Explanation

Rockets move forward in space due to Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. 

When a rocket engine burns fuel, it expels hot gases out of the nozzle.

This expelled gas exerts a force downwards, and in reaction.

The rocket experiences an equal force upwards, propelling it forward.

Explanation

Motion along a straight line occurs in one dimension only.

Examples include a car moving on a straight road or a free-falling object.

Explanation

Ampere-hour (Ah) measures the total electric charge transferred by a current of one ampere flowing for one hour.

It is widely used to express the capacity of batteries.

Explanation

Sound wave is a mechanical  wave.

Electromagnetic waves are waves that consist of oscillating electric and magnetic fields

That propagate through space without needing a medium.

Sound waves, on the other hand, are mechanical waves that require a medium (like air, water, or solids) to travel through. 

Explanation

Explanation

Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of voltages around a closed loop is zero.

This is based on the principle of conservation of energy, as energy is neither created nor destroyed in the loop.

Explanation

A neutron has mass ≈ 1.675 × 10⁻²⁷ kg, very close to a proton’s mass.

An electron is much lighter (≈ 1/1836 of a proton), so not comparable.

Explanation

Inertia is the property of a body to resist changes in its motion.

It is directly related to mass.

Since mass is measured in kilograms (kg) in the SI system.

Inertia is expressed in kilograms.

Explanation

Velocity SI units: meters per second (m/s or m·s⁻¹).

This unit is derived from the SI units for displacement (meter) and time (second),

Velocity is defined as the rate of change of displacement over time (displacement/time). 

Explanation

The power of the lens is the reciprocal of focal length.

The SI unit is dioptre.

Dioptre (D)

Power of lens = 1/ focal length in meter.