Question 4166:

• WAEC 2019

A rectangular piece of iron measuring 4 cm by 3 cm at 20\(^o\)C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10\(^{-5}\) K\(^{-1}\)]

A. 12.0144 cm\(^3\)
B. 12.0346 cm\(^3\)
C. 12.0288 cm\(^3\)
D. 12.0173 cm\(^3\)

Question 4167:

• WAEC 2019

Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10\(^{-11}\) Nm\(^2\) kg\(^2\)]

A. 1.6 x 10\(^{-9}\)N
B. 1.3 x 10\(^{3}\)N
C. 2.3 x 10\(^{3}\)N
D. 5.0x 10\(^{3}\)N

Question 4168:

• WAEC 2019

The diagram above illustrates an object moving in a circular path at a constant speed. Which of the arrows indicates the direction of linear velocity?

A. Z
B. X
C. Y
D. W

Question 4169:

• WAEC 2019

Which of the following thermometers is used to measure the temperature of the human body?

A. Thermocouple
B. Alcohol-in-glass thermometer
C. Gas thermometer
D. Platinum resistance thermometer

Question 4170:

• WAEC 2019

In the diagram above, the time taken to trace a wave between P and Q is

A. 2 periods
B. 1 period
C. 1\(\frac{1}{2}\) periods
D. 1\(\frac{1}{4}\) periods