| 1. Dark matter does not interact with any electromagnetic radiation. |
| 2. Dark matter interacts with ordinary matter through gravity only. |
| 3. The force between dark matter and ordinary matter is repulsive. |
A) 1 only.
B) 1 & 2only.
C) 2 & 3 only.
D) 1, 2 & 3.
Correct Answer: B
Solution :
The name refers to the fact that it does not emit or interact with electromagnetic radiation, such as light, and is thus invisible to the entire electromagnetic spectrum. The most widely accepted hypothesis on the form for dark matter is that it is composed of weakly interacting massive particles (WIMPs) that interact only through gravity and the weak force. Dark matter was first detected as a result of strong unexplained attractive effects on orbits of stars. It has since been used to account for gravitational concentrations of ordinary matter that resulted in stars and galaxies. This is again an attractive and not a repulsive effect.
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