Pakistan MCQs

Density compares mass with the space occupied.
It is calculated as mass divided by volume.

Gravity continuously accelerates the ball downward.
After slowing to a stop, it begins falling.

Ice has an open crystal structure that occupies more volume.
Its lower density causes it to float on water.

Friction resists sliding or rolling between surfaces.
It can produce heat and slow moving objects.

Freezing expands water into a less dense solid structure.
The resulting ice is buoyant in liquid water.

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.