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11
Frictional force encountered after commencement of motion is called
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Answer: Option D
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12
The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be
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Answer: Option A
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13
Center of percussion is
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Answer: Option C
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14
Two coplanar couples having equal and opposite moments
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Answer: Option D
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15
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of
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Answer: Option D
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16
The magnitude of two forces, which when acting at right angle produce resultant force of $$\sqrt {10} $$  kg and when acting at 60° produce resultant of $$\sqrt {13} $$  kg. These forces are
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Answer: Option C
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17
If three forces acting in different planes can be represented by a triangle, these will be in
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Answer: Option A
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18
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
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Answer: Option D
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19
In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
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Answer: Option B
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20
Which of the following is not a scalar quantity
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Answer: Option D
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