4, 2, 3, 1
4, 2, 1, 3
2, 4, 3, 1
4, 2, 3, 1
A. 4, 2, 3, 1
Polaris
Alpha Centauri
Sun
Sirius
Sixteen
Ten
Six
Nine
Perigee
Apogee
Perihelion
Aphelion
1 and 2
2 and 3
3 and 4
1,2 and 4
One star
Two stars
Three stars
Four stars
Earth's revolution and inclination of its axis
Revolution
Earth's rotation and inclination of its axis
Rotation
Constellation
Asteroides
Meteores
Comets
Perigee
Perihelion
Aphelion
Apogee
Venus and Mercury
Venus and Uranus
Venus and Neptune
Mercury and Uranus
Earth is at prihelion and Moon at perigee
Earth is at aphelion and Moon at apogee
Moon and Sun are at right angles with reference to the Earth
Moon, Sun and Earth lie along a straight line
8 seconds
8 minutes
4.3 seconds
1 light year
Single stars
Binary stars
Multiple stars
Cephied stars
Carbondioxide and sulphuric acid
Carbondioxide and nitric acid
Nitrogen and sulphuric acid
Nitrogen and nitric acid
Venus
Uranus
Mercury
Mars
0.825
0.98
0.998
0.02
Increases
Decreases
Remains unchanged
First increases and then decreases
Light year
Nautical mile
Statute mile
Kilometre
1.41
1.47
0.59
0.5
Siderial Year
Solar Year
Cosmic Year
Leap Year
Direction or path of the Moon
The Moon comes between the Sun and the Earth
The Earth comes in between the sun and the Moon and the centres of all the three come on the same straight line
The average angle made by a line drawn from the Moon to the Earth
Quasars
b) Pulsar
Aurora Borealis
White Dwarfstar
Eight minutes
Ten minutes
Four minutes
Twelve minutes
47 degrees
23.5 degrees
12 degrees
30 degrees
90
80
50
100
Jupiter
Mars
Saturn
Uranus
66 years
76 years
86 years
96 years
Jupiter
Saturn
Neptune
Pluto
Quasars
Polar Auroras
Meteorites
Pulsar
Jupiter
Saturn
Uranus
Neptune
a geoid
a spherical
an oblate sphere
a flat disc