NEET Physics: Questions 719 - 721 of 2142

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Question number: 719

» Experimental Skills » Screw Gauge

MCQ▾

Question

The two particles X and Y, initially at rest, start moving towards each other under mutual attraction. If at any instant the velocity of X is V and that of Y is 2V, the velocity of their center of mass will be 3

Choices

Choice (4) Response

a.

0

b.

V

c.

V/2

d.

2V

Question number: 720

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current?

Graph of V→t (as cos function)

Graph of v→T (As Cos Function)

Here in figure voltage across a pure inductor is represented.

Choices

Choice (4) Response

a.

Diagram of current vs time (choice A)

Diagram of Current vs Time (Choice A)

In figure current i→t (time) graph is indicate.

b.

Diagram of current vs time (Choice B)

Diagram of Current vs Time (Choice B)

In figure current i→t (time) graph is indicate.

c.

Diagram of current vs time (Choice C)

Diagram of Current vs Time (Choice C)

In figure current i→t (time) graph is indicate.

d.

Diagram of current vs time (Choice D)

Diagram of Current vs Time (Choice D)

In figure current i→t (time) graph is indicate.

Question number: 721

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

MCQ▾

Question

If an alternating voltage is represented as E = 141 sin (628t), then

(1) The rms voltage is 141V

(2) The rms voltage is 100V

(3) The frequency is 50 Hz

(4) The frequency is 100 Hz

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

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