The speed at which tjie current travels in a conductor is nearly:
  • 3 × 104 ms-1
  • 3 × 106 ms-1
  • 3 × 108 ms-1
  • 3 × 1010 ms-1
The resistance of a human body is about:
  • 12 Ω
  • 120 Ω
  • 12 KΩ
  • 120 MΩ
The number of electrons that constitute 1 A of current is:
  • 6.25 × 1016
  • 6.25 × 1017
  • 6.25 × 1018
  • 6.25 × 1019
How many different resistances are possible with two equal resistors?
  • 2
  • 3
  • 4
  • 5
Given three equal resistors, how many different combinations (taken all of them together) can be made?
  • 3
  • 4
  • 5
  • 6
Specific resistance of ali metals is mostly affected by:
  • temperature
  • pressure
  • magnetic field
  • volume
The example of a non-ohmic resistance is:
  • copper wire
  • fi lament lamp
  • carbon resistor
  • diode
If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be :
  • L, 2A
  • \(\frac{L}{2}\), 2A
  • 2L, 2A
  • 2l, \(\frac{A}{2\)
The specific resistance of a rod of copper as compared to that of thin wire of copper is :
  • less
  • more
  • same
  • depends upon the length and area of cross-section of the wire
A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
  • \(\frac{2}{3}\) Ω
  • \(\frac{3}{2}\) Ω
  • \(\frac{1}{2}\) Ω
  • \(\frac{1}{3}\) Ω
The length of a conductor is halved. Its resistance will be :
  • halved
  • doubled
  • unchanged
  • quadrupled
In the above question, the conductance:
  • halved
  • doubled
  • unchanged
  • quadrupled
Siemen is the unit of:
  • resistance
  • conductance
  • specific conductance
  • None of these
How much electric energy is consumed by a 100 W lamp used for 6 hours everyday for 30 days?
  • 18 kJ
  • 18 kWh
  • 1.8 J
  • None of these
Suppose H1 is the heat generated per second in the filament of a 100 W, 250 V lamp and H2 is the heat generated in the filament of a 200 W, 250 V lamp. Then H1/H2 is equal to:
  • 1
  • 2
  • \(\frac{1}{2}\)
  • \(\frac{1}{4}\)
Two wires of copper are of the same length but'have different diameters. When they are connected in series across a battery, the heat generated is H1 When connected in parallel across the same battery, the heat generated during the same time is H2 Then :
  • H1 = H2
  • H1 < H2
  • H1 > H2
  • H1 > H2
Kirchhoffs first and second laws for electrical circuits are consequences of:
  • conservation of energy
  • conservation of electrical charge and energy respectively
  • conservation of electric charge
  • neither conservation of energy nor electric charge
A 5 A fuse wire can with stand a maximum power of 1 W in circuit. The resistance of the fuse wire is:
  • 0.2 Ω
  • 5 Ω
  • 0.4 Ω
  • 0.04 Ω
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
  • resistance will be doubled and specific resistance will be halved
  • resistance will be halved and specific resistance will remain uncharged
  • resistance will be halved and the specific resistance will be doubled
  • resistance and specific resistance will both remain uncharged
A galvanometer acting as a volt meter will have with its coil.
  • a high resistance in parallel
  • a high resistance in series
  • a low resistance in parallel
  • a low resistance in series
0 h : 0 m : 1 s

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