1990 - WAEC Physics Past Questions and Answers - page 2
11
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
A
0.02s
B
0.20s
C
0.83s
D
1.20s
12
The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10kg, calculate the tension T in the string. (Take g = 10ms2)
A
20/√3N
B
20N
C
50N
D
200√3N
13
An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
A
4.50N
B
4.67N
C
5.50N
D
6.67N
correct option: c
Users' Answers & Comments14
The absolute zero temperature is defined as the temperature at which
A
thermal motion ceases
B
the temperature of a gas is 273oC
C
ice melts
D
the volume of a real gas is maximum
correct option: a
Users' Answers & Comments15
A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?
A
1/3α Vt
B
1/2α Vt
C
α Vt
D
2α Vt
correct option: e
Users' Answers & Comments16
Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?
A
22.5oC
B
32.4oC
C
77.0oC
D
87.0oC
17
Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the
A
volume of P is greater than that of Q
B
specific heat capacity of P is higher than that of Q
C
density of P is greater than that of Q
D
density of P is lower than that of Q
correct option: b
Users' Answers & Comments18
lf the temperature of a small quantity of water in a closed container is gradually increased from 0o to 40oC then the density of the water within this range
A
increases for a while and then decreases
B
decreases for a while and then increases
C
increases gradually
D
decreases gradually
correct option: a
Users' Answers & Comments19
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
A
1.38 x 106 J
B
2.53x104J
C
7.66x103J
D
1.38x103J
20
Heat transfer by convection in a liquid is due to the
A
translatory motion of the molecules of the liquid
B
increased vibration of the molecules of the liquid about their mean positions
C
expansion of the liquid as it is heated
D
latent heat of vaporization of the liquid
correct option: a
Users' Answers & Comments