Question 4291:

• WAEC 2021

The reason for laminating the soft iron core of a transformer is to?

A. Reduce eddy current.
B. Reduce magnetic flux.
C. Increase the magnetic flux.
D. Reduce its efficiency.

Question 4292:

• WAEC 2021

Formation of hydrogen bubbles at the copper plate of a primary cell is called?

A. Polarization.
B. Back e.m.f.
C. Electrolysis.
D. Local action.

Question 4293:

• WAEC 2021

Which of the following factors does not affect the rate of evaporation of a liquid?

A. Temperature
B. Volume
C. Wind
D. Surface area

Question 4294:

• WAEC 2021

Opening in the eye through which light passes to the retina is called the?

A. Pupil
B. Cornea.
C. Iris
D. Optic nerve.

Question 4295:

• WAEC 2021

A heat sensitive resistor made of a semiconductor is called?

A. Thermometer.
B. Thermostat.
C. Thermistor
D. Thermopile.