Which of the following waves requires a material medium for its propagation?
Radio waves
Light waves
Sound waves
X-rays
Correct answer is C
- Electromagnetic waves are waves that have no medium to travel whereas mechanical waves need a medium for its transmission.
- sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.
The average distance moved by a molecule between collisions is called
molecular distance
intermolecular distance
mean distance
mean free path
Correct answer is D
- the mean free path is the average distance traveled by a moving particle (such as an atom, a molecule, a photon) between successive impacts .
Which of the following machines does not apply the lever principle?
Claw hammer
Wheelbarrow
Single pulley
sugar tong
Correct answer is C
A single pulley is a device composed of a wheel on an axle over which a rope, cord, or similar implement is looped.
increase in value
decrease slightly
remain unchanged
drop to zero
Correct answer is A
No explanation has been provided for this answer.
An image formed on a screen is always?
inverted
magnified
upright
virtual
Correct answer is A
No explanation has been provided for this answer.