The dielectric constant k of an insulator cannot be
|
(a) 3 |
(b) 6 |
(c) 8 |
(d) ∞ |
The dielectric constant k of an insulator cannot be
|
(a) 3 |
(b) 6 |
(c) 8 |
(d) ∞ |
(d) ∞
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In a semiconductor, the concentration of electrons is 8 and that of the holes is 5
The semiconductor is
|
(a) P-type |
(b) N-type |
(c) Intrinsic |
(d) PNP-type |
A thermo couple develops 200μV between 0℃ and 100℃. If it develops 64μV and 76μV respectively between (0℃ - 32℃) and (32℃ - 70℃) then what will be the thermo emf it develops between 70℃ and 100℃
|
(a) 65 μV |
(b) 60 μV |
(c) 55 μV |
(d) 50 μV |
Half life of a radio-active substance is 20 minutes. The time between 20% and 80% decay will be
|
(a) 20 minutes |
(b) 40 minutes |
(c) 30 minutes |
(d) 25 minutes |
An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is
|
(a) 0.11 cm |
(b) 0.50 cm |
(c) 0.55 cm |
(d) 0.60 cm |
An oscillator is nothing but an amplifier with
|
(a) Positive feed back |
(b) Large gain |
|
(c) No feedback |
(d) Negative feedback |