Air entrainment in the concrete increases________________?

Related Mcqs:

1. Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is_____________?

   A. M15
   B. M20
   C. M 10
   D. M25

2. The property of the ingredients to separate from each other while placing the concrete is called____________?

   A. segregation
   B. compaction
   C. shrinkage
   D. bulking

3. Approximate value of shrinkage strain in concrete, is________________?

   A. 0.003
   B. 0.0003
   C. 0.00003
   D. 0.03

4. According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as______________?

   A. Ec = = 5700
   B. Ec = = 570
   C. Ec = = 5700fck
   D. Ec = where fck N/mm2 = 700 is the characteristic strength in

5. The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?

   A. fcr=0.35Vf7
   B. fcr=0.57f7
   C. fcr=0.7Vf7
   D. fcr=1.2Vf7
   where fcr and fck are in N/mm2′

6. In order to obtain the best workability of concrete, the preferred shape of aggregate is_______________?

   A. rounded
   B. elongated
   C. angular
   D. all of the above

7. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is_______________?

   A. 28 liters
   B. 30 liters
   C. 32 liters
   D. 34 liters

8. If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to__________________?

   A. xv
   B. xc
   C. xv – TC
   D. Tv + Tc

9. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?

   A. compressive and tensile
   B. tensile and compressive
   C. both compressive
   D. both tensile

10. Shrinkage of concrete depends upon_____________?

    1. humidity of atmosphere
    2. passage of time
    3. stress
    The correct answer is?

    A. (1) and (2)
    B. (2)and (3)
    C. only (3)
    D. All (1), (2)and (3)