Current Electricity (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 65 - 68 of 77

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Question number: 65

» Current Electricity » Kirchhoff's Laws

MCQ▾

Question

In the given circuit the current I 1 is

Circuit diagram consist of three resistor and two battery

Circuit Diagram Consist of Three Resistor and Two Battery

Here in figure 30Ω resistor connected in one branch, 40 Ω resistor and one battery connected in second branch and 40 Ω resistor and battery connected in third branch. And all three branches are parallel to each other. I1, I2 and I3 are the current passing through these branches respectively.

Choices

Choice (4) Response

a.

-0.4 A

b.

0.8 A

c.

-0.8 A

d.

0.4 A

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.

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

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