Practice MCQ Questions and answers on Physics-GK

Light from Sun reaches Earth in approximately 8 minutes.

Light cannot pass through book.

The speed of light in air is 3 × 10⁸ m/s.

Eclipses occur due to rectilinear propagation of light.

When a bottle of perfume is opened in a corner of a room, the scent soon spreads all over the room. This physical procedure is called diffusion, due to which the liquid or gaseous molecules travels from the area of higher density to that of the lower density of that substance.

Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.

Some of the examples of aerosols are fog, dust, smoke, geyser steam etc. They can be natural or anthropogenic. Mud is not an aerosol.

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.

Any matter that is a solid has a definite shape and a definite volume. The molecules in a solid are in fixed positions and are close together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.

The amount of matter in a ball of steel is its mass.