NEST (National Entrance Screening Test) Physics: Questions 37 - 39 of 58

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Question number: 37

» Thermodynamics » Carnot Engine and Its Efficiency

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Appeared in Year: 2015

MCQ▾

Question

A Carnot engine is made to operate as a refrigerator. This refrigerator is used to freeze water at to ice at and the heat from the working substance is discharged into a large tank containing water at . The latent heat of fusion of ice is . The minimum amount of work required to freeze of water is closed to –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 38

» Laws of Motion » Equilibrium of Concurrent Forces

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Appeared in Year: 2014

MCQ▾

Question

A girl of mass jumps from the shore onto a stationary boat of equal mass floating on a still pond. She jumps back to the shore almost immediately. Here speed in both cases is with respect to the shore. Consider het entire motion to be horizontal and in one dimension. Ignore friction and drag forces. The speed of the boat with respect to the shore after she jumps back is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 39

» Electrostatics » Electric Field Due to a Point Charge

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Appeared in Year: 2015

MCQ▾

Question

The variation of the magnitude of the electric field with radial distance due to a given configuration is depicted in the accompanying figure. The configuration could be –

Graph of electric field vs radial distance

Graph of Electric Field vs Radial Distance

In figure graph of electric field vs radial distance is shown

Choices

Choice (4) Response

a.

Thick spherical conducting shell with a point charge at its centre.

b.

Thick spherical dielectric shell with a point charge at its centre.

c.

Conducting sphere with surface charge.

d.

Two neutral concentric thin conducting shells with a point charge at the centre