CSS MCQs

Grooves help tyres maintain contact with the road.
They also channel water away and reduce skidding.

A raised object has energy because of its position in a gravitational field.
This energy can convert to kinetic energy as it falls.

Oil forms a lubricating layer between moving surfaces.
This reduces friction, wear, and overheating.

Kinetic energy is the energy of motion.
It depends on the object's mass and speed.

Inertia causes an object to remain at rest or in uniform motion unless acted on.
Greater mass generally means greater inertia.

The fan's motor converts electrical energy into rotation.
Some energy is also lost as heat and sound.

Their bodies tend to continue moving forward when the bus stops.
This is an example of inertia of motion.

Chemical reactions inside a battery create an electric potential.
The stored chemical energy is converted into electrical energy.

Newton's third law describes paired interaction forces.
Each force is matched by an equal force in the opposite direction.

Solar cells use the photovoltaic effect.
They convert light directly into electrical energy.

The rocket pushes exhaust gases downward.
The gases exert an equal and opposite force on the rocket.

A microphone detects sound vibrations.
It converts them into corresponding electrical signals.