NEST (National Entrance Screening Test) Physics: Questions 7 - 9 of 58

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Question number: 7

» Kinematics » Projectile Motion

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Appeared in Year: 2013

MCQ▾

Question

Two identical particles are projected horizontally in opposite directions with a speed of each from the top of a tall tower as shown. Assuming , the distance between them at the moment when their velocity vectors become mutually perpendicular is –

Two identical particles on top of a tower

Two Identical Particles on Top of a Tower

In figure two identical particles are placed on the travels.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 8

» Dual Nature of Matter and Radiation » Particle Nature of Light

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Appeared in Year: 2007

MCQ▾

Question

Electrons cannot remain confined in a nucleus. This is because –

Choices

Choice (4) Response

a.

Pauli’s exclusion principle forbids electrons to be bound together in the same nucleus.

b.

Electrons confined in a nucleus will, according to the uncertainty principle, have so much kinetic energy that even electron – proton attraction will not be able to hold them bound.

c.

The size of an electron is about , which is much bigger than the typical size of a nucleus .

d.

Electron – electron repulsion will dominate electron – proton attraction inside the nucleus.

Question number: 9

» Work, Energy and Power » Work Done

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Appeared in Year: 2013

MCQ▾

Question

A particle of mass goes counterclockwise around a square path with vertices at in a force, . Here, and are positive constants. Consider the work done along the following paths:

(i)

(ii)

(iii)

(iv)

The work done is zero for –

Choices

Choice (4) Response

a.

Paths (ii) and (iv) only.

b.

Paths (ii), (iii) and (iv) only.

c.

Paths (i) and (ii) only.

d.

Paths (i), (iii) and (iv) only.