Practice Test: Question Set - 01
1. Which of the following statement is true both for a series and a parallel D.C. circuit?
- (A) Elements have individual currents
- (B) Currents are additive
- (C) Voltages are additive
- (D) Power are additive
2. Insulating materials have the function of
- (A) Preventing a short circuit between conducting wires
- (B) Preventing an open circuit between the voltage
source and the load
- (C) Conducting very large currents
- (D) Storing very high currents
3. The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
- (A) Zero
- (B) Negative
- (C) Positive
- (D) About 2 ohms per degree
4. Resistance of a material always decreases if
- (A) Temperature of material is decreased
- (B) Temperature of material is increased
- (C) Number of free electrons available becomes more
- (D) None of the above is correct
5. 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
6. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be
- (A) 160 ohms
- (B) 80 ohms
- (C) 20 ohms
- (D) 10 ohms
7. Which of the following statement is correct?
- (A) A semiconductor is a material whose conductivity is
same as between that of a conductor and an insulator
- (B) A semiconductor is a material which has
conductivity having average value of conductivity of metal and insulator
- (C) A semiconductor is one which conducts only half of
the applied voltage
- (D) A semiconductor is a material made of alternate
layers of conducting material and insulator
8. Which of the following can have negative temperature coefficient?
- (A) Compounds of silver
- (B) Liquid metals
- (C) Metallic alloys
- (D) Electrolytes
9. An instrument which detects electric current is known as
- (A) Voltmeter
- (B) Rheostat
- (C) Watt-meter
- (D) Galvanometer
10. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be
- (A) 1 Q
- (B) 2 Q
- (C) 3 Q
- (D) 4 Q
11. Sparking occurs when a load is switched off because the circuit has high
- (A) Resistance
- (B) Inductance
- (C) Capacitance
- (D) Impedance
12. International ohm is defined in terms of the resistance of
- (A) A column of mercury
- (B) A cube of carbon
- (C) A cube of copper
- (D) The unit length of wire
13. An open resistor, when checked with an ohmmeter reads
- (A) Zero
- (B) Infinite
- (C) High but within tolerance
- (D) Low but not zero
14. The number of electrons in the outer most orbit of carbon atom is
- (A) 3
- (B) 4
- (C) 6
- (D) 7
15. A field of force can exist only between
- (A) Two molecules
- (B) Two ions
- (C) Two atoms
- (D) Two metal particles
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