Waec Physics Past Questions For Year 1989
Question 11
A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.
- A. 67.5oC
- B. 30.0oC
- C. 25.0oC
- D. 15.0oC
- E. 10.0oC
Question 12
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
- A. 120,000 W
- B. 30,000 W
- C. 333 W
- D. 300 W
- E. 30 W
Question 13
Which of the following is a derived unit?
- A. Metre
- B. Coulomb
- C. Kilogram
- D. Second
- E. Ampere
Question 14
All the heat generated by a current of 2A passing through a resistor of 6Ω for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
- A. 60 Jg-1
- B. 120 Jg-1
- C. 300 Jg-1
- D. 360 Jg-1
- E. 1500 Jg-1
Question 15
A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?
- A. the reaction force of the table on the ice breaks the ice into water molecules
- B. heat extracted from the ice block makes the ice block cold
- C. the ice block absorbs heat from the atmosphere and its temperature rises
- D. the atmosphere absorbs heat from the ice block and its temperature falls
- E. the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts
