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Current Electricity · Question 17

NEET (UG) 2023MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(1) 0.5 A from A to B through E

Solution

The positive (long-plate) terminals of the 10 V and 5 V cells both face E, so the cells oppose each other.

Net emf = 10 - 5 = 5 V, acting in the direction of the 10 V cell.

Total resistance = 2 + 1 + 7 = 10

I = 510 = 0.5 A

The 10 V cell drives current out of its + terminal towards E, i.e. from A to B through E (and back through C, D).

Answer: (1)

NEET (UG) 2023

Keep practising — Current Electricity

2

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
3

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
NEET (UG) 2023
4

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
NEET (UG) 2023
5

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
6

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
7

Two resistors of resistance, 100 and 200 are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 to that in 200 in a given time is

  1. 1 : 2
  2. 2 : 1
  3. 1 : 4
  4. 4 : 1
NEET (UG) 2022
8

A copper wire of length 10 m and radius ( 10-2 ) m has electrical resistance of 10 . The current density in the wire for an electric field strength of 10 (V/m) is

  1. 104 A/m2
  2. 106 A/m2
  3. 10-5 A/m2
  4. 105 A/m2
NEET (UG) 2022
9

A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q [figure]

  1. Should be approximately equal to 2X
  2. Should be approximately equal and are small
  3. Should be very large and unequal
  4. Do not play any significant role
NEET (UG) 2022
10

The reciprocal of resistance is :

  1. conductance
  2. reactance
  3. mobility
  4. conductivity
NEET (UG) 2022 (Phase 2)
11

A cell of emf 4 V and internal resistance 0.5 is connected to a 7.5 external resistance. The terminal potential difference of the cell is

  1. 0.375 V
  2. 3.75 V
  3. 4.25 V
  4. 4 V
NEET (UG) 2022 (Phase 2)

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