NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 741 - 744 of 2184

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Question number: 741

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of , 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 and Ꭱ is the correct explanation of Ꭺ

Question number: 742

» Experimental Skills » Vernier Callipers

Edit
MCQ▾

Question

A 2 kg body and a 3 kg body are moving along the x-axis. At a particular instant the 2 kg body has a velocity of 3 ms -1 and the 3 kg body has the velocity of 2ms -1. The velocity of the center of mass at that instant is

Choices

Choice (4) Response

a.

5 ms -1

b.

0

c.

1 ms -1

d.

None of the above

Question number: 743

» Experimental Skills » Vernier Callipers

Edit
MCQ▾

Question

The center of mass of a triangle shown in figure has coordinates

Triangle with height h and width b

Triangle with Height H and Width B

Here in above figure we shows that center of mass of triangle

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 744

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Edit
MCQ▾

Question

Large transformer, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to

(1) Heating effect of current

(2) Hysteresis loss

(3) Chemical effect of current

(4) Magnetic effect of current

Select the correct answers and mark it according to the following

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