Waec Physics Past Questions and Answers

Question 2041:

• WAEC 2021

The handle of a screw jack is 35 cm long and pitch of the screw is 0.5 cm. What force must be applied at the end of the handle to lift a load of 2000N, if the efficiency of the jack is 30% [π = 22/7]?

A. 152.0N
B. 132.0N
C. 15.2N
D. 440.0N

Question 2042:

• WAEC 2021

The inductive reactance in a circuit of frequency 100Hz is 1ohms. Calculate the inductance of the inductor[π = 3.14]

A. 2.00 x 10\(_{-3}\)H
B. 1.59 x 10\(_{-3}\)H
C. 1.09 x 10\(_{-3}\)H
D. 6.28x 10\(_{-3}\)H

Question 2043:

• WAEC 2021

The diagram illustrates the velocity- time graph of a body. Calculate the distance covered by the body. during the motion.

A. 15m
B. 84m
C. 72m
D. 48m

Question 2044:

• WAEC 2021

An atom that emits an a-particle?

A. May become a different element.
B. Becomes a different isotope of the element.
C. Daughter with increased mass.
D. Becomes a daughter of a different element always.

Question 2045:

• WAEC 2021

Which of the following units is equivalent to the unit of electric current?

A. C s\({-1}\)
B. W
C. J s\({-1}\)
D. C