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Planets in Our Solar System

Stars are pri...

Question

Stars are primarily made of ___.

A

Helium and Carbon

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B

Hydrogen and Helium

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C

Carbon only

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D

Nitrogen and Carbon

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Solution

The correct option is B
Hydrogen and Helium

Stars are made up of very hot gases. These gases are mostly hydrogen and helium, which are the two lightest elements. Stars shine by the fusion of hydrogen and helium in their cores.

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Similar questions

Q. The atoms of which of the following pair of elements are most likely to exist in free state ?
(a) hydrogen and helium
(b) argon and carbon
(c) neon and nitrogen
(d) helium and neon

Q. A star converts all its hydrogen to helium, achieving a

100 %

helium composition. Next it converts the helium to carbon via the triple-alpha process,

^{4} H e +^{4} H e +^{4} H e \to^{12} C + 7.27 M e v

The mass of the star is

4.6 \times 10^{32} k g

, and it generates energy at the rate of

5.3 \times 10^{30} W

.How long will it take to convert all the helium to carbon at this rate?

Q. Question 1
Carbon exists in the atmosphere primarily in the form of:

(a) Carbon monoxide only
(b) Carbon monoxide and carbon dioxide
(c) Carbon dioxide only
(d) Methane

Q. Question 1
Carbon exists in the atmosphere primarily in the form of:

(a) Carbon monoxide only
(b) Carbon monoxide and carbon dioxide
(c) Carbon dioxide only
(d) Methane

Carbon compounds that are made up of only carbon and hydrogen are called hydrocarbons.

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Planets in Our Solar System

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