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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