Which of the following is not a planet of our solar system?

(a)

Sirius

(b)

Mercury

(c)

Saturn

(d)

Earth

In a geostationary orbit, a satellite is at a distance of _______________ from the Earth.

(a)

53,880 km

(b)

25,880 km

(c)

36,000 km

(d)

1,12,000 km

Stars in a constellation form _____________.

(a)

No shape

(b)

any arbitrary shape

(c)

a recognisable shape

(d)

a straight line always

Which of the following units is used to measure distance between the stars?

(a)

km

(b)

m

(c)

light year

(d)

fm

The member of our solar system, with highly tilted orbit is _____________.

(a)

Earth

(b)

Pluto

(c)

Mars

(d)

Saturn

What is solar system?

What is a cosmic year?

Define orbital velocity.

Define time period of a satellite.

What is a satellite? What are the two types of satellites?

Write a note on outer planets?

What are meteors and meteorites?

How are 'Galaxies' formed?

From the following data calculate the period of revolution of the moon around the earth (Radius of the earth = 6400 km; Distance of the moon from the earth = 3.84 x 10⁵km. g = 9.8 m/s²)

At an orbital height of 600 km. Find the orbital period of the satellite.

Give an account of Stars .

How Sun is formed? How it rotates?