WAEC Physics Past Questions & Answers - Page 31

151.

Which of the following actions would increase the electric force between two positively charged particles?
 

A.

Decreasing the mass of the particles

B.

Decreasing the distance between the particles

C.

Increasing the assistance between the particles

D.

Increasing the mass of the particles

Correct answer is B

No explanation has been provided for this answer.

152.

A diver steps off a diving platform that is 10m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's

A.

gravitational potential energy

B.

total mechanical energy

C.

kinetic energy

D.

momentum

Correct answer is A

No explanation has been provided for this answer.

154.

An electron of mass 9.1x 10\(^{31}\) kg is travelling at a speed of 2.0 x 10\(^6\)ms\(^{-1}\). Calculate the associate wavelength of the electron. [h = 6.6. x 10\(^{34}\) Js]

A.

3.63 x10\(^{10}\) m

B.

3.63 x 10\(^{-8}\) m

C.

3.63 x 10\(^{-7}\) m

D.

6.89 x 10\(^{-4}\) m

Correct answer is A

No explanation has been provided for this answer.

155.

A ray of light travels obliquely from a less dense medium to a denser medium. Which of the following statements is true about the light?
 

A.

The wavelength of the light increases in the second medium

B.

The speed of the light increases in the second medium

C.

The light refracts towards the normal

D.

There Is a change in the frequency of the light

Correct answer is C

No explanation has been provided for this answer.