Current Electricity (NEET Physics): Questions 57 - 61 of 75

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Question number: 57

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

How can we convert the galvanometer of Rg=12Ω and current Ig=3mA into Ammeter with maximum range of 6A.

Choices

Choice (4) Response
a.

By adding a resistance 2.5mΩ in series with the galvanometer

b.

By adding a resistance 6mΩ in series with the galvanometer

c.

By adding a resistance 6mΩ . in parallel with the galvanometer

d.

By adding a resistance 2.5mΩ in parallel with the galvanometer

Question number: 58

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

A heater coil connected to a supply of a 220 F is dissipating some power P 1. The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power P 2. The ratio of power P 1: P 2 is

Choices

Choice (4) Response
a.

1: 4

b.

1: 2

c.

2: 1

d.

4: 1

Question number: 59

» Current Electricity » Wheatstone Bridge

MCQ▾

Question

In the circuit shown in the figure, the current flowing in 2Ω, resistance

 Bridge circuit consists of four resistors and a galvanometer.

Bridge Circuit Consists of Four Resistors and a Galvanometer.

Figure shows the bridge circuit with 10Ω, 2 Ω, 5 Ω and 25 Ω resistors. Current of 1.4 A is passing in circuit.

Choices

Choice (4) Response
a.

1.0A

b.

1.2 A

c.

1.4A

d.

0.4 A

Question number: 60

» Current Electricity » Wheatstone Bridge

MCQ▾

Question

In the figure, the equivalent resistance between A and B is-

 Circuit diagram with eight equal resistors R

Circuit Diagram With Eight Equal Resistors R

In circuit eight equal resistors R are connected between A and B.

Choices

Choice (4) Response
a.

3R

b.

R3

c.

2R3

d.

R

Question number: 61

» Current Electricity » Potentiometer

MCQ▾

Question

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10 -7 ohm-meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10 -6 m 2. The potential gradient along the potentiometer wire is

Choices

Choice (4) Response
a.

10 -8 V/m

b.

10 -2 V/m

c.

10 -4 V/m

d.

10 -6 V/m

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