NEST (National Entrance Screening Test) Physics: Questions 1 - 3 of 58

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Question number: 1

» Physics and Measurement » Dimensional Analysis and Its Applications

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Appeared in Year: 2007

MCQ▾

Question

The scattering of an electromagnetic wave by a charged particle of charge and mass is described in terms of the ‘Thomson Cross Section’ , which has the dimension of area. On the basis of dimensional analysis, the possible formula for is – [The symbols have the usual meanings. ]

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

» Electrostatics » Electric Potential

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Appeared in Year: 2008

MCQ▾

Question

A spherical mercury droplet of radius has a charge . Twenty-seven such droplets are combined to make one large spherical drop. The ratio of the surface potential of the larger drop to that of each droplet is –

Choices

Choice (4) Response

a.

3

b.

9

c.

1

d.

27

Question number: 3

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

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Appeared in Year: 2008

MCQ▾

Question

A proton moves in the direction after being accelerate from rest through a potential difference . It then passes through a region with uniform electric field in the direction and a uniform magnetic field in the direction, but the proton’s trajectory is not affected. If the experiment is repeated using a potential difference of , the proton will be deflected in –

Choices

Choice (4) Response

a.

the direction

b.

the direction

c.

the direction

d.

the direction