NEET Physics: Questions 750 - 752 of 2099

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Question number: 750

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Assertion-Reason▾

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. Both Ꭺ and Ꭱ are false
b. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Ꭺ is true but Ꭱ is false

Question number: 751

» Experimental Skills » Screw Gauge

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.

1.24 Å

d.

1.5 Å

Question number: 752

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

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.

2 and 4 are correct

d.

1 and 2 are correct

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