Which of these has the highest dielectric strength? Mica Air Cotton Rubber

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Question
Which of these has the highest dielectric strength?
Options
A. Mica
B. Air
C. Cotton
D. Rubber

Correct Answer

Mica

Materials and Components problems

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1. The temperature coefficient of resistivity of semiconductors is
Options
A. positive
B. negative
C. may be positive or negative
D. very low

3. Assertion (A): In an intrinsic semiconductor J = (?_n x ?_p)en_i.
Reason (R): Intrinsic charge concentration n_i at temperature T is given by n_i² = A₀ T³ e^-E_G0/kT.
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

4. A parallel plate capacitor has area of plate A and plate separation d. Its capacitance is C. A metallic plate P of area A and negligible thickness is added as shown in Figure. The new value of capacitance is
Options
A. C
B. 2C
C. 0.5 C
D. 0.25 C

7. Assertion (A): Doping level in extrinsic semiconductors is very small.
Reason (R): Additional of impurity in the ratio of 1 part in 10⁸ parts increases the number of charge carriers by about 20.
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

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