Which one of the following set of values give the minimum clear cover (in mm) fo

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Question
Which one of the following set of values give the minimum clear cover (in mm) for the main reinforcements in the slab, beam, column and footing, respectively, according to IS : 456-1978?
Options
A. 20, 25, 30, 75
B. 5, 15, 25, 50
C. 15, 25, 40, 75
D. none of the above

Correct Answer

15, 25, 40, 75

4. The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is , the velocities of separation of the balls will be equal to
Options
A. original velocity in the same direction
B. half the original velocity in the same direction
C. half the original velocity in the opposite direction
D. original velocity in the opposite direction

10. In network of pipes
Options
A. the algebraic sum of discharges around each circuit is zero
B. the algebraic sum of (pressure + datum) head drops around each circuit is zero
C. the elevation of hydraulic grade line is assumed for each junction point
D. elementary circuits are replaced by equivalent pipes

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