Properties of Concrete and Steel

Q. High yield deformed bars have a

1. definite yield value
2. chemical composition different from mild steel
3. percentage elongation less than of mild steel
4. percentage elongation more than of mild steel

Q. Long term elastic modulus of M25 Concrete was found to be 15000 MPa. If elastic strain was measured 0.0003 , find the strain in concrete in long term .

1. 0.0002
2. 0.0003
3. 0.0004
4. 0.0005

Q. The carbonation process is demonstrated more by

1. Atmospheric corrosion
2. Chloride corrosion
3. Stress corrosion
4. Hydrogen embrittlement

Q. Which of the following statements is incorrect

1. SP 34 is used for detailing in RCC structures
2. Cylinder strength is less than cube strength of concrete
3. Compressive strength remains constant for all concrete cylinder prepared from same mix with changed dimensions
4. None of these