Assertion (A): Metals are better heat conductors than insulators. Reason (R): If

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Question
Assertion (A): Metals are better heat conductors than insulators.
Reason (R): If is temperature gradient, Q is heat flow density and K is thermal conductivity, then Q = - K (dT/dx).
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

Correct Answer

Both A and R are true but R is not correct explanation of A

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2. High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
Options
A. reduce dc resistance
B. reduce ac resistance
C. increase dc resistance
D. increase ac resistance

4. Assertion (A): For a magnetic material M = (?_r - 1) H, where M is magnetic dipole moment/m³, H is field intensity A/m and ?_r is relative permeability.
Reason (R): ?_r can have any value from 0 to hundreds of thousands.
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

6. Semiconductors have a positive temperature coefficient of resistivity.
Options
A. True
B. False

8. For a given value (n) of principle quantum number, the number of possible electronic states are
Options
A. n
B. n²
C. n³
D. n

9. A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will
Options
A. increase
B. decrease
C. remain the same
D. may increase or decrease

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