Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 69 - 74 of 124

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Question number: 69

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

A resistance of 20Ω is connected to a source of an alternating potential V = 220 sin (100πt). The time taken by the current to change from its peak value to r. m. s value is,

Choices

Choice (4) Response

a.

0.25 sec

b.

0.2 sec

c.

2.5 x 10 -3 sec

d.

25 x 10 -3 sec

Question number: 70

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

In an ac circuit . The time required for the current to achieve its peak value will be

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 71

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

In a circuit, the value of alternating current is measured by hot wire ammeter as 10 ampere. Its peak value will be

Choices

Choice (4) Response

a.

20 A

b.

14.14 A

c.

7.07 A

d.

10 A

Question number: 72

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

The peak value of an alternating e. m. f. E given by E = E 0 cos t is 10 volts and its frequency is 50 Hz. At time , the instantaneous e. m. f. is

Choices

Choice (4) Response

a.

1 V

b.

10 V

c.

5 V

d.

Question number: 73

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A transformer has turn ratio 100: 1. If secondary coil has 4 amp current then current in primary coil is

Choices

Choice (4) Response

a.

4 A

b.

0.04 A

c.

400 A

d.

0.4 A

Question number: 74

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An inductor (L = 100 mH), a resistor (R = 100Ω) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

Circuit diagram consist of inductor, resistor and battery

Circuit Diagram Consist of Inductor, Resistor and Battery

In figure inductor, resistor and battery connected in series.

Choices

Choice (4) Response

a.

1 A

b.

0.1 A

c.

e A

d.

f Page
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