Who proposed the heliocentric model of the universe?

(a)

Tycho Brahe

(b)

Nicolaus Copernicus

(c)

Ptolemy

(d)

Archimedes

The period of revolution of planet A around the Sun is 8 times that of planet B. How many times is the distance of planet A as great as that of planet B?

(a)

4

(b)

5

(c)

2

(d)

3

The Big Bang occurred ________ years ago.

(a)

13.7 billion

(b)

15 million

(c)

15 billion

(d)

20 million

The speed of Sun in km/s is _______.

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250

India’s first satellite is _______.

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Aryabhatta

The number of planets in our Solar System is _______.

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8

The distance between Saturn and Uranus is about 10 times as that between Earth and Mars.

(a) True

(b) False

Halley’s comet appears after nearly 67 hours.

(a) True

(b) False

Mars is called the red planet.

(a) True

(b) False

Jupiter

(1)

9 hours 55 min

Mercury

(2)

87.97 days

Venus

(3)

24 hours 37 min

Saturn

(4)

243 days

Mars

(5)

10.7 hours

Why do some stars appear blue and some red?

How is a satellite maintained in nearly circular orbit?

What is solar system?

Define orbital velocity.

State Kepler’s laws.

Discuss the benefits of ISS.