A. Thermal & electrical insulator
B. Conductor of heat
C. Conductor of electricity
D. Both B. & C.
Related Mcqs:
- With increase in carbide/graphite ratio in cast iron, its__________________?
A. Hardness & brittleness increases
B. Ductility decreases
C. Both A. and B.
D. Neither A. nor B. - Graphite is corroded by_________________?
A. Sulphuric acid (10%)
B. Sea water
C. Hydrochloric acid
D. None of these - The ability of a material to offer resistance to scratching or indentation is a measure of its_________________?
A. Brittleness
B. Toughness
C. Hardness
D. Resilience - Sherardizing process is used for__________________?
A. Surface coating
B. Heat treatment of high speed steel
C. Cold working on metals
D. None of these - Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
A. Invar
B. Constantan
C. Chromel
D. Alumel - Brinell Hardness Number (BHN) for talc is approximately in the range of____________________?
A. 1-5
B. 20-30
C. 100 -150
D. 200 – 250 - Pick out the wrong statement?
A. Bronze is an alloy of copper & tin
B. Brass is an alloy of copper & zinc
C. The alloy named ‘German silver’ does not contain any silver
D. The ability of a material to fracture without appreciable deformation is called its ductility - Plastics are____________________?
A. Used in very high temperature applications
B. Non-biodegradable
C. Not suitable for drainage pipe manufacture
D. All A., B. & C. - A material capable of undergoing large permanent deformation, when subjected to compression is termed as___________________?
A. Malleable
B. Ductile
C. Brittle
D. None of these - Cementite is________________?
A. Fe3C chemically
B. A compound of carbon and iron
C. Characterised by an orthorhombic crystal structure
D. All A., B. and C.