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