Gravitation (NEET Physics): Questions 75 - 79 of 82

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Question number: 75

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

Four particles, each of mass m, are placed at the corners of square and moving along a circle of radius r under the influence of mutual gravitational attraction. The speed of each particle will be –

Choices

Choice (4) Response

a.

Gmr(22+14)

b.

22Gmr

c.

Gmr

d.

Gmr(22+1)

Question number: 76

» Gravitation » Gravitational Acceleration

MCQ▾

Question

On a planet (whose size is the same as that of earth and mass 6 times to the earth) the energy needed to lift a 2 kg mass vertically upwards through 4 m distance on the planet is (g = l0 m/sec 2 on the surface of earth) –

Choices

Choice (4) Response

a.

320 J

b.

480 J

c.

560 J

d.

470 J

Passage

Read the passage given below and answer the questions that follows:

The orbit of Pluto is much more eccentric than the orbits of the other planets. That is, instead of being nearly circular, the orbit is noticeably elliptical. The point in the orbit nearest to the sun is called the perihelion and the point farthest from the sun is called the aphelion.

Orbit of Pluto - perihelion and the aphelion

Orbit of Pluto - Perihelion and the Aphelion

In above figure we shows that the perihelion and the aphelion of the Pluto’s orbit.

Question number: 77 (1 of 3 Based on Passage) Show Passage

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

At perihelion, the mechanical energy of Pluto’s orbit has

Choices

Choice (4) Response

a.

The same value as at every other point in the orbit

b.

Its minimum value

c.

Its maximum value

d.

Value which depends on sense of rotation

Question number: 78 (2 of 3 Based on Passage) Show Passage

» Gravitation » Gravitational Potential

MCQ▾

Question

As Pluto moves from the perihelion to the aphelion, the work done by gravitational pull of Sun on Pluto is

Choices

Choice (4) Response

a.

zero

b.

Depends on sense of rotation

c.

positive

d.

negative

Question number: 79 (3 of 3 Based on Passage) Show Passage

» Gravitation » Gravitational Potential

MCQ▾

Question

At perihelion, the gravitational potential energy of Pluto in its orbit has

Choices

Choice (4) Response

a.

Its maximum value

b.

The same value as at every other point in the orbit

c.

Value which depends on sense of rotation

d.

Its minimum value

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