NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1421 - 1425 of 2142

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Passage

Read the passage given below and answer the questions that follow:

In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as Equation . Here n 0 and k are positive constants. Position of any point P on screen is measure by its -coordinate as shown.

Young’s double slit experiment

Young’S Double Slit Experiment

In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as n = n0 + kt.

Question number: 1421 (2 of 3 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

If a glass plate of small thickness b is placed in front of S 1. How should its refractive index vary with time so that a central maximum is formed at O?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1422 (3 of 3 Based on Passage) Show Passage

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

The velocity of central maxima at any time t as a function of time t is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1423

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

When a hydrogen atom is raised from the ground state to an excited state

Choices

Choice (4) Response

a.

P. E. increases and K. E. decreases

b.

kinetic energy and potential energy increase

c.

K. E. and P. E. decrease

d.

P. E. decreases and K. E. increases

Question number: 1424

» Properties of Solids & Liquids » Latent Heat

MCQ▾

Question

A bullet moving with a uniform velocity v, stops sudden after hitting the target and the whole mass melts be m, specific heat S, initial temperature 25°C, melting point 475 °C and the latent heat L. Then v is given by

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation Equation

d.

Equation

Question number: 1425

» Wave Optics » Polarization

Assertion-Reason▾

Assertion (Ꭺ)

The unpolarised light and polarised light can be distinguished from each other by using polaroid.

Reason (Ꭱ)

A polaroid is capable of producing plane polarised beams of light.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

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

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