Jamb Physics 2020 Past Questions and Answers

Question 26:

• JAMB 2020

Which of the following statements about defects of vision is/are CORRECT?
I. For a long sighted person, close objects appear blurred
II. For a short sighted person, distant objects appear blurred
III. Short sight is corrected by using a pair of converging lenses

A. I only
B. II only
C. I and II only
D. II and III only

Question 27:

• JAMB 2020

Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media?
I. Light is passing from optical denser medium to optically less dense medium
II. Light is passing from optically less dense medium to optically denser medium
III. Angle of incidence is greater than a certain critical value
IV. Angle of incidence is lesser than a certain critical value

A. I and II only
B. II only III only
C. III and IV only
D. I and III only

Question 28:

• JAMB 2020

The linear expansivity of brass is 2 x 10\(^{-5}\) \(^oC^{-1}\). If the volume of piece of brass is 10cm\(^3\) at 0\(^o\)C. What will be its volume at 100\(^o\)C?

A. 10.06cm\(^3\)
B. 10.04 cm\(^3\)
C. 10.02 cm\(^3\)
D. 10.20 cm\(^3\)

Question 29:

• JAMB 2020

The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

A. 55.3\(^o\)C
B. 23.3\(^o\)C
C. 49.0\(^o\)C
D. 16.43\(^o\)C

Question 30:

• JAMB 2020

Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5\(^o\)C, then the specific heat capacity of the liquid is

A. 2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
B. 2.0 x 10\(^2\)Jkg\(^-1\)
C. 4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
D. 4.0 x 10\(^4\)Jkg\(^-1\)