Basic Electrical - VII

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1.Electric pressure is also called

(a) resistance
(b) power
(c) voltage
(d) energy

Ans: a

2. In the case of direct current

(a) magnitude and direction of current remains constant
(b) magnitude and direction of current changes with time
(c) magnitude of current changes with time
(d) magnitude of current remains constant

Ans: a

3. Cells are connected in series in order to increase the

(a) current capacity
(b) life of the cells
(c) voltage rating
(d) terminal voltage

Ans: c

4. Heat in a conductor is produced on the passage of electric current due to

(a) reactance
(b) capacitance
(c) impedance
(d) resistance

Ans: d

5. The resistance of a conductor having length l area of cross section a and resistivity ρ is given

(a.) ρa/l
(b) ρl/a
(c) ρla
(d) l/ρ

Ans: b

6. If a wire conductor of 2 ohms resistance is doubled in length, its resistance becomes

(a) 4 ohms
(b) 6 ohms
(c) 8 ohms
(d) 10 ohms

Ans: a

7. Conductance : mho ::

(a) resistance : ohm
(b) capacitance : henry
(c) inductance : farad
(d) lumen : steradian

Ans: a

8. A capacitor consists of

(a) two insulators separated by a conductor
(b) two conductors separated by an insulator
(c) two insulators only
(d) two conductors only

Ans: b

9. Bulbs in street lighting are all connected in

(a) parallel
(b) series
(c) series-parallel
(d) end-to-end

Ans: a

10. Ohm's law is not applicable for

(a) semi-conductors
(b) D.C. circuits
(c) small resistors
(d) high currents

Ans: a

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