Explanation

Explanation

Explanation

• Pressure is a fundamental physical quantity that is defined as the force exerted per unit area.
• It is a measure of the strength of a force acting on a surface.
• It is typically measured in units such as Pascals (Pa) or pounds per square inch (PSI).

Explanation

According to Boyle's Law, at constant temperature, the volume of a gas is inversely proportional to its pressure.

So, doubling the pressure will halve the volume.

Explanation

1 kilowatt hour (kWh) = 3.6 million joules (3.6 × 10⁶ J)

1 joule = 10⁷ ergs, so both joule and erg are much smaller than kilowatt hour.

Hence, Kilowatt hour is the biggest unit.

Explanation

X-rays are electromagnetic waves and not charged particles, so they are not deflected by electric or magnetic fields.

They travel in straight lines, affect photographic plates, and have properties of electromagnetic radiation.

Explanation

When two circles touch each other externally, they have a single point of contact.

The distance between their centers (C1C2) is equal to the sum of their radii (r1 + r2).

Explanation

In uniform circular motion, there is no angular acceleration (α = 0).

Since torque τ = Iα, and α = 0, torque is zero (τ = 0 Nm).

Explanation

Decaying involves the breakdown of organic matter into simpler substances through chemical reactions.

It alters the original composition of the material, which is a hallmark of a chemical change.

Explanation

Work done = F × d × cos(θ); when angle θ = 180°, cos(180°) = -1.

So, if force and displacement are antiparallel (opposite), the work is negative.