Explanation

• A plane mirror produces an image that is the same size as the object.
• The mirror doesn't magnify or reduce the image, it simply reflects it.

Explanation

Sound waves in air are longitudinal waves

Because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

Explanation

Explanation

• Concave lenses are also known as diverging lenses. 
• Shape: Thinner in the middle and thicker at the edges.
• Image: They produce smaller, upright, virtual images.
• Use: Often used in eyeglasses to correct myopia (nearsightedness). 

Last updated on 09-03-2026

Explanation

Diamond is an excellent conductor of heat due to strong covalent bonding and crystal structure.

It is a strong electrical insulator because it lacks free electrons to carry current.

Explanation

Explanation

Temperature is directly proportional to the average kinetic energy of gas molecules.

At 0 K (absolute zero), molecular motion ceases, so their kinetic energy becomes zero.

Explanation

Water absorbs red light strongly, so it doesn’t penetrate much.

The scattered shorter wavelengths (like green/blue) dominate, making it appear green.

Explanation

Sound travels fastest in solids because particles are closely packed, allowing quicker vibration transfer.

Velocity of sound: Metal > Water > Air > Vacuum (no sound in vacuum).

Explanation

Electrostatic potential is a scalar quantity because it has magnitude only, no direction.

In contrast, magnetic moment, electric field, and acceleration due to gravity are vector quantities.