Engineering :: Engineering Mechanics
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81. |
The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudenal axis or polar axis is |
A. |
mr2 / 2 |
B. |
mr2 / 4 |
C. |
mr2 / 6 |
D. |
mr2 / 8 |
Answer: Option A
Explanation:
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82. |
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is |
A. |
mr2 / 3 |
B. |
2mr2 / 3 |
C. |
2mr2 / 5 |
D. |
3mr2 / 5 |
Answer: Option B
Explanation:
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83. |
The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is |
A. |
2mr2 / 3 |
B. |
2mr2 / 5 |
C. |
7mr2 / 3 |
D. |
7mr2 / 5 |
Answer: Option D
Explanation:
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84. |
The moment of inertia of a solid sphere of mass m and radius r is |
A. |
2mr2 / 3 |
B. |
2mr2 / 5 |
C. |
mr2 |
D. |
mr2 / 2 |
Answer: Option B
Explanation:
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85. |
The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is |
A. |
3mr2 / 5 |
B. |
3mr2 / 10 |
C. |
2mr2 / 5 |
D. |
4mr2 / 5 |
Answer: Option B
Explanation:
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86. |
A force acting in the opposite direction to the motion of the body is called force of friction. |
Answer: Option A
Explanation:
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87. |
The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as |
A. |
static friction |
B. |
dynamic friction |
C. |
limiting friction |
D. |
coefficient of friction |
Answer: Option C
Explanation:
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88. |
The friction experienced by a body, when at rest, is known as |
A. |
static friction |
B. |
dynamic friction |
C. |
limiting friction |
D. |
coefficient of friction |
Answer: Option A
Explanation:
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89. |
The ratio of static friction to dynamic friction is always |
A. |
equal to one |
B. |
less than one |
C. |
greater than one |
D. |
none of these |
Answer: Option C
Explanation:
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90. |
The friction experienced by a body, when in motion, is known as |
A. |
rolling friction |
B. |
dynamic friction |
C. |
limiting friction |
D. |
static friction |
Answer: Option B
Explanation:
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