun is 2 xx 10^(30) kg