Metalloids________________?

Related Mcqs:

1. Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?

   A. Removed by acid pickling
   B. Hammered into the surface
   C. Removed with coarse emery cloth
   D. Left as such to protect the surface

2. Oxyacetylene reducing flame is used while carrying out welding on__________________?

   A. Alloy steel
   B. Grey cast iron
   C. Mild steel
   D. High carbon steel

3. With decrease in the grain size of a material, its creep resistance___________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. Either A. or B.; depends on the material

4. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?

   A. Propane and acetylene
   B. Propane and LPG
   C. Sewage gas and gobar gas
   D. B.F gas and coke oven gas

5. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?

   A. A
   B. D
   C. 1/A
   D. 1/A2

6. Otto cycle used in spark ignition petrol engines is also known as the constant ________________ cycle?

   A. Volume
   B. Pressure
   C. Heat
   D. None of these

7. Energy to be supplied to the radioactive nucleus for the emission of a neutron is ________________ MeV?

   A. 0.8
   B. 7.8
   C. 200
   D. 10000

8. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in _______________ electrons ?

   A. Lack of free
   B. Excess of
   C. Decrease in
   D. None of these

9. _______________ is not a case hardening process ?

   A. Carburising
   B. Nitriding
   C. Cyaniding
   D. Annealing

10. Ammonia gas can be dried by___________________?

    A. PCl5
    B. Quick lime
    C. CaCl2
    D. Concentrated H2SO4