Consider the following pairs:

Question

Objects in space : Description

1. Cepheids Giant clouds of dust and gas in space

2. Nebulae Stars which brighten and dim periodically

3. Pulsars Neutron stars that are formed when massive stars run out of fuel and collapse

How many of the above pairs are correctly matched?

(a) Only one

(b) Only two

(c) All three

(d) None

Answer 1

Answer:(b) Only two.

Explanation:

Let's analyze each pair:

Cepheids: Cepheids are not giant clouds of dust and gas in space. They are a type of variable star that pulsates in brightness. Therefore, pair 1 is not correctly matched.

Nebulae: Nebulae are indeed giant clouds of dust and gas in space. They are regions where stars are born or where stars undergo significant changes. Pair 2 is correctly matched.

Pulsars: Pulsars are neutron stars that emit beams of electromagnetic radiation. They are formed when massive stars run out of fuel and collapse. Pair 3 is correctly matched.