NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 750 - 753 of 2184

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Question number: 750

» Experimental Skills » Screw Gauge

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The center of mass of a system of n particles is the weighted average of the position vector of the n particles making up the system.

Reason (Ꭱ)

The position of the center of mass of a system is independent of coordinate system.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 751

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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Assertion-Reason▾

Question

Assertion (Ꭺ)

An electric motor will have maximum efficiency when back e. m. f. is equal to half of the applied e. m. f.

Reason (Ꭱ)

Efficiency of electric motor depends only on magnitude of back e. m. f.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 752

» Experimental Skills » Screw Gauge

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MCQ▾

Question

In the HCl molecule, the separation between the nuclei of the two atom is about 1.27 Å (1Å = 10 -10 m). The approximate location of the center of mass from the hydrogen atom, assuming the chlorine atom to be about 35.5 times massive as hydrogen is

Choices

Choice (4) Response

a.

l Å

b.

2.5 Å

c.

1.5 Å

d.

1.24 Å

Question number: 753

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

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MCQ▾

Question

5.5 x 10 -4 magnetic flux lines are passing through a coil of resistance 10 ohm and number of turns 1000. If the number of flux lines reduces to 5 x 10 -5 in 0.1 sec. Then

(1) The electromotive force induced in the coil is 5V

(2) The electromotive force induced in the coil is 5 x 10 -4 V

(3) The current induced in the coil is 0.5 A

(4) The current induced in the coil is 10 A

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1,2 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct