1.Which one of the following is incombustible ?

A.  H2

B. CCl4

C. C2H2

D. S

2. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
A. hard
B. soft
C. silicon carbide
D. aluminium oxide
3. Tin based white metals are used, where bearings are subjected to
A. high pressure & load.
B. low pressure & load.
C. high temperature.
D. large surface wear.
4. Friction factor for fluid flow in pipe does not depend upon the
A. pipe length.
B. pipe roughness.
C. fluid density & viscosity.
D. mass flow rate of fluid.
5. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
A. nickel
B. vanadium
C. molybdenum
D. chromium