NEET Physics: Questions 1067 - 1070 of 2098

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Question number: 1067

» Ray Optics » Snell's Law

MCQ▾

Question

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 43 . A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball is, [g=10ms2]

Choices

Choice (4) Response

a.

21.33ms

b.

9ms

c.

12ms

d.

16ms

Question number: 1068

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

Assertion-Reason▾

Assertion (Ꭺ)

When capacitive reactance is smaller than the inductive reactance in LCR current, e. m. f. leads the current.

Reason (Ꭱ)

The phase angle is the angle between the alternating e. m. f. and alternating current of the circuit.

Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 1069

» Ray Optics » Deviation and Dispersion of Light by a Prism

Assertion-Reason▾

Assertion (Ꭺ)

A rainbow cannot be seen at noon, when the sun is high in the sky.

Reason (Ꭱ)

A rainbow is formed by dispersion of light.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 1070

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

Question

Calculate the dispersive power for crown glass from the (given data: μv=1.5230,μr=1.5145 )

Choices

Choice (4) Response

a.

0.0163

b.

0.0183

c.

0.0112

d.

0.0142

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