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Quiz 2
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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
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$13 \times 10^{18}$
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$4.5 \times 10^{18}$
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$6.25 \times 10^{18}$
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$12.5 \times 10^{18}$
A electric heater is rated at 200V-400W. What is the resistance of the heater
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200 ohm
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100 ohm
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400 ohm
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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?
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10 kJ
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500 J
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1000 J
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none of these
How many joules are there in one kilowatt-hour?
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$3.6 \times 10^6$ J
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$1.6 \times 10^6$ J
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$3.6 \times 10^4$ J
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None of these
What is the power of an electric lamp, if it draws 20 A current when connected to 220 V line?
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110 Watt
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240 Watt
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4400 Watt
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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?
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R
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2R
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R/2
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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
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A is wrong but B is correct
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A is correct but B is wrong
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both A and B are correct
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both A and B are wrong
On which of the following no ‘plus’ or ‘minus’ sign is marked?
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an ammeter
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a voltmeter
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a resistor
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a cell
A thick wire has a larger resistance than a thin wire.
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True
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False
A voltmeter is used to measure
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electric power
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potential difference
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resistance
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electric current
The free electrons of a metal are free to
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are free to move anywhere in the metal
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are free to escape through the surface
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move on the surface only
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are free to fall into the nuclei
It is not possible to have a particle with charge $20\times {{10}^{-19}}$ C.
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True
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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
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maybe 10 V
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maybe 15 V
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maybe 20 V
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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
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power
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energy
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current
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time
If two equal resistances are connected in parallel, the equivalent resistance is halved.
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True
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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.
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True
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False
0 h : 0 m : 1 s
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