NEET Physics: Questions 1015 - 1019 of 2142

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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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1016

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

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

Equation . 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

Question number: 1018

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Electromagnetic waves travel in a medium with a speed of 2 x 10 8 m/s. The relative permeability of the medium is 1. What is the relative permittivity of the medium?

Choices

Choice (4) Response

a.

-0.25

b.

2.25

c.

3.25

d.

1.25

Question number: 1019

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

Assertion-Reason▾

Assertion (Ꭺ)

By increasing the diameter of the objective of telescope, we can increase its range.

Reason (Ꭱ)

The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

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.

Both Ꭺ and Ꭱ are false

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