What is Sun’s diameter?
- (A) 1.1 million km
- (B) 1.4 million km
- (C) 2.1 million km
- (D) 2.4 million km
- (B) 1.4 million km
Heat received by the Earth from the Sun is known as:
- (A) Insolation
- (B) Solar radiation
- (C) Solar heat
- (D) Thermal radiation
- (B) Solar radiation
What percentage of ‘Insolation’ is received by the earth surface?
- (A) 47%
- (B) 51%
- (C) 63%
- (D) 71%
- (A) 47%
_______ is the amount of solar radiation that is received by a planet.
- (A) Solar irradiance
- (B) Insolation
- (C) Solar radiation
- (D) Heat balance
- (B) Insolation
The speed of rotation of earth is:
- (A) 12.8 km/sec
- (B) 22.8 km/sec
- (C) 29.8 km/sec
- (D) 35.8 km/sec
- (C) 29.8 km/sec
Cycle of the seasons is caused due to:
- (A) Rotation
- (B) Revolution
- (C) Gravitation
- (D) Specific gravity
- (B) Revolution
Days and nights occur on the earth due to:
- (A) Rotation
- (B) Longitude
- (C) Revolution
- (D) Gravitation
- (A) Rotation
Which is the largest source of light on the earth?
- (A) The moon
- (B) The sun
- (C) The space
- (D) The satellite
- (B) The sun
A year on earth with 366 days is called:
- (A) Light year
- (B) Leap year
- (C) Normal year
- (D) Earth year
- (B) Leap year
Earth revolves round the sun in its orbit by approximately:
- (A) 1° per day
- (B) 2° per day
- (C) 3° per day
- (D) 4° per day
- (A) 1° per day