In the following questions, Statement of assertion (A) is followed by a statement of reason (R). 1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.
Assertion: The stars twinkle while the planets do not. Reason: The stars are much bigger in size than the planets.A) 1
B) 2
C) 3
D) 4
Correct Answer: B
Solution :
Stars twinkle because of turbulence in the earths atmosphere. The atmosphere is made up of several layers. Each layer has a different temperature and density. As the light from a star passes through the atmosphere, it is bent by each layer and we perceive the twinkling. Also planets do not twinkle. Stars are so far away that they appear as point of light but planets are much closer and their disks can be seen through telescopes. Stars emit light of their own while planets do not. Stars are composed of intensely hot gases, deriving their energy from nuclear reactions going on in their interiors. Our sun is the nearest star. Star are very large, some are even bigger than planets but due to their large distance they appear smaller.
You need to login to perform this action.
You will be redirected in
3 sec
