NEST (National Entrance Screening Test) Physics: Questions 4 - 6 of 58

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Question number: 4

» Laws of Motion » Static and Kinetic Friction

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Appeared in Year: 2007

MCQ▾

Question

A cubical container is placed on a frictionless horizontal surface. A molecule of a gas in the container hits a vertical wall of the container normally and rebounds with the same speed. In elastic collision the container picks up –

[‘Finite’ means ‘comparable to the corresponding molecular quantity’. ]

Choices

Choice (4) Response

a.

Negligible momentum, kinetic energy and velocity.

b.

Finite kinetic energy, but negligible momentum and velocity.

c.

Finite momentum and finite kinetic energy but negligible velocity.

d.

Finite momentum, but negligible kinetic energy and velocity.

Question number: 5

» Gravitation » Universal Law of Gravitation

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Appeared in Year: 2007

MCQ▾

Question

A black hole is an object from which even light cannot escape. A star of mass , collapsing due to gravity, becomes a black hole when its radius is . At this stage, the density of the black hole depends on as –

Choices

Choice (4) Response

a.

is proportional to

b.

is independent of

c.

is proportional to

d.

is proportional to

Question number: 6

» Wave Optics » Interference

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Appeared in Year: 2007

MCQ▾

Question

In a double slit experiment, two identical point sources are placed on the line perpendicular to the two slits and as shown. (The figure is not to scale. The screen is placed far away compared to the distance between the slits. )

Quadrilateral poly1 Quadrilateral poly1: Polygon I, J, K, L Segment f Segment f: Segment [A, B] Segment g Segment g: Segment [C, D] Segment h Segment h: Segment [E, F] Segment i Segment i: Segment [G, H] Segment i_1 Segment i_1: Segment [I, J] of Quadrilateral poly1 Point M Point M: Point on i Point M Point M: Point on i Point N Point N: Point on i Point N Point N: Point on i Screen text1 = “Screen” Screen text1 = “Screen” Screen text1 = “Screen” Screen text1 = “Screen” Screen text1 = “Screen” Screen text1 = “Screen” P text1_1 = “P” Q text1_2 = “Q” S_2 text1_3 = “S_2” S_2 text1_3 = “S_2” S_1 text1_4 = “S_1 “ S_1 text1_4 = “S_1 “

A Double Slits Experiment Set Up

In figure a double slits experiment set up with two source S1 and S2.

When only is switched on, there is an interference pattern with a peak intensity . When only is switched on, there is an interference pattern with peak intensity . When both and are switched on –

Choices

Choice (4) Response

a.

The intensity on the screen will vary from to .

b.

The intensity on the screen will vary from to .

c.

There will be a uniform intensity on the screen.

d.

The intensity on the screen will vary from to