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Current Electricity

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

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)

Keep practising — Current Electricity

Ques. 2NEET (UG) 2019

Which of the following acts as a circuit protection device?

  1. inductor
  2. conductor
  3. switch
  4. fuse
Ques. 3NEET 2018

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

  1. 10
  2. 11
  3. 20
  4. 9
Ques. 4NEET 2018

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]
Ques. 5NEET 2018

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
  2. Yellow – Violet – Orange – Silver
  3. Yellow – Green – Violet – Gold
  4. Green – Orange – Violet – Gold
Ques. 6NEET 2017

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
  2. n2R
  3. Rn2
  4. nR
Ques. 7NEET 2017

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

  1. potential gradients
  2. a condition of no current flow through the galvanometer
  3. a combination of cells, galvanometer and resistances
  4. cells
Ques. 8NEET 2016 (Phase 1)

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
Ques. 9NEET 2016 (Phase 1)

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
Ques. 10NEET 2016 (Phase 2)

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
Ques. 11NEET 2016 (Phase 2)

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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