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Materials and Components problems

2. If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to
Options
A. R
B. R²
C. R³
D.

5. An atom of a rare gas is placed is an electric field E. Then
Options
A. the nucleus will be shifted in the direction of E by an amount which is proportional to E.
B. the nucleus will not be shifted.
C. the nucleus will be shifted in the direction of E by an amount which is independent of E.
D. the nucleus will be shifted in a direction opposite to that of E.

6. Assertion (A): A capacitor with imperfect dielectric can be represented by a capacitance in parallel with resistance.
Reason (R): For imperfect dielectrics, dielectric constant has real and imaginary parts.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

7. In a metal, the valence electrons
Options
A. are not shared
B. are shared only between neighbouring atoms
C. are shared by all atoms
D. either (b) or (c)

9. The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
Options
A. Matthiessen's rule
B. Debye rule
C. Curie rule
D. Onne's rule

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