SAT - Science - Physics - Current Electricity

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Question - 1

If R1 and R2 are respectively the filament resistances of a 200w bulb and a 100w bulb designed to operate on the same voltage.

  • A R1 is two times R2
  • B R2 is two times R1
  • C R1 is four times R2
  • D R2 is four times R1

Question - 2

Total number of electrons present in 4 A current flowing for Is is

  • A \(1.25\times10^{23}\)
  • B \(25\times10^{20}\)
  • C \(6\times10^{8}\)
  • D \(2.5\times10^{19}\)

Question - 3

The current in the branch CDin the circuit shown below will be

  • A I1+I2
  • B I1+I3
  • C I2+I3
  • D I1-I3

Question - 4

The resistance of a metallic wire becomes 8 times when

  • A length is doubled
  • B length is tripled
  • C length is doubled and radius is halved
  • D length is halved and radius is doubled

Question - 5

In the following figure the current through 4Ω resistor is

  • A 1.4 A
  • B 0.4 A
  • C 0.7 A
  • D 1.0 A

Question - 6

Five identical lamps, each of resistance 1100 Ω are connected to 200 V as shown in the following figure. The reading of an ideal ammeter A is

  • A \(\frac{250}{1100} \times 5A\)
  • B \(\frac{220}{110} \times1A\)
  • C \(\frac{220}{1100} \times 3A\)
  • D \(\frac{220}{1100} \times 2A\)

Question - 7

The plot represents the flow of current through a wire at 3 different times. The ratio of charges flowing through the wire at different times is

  • A 2:1:2
  • B 1: 3: 3
  • C 1: 1: 1
  • D 2:3:4

Question - 8

Electric intensity is

  • A scalar
  • B vector
  • C neither scalar nor vector
  • D sometimes scalar and sometimes vector

Question - 9

In Coulomb's law, the constant of proportionality K has units

  • A Nm
  • B N
  • C Nm2/C2
  • D NC/m

Question - 10

The masses arid lengths of 3 wires of copper are in the ratio 1 : 3 : 5 and 5 : 3 : 1 respectively. The ratio of electrical resistance is

  • A 1 : 3 : 5
  • B 5 : 3 : 1
  • C 125:15:1
  • D 1: 125 : 15
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