How many electrons should pass through the conductor in 1 sec to constitute 2 Ampere current? Given : Charge on electron=$1.6 \times 10^{-19}$ coulombs
  • $13 \times 10^{18}$
  • $4.5 \times 10^{18}$
  • $6.25 \times 10^{18}$
  • $12.5 \times 10^{18}$
A electric heater is rated at 200V-400W. What is the resistance of the heater
  • 200 ohm
  • 100 ohm
  • 400 ohm
  • 50 ohm
A potential difference of 100 Volt is applied across a resistor of resistance 10 ohm. Find the heat energy produced in 10 sec?
  • 10 kJ
  • 500 J
  • 1000 J
  • none of these
How many joules are there in one kilowatt-hour?
  • $3.6 \times 10^6$ J
  • $1.6 \times 10^6$ J
  • $3.6 \times 10^4$ J
  • None of these
What is the power of an electric lamp, if it draws 20 A current when connected to 220 V line?
  • 110 Watt
  • 240 Watt
  • 4400 Watt
  • none of these
A wire whose length L and area of cross-section A has R resistance. If the length of a wire is doubled, and its cross section is also doubled, then what will be its resistance?
  • R
  • 2R
  • R/2
  • 4R
Consider the following statements: A. In series connection, the same current flows through each element. B. In parallel connection, the same potential difference gets applied across each element
  • A is wrong but B is correct
  • A is correct but B is wrong
  • both A and B are correct
  • both A and B are wrong
On which of the following no ‘plus’ or ‘minus’ sign is marked?
  • an ammeter
  • a voltmeter
  • a resistor
  • a cell
A thick wire has a larger resistance than a thin wire.
  • True
  • False
A voltmeter is used to measure
  • electric power
  • potential difference
  • resistance
  • electric current
The free electrons of a metal are free to
  • are free to move anywhere in the metal
  • are free to escape through the surface
  • move on the surface only
  • are free to fall into the nuclei
It is not possible to have a particle with charge $20\times {{10}^{-19}}$ C.
  • True
  • False
A negative charge released from a point A moves along the line AB. The potential at A is 15 V, and it varies uniformly along AB. The potential at B
  • maybe 10 V
  • maybe 15 V
  • maybe 20 V
  • must be 15 V
Consider the following incomplete statement “Ohm’s law relates potential difference with . . . . . . . . . . for a given resistance”. The suitable choice for the missing word is
  • power
  • energy
  • current
  • time
If two equal resistances are connected in parallel, the equivalent resistance is halved.
  • True
  • False
An electron released from rest at a point P moves towards a nearby point Q. The potential at P is higher than the potential at Q.
  • True
  • False
0 h : 0 m : 1 s

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