1999 - WAEC Physics Past Questions and Answers - page 3
21
A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is
A
20o
B
40o
C
80o
D
120o.
correct option: b
Users' Answers & Comments22
The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be
A
mechanical and transverse
B
progressive and longitudinal
C
stationary and transverse
D
stationary and longitudinal.
correct option: d
Users' Answers & Comments23
The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror
A
3.75cm
B
6.60cm
C
10.00cm
D
15.00cm
correct option: d
Users' Answers & Comments24
The refractive index of glass for yellow light is greater than that for red light because yellow light
A
has a greater amplitude than red light
B
is more intense than red light
C
travels more slowly than red light
D
deviates less than red light
correct option: a
Users' Answers & Comments25
The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance
A
60cm
B
30cm
C
20cm
D
15cm
correct option: c
Users' Answers & Comments26
Which of the following statements is not correct about long sight?
A
A Iong-sighted person can see distant objects clearly
B
ight from a nearby object is focused behind the retina.
C
The eyeball is too short
D
The defect is corrected by using a diverging lens.
correct option: d
Users' Answers & Comments27
The amplitude of a wave is the
A
distance between two successive troughs of the wave
B
separation of two adjacent particles vibrating in phase
C
maximum displacement of the wave particle from the equilibrium position
D
distance travelled by a wave in a complete cycle of its motion
correct option: c
Users' Answers & Comments28
ln order to obtain a sound note of a high pitch from a wire stretched by a constant tension, the wire must be
A
short and thick
B
short and thin
C
long and thick
D
long and thin
correct option: b
Users' Answers & Comments29
If the position of resonance in a resonance tube is 16.50cm from open end of the tube, calculate the distance from the open end to the next position where resonance occurs. (Neglect end-correction)
A
24.75cm
B
33.00cm
C
41.25cm
D
49.50cm
correct option: d
Users' Answers & Comments30
Thunder is usually heard some seconds after lightning is observed because
A
the human eye is more sensitive to light than the ear to sound
B
sound and light travel in different media
C
thunder occurs after lightning
D
light travels faster than sound
correct option: d
Users' Answers & Comments