Physics in Class 10 : Practice MCQ Questions & Answers with Explanations

Electric power is calculated using Power = Voltage × Current. This shows how much energy is consumed or generated per unit of time in an electrical circuit.

Velocity is a vector quantity because it has both magnitude (speed) and direction. Speed has only magnitude and is a scalar quantity.

Refraction occurs when light passes from one medium to another, causing a change in speed, which results in the bending of light. It is most noticeable when light moves from air into water or glass.

The law of reflection states that the angle at which light strikes a surface (angle of incidence) equals the angle at which it reflects (angle of reflection). This principle explains how mirrors work.

Speed is the distance travelled per unit of time. The formula is Speed = Distance / Time.

The speed of sound in air at room temperature (about 20°C) is approximately 340 metres per second. This speed varies with temperature and the medium through which sound travels.