Q1. __________ has a negative co-efficient of linear expansion.
Q2. Thermal efficiency of an internal combustion engine is around __________ percent.
Q3. Maximum permissible sulphur content in steel is __________ percent.
Q4. Hydrogen in liquid steels is dissolved
(A) As tiny gas bubbles
(B) In the atomic form
(C) In the ionic form
(D) In the molecular form
Q5. A spring material should have low
(A) Elastic limit
(B) Deflection value
(C) Fatigue resistance
(D) None of these
Q6. Nickel and __________ are the alloying element added in steel to increase its toughness.
Q7. A common disinfectant used in village wells for disinfection of water is
(A) Free chlorine
(D) Potassium permanganate
Q8. The lightest non-inflammable gas is
Q9. Which of the following is not an ore of copper?
Q10. The surface tension of a liquid, at critical temperature is
(D) Same as that at any other temperature