In molecules of ionic crystals, orientation polarization is zero.
Answer: A
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Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.
Reason (R): Thermionic emission current ∝ T2 e-Ew/kT.
Answer: A
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Assertion (A): At a temperature of 1000 K, thermionic emission current is about 0.1 A/cm2 of surface.
Reason (R): Thermionic emission current is given by Ith = SA0 T2 e-Ew/kT.
Answer: A
If different values are substituted in the equation for Ith the value of emission current comes out to be about 0.1 A/cm2.
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Assertion (A): CO2 has no resultant dipole moment but CO has a dipole moment.
Reason (R): The structure of CO2 is O = C = O.
Answer: A
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The colour code on a carbon resistor is green-blue-yellow. The tolerance is
Answer: C
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In a pure sample of silicon
Answer: A
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If a sample of germanium and a sample of silicon have the same impurity density and are kept at room temperature
Answer: D
Resistivity of silicon is more than that of germanium.
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In crystalline solids, atoms are stacked in a regular manner.
Answer: A
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The minority carrier life time and diffusion constant in a semiconducting material are 100 μs and 100 cm2/s respectively. The diffusion length of carriers is
Answer: B
Diffusion length = sqrt(Carrier life time x Diffusion constant) = (100 x 10-6 x 100)0.5 = 0.1 cm.
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Which solid dielectric has highest temperature limit?
Answer: C
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