NEET Physics: Questions 2003 - 2007 of 2098

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Question number: 2003

» 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: 2004

» Rotational Motion » Radius of Gyration

MCQ▾

Question

The radius of gyration of a disc of mass 50 g and radius 2.5 cm, about an axis passing through its center of gravity and perpendicular to the plane is

Choices

Choice (4) Response

a.

1.76 cm

b.

6.54 cm

c.

0.52 cm

d.

3.54 cm

Question number: 2005

» 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

Question number: 2006

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two rings of the same radius and mass are placed such that their centers are at a common point and their planes are perpendicular to each other. The moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings is (mass of the ring = m and radius = r)

Choices

Choice (4) Response

a.

32mr2

b.

2 mr2

c.

mr2

d.

12mr2

Question number: 2007

» Rotational Motion » Torque

MCQ▾

Question

A thin wire of length L and uniform linear mass density ρ is bent into a circular loop with center at O as shown in figure. The moment of inertia of the loop about the axis XX’ is

Circular loop of wire of length L

Circular Loop of Wire of Length L

Thin wire of length L and uniform linear mass density p is bent into a circular loop with center at O

Choices

Choice (4) Response

a.

3ρL38π2

b.

ρL316π2

c.

5ρL316π2

d.

ρL38π2

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