General Science 5th Class Chapter 9 Space and Satellites Solved Exercise

General Science

5th Class

Chapter 9

Space and Satellites

Questions

1. Encircle the correct option.

i. Countless shining lights seen at night on the sky are:

a. stars        b. moons        c. planets        d. different heavenly bodies

ii. How long does it take for a geo-stationary satellite to complete one orbit?

a. one day        b. one week        c. one month        d. one year

iii. First man to step on the Moon?

a. Edwin Aldrin        b. Neil Armstrong        c. Yuri Gagarin        d. Alan Shepard

iv. The system locates the position of an object on the Earth's surface is:

a. GRS        b. GMS        c. GPS        d. PGS

v. The first artificial satellite was sent into space in:

a. 1945        b. 1957        c. 1969        d. 1973

2. Write short answers.

i. Write five benefits which we get from artificial satellites.

Ans.

Radio television transmission and information by internet reached in each part of the world because of artificial satellite. We can make contact at far off places by telephone. We can correctly locate our position any where in the world. We can known about changes in the weather much earlier. This helps us to deal with floods, storms, forest fires and other disasters effectively.

ii. Moon is the natural satellite of the Earth. Is the Earth also a satellite of some bigger object? What is that object?

Ans.

Moon is natural satellite of the Earth. Earth is a natural satellite of the sun.

iii. Why does a geo-stationary satellite appear to be stationary?

Ans.

The geo-stationary satellites revolving in the orbits around the Earth with the same speed as that of the Earth therefore they are appeared to be stationary at any place.

iv. Why do the astronauts wear space dress? What are its benefits?

Ans.

Astronauts wear space dress for travelling in space without space dress and precaution measures astronauts can not survive in space. Space dress also protects astronauts from pressure and radiations.

v. Why can a telescope installed on a satellite take clearer photographs than from the Earth surface?

Ans.

A telescope is installed on a satellite to take the clear photographs and videos. These are more clear and informative than photographs taken from Earth because there is no air, water, dust and soil particles.