Explanation

A magnetic compass needle aligns itself with the Earth’s magnetic field.

Therefore, it always points in the North-South direction.

Explanation

The north pole of a magnet is usually painted red for easy identification.

The south pole is typically painted blue.

Explanation

• Light travels in a straight line.
• It is also known as a rectilinear path.
• It in a homogeneous medium like air or vacuum.

Explanation

Heat of reaction refers to the amount of heat released or absorbed during a chemical reaction.

If heat is released, the reaction is exothermic; if absorbed, it's endothermic.

Explanation

Escape velocity is the minimum speed a spacecraft needs to completely overcome Earth's gravitational pull without further propulsion.

For Earth, this velocity is approximately 11.2 km/s.