Waec Physics 2019 Past Questions and Answers

Question 6:

• WAEC 2019

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

A. 48.6°
B. 19.5°
C. 20.0
D. 45.0

Question 7:

• 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 8:

• 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 9:

• 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 10:

• 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