Post Utme Physics Past Questions and Answers

Question 141:

From the generating station to each sub-station, power is transmitted at a very high voltage so as to reduce ____________

A. Eddy current loss
B. Hysteresis loss
C. Heating in the cable
D. Magnetic flux leakage

Question 142:

Two tuning forks of frequencies \(256 \mathrm{~Hz}\) and \(260 \mathrm{~Hz}\) are sounded close to each other. What.is. the frequency of the beats produced?

A. \(516 \mathrm{~Hz}\)
B. \(258 \mathrm{~Hz}\)
C. \(4 \mathrm{~Hz}\)
D. \(300 \mathrm{~Hz}\)

Question 143:

The fundamental frequency of vibration of' a sonometer wire may be halved by ____________

A. Doubling the length of the wire
B. Doubling the mass of the wire
C. 240V
D. 60V

Question 144:

A transformer has a primary coil with 500 turns and a secondary coil with 2500 turns and a secondary coil with 2500 turns. When the voltage input to the primary is 120V, the output is ____________

A. 6000 V
B. 600 V
C. 240 V
D. 60 V

Question 145:

The principle of operation of an induction coil is based on ____________

A. Ohm's law
B. Ampere's law
C. Faraday's law
D. Coulomb's law