Waec Physics 2000 Past Questions and Answers

Question 26:

• WAEC 2000

In the diagram above, an incident ray AY makes an angle of 30^o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20^o, while AY is fixed, what angle will the reflected ray now make with the incident ray?

A. 70^o
B. 80^o
C. 100^o
D. 120^o

Question 27:

• WAEC 2000

A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed

A. Between its focus and the pole
B. At its focus
C. At its centre of curveture
D. Between its focus and centre of curvature

Question 28:

• WAEC 2000

A simple microscope forms an image 10cm from an eye close to the lens. If the object is 6cm from the eye, calculate the focal length of the lens

A. 3.75cm
B. 4.00cm
C. 15.00cm
D. 16.00cm

Question 29:

• WAEC 2000

When white light passes through a triangular glass prism, there is dispersion because of

A. Diffraction of light
B. Polarisation of light
C. The difference in speed of the components of light
D. The interference of light waves in glass

Question 30:

• WAEC 2000

In which of the following media does sound travel faster?

A. Water
B. Brass
C. Air
D. Wood