NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1013 - 1017 of 2142

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Question number: 1013

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

An alternating current is more dangerous than the direct steady current.

Reason (Ꭱ)

The frequency of the alternating current is injurious the human body.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

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

Question number: 1014

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

A completely transparent material will be invisible in vacuum if its refractive index is,

Choices

Choice (4) Response

a.

Unity

b.

Equal to1.33

c.

Greater than unity

d.

Less than unity

Question number: 1015

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If E and B be the electric and magnetic field of E. M. wave then the direction of propagation of E. M. wave is along the direction.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1016

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

In an ac circuit, V and I are given by ,

. The average power dissipated in circuit is

Choices

Choice (4) Response

a.

2.5 watt

b.

10 4 watt

c.

10 watt

d.

0.025 watt

Question number: 1017

» Ray Optics » Snell's Law

MCQ▾

Question

Light from a sodium lamp (λ 0 = 589 nm) passes through a tank of glycerin (refractive index 1.47) 20 m long in a time t 1. If it takes a time to traverse the same tank when filled with carbon disulphide (index 1.63), then the difference t 2 - t 1 is,

Choices

Choice (4) Response

a.

6.67 × 10 -8 sec

b.

2.07 × 10 -7 sec

c.

1.09 × 10 -7 sec

d.

1.07 × 10 -8 sec

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