Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?

Related Mcqs:

1. The energy band occupied by the valence electrons is called___________________?

   A. Energy state
   B. Valence band
   C. ve energy state
   D. conduction band

2. Semi-conductors with donor atoms and free electrons belong to the type________________?

   A. n
   B. p
   C. mix
   D. any of above

3. The electrons in conduction band are free to___________________?

   A. Transport vibrations
   B. Transport signals
   C. Transport charge
   D. Transport impulses

4. If the density of atoms remain same along any direction in a crystal is called__________________?

   A. Symmetry
   B. Homogeneity
   C. Isotropy
   D. Cleavage

5. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

   A. he/ev
   B. he/Vc
   C. eV/h
   D. impossible to predict

6. The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?

   A. 6.2 x 10-10m
   B. 9.1 x 10-18m
   C. 3.11 x 10-10m
   D. 4 x 10-10m

7. Electrons present in p-type material due to thermal pair generation are_____________?

   A. majority carriers
   B. minority carriers
   C. dual carriers
   D. blockers

8. How many electrons per second constitute a current of one micro ampere?

   A. one electron
   B. 10 ^–6 electrons
   C. 10⁶ electrons
   D. 6.25 × 10¹² electrons

   Submitted by: Tauseef Ali

9. When we excite some atoms by heat collision or electrical discharge they will________________?

   A. radiate electromagnetic energy with a continuous distribution of wavelength
   B. absorb particular wavelengths when white light is incident on them
   C. radiate electromagnetic energy of discrete characteristic wavelength
   D. emit either invisible or visible light

10. In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

    A. Metal stable state
    B. Normal state
    C. Inverted population
    D. All the above