Explanation

• When the frequency of the modulated wave is less than the frequency of the carrier wave, it indicates that the input signal is negative.
• This is a characteristic of amplitude modulation (AM) where the input signal is negative, resulting in a decrease in the amplitude of the carrier wave.

Explanation

Glass is an insulator, meaning it does not conduct electricity.

Aluminium, Copper, and Silver are excellent conductors of electricity.

Explanation

Longitudinal Wave (Primary Nature):

Sound propagates as compressions and rarefactions (particles vibrate parallel to wave direction).

Example: Sound waves in air.

Mechanical Wave (Medium Dependency):

Requires a medium (solid, liquid, gas) to travel—cannot propagate in a vacuum.

Transverse Wave (In Specific Cases):

In solids, sound can also exhibit transverse wave components (particles vibrate perpendicular to the wave direction).

Explanation

Sound travels as a longitudinal wave, where particles vibrate parallel to the direction of wave motion.

In contrast, light is a transverse wave, with vibrations perpendicular to the direction of propagation.

Explanation

Work is done when a force causes displacement of an object in the direction of the force.

A man pushing against the wall, although force is applied, the wall does not move, so no displacement occurs → no work is done.

Explanation

Acceleration is related to force, mass, and change in velocity (from Newton’s 2nd Law).

It has no relation with temperature, which is a thermal property.

Explanation

Explanation

A weather balloon is not fully inflated on the ground because the air inside the balloon would expand and may burst as it rises.

The atmosphere is less dense at higher altitudes, so the pressure inside the balloon becomes greater than the pressure outside.

This causes the balloon to expand until it reaches its elastic limit and bursts.

Weather balloons typically burst at altitudes of over 15 miles (24.1 kilometers).

If a balloon were fully inflated on the ground, the gas would need to be vented out and wasted as it expands. 

Explanation

When an electron moves perpendicular to a magnetic field, the electromagnetic force (also known as the Lorentz force) acting on the electron is given by the formula:

F=qvBsin(θ)

Where:

• $F$ is the force,
• $q$ is the charge of the electron,
• $v$ is the velocity of the electron,
• $B$ is the magnetic field strength,
• $$θtheta is the angle between the velocity vector and the magnetic field.

When the electron is moving perpendicular to the magnetic field, $theta = 90^circ$ and $sin(90^circ) = 1$

Therefore, the force becomes:

$$F=qvB$$

This means the force is at its maximum value since both the charge and the velocity contribute to the force. Thus, the statement that the force acting is maximum is correct.

Explanation

Principle of superposition is applicable only for linear systems.

Superposition theorem states that in any linear, bilateral network where more than one source is present
*