The magnitude of voltage on the conductor
The magnitude of current flowing through it
Both (A) and (B)
None of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionThe thickness of insulation provided on the conductor depends on
Current electricity
52. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
Arcs across separating contacts
Mechanical noise of high intensity
Both mechanical noise and arc between contacts
None of the above
Answer is Right!
Answer is Wrong!
53. When electric current passes through a metallic conductor, its temperature rises. This is due to
Collisions between conduction electrons and atoms
The release of conduction electrons from parent atoms
Mutual collisions between metal atoms
Mutual collisions between conducting electrons
Answer is Right!
Answer is Wrong!
54. Nichrome wire is an alloy of
Lead and zinc
Chromium and vanadium
Nickel and chromium
Copper and silver
Answer is Right!
Answer is Wrong!
55. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
$$ rac{3}{2}Omega $$
6 $$Omega $$
4 $$Omega $$
$$ rac{8}{3}Omega $$
Answer is Right!
Answer is Wrong!
56. The number of electrons in the outer most orbit of carbon atom is
3
4
6
7
Answer is Right!
Answer is Wrong!
Detailed SolutionThe number of electrons in the outer most orbit of carbon atom is
57. Ohm’s law is not applicable to
Semiconductors
D.
circuits C. Small resistors
High currents
Answer is Right!
Answer is Wrong!
58. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
10 W
20 W
40 W
60 W
Answer is Right!
Answer is Wrong!
59. Conductance is reciprocal of
Resistance
Inductance
Reluctance
Capacitance
Answer is Right!
Answer is Wrong!
60. Which of the following materials has a negative temperature coefficient of resistance?
Copper
Aluminum
Carbon
Brass
Answer is Right!
Answer is Wrong!