Silicon crystal can be converted to p-type semi-conductor by doping with__________________?

Related Mcqs:

1. Silicon percentage in silicon steel used for electrical equipments is about______________?

   A. 1
   B. 4.0
   C. 8
   D. 14

2. Silicon percentage in the silicon steel used for electrical appliances/equipments is_________________?

   A. 0.3-0.4
   B. 12-14
   C. 3-4
   D. 20-25

3. Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils ?

   A. Elaiden test
   B. Reichert-Meissl value test
   C. Hunter value test
   D. Iodine value test

4. Addition of silicon to cast iron ___________________?

   A. Promotes graphite module formation
   B. Improves its ductility
   C. Does not promote graphite flakes formation
   D. Increases the fluidity of molten metal

5. In osmosis through a semi-permeable membrane, diffusion of the___________________?

   A. Solvent is from low concentration to high concentration region
   B. Solvent is from high concentration to low concentration region
   C. Solute takes place
   D. None of these

6. Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?

   A. Vapor to liquid
   B. Vapor to solid
   C. Solid to liquid
   D. One allotropic form to another allotropic form

7. Vibration upto 100 kilo hertz can be most accurately measured by a ________________ type accelerometer ?

   A. Preloaded spring
   B. Piezoelectric
   C. Bonded strain gauge
   D. None of these

8. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?

   A. CO2
   B. CH4
   C. CO
   D. H2

9. The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?

   A. Anaerobic
   B. Saprophytic
   C. Aerobic
   D. Parasitic

10. Which of the following is a type of sedimentary rock?

    A. Organic rock
    B. Chemical rock
    C. Clastic rock
    D. All of the above

    Submitted by: Sajjad Ali Tagar