Earth-Test 2

The earth rotates on its axis and the exact time needed for one complete rotation is

The term that best describes the shape of the earth is

The speed of rotation of the earth is the highest

The exact time taken by the earth for single rotation on its own axis is

The size of the earth was first measured by

Only one side of the moon is ever seen from the earth because

Days and nights are caused by

1. rotation of the earth on its axis
2. revolution of the earth around the sun
3. inclination of the earth’s axis

Variation in duration of day and night is due to

1. rotation of earth on its axis
2. inclination of earth round the sun
3. inclination of earth at an angle of 66 1/2 degree

The moon is called a satellite of the earth because

The crust forms what percentage of the volume of the earth ?

At a latitude of 45 degree, the earth spins on its axis at the rate of

Spring tides occur when

It is six months long day in the northern polar region and six months long night in the southern polar region because

Green House Effect means

The earth’s annual circuit round the sun covers a distance of

The earth travels around the sun in an oval path and one complete revolution needs

Insolation heats up the land masses more quickly than the water bodies because

The heaviest silicates named ‘Sima’ or silica + magnesium are most abundant in the

Which of the following statements regarding the earth’s axis are true ?

1. It makes an angle of 66 1/2 with the plane of ecliptic
2. It maintains a flexible orientation with respect to the stars
3. It is the most important fact connected with Earth-Sun relationship

Which of the following are true regarding equinoxes ?

1. They occur on March 21st and September 23rd
2. They depict equal days and equals nights on March 21st and September 23rd on all places of the earth
3. All places on the earth have equal temperature during equinoxes.

The position of the sun is annually twice over head at Singapore because of the

What is the approximate equatorial circumference of the earth ?

Spring tides occur on new moon and full moon days because on these days

The earth revolves around the sun at the speed(per minute) of

A semifluid shell which includes both the crust and the uppermost part of the mantle is known as