Waec Physics Past Questions For Year 1990
Question 11
A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms-2)
- A. 66 kg
- B. 55 kg
- C. 44 kg
- D. 22 kg
- E. 11 kg
Question 12
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
- E. 360.0oC
Question 13
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
- E. 3α Vt
Question 14
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
- E. the pressure of a real gas is maximum
Question 15
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
- E. 8.50N
