Length
Area of cross-section
Temperature
Resistivity
Answer is Right!
Answer is Wrong!
Detailed SolutionThe resistance of a conductor varies inversely as
Current electricity
62. An open resistor, when checked with an ohmmeter reads
Zero
Infinite
High but within tolerance
Low but not zero
Answer is Right!
Answer is Wrong!
Detailed SolutionAn open resistor, when checked with an ohmmeter reads
63. In the case of direct current
Magnitude and direction of current remains constant
Magnitude and direction of current changes with time
Magnitude of current changes with time
Magnitude of current remains constant
Answer is Right!
Answer is Wrong!
64. What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal?
5 joules
10 joules
15 joules
20 joules
Answer is Right!
Answer is Wrong!
65. When current flows through heater coil it glows but supply wiring does not glow because
Current through supply line flows at slower speed
Supply wiring is covered with insulation layer
Resistance of heater coil is more than the supply wires
Supply wires are made of superior material
Answer is Right!
Answer is Wrong!
66. One Newton meter is same as
One watt
One joule
Five joules
One joule second
Answer is Right!
Answer is Wrong!
67. Sparking occurs when a load is switched off because the circuit has high
Resistance
Inductance
Capacitance
Impedance
Answer is Right!
Answer is Wrong!
Detailed SolutionSparking occurs when a load is switched off because the circuit has high
68. Which of the following statement is true both for a series and a parallel D.C. circuit?
Elements have individual currents
Currents are additive
circuit? A. Elements have individual currents B. Currents are additive C. Voltages are additive
Power are additive
Answer is Right!
Answer is Wrong!
69. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
The current through each bulb in same
The voltage across each bulb is not same
The power dissipation in each bulb is not same
None of the above
Answer is Right!
Answer is Wrong!
70. Two resistors are said to be connected in series when
Same current passes in turn through both
Both carry the same value of current
Total current equals the sum of branch currents
Sum of IR drops equals the applied e.m.f.
Answer is Right!
Answer is Wrong!
Detailed SolutionTwo resistors are said to be connected in series when