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Materials and Components Questions And Answers.

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Exercise :: Materials and Components
1.Which capacitor-store higher amount of energy?
A. Air capacitor
B. Paper capacitor
C. Mica capacitor
D. Plastic film capacitor
2.In paramagnetic materials
A. permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B. permanent magnetic dipole do not exist
C. permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D. permanent magnetic dipole moment may or may not exist
3.Please find the correct values:

Assertion (A): Atomic number of sodium is 11.

Reason (R): Sodium has a body centred cubic lattice.

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.The conductivity of intrinsic semiconductor is given by
A. eni(μp - μn)
B. eni(μp + μn)
C. ni(μp + μn)
D. ni(μpμn)
5.The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be
A. 32 mH
B. 16 mH
C. 8 mH
D. 4 mH