A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.

Related Mcqs:

1. Semi-conductor germanium and silicon are_________________?

   A. pentavalent
   B. trivalent
   C. divalent
   D. tetravalent

2. To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________?

   A. 2
   B. 3
   C. 4
   D. 5

3. If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?

   A. 1/6th
   B. 1/8th
   C. 1/10th
   D. None of these

   Submitted by: Nayab Idrees

4. The velocity of sound in air would become double than its velocity at 0°C at temperature ?

   A. 313°C
   B. 586°C
   C. 819°C
   D. 1172°C

5. The curie temperature is that at which ____________________?

   A. Semi-conductor becomes conductors
   B. Ferromagnetic becomes paramagnetic
   C. Paramagnetic becomes diamagnetic
   D. Metals become super conductor

6. As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?

   A. shifts towards longer wavelength
   B. shifts towards shorter wavelength
   C. remain the same
   D. shifts towards longer as well as shorter wavelengths

7. Temperature is a property which determines_________________?

   A. How much heat a body contains
   B. Whether a body will feel hot or cold to touch
   C. In which direction heat will flow between two systems
   D. How much total absolute energy a body has

8. The scales of temperature are based on two fixed points which are_________________?

   A. The temperatures of water at 0? 100?C
   B. The temperature of melting ice and boiling water at atmospheric pressure
   C. The temperatures of ice cold and boiling water
   D. The temperatures of frozen and boiling mercury

9. If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of______________?

   A. Boyles law
   B. Charles law
   C. Ideal gas law
   D. Avagadros law

10. If electrical conductivity increases with the increase of temperature of a substance, then it is a:

    A. Semiconductor
    B. Conductor
    C. Insulator
    D. None of the above

    Submitted by: Naveed Tahir