2.Which of the following is used to protect environment from pollution?

4.The critical path in a network has

5.The effective length of a column in case of both ends hinged is

1.The ratio of the actual vapour pressure to the saturation vapour pressure is called

2.The quantity of cement required for 1 cubic meter of 1:2:4 concrete mix is approximately

3.The main cause of air pollution from vehicles is

4.The method used to determine the consistency of cement is

5.The maximum super elevation on highways in plain terrain as per IRC is about

3.The concrete grade M20 represents

1.The optimum moisture content corresponds to

2.The curing period for concrete to attain about 70% strength is

3.The factor of safety against overturning for a retaining wall should not be less than

4.The minimum cover for RCC slab reinforcement as per IS 456 is

5.The process of determining the relative position of different points on the earth’s surface is known as