NEET Physics: Questions 1015 - 1019 of 2098

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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.

B

b.

E×B

c.

E

d.

B×E

Question number: 1016

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

In an ac circuit, V and I are given by V=100sin(100t)volt ,

I=sin(100t+π3)mA . 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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