Practice Test: Question Set - 04
1. When electric current passes through a metallic conductor, its temperature rises. This is due to
- (A) Collisions between conduction electrons and atoms
- (B) The release of conduction electrons from parent
atoms
- (C) Mutual collisions between metal atoms
- (D) Mutual collisions between conducting electrons
2. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
- (A) 100 W lamp will glow brighter
- (B) 40 W lamp will glow brighter
- (C) Both lamps will glow equally bright
- (D) 40 W lamp will fuse
3. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
- (A) Decrease
- (B) Increase
- (C) Remain constant
- (D) None of the above
4. Temperature coefficient of resistance is expressed in terms of
- (A) ohms/°C
- (B) mhos/ohm°C
- (C) ohms/ohm°C
- (D) mhos/°C
5. Voltage dependent resistors are usually made from
- (A) Charcoal
- (B) Silicon carbide
- (C) Nichrome
- (D) Graphite
6. Conductance: mho ::
- (A) Resistance : ohm
- (B) Capacitance : Henry
- (C) Inductance : farad
- (D) lumen : steradian
7. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open
- (A) There will be heavy current in the main line
- (B) Rest of the two bulbs will not light
- (C) All three bulbs will light
- (D) The other two bulbs will light
8. The S.I. unit of power is
- (A) Henry
- (B) Coulomb
- (C) Watt
- (D) Watt-hour
9. The resistance of a conductor varies inversely as
- (A) Length
- (B) Area of cross-section
- (C) Temperature
- (D) Resistivity
10. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
- (A) 33 V
- (B) 66 V
- (C) 80 V
- (D) 132 V
0 blogger:
Post a Comment