Jamb Physics 2017 Past Questions and Answers

Question 21:

• JAMB 2017

When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is

A. 240v
B. 340v
C. 480v
D. 57600v

Question 22:

• JAMB 2017

Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo

A. Number of turns in the coil is increased
B. Strength of the field magnet is increased
C. Slip rings are replaced with split ring cummutator
D. Coil is wound on a soft iron armature

Question 23:

• JAMB 2017

The net capacitance in the circuit above is

A. 80µF
B. 6.0µF
C. 4.0µF
D. 2.0µF

Question 24:

• JAMB 2017

The instrument used to measure the pressure of a gas is

A. Barometer
B. Thermometer
C. Hygrometer
D. Manometer

Question 25:

• JAMB 2017

A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms\(^{-2}\) the power expended is

A. 100w
B. 200w
C. 400w
D. 500w