Question 4486:

• NECO 2003

Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the ___________

A. Breaking point
B. Elastic limit
C. Plastic limit
D. Stress limit
E. Yield point

Question 4487:

• NECO 2003

Which of the following instruments can be used to measure e.m.f. most accurately.

A. Ammeter
B. Galvanometer
C. Metre bridge
D. Potentiometer
E. Voltmeter

Question 4488:

• NECO 2003

Evaporation of a liquid produces cooling of the liquid because the ___________

A. Attraction between the vapour molecules and the liquid molecules is great
B. Average kinetic energy of the liquid is reduced
C. Density of the liquid decreases
D. Vapour pressure above the liquid rises
E. Volume of the liquid decreases

Question 4489:

• NECO 2003

Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

A. 2.0 × 10⁴J
B. 1.0 × 10⁴J
C. 5.0 × 10³J
D. 4.0 × 10³J
E. 2.0 × 10²J

Question 4490:

• NECO 2003

A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.

A. 0.53
B. 0.83
C. 1.20
D. 1.50
E. 1.88