Waec Physics Past Questions For Year 1989
Question 6
A piece of cork floating on water is acted upon by the forces of...
- A. Weight and viscosity
- B. weight and upthrust
- C. upthrust and viscosity
- D. weight only
- E. upthrust only
Question 7
A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).
- A. 8g
- B. 25g
- C. 30g
- D. 40g
- E. 50g
Question 8
Which of the following is used to determine the relative density of the acid in a car battery?
- A. Hypsometer
- B. Hygrometer
- C. Manometer
- D. Hydrometer
- E. Spectrometer
Question 9
Which of the followiempeng statements is/are not correct?
- A. Evaporation takes place only at the surface of the liquid
- B. Boiling takes place throughout the volume of the liquid
- C. Evaportaion takes place at all temperatures
- D. Boiling takes place at a particular temperature for a liquid at a fixed external pressure
- E. The boiling point of a liquid is not affected by impurities
Question 10
Which of the following surfaces will radiate heat energy best?
- A. Red
- B. White
- C. Black
- D. Yellow
- E. Blue
