Jamb Physics 2020 Past Questions and Answers

Question 16:

• JAMB 2020

A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio of density of the solid to that of the kerosine is

A. 2
B. \(\frac{3}{2}\)
C. \(\frac{2}{3}\)
D. 3

Question 17:

• JAMB 2020

One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is

A. 5.16cm
B. 5.165cm
C. 5.0cm
D. 5.160cm

Question 18:

• JAMB 2020

When a sound wave passes from air into water its

A. Speed and frequency increases but its wavelength remains the same
B. Speed and wavelength increases but its frequency remains the same
C. Speed decreases
D. Speed increases but its frequency and wavelength decreases

Question 19:

• JAMB 2020

A convex mirror is used as a driving mirror because
I. its image is erect
II. It has a large field of view
III. It has a long focal length
Identify the CORRECT statement(s)

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

Question 20:

• JAMB 2020

Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

A. 220\(^o\)
B. 200\(^o\)
C. 210\(^o\)
D. 180\(^o\)