Physics Fundamentals | MCQs

Explanation

The refractive index of ice is approximately 1.31, which is slightly less than that of water (1.33).

This means light travels a bit faster in ice than in liquid water.

Explanation

Sound travels at approximately 1,100 feet per second (766 miles per hour).

Radio waves travel at the speed of light, which is approximately 186,000 miles per second.

Explanation

The speed of sound depends on the medium's density and elasticity.

It travels fastest in solids (due to tightly packed molecules) and slowest in gases (like air).

Glass (Solid) – ~5,640 m/s

Water (Liquid) – ~1,480 m/s

Wood (Solid) – ~3,300–3,600 m/s

Air (Gas) – ~343 m/s

Explanation

Rest and motion are considered relative because they depend on the observer’s frame of reference.

An object may appear to be at rest in one frame and in motion in another.

Explanation

Mercury remains liquid at a wide range of temperatures, has uniform expansion.

It is easily visible due to its opacity.

It does not stick to glass, allowing accurate and consistent readings in thermometers.

Explanation

According to Newton's First Law of Motion, the mass of an object measures its inertia.

It is the resistance of an object to changes in its state of motion.

Explanation

A free-falling object near Earth's surface accelerates at approximately 9.80 m/s² due to gravity.

This is known as the acceleration due to gravity (g).

Explanation

Explanation

Speed is defined as the rate of change of position over time.

It indicating how quickly an object moves from one place to another.

It is a scalar quantity, meaning it only has magnitude and no direction.

Explanation

Projectile motion is a type of two-dimensional motion where an object moves under the influence of gravity, with a constant acceleration of g (9.8 m/s²).

It involves a combination of horizontal motion with a constant velocity and vertical motion with a constant acceleration, resulting in a curved trajectory.