NEST (National Entrance Screening Test) Physics: Questions 40 - 42 of 58

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Question number: 40

» Wave Optics » Interference

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Appeared in Year: 2015

MCQ▾

Question

Two coherent monochromatic light beam of intensities and interfere in a Young’s double slit experimental setup to produce a fringe pattern on the screen. The phase difference between the beams at two points and on the screen at and , respectively. Then the ratio of the two intensities is –

Choices

Choice (4) Response

a.

b.

c.

d.

0

Question number: 41

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

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Appeared in Year: 2014

MCQ▾

Question

The figure below depicts a circular loop of radius carrying a fixed current . The upper half of the loop is placed in a uniform magnetic field of magnitude , perpendicular to the plane of the paper, as shown. The magnitude of the force on the loop is (neglect gravity) –

Half loop placed in magnetic field

Half Loop Placed in Magnetic Field

In figure a circular loop carrying fixed current I. The upper half of the loop is placed in a uniform magnetic field

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 42

» Thermodynamics » Thermal Equilibrium

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Appeared in Year: 2014

MCQ▾

Question

A body of mass with specific heat at temperature is brought into thermal equilibrium by contact with an identical body which was initially at a lower temperature . Now heat is lost to the surroundings and the temperatures are in kelvin. The change in entropy of the system is –

Choices

Choice (4) Response

a.

b.

c.

0

d.