Which of the following is the poorest conductor of electricity? Aluminium Nichro

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Question
Which of the following is the poorest conductor of electricity?
Options
A. Aluminium
B. Nichrome
C. Copper
D. All of the above

Correct Answer

Nichrome

Materials and Components problems

Search Results

1. A permeable substance is one
Options
A. which is strong magnet
B. which is a weak magnet
C. which is a good conductor
D. through which magnetic lines of force can pass easily

2. Ferrites have
Options
A. a low copper loss
B. low eddy current loss
C. low resistivity
D. higher specific gravity compared to iron

4. In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, �_r will
Options
A. increase
B. decrease
C. first decrease then increase
D. first increase then decrease

5. A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be
Options
A. 2.5 mH
B. 5 mH
C. 20 mH
D. 40 mH

6. In a pure sample of silicon
Options
A. the number of holes and free electrons is always equal
B. the number of free electrons is more than the number of holes
C. the number of free electrons and holes is equal at low temperature
D. the number of free electrons is less than number of holes

8. Assertion (A): In a parallel plate capacitor having area of plate 1 m² and plate separation 1 m, the capacitance C and resistance R are given by C = ?₀?^'_r and R = where ? is frequency, ?_r^' and ?_r^" are real and imaginary parts of dielectric constant.
Reason (R): The imaginary part of electric constant is responsible for dielectric losses.
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. Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.
Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.
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

10. When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ?^'_r - j?^"_r . In such materials, the dielectric losses under alternating stress is proportional
Options
A. ?^"_r
B. both ?^'_r and ?^"_r
C. ?^'_r
D. (?^"_r)²

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