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ISRO 2018 Engineering Mechanics Booster Quiz 3
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Question 1
The ratio of Static Friction to Dynamic friction is always(when the object in motion)
Question 2
A particle moves along a curve whose parametric equations are : x=t3 + 2t, y=-3e-2t and z = 2 sin (5t), where x, y and z show variations of the distance covered by the particle (in cm) with time t (in s). The magnitude of the acceleration of the particle (in cm/s2) at t = 0 is _________ cm2/s
Question 3
Coplanar concurrent force are those forces which
Question 4
If the moment of inertia of a section about its axis is / and its effective sectional area is A, its radius of gyration r about the axis is
Question 5
A block placed on horizontal surface is being pushed by a force F making an angle 
with vertical. If the coefficient of friction is 
,how much force is needed to get the block just started (tan 
>
)
with vertical. If the coefficient of friction is ,how much force is needed to get the block just started (tan >) Question 6
A block of weight W on the verge of motion acted upon by force P. Let R be the resultant reaction at the contact surface acting at an angle of ∅. If the direction of force is changed by rotating it through 360 ° in a plane parallel to the contact surface, the force R will generate.
Question 7
A valve of pipeline was to be opened, the valve stock was connected with a horizontal rod. For which two men were required to pull the ends of the rod in opposite direction. When looking from the top, the person on the upper side pulls it towards the left. It will cause a ;
Question 8
A rigid ball of weight 100 N is suspended with the help of a string. The ball is pulled by a horizontal force F such that the string makes an angle of 30 ° with the vertical. The magnitude of force F (in N) is __________
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