Electromagnetic Induction & Alternating Currents (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 19 - 24 of 124

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Question number: 19

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is

Choices

Choice (4) Response

a.

4.55 amp

b.

3.55 amp

c.

0.355 amp

d.

0.455 amp

Question number: 20

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

The instantaneous value of current in an A. C. circuit is Equation . The current will be maximum for the first time at,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 21

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track? Given that - the horizontal component of earth’s magnetic field B H is 0.2 x 10 -4 Wb/m 2 and rails are separated by 1 meter.

Choices

Choice (4) Response

a.

1 V

b.

10 mV

c.

l mV

d.

100 mV

Question number: 22

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

The frequency of ac mains in India is

Choices

Choice (4) Response

a.

50 c/s or Hz

b.

30 c/s or Hz

c.

120 c/s or Hz

d.

60 c/s or Hz

Question number: 23

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A step up transformer has transformation ratio 5: 3. What is voltage in secondary if voltage in primary is 60 V.

Choices

Choice (4) Response

a.

180 V

b.

20 V

c.

100 V

d.

60 V

Question number: 24

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

Three inductances are connected as shown below. Assuming no coupling, the resultant inductance will be- (L 1 = 0.75 H, L 2 = L 3 = 0.5 H)

Three inductances connected in circuit

Three Inductances Connected in Circuit

In figure three inductances are connected. L2 and L3 are in parallel and L1 connected in series with them.

Choices

Choice (4) Response

a.

0.75 H

b.

0.01 H

c.

0.25 H

d.

1 H

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