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A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process?

a.

30 minutes

b.

5 minutes

c.

50 minutes

d.

60 minutes

In which of the following situations is photoelectric effect employed?

I. Automatic devices for switching on light at dusk
II. Automatic doors in departmental stores
III. Automatic devices for switching stores
IV. Automatic voltage stabilization

a.

I, II and IV only

b.

I, II and IV only

c.

III, IV only

d.

I and II only

Which of the following statements is not an advantage of an alkaline accumulator?

a.

The electrolyte does not need attention

b.

It can be recharged

c.

It has low internal resistance

d.

It has a much longer life than lead-acid accumulator

To protect a material from the influence of an external magnetic field, the material should be kept in a

a.

soft iron ring

b.

loop of copper wire

c.

triangular zinc ring

d.

square steel ring

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