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Current Electricity · Question 40

NEET (UG) 2019MCQMedium📈 Topic in 12% papers+4−1
1

In the circuits shown below, the readings of voltmeters and the ammeters will be : [figure]

  1. V1 = V2 and i1 = i2
  2. V1 > V2 and i1 > i2
  3. V1 > V2 and i1 = i2
  4. V1 = V2 and i1 > i2

Answer

(1) V1 = V2 and i1 = i2

Solution

Take the meters as ideal: an ideal voltmeter has infinite resistance and draws no current; an ideal ammeter has zero resistance.

Circuit 1: the voltmeter branch carries no current, so the whole current flows through the 10 resistor.

⇒ i1 = 10 V10 = 1 A and V1 = 1 10 = 10 V

Circuit 2: the branch with 10 and V2 in series also carries no current, so there is no potential drop across that 10 resistor.

⇒ i2 = 1010 = 1 A and V2 reads the full p.d. across the upper 10 resistor = 10 V

∴ V1 = V2 and i1 = i2

Answer: (1)

NEET (UG) 2019

Keep practising — Current Electricity

2

Which of the following acts as a circuit protection device?

  1. inductor
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  3. switch
  4. fuse
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3

A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10I. The value of n is

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  2. 11
  3. 20
  4. 9
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4

A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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5

A carbon resistor of (47 4.7) k is to be marked with rings of different colours for its identification. The colour code sequence will be

  1. Violet – Yellow – Orange – Silver
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NEET 2018
6

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length, its new resistance will be

  1. Rn
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  3. Rn2
  4. nR
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7

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  1. potential gradients
  2. a condition of no current flow through the galvanometer
  3. a combination of cells, galvanometer and resistances
  4. cells
NEET 2017
8

A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is

  1. 3 : 4
  2. 3 : 2
  3. 5 : 1
  4. 5 : 4
NEET 2016 (Phase 1)
9

The charge flowing through a resistance R varies with time t as Q = at - bt2, where a and b are positive constants. The total heat produced in R is

  1. a3R2b
  2. a3Rb
  3. a3R6b
  4. a3R3b
NEET 2016 (Phase 1)
10

The potential difference (VA - VB) between the points A and B in the given figure is [figure]

  1. -3 V
  2. +3 V
  3. +6 V
  4. +9 V
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11

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

  1. 230
  2. 46
  3. 26
  4. 13
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