Gravitation-Energy (NEET Physics): Questions 1 - 4 of 10

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Question number: 1

» Gravitation » Energy

MCQ▾

Question

A projectile is fired vertically upward from the surface of earth with a velocity Kvems . where vems is the escape velocity and K < 1. Neglecting air resistance, the maximum height to which it will rise measured from the center of the earth is - (where R = radius of earth)

Choices

Choice (4) Response

a.

1K2R

b.

RK2

c.

K2R

d.

R1K2

Question number: 2

» Gravitation » Energy

MCQ▾

Question

A body of mass 100 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s 2. Air friction is negligible.

Choices

Choice (4) Response

a.

6.27 ⨯ 10 10 J

b.

6.27 ⨯ 10 8 J

c.

6.27 ⨯ 10 9 J

d.

6.27 ⨯ 10 7 J

Question number: 3

» Gravitation » Energy

Assertion-Reason▾

Assertion (Ꭺ)

If an earth satellite moves to a lower orbit, there is some dissipation of energy but the speed of gravitational satellite increases.

Reason (Ꭱ)

The speed of satellite is a constant quantity.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 4

» Gravitation » Energy

MCQ▾

Question

Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –

Choices

Choice (4) Response

a.

74378363

b.

(74378363)2

c.

(83637437)2

d.

83637437

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