Waec Physics 2015 Past Questions and Answers

Question 31:

• WAEC 2015

A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms^-1]

A. 23m
B. 128m
C. 288m
D. 298m

Question 32:

• WAEC 2015

Red light travels faster than blue light when both of them pass through a glass prism because the

A. Refractive index of red light is grester than that of blue light
B. Refractive index of blue light is greater than that of red light
C. Red light is more intense than the blue light
D. Blue light is more intense than the red light

Question 33:

• WAEC 2015

An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed

A. 0.5
B. 1.5
C. 2.0
D. 3.0

Question 34:

• WAEC 2015

All electromagnetic waves in a vacuum have the same

A. Wavelength
B. Frequency
C. Speed
D. Amplitude

Question 35:

• WAEC 2015

The diagram given illustrates two charged particles W and X. The charges on W and x are respectively

A. Negative; negative
B. Negative; positive
C. Positive; positive
D. Positive; negative