Multiple Choice and Answers on Current Electricity - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. Two resistors are said to be connected in series when
(A) Same current passes in turn through both
(B) Both carry the same value of current
(C) Total current equals the sum of branch currents
(D) Sum of IR drops equals the applied e.m.f.

2. Varistors are
(A) Insulators
(B) Nonlinear resistors
(C) Carbon resistors
(D) Resistors with zero temperature coefficients

3. If a parallel circuit is opened in the main line, the current
(A) Increases in the branch of the lowest resistance
(B) Increases in each branch
(C) Is zero in all branches
(D) Is zero in the highest resistive branch

4. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains
(A) Length of heating element should be decreased
(B) Length of heating element should be increased
(C) Length of heating element has no effect on heating if water
(D) None of the above

5. It becomes more difficult to remove
(A) Any electron from the orbit
(B) First electron from the orbit
(C) Second electron from the orbit
(D) Third electron from the orbit

6. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
(A) Arcs across separating contacts
(B) Mechanical noise of high intensity
(C) Both mechanical noise and arc between contacts
(D) None of the above

7. Ohm's law is not applicable to
(A) Semiconductors
(B) D.C. circuits
(C) Small resistors
(D) High currents

8. Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
(A) Varistors
(B) Thermistor
(C) Semiconductors
(D) Variable resistors

9. A thermistor has
(A) Positive temperature coefficient
(B) Negative temperature coefficient
(C) Zero temperature coefficient
(D) Variable temperature coefficient

10. The substances which have a large number of free electrons and offer a low resistance are called
(A) Insulators
(B) Inductors
(C) Semiconductors
(D) Conductors

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