Neco Physics Past Questions and Answers

Question 236:

• NECO 2005

A radio station broadcasts at a frequency of 400KHz. If the speed of the wave is 3.0 ×10-8 ms-1, calculate the wavelength of the radio wave.

A. 1.3 × 10²m
B. 3.0 × 10²m
C. 2.4 × 10²m
D. 5.0 × 10²m
E. 7.5 × 10²m

Question 237:

• NECO 2005

Which of the following is/are longitudinal wave(s)?

I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string

A. I only
B. II only
C. I and II only
D. I and III only
E. II and III only

Question 238:

• NECO 2005

Which of the following radiations has the shortest wavelength?

A. Infrared rays
B. Light waves
C. Microwaves
D. Ultraviolet rays
E. X-rays

Question 239:

• NECO 2005

Which of the following statements is/are correct? Sound waves travel through

I. air
II. vacuum
III.Water

A. II only
B. I and II only
C. II and III only
D. I and III only
E. I, II, and III

Question 240:

• NECO 2005

An electric motor primary converts

A. Electrical energy to chemical energy
B. Electrical energy to heat energy
C. Electrical energy to mechanical energy
D. Mechanical energy to electrical energy
E. Mechanical energy to light energy