NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 736 - 740 of 2142

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Question number: 736

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

In an L - R circuit, the value of L is Equation henry and the value of R is 30 ohm. If in the circuit, an alternating e. m. f. of 200 volt at 50 cycles per sec is connected, the impedance of the circuit and current will be

Choices

Choice (4) Response

a.

40.4 Ω, 5A

b.

30.7 Ω, 6.5A

c.

11.4Ω, 17.5A

d.

50 Ω, 4A

Question number: 737

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

In the circuit, E = 10 volt, R1 = 5.0 ohm, R 2 = 10 ohm and L = 5.0 henry. The current just after the switch S is pressed is.

 A diagram consists of resistors, inductor, switch and battery

a Diagram Consists of Resistors, Inductor, Switch and Battery

In figure, inductor L, and resistors R1 and R2 are connected with battery E and switch S.

Choices

Choice (4) Response

a.

3.0A

b.

5.0A

c.

2.0A

d.

6.0A

Passage

Read the passage given below and answer the questions that follow:

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg /k from natural length of spring and then released from rest. Neglect friction anywhere.

Block system with 2 blocks A and B

Block System With 2 Blocks a and B

In above figure we show that block A and B which connected with spring.

Question number: 738 (1 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

Question

Maximum extension in the spring after system loses contact with wall

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

None of the above

Question number: 739

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 740

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of Equation , when ac flows through an inductor.

Reason (Ꭱ)

The inductive reactance increases as the frequency of ac source decreases.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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