Waec Physics 2001 Past Questions and Answers

Question 26:

• WAEC 2001

An object is placed 20cm from a lens. If an image is formed on a screen 260cm away from the lens, calculate the magnification of the image

A. 28
B. 26
C. 24
D. 13

Question 27:

• WAEC 2001

A piece of cloth appears green in sunlight. When held in red light, it will appear

A. Green
B. Blue
C. Red
D. Black

Question 28:

• WAEC 2001

Dispersion of white light by a glass prism occurs because

A. White light consist of a mixture of seven different colour
B. The refractive index of glass is different from each constituent colour of white light
C. The speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
D. The speed of each colour of light in the glass is proportional to the angle of refraction in he prism

Question 29:

• WAEC 2001

Which of the following statements about sound is correct?

A. When sound travels from air to a denser medium, it is refracted away from the normal at the point of incidence
B. Sound travels faster in air than in water
C. The wavelength of sound changes when it travels from to water
D. The frequency of it travels from air to water

Question 30:

• WAEC 2001

The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements is not correct? The wave produced on the wire is

A. Stationary and lonitudinal
B. Stationary and mechanical
C. Mechanical and longitudinal
D. Progessive and transverse