Physics Final test (True/False Questions)

The mechanical waves need material medium to propagate.

• True
• False

The mechanical waves can pass through vacuum.

• True
• False

Electromagnetic waves cannot pass through vacuum.

• True
• False

Waves in a vibrating string are transverse waves.

• True
• False

The speed of sound depends on the density of the medium

• True
• False

The wavelength does not change after diffraction.

• True
• False

A virtual image can be focused on a screen.

• True
• False

The virtual image formed in the concave mirror is smaller than the object.

• True
• False

Only real images are formed by a concave mirror.

• True
• False

The focus of a concave mirror is a virtual focus.

• True
• False