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61
When a body of mass moment of inertia '$$I$$' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is
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Answer: Option D
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62
The minimum force required to slide a body of weight 'W' on a rough horizontal plane is
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Answer: Option C
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63
The acceleration of a particle moving with simple harmonic motion, at any instant is given by
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Answer: Option B
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64
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted and C = Another constant which represents the machine friction.)
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Answer: Option C
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65
A machine having an efficiency greater than 50%, is known as
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Answer: Option A
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66
The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis.
(where h = Height of a right circular solid cone.)
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Answer: Option C
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67
The time of flight (t) of a projectile on a horizontal plane is given by
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Answer: Option A
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68
The range of a projectile is maximum, when the angle of projection is
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Answer: Option B
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69
In actual machines
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Answer: Option C
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70
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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