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

When electric current flows through a conductor, the magnetic field forms concentric circular loops around the wire. The direction can be determined using the right-hand thumb rule.

A resistor reduces the flow of electric current in a circuit by providing resistance, helping control the amount of current passing through other components.

A rainbow is caused by the dispersion of sunlight in water droplets. Different wavelengths refract at different angles, separating white light into its component colors.

The lens of the eye focuses light onto the retina by changing shape to accommodate objects at different distances, aiding clear vision.

When light enters a rarer medium from a denser medium, it bends away from the normal due to refraction, changing its speed and direction.

The critical angle is the angle of incidence at which light passing from a denser to a rarer medium undergoes total internal reflection. Beyond this angle, no refraction occurs.

Newton's law of inertia states that an object will remain at rest or continue moving at constant velocity unless acted upon by an external force.

Work = Force × Distance, where force is in newtons and distance is in metres.

The SI unit of work is the joule (J). It is the energy transferred when a force of one newton acts over a distance of one metre.

The Sun is the primary source of energy on Earth, providing light and heat that sustain life, drive weather patterns, and enable photosynthesis.

Gravitational force is a non-contact force that acts at a distance, pulling objects towards the centre of the Earth or other celestial bodies without physical contact.

A battery stores chemical energy. When connected to a circuit, this chemical energy is converted into electrical energy to power devices.

Frequency is measured in hertz (Hz), representing the number of cycles or oscillations per second. One hertz equals one cycle per second.

A plane mirror forms a virtual, upright image of the same size as the object. The image appears behind the mirror at the same distance as the object is in front.

A convex lens is used in magnifying glasses because it converges light and creates an enlarged image of the object being viewed.

The greenhouse effect is caused by increased carbon dioxide and other gases in the atmosphere, which trap heat from the Earth's surface.

In a parallel circuit, current divides among different branches, whereas in a series circuit, the same current flows throughout.

Light waves, being electromagnetic waves, can travel through a vacuum, unlike sound waves which require a medium to propagate.

The unit of electric charge is the Coulomb (C). One Coulomb is the amount of charge transferred by a current of one ampere in one second.

Ohm's law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with resistance (R) as the constant. The formula is $V = IR$.