(A) Are good conductor of heat & electricity
(B) Act as electron donors with metals & as electron acceptor with non-metals
(C) Are not necessarily solids at room temperature
(D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Q2. Fog is an example of colloidal system of
(A) Solid dispersed in gas
(B) Solid dispersed in liquid
(C) Liquid dispersed in gas
(D) Gas dispersed in liquid
Q3. Use of flux during soldering is done to
(A) Increase fluidity of solder by lowering its melting temperature
(B) Prevent oxide formation
(C) Wash away surplus solder
(D) Full up the joint gap
Q4. A jet engine turbine blade is normally manufactured by
(B) Shell moulding
(C) Investment casting
(D) Pressure die casting
Q5. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
Q6. X-rays are
(A) Positively charged
(B) Negatively charged
(D) Of higher wavelength than visible light
Q7. Aluminium is extracted from
(D) None of these
Q8. In extrusion of metals, which of the following statement is true?
(A) Speed of the extruded material is same as that of ram speed
(B) Redundant work is a function of the die angle
(C) Relative motion between the billet surface and the container wall is always present
(D) Hollow ram is used for indirect extrusion
Q9. Out of the following, the joint produced by __________ has the lowest strength.
Q10. __________ fluid force is not considered in the Navier-Stokes equation.