Waec Physics 2015 Past Questions and Answers

Question 36:

• WAEC 2015

An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is

A. 4.6v
B. 6.0v
C. 8.5v
D. 12.0v

Question 37:

• WAEC 2015

An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.

A. 120 w
B. 360 w
C. 720 w
D. 2400 w

Question 38:

• WAEC 2015

Which of the following statements is correct? When capacitors of different values are connected in series

A. The same charge flows through them
B. The same voltage appears across each capacitor
C. Different quantities of charges flow through them in different voltages across them
D. Different quantities of charges flows through them with the same voltage across them

Question 39:

• WAEC 2015

Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue

A. I only
B. Ii only
C. I and ii only
D. I, ii and iii

Question 40:

• WAEC 2015

The symbol illustrated above is that of a resistor

A. Which absorb light
B. Which emits light
C. Which absorbs heat to function properly
D. Whose resistance is light dependent