NEET Physics: Questions 692 - 695 of 2099

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Question number: 692

» Experimental Skills » Screw Gauge

MCQ▾

Question

The velocities of three particles of masses 10g, 10g and 30g are 10i, 10j and 10k respectively. The velocity of the center of mass of the three particles is

Choices

Choice (4) Response
a.

20i^+30j^+5k^

b.

10i^+10j^+10k^

c.

2i^+2j^+6k^

d.

2i^+3j^+5k^

Question number: 693

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Assertion-Reason▾

Assertion (Ꭺ)

Soft iron is used as a core of transformer.

Reason (Ꭱ)

Area of hysteresis loop for soft iron is small.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is true but Ꭱ is 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: 694

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A closed coil of copper whose area is lm × lm is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of 0.10 Wb/m 2. It is rotated through 180° in 0.01 second. Then (The resistance of the coil is 2.0Ω)

(1) The induced e. m. f. in the coil is 20 V

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

(3) The induced e. m. f. in the coil is 10 V

(4) The induced current in the coil is 20 A

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

Choices

Choice (4) Response
a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 695

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Assertion-Reason▾

Assertion (Ꭺ)

Lenz’s law violates the principle of conservation of energy.

Reason (Ꭱ)

Induced e. m. f. opposes the change in magnetic flux responsible for its production.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
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

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