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1. The necessary condition of equilibrium of a body is: A. Algebraic sum of horizontal components of all the forces must be zero B. Algebraic sum of vertical components of all the forces must be zero C. Algebraic sum of the moments of the forces about a point must be zero D. All (A), (B) and (C)

Algebraic sum of horizontal components of all the forces must be zero

Algebraic sum of vertical components of all the forces must be zero

Algebraic sum of the moments of the forces about a point must be zero

All (A), (B) and (C)

A. Algebraic sum of horizontal components of all the forces must be zero B. Algebraic sum of vertical components of all the forces must be zero C. Algebraic sum of the moments of the forces about a point must be zero D. All (A), (B) and (C)" class="read-more button" href="https://exam.pscnotes.com/mcq/the-necessary-condition-of-equilibrium-of-a-body-is-a-algebraic-sum-of-horizontal-components-of-all-the-forces-must-be-zero-b-algebraic-sum-of-vertical-components-of-all-the-forces-must-be-zero-c/#more-6804">Detailed Solution

2. Newton’s law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation A. Is directly proportional to their velocity of approach B. Is inversely proportional to their velocity of approach C. Bears a constant ratio to their velocity of approach D. Is equal to the sum of their velocities of approach

Is directly proportional to their velocity of approach

Is inversely proportional to their velocity of approach

Bears a constant ratio to their velocity of approach

Is equal to the sum of their velocities of approach

Detailed SolutionNewton’s law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation A. Is directly proportional to their velocity of approach B. Is inversely proportional to their

velocity of approach C. Bears a constant ratio to their velocity of approach D. Is equal to the sum of their velocities of approach

3. Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis? A. Disc with larger density B. Disc with smaller density C. Both discs will have same rotational inertia D. None of the above

Disc with larger density

Disc with smaller density

Both discs will have same rotational inertia

None of the above

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density C. Both discs will have same

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rotational inertia D. None of the above" class="read-more button" href="https://exam.pscnotes.com/mcq/two-circular-discs-of-same-weight-and-thickness-are-made-from-metals-having-different-densities-which-disc-will-have-the-larger-rotational-inertia-about-its-central-axis-a-disc-with-larger-density/#more-6801">Detailed Solution

4. The ratio of kinetic energy and potential energy of a simple harmonic oscillator, at a displacement equal to half its amplitude is given by A. 1 : 2 B. 1 : 1 C. 2 : 1 D. 3 : 1

01:02

01:01

02:01

03:01

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576 512"> Subscribe on YouTube

amplitude is given by A. 1 : 2 B. 1 : 1 C. 2 : 1 D. 3 : 1" class="read-more button" href="https://exam.pscnotes.com/mcq/the-ratio-of-kinetic-energy-and-potential-energy-of-a-simple-harmonic-oscillator-at-a-displacement-equal-to-half-its-amplitude-is-given-by-a-1-2-b-1-1-c-2-1-d-3-1/#more-6802">Detailed Solution

5. The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of A. 8.04 km/sec at a height of 285 km B. 11.11 km/sec at a height of 37,400 km C. 11.26 km/sec, the satellite escapes the pull of the earth D. All the above

8.04 km/sec at a height of 285 km

11.11 km/sec at a height of 37,400 km

11.26 km/sec, the satellite escapes the pull of the earth

All the above

Detailed SolutionThe

gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of A. 8.04 km/sec at a height

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of 285 km B. 11.11 km/sec at a height of 37,400 km C. 11.26 km/sec, the satellite escapes the pull of the earth D. All the above

6. The unit of impulse, is A. kg.m/sec B. kg.m/sec3 C. kg.m/sec2 D. kg.m2/sec

kg.m/sec

kg.m/sec3

kg.m/sec2

kg.m2/sec

Detailed

64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube

Solution

7. From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The C.G. of the remainder is at a height of A. 4.5 cm B. 5.0 cm C. 5.25 cm D. 5.5 cm

4.5 cm

5.0 cm

5.25 cm

5.5 cm

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cm C. 5.25 cm D. 5.5 cm" class="read-more button" href="https://exam.pscnotes.com/mcq/from-a-solid-cylinder-of-height-8-cm-and-radius-4-cm-a-right-circular-cone-is-scooped-out-on-the-same-base-and-having-the-same-height-as-that-of-the-cylinder-the-c-g-of-the-remainder-is-at-a-height/#more-6798">Detailed Solution

8. Force polygon method is applicable for A. any copianar force system B. a system of parallel forces only C. concurrent copianar force system D. non-concurrent copianar force system

any copianar force system

a system of parallel forces only

concurrent copianar force system

non-concurrent copianar force system

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copianar force system D. non-concurrent copianar force system" class="read-more button" href="https://exam.pscnotes.com/mcq/force-polygon-method-is-applicable-for-a-any-copianar-force-system-b-a-system-of-parallel-forces-only-c-concurrent-copianar-force-system-d-non-concurrent-copianar-force-system/#more-6797">Detailed Solution

9. If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along A. The same line in the same sense B. The same line in opposite sense C. The perpendicular to both the lines D. None of these

The same line in the same sense

The same line in opposite sense

The perpendicular to both the lines

None of these

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11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube in equilibrium, they must be equal in magnitude and their line of action must be along A. The same line in the same sense B. The same line in opposite sense C. The perpendicular to both the lines D. None of these" class="read-more button" href="https://exam.pscnotes.com/mcq/if-two-forces-acting-at-a-point-are-in-equilibrium-they-must-be-equal-in-magnitude-and-their-line-of-action-must-be-along-a-the-same-line-in-the-same-sense-b-the-same-line-in-opposite-sense-c-the/#more-6795">Detailed Solution

10. Force polygon method is applicable for A. Any coplanar force system B. A system of parallel forces only C. Concurrent coplanar force system D. Non-concurrent coplanar force system

Any coplanar force system

A system of parallel forces only

Concurrent coplanar force system

Non-concurrent coplanar force system

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A system of parallel forces only C. Concurrent coplanar force system D. Non-concurrent coplanar force system" class="read-more button" href="https://exam.pscnotes.com/mcq/force-polygon-method-is-applicable-for-a-any-coplanar-force-system-b-a-system-of-parallel-forces-only-c-concurrent-coplanar-force-system-d-non-concurrent-coplanar-force-system/#more-6796">Detailed Solution

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