Waec Physics 2018 Past Questions and Answers

Question 31:

• WAEC 2018

To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed

A. Between the focus and the lens
B. At the focus
C. Between the focal length and twice the focal length
D. Beyond twice the focal length

Question 32:

• WAEC 2018

The diagram above represents a transverse travelling wave. Which two points are 180° out of phase?

A. A and E
B. B and D
C. C and F
D. D and H

Question 33:

• WAEC 2018

Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q. \([G= 6.67 \times 10^{-11} Nm^{2}kg^{-2}]\)

A. \(1.11\times 10^{-7} N\) towards P
B. \(1.11\times 10^{-7} N\) towards Q
C. \(9.26\times 10^{-8} N\) towards P
D. \(9.26\times 10^{-8} N\) towards Q

Question 34:

• WAEC 2018

The primary of a transformer has 100 turns and its secondary has 200 turns. If the voltage at the primary is 100V, determine the voltage at the secondary.

A. 50V
B. 100V
C. 200V
D. 400V

Question 35:

• WAEC 2018

In the diagram illustrated a block of mass M is at rest on a plane inclined at an angle \(\theta\) to the horizontal. As \(\theta\) increases, the velocity ratio of the plane

A. Increases
B. Decreases
C. Remain the same
D. Decreases and later increases