Waec Physics 1988 Past Questions and Answers

Question 36:

• WAEC 1988

Local action is normally prevented from taking place in a simple electric cell by

A. Introducing an oxidising agent into the acid
B. Not drawing current continuously for long periods
C. Amalgamating the surface of the zinc plate
D. Using a porous pot to isolate the zinc plate from the acid
E. Using dilute sulphuric acid

Question 37:

• WAEC 1988

A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively. Calculate the internal resistance of the cell.

A. 0.2Ω
B. 0.4Ω
C. -1.0Ω
D. 3.0Ω
E. 9.0Ω

Question 38:

• WAEC 1988

A battery of emf 24V and internal resistance 4Ω is connected to a resistor of 32Ω. What is the terminal p.d of the battery?

A. 24.0V
B. 21.3V
C. 16.0V
D. 2.7V
E. 2.0V

Question 39:

• WAEC 1988

Two parallel conductors carry equal currents in the same direction. Which of the following statement is not a correct observation?

A. Each of teh conductors will experience a force
B. Each of the conductors can move
C. The forces on the conductors will be equal
D. There are concentric lines of force around each conductor
E. The two conductors will repel each other

Question 40:

• WAEC 1988

It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).

A. 64 minutes
B. 32 minutes
C. 8 minutes
D. 2 minutes
E. 1 minute