Current Electricity (NEET Physics): Questions 66 - 70 of 75

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Question number: 66

» Current Electricity » Potentiometer

MCQ▾

Question

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length becomes 120 cm. The internal resistance of the cell is

Choices

Choice (4) Response

a.

1 Ω

b.

4 Ω

c.

2 Ω

d.

0.5 Ω

Question number: 67

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is R, then the effective resistance between the two diagonal ends would be

Cube made by twelve wires of equal and same cross-section area.

Cube Made by Twelve Wires of Equal and Same Cross-Section Area.

Twelve wires of equal length and same cross-section are connected in the form of a cube. The resistance of each wires is R.

Choices

Choice (4) Response

a.

2 R

b.

12 R

c.

56 R

d.

8 R

Question number: 68

» Current Electricity » Potentiometer

MCQ▾

Question

A Potentiometer wire of length 1 m is connected in series with 490 Ω resistance and 2V battery. If 0.2mV/cm is the potential gradient, then resistance of the potentiometer wire is

Choices

Choice (4) Response

a.

6.9 Ω

b.

5.9 Ω

c.

4.9 Ω

d.

7.9 Ω

Question number: 69

» Current Electricity » Electrical Resistance

MCQ▾

Question

The current in the given circuit will be

 Circuit Diagram with equal 30Ω resistance

Circuit Diagram With Equal 30Ω Resistance

Here three equal resistor of 30 Ω connected with 2 V battery as shown in figure.

Choices

Choice (4) Response

a.

15A

b.

110A

c.

145A

d.

115A

Question number: 70

» Current Electricity » Electrical Resistance

MCQ▾

Question

A cylindrical wire is stretched to increase its length by 10%. The percentage increase in the resistance of the wire will be

Choices

Choice (4) Response

a.

22%

b.

21%

c.

24%

d.

20%

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