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Quiz 1
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Unit of electric power may also be expressed as
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volt ampere
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kilowatt hour
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watt second
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Joule second
Explanation
volt ampere
Electrical resistivity of a given metallic wire depends upon
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its length
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its thickness
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its shape
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nature of the material
Explanation
nature of the material
A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure (i), (ii) and (iii). The current recorded in the ammeter will be
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maximum in (i)
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maximum in (ii)
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maximum in (iii)
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the same in all the cases
Explanation
the same in all the cases
The unit of e. m. f. of a cell is
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dyne
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volt
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ampere
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joule
Explanation
volt
Kilowatt hour is the unit of
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power
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energy
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impulse
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force
Explanation
energy
1 kWh is equal to
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3. 6 × 10
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3. 6 × 10
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3. 6 × 10² MJ
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3. 6 MJ
Explanation
3. 6 MJ
Materials which allow larger currents to flow through them are called
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insulators
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conductors
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semiconductors
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alloys
Explanation
conductors
Conventionally, the direction of the current is taken as
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the direction of flow of negative charge
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the direction of flow of atoms
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the direction of flow of molecules
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the direction of flow of positive charge
Explanation
the direction of flow of positive charge
The unit of specific resistance is
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ohm
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ohm
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ohm-metre
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ohm per metre
Explanation
ohm-metre
The slope of voltage (V) versus current (I) is called
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resistance
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conductance
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resistivity
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conductivity
Explanation
resistance
The variable resistance is called
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resistor
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rheostat
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open switch
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none of these
Explanation
rheostat
The SI unit of resistance is
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ohm m
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ohm m
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ohm
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(ohm)
Explanation
ohm
An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be
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1000 Ω
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55 Ω
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44 Ω
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None of these
Explanation
55 Ω
The element used almost exclusively for filaments of incandescent lamps
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copper
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gold
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silver
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tungsten
Explanation
tungsten
Which of the following is not correct about electrical circuit?
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Ammeter is connected with series
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Voltmeter is connected in parallel
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Electric current is the flow of electrons in the metal wire
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None of these
The resistivity of a substance does not depend upon?
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Length or thickness of the material
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Nature of the material
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Temperature of the material
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None of these
There are two statements Statement A Formula for Power is $P=VI$ Statement B Formula for Power is $P=I^2R$ Which one of the following is correct?
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A only
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B only
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Both A and B are correct
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Both A and B are incorrect
You are given three resistances of 2,4 and 6 ohm. What will be the equivalent resistance if they are connected in series
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6 ohm
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1.2 ohm
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12 ohm
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2 ohm
What will be the equivalent resistance if they are connected in parallel ?
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5 ohm
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1.2 ohm
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12 ohm
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1.09 ohm
what should be arrangement of the three resistors to get 5.5 ohm as equivalent resistance?
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2,4,6 are in parallel
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2 and 4 ohm resistor in parallel with 6 ohm in series
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2 and 6 ohm resistor in parallel with 4 ohm in series
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4 and 6 ohm resistor in parallel with 2 ohm in series
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