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6. The amount of Sun’s radiation received per second by unit area of a black body on Earth with its surface perpendicular to atmosphere when the Earth is at mean distance from the sun is called
A. solar radiation
B. solar wind
C. solar energy
D. solar constant
Explanation:
7. The mass of the Sun is
A. 1.39  109 kg
B. 1.969  1030 kg
C. 1.496  1011 kg
D. 1.39  1033 kg
Explanation:
8. Sunspots represents regions of
A. high temperature
B. large magnetic field
C. craters
D. brightness
Explanation:
9. Supernova is
A. a comet
B. a proto star
C. a large nova
D. a shooting star
Explanation:
10. Primary constituents of the Sun are
A. hydrogen and heavy elements
B. hydrogen and helium
C. heavy elements
D. helium and heavy elements
Explanation:
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