Materials and Components
Thermistor is used in
Answer: D
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Which element exhibits the property of inertia?
Answer: C
Inductance opposes rise and decay of current. Hence it has the property of inertia.
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In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will
Answer: D
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In carbon resistor colour code, if the third band is of silver, it indicates
Answer: A
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Assertion (A): If difference between static and optical dielectric constant is high, the mechanical compressiblity of that material is also high.
Reason (R): For soft ions, ionic polarization per unit field is higher than that of hard ions.
Answer: A
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When a pentavalent impurity is added, the semiconductor becomes
Answer: B
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Assertion (A): Orbital magnetic moment of an electron in an atom is of the order of 1 Bohr magneton.
Reason (R): 1 Bohr magneton = 9.27 x 10-24 A/m2.
Answer: B
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Orbital magnetic dipole moment is due to the motion of electron in its orbit around nucleus.
Answer: A
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To produce magnetic flux, mmf is necessary.
Answer: A
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Assertion (A): For a solenoid having N turns, 
.
Reason (R): For all magnetic materials, B increases linearly with I.
Answer: C
Increase of B with I is not linear. Hence R is false.
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