Jamb Physics 2023 Past Questions and Answers

Question 41:

• JAMB 2023

The number of holes in an intrinsic semiconductor

A. Is not equal to the number of free electrons
B. Is greater than the number of free electrons
C. Is equal to the number of free electrons
D. Is less than the number of free electrons

Question 42:

• JAMB 2023

Name the type of equilibrium for each position of the ball

A. A - unstable, B - neutral, C - stable
B. A - stable, B - neutral, C - unstable
C. A - stable, B - unstable, C - neutral
D. A - unstable, B - stable, C - neutral

Question 43:

• JAMB 2023

Rainbow formation is as a result of the combination of which of the following phenomena?
(i) Reflection
(ii) Dispersion
(iii) Total internal reflection
(iv) Refraction

A. (ii) and (iv) only
B. (i), (iii) and (iv) only
C. (ii), (iii) and (iv) only
D. (i), (ii) and (iv) only

Question 44:

• JAMB 2023

The surface temperature of a swimming pool on a warm day is 25ºC and the temperature at the bottom is 15ºC. If the swimming pool has a surface area of 620 \(m^2\) and a depth of 1.5m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the swimming pool.

[Thermal conductivity of water (k) = 0.6071 Wm-1K-1]

A. 2.5kw
B. 250kw
C. 300kw
D. 3.0kw

Question 45:

• JAMB 2023

Which process is responsible for production of energy in stars?

A. Nuclear reaction
B. Nuclear fission
C. Nuclear fusion
D. Radioactive decay