2004 - WAEC Physics Past Questions and Answers - page 3
21
Which of the following values on the absolute scale of temperature is the ice point?
A
0K
B
32K
C
100K
D
273k
correct option: d
Users' Answers & Comments22
On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the
A
is better conductor of heat than the foot
B
mat loses heat to the bare foot at a faster rate
C
mat is better conductor of heat than the floor
D
concrete floor is a better conductor of heat than the mat
correct option: d
Users' Answers & Comments23
When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume
A
1.0000cm3
B
1.0020cm3
C
1.0036cm3
D
1.0180cm3
correct option: a
\(V_1 = \frac{V_2}{3} = \frac{1.0018}{3 \times 2.0 \times 10^{-5} \times 30 + 1}\)
= 1cm3
Users' Answers & Comments= 1cm3
24
A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg
A
79.4cm Hg
B
74.38cm Hg
C
74.2cm Hg
D
69.4cm Hg
correct option: b
At 77cm Hg, A.P = \(\frac{75.0 \times 72.0}{72.6} = 74.38\)
Users' Answers & Comments25
On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes
A
a incease in the number of gas molecules
B
a decrease in the density of the gass
C
an increase in the average speed of the gas molecules
D
a decrease in pressure exerted by the gas
correct option: c
Users' Answers & Comments26
The temperature of 900cm3 of an ideal gas at a pressure of 114cm Hg is 27oC. Calculate its volume at 76cm Hg and 0oC
A
50.0cm3
B
546.0cm3
C
659.3cm3
D
1228.5cm3
correct option: d
\(V_2 = \frac{P_1V_1T_2}{T_1P_2} = \frac{114 \times 900 \times 273}{300 \times 76}\)
= 1228.5cm3
Users' Answers & Comments= 1228.5cm3
27
The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the
A
amplitude of the wave
B
wavelength of the wave
C
direction of vibration of the particles of the medium
D
period of vibration of the particle of the medium
correct option: c
Users' Answers & Comments28
A wave travelling from water to glass suffers a change in its speed at the common boundary. Which of the following properties explains this observation?
A
dispersion
B
refraction
C
interference
D
diffraction
correct option: b
Users' Answers & Comments29
The image of an optical pin placed at the principal focus of a concave mirror will be formed
A
between the principal focus and the pole
B
at the centre of the curvature
C
between the principal focus and the centre of curvature
D
at infinity
correct option: d
Users' Answers & Comments30
A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera
A
0.18m
B
0.50m
C
1.62m
D
18.00m
correct option: a
hi = \(\frac{ho \times v}{u} = \frac{1.8 \times 0.3}{3} = 0.18m\)
Users' Answers & Comments