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Current Electricity · Question 12

NEET (UG) 2024MCQMedium📈 Topic in 62% papers+4−1
1

Choose the correct circuit which can achieve the bridge balance.

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

Answer

(1) [figure]

Solution

Bridge balance (no current through G): PQ = RS

Upper arms: P = 10 , Q = 10 ; lower arms: R = 15 , S = 5 + RD (diode in series).

1010 = 155 + RD

RD = 10

So the bridge balances only if the diode conducts (forward biased) and offers its forward resistance RD = 10 ; a reverse-biased diode (infinite resistance) or a shorted 5 arm can never balance it.

(1) Long plate (+) on the left: current enters at the left junction and leaves at D; the diode points towards D forward biased balance possible.

(2) Diode points away from D reverse biased.

(3) Diode across the 5 resistor S cannot reach 15 .

(4) Cell reversed diode reverse biased.

Answer: (1)

NEET (UG) 2024

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2

A uniform wire of diameter d carries a current of 100 mA when the mean drift velocity of electrons in the wire is v. For a wire of diameter d2 of the same material to carry a current of 200 mA, the mean drift velocity of electrons in the wire is

  1. 4v
  2. 8v
  3. v
  4. 2v
RE-NEET (UG) 2024
3

A uniform metal wire of length l has 10 resistance. Now this wire is stretched to a length 2l and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is

  1. 10
  2. 5
  3. 40
  4. 20
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4

The given circuit shows a uniform straight wire AB of 40 cm length fixed at both ends. In order to get zero reading in the galvanometer G, the free end of J is to be placed from B at: [figure]

  1. 32 cm
  2. 8 cm
  3. 16 cm
  4. 24 cm
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5

The steady state current in the circuit shown below is : [figure]

  1. 0.67 A
  2. 1.5 A
  3. 2 A
  4. 1 A
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6

The magnitude and direction of the current in the following circuit is :- [figure]

  1. 0.5 A from A to B through E
  2. 59 A from A to B through E
  3. 1.5 A from B to A through E
  4. 0.2 A from B to A through E
NEET (UG) 2023
7

If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by: [figure]

  1. 50
  2. 100
  3. 400
  4. 200
NEET (UG) 2023
8

Resistance of a carbon resistor determined from colour codes is (22000 5\%) . The colour of third band must be :

  1. Green
  2. Orange
  3. Yellow
  4. Red
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9

The resistance of platinum wire at 0 is 2 and 6.8 at 80 . The temperature coefficient of resistance of the wire is :

  1. 3 10-3 -1
  2. 3 10-2 -1
  3. 3 10-10 -1
  4. 3 10-4 -1
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10

10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased n times. The value of n is :

  1. 100
  2. 1
  3. 1000
  4. 10
NEET (UG) 2023
11

As the temperature increases, the electrical resistance

  1. Increases for both conductors and semiconductors
  2. Decreases for both conductors and semiconductors
  3. Increases for conductors but decreases for semiconductors
  4. Decreases for conductors but increases for semiconductors
NEET (UG) 2022

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