If a single pipe of length L and diameter D is to be replaced by three pipes of

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If a single pipe of length L and diameter D is to be replaced by three pipes of same material, same length and equal diameter d (d < D), to convey the same total discharge under the same head loss, then d and D are related by
Options
A.
B.
C.
D.

Correct Answer

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2. To double the period of oscillation of a simple pendulum
Options
A. the mass of its bob should be doubled
B. the mass of its bob should be quadrupled
C. its lenght should be quadrupled
D. its length should be doubled.

3. Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated.

Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.
Options
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

5. Due to the impact of water wave on a sea shore structure
Options
A. hydrostatic pressure coupled with a strong momentary impact is caused
B. vibrations are subjected
C. internal pressure is developed
D. weakens the foundation
E. all of the above.

8. According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on an other medium (refractive index m₂);
Options
A. the angle of incidence is equal to the angle of refraction
B. the angle of refraction (?r) is given by
C. Both (a) and (b)
D. neither (a) nor (b)

9. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is
Options
A. rounded aggregate
B. irregular aggregate
C. angular aggregate
D. flaky aggregate
E. none of these.

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