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Materials and Components problems

1. Assertion (A): Ferroelectric materials have spontaneous polarization.
Reason (R): Above curie temperature, ? = for ferro-electric materials.
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

2. Which capacitor-store higher amount of energy?
Options
A. Air capacitor
B. Paper capacitor
C. Mica capacitor
D. Plastic film capacitor

3. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
Options
A. the majority carrier density is doubled
B. the minority carrier density is doubled
C. the minority carrier density becomes 4 times the original value
D. both the majority and minority carrier densities double

4. Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, ?_r is nearly equal to 1.
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

5. Which element exhibits the property of inertia?
Options
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

6. In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.
Options
A. True
B. False

8. Assertion (A): If E is available energy state eV and E_F is Fermi level, then probability of energy state E being occupied = 0.5.
Reason (R): .
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

9. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be
Options
A. 0.08
B. 0.04
C. 0.001
D. 0.0001

10. If the diameter of a wire is doubled, its current carrying capacity becomes
Options
A. one-fourth
B. half
C. twice
D. four times

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