When a compact disc is illuminated by a source of white light. Coloured 'lanes' are observed. This is due to
|
(a) Dispersion |
(b) Diffraction |
(c) Interference |
(d) Refraction |
(b) Diffraction
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In the absence of other conductors, the surface charge density
|
(a) Is proportional to the charge on the conductor and its surface area |
|
(b) Inversely proportional to the charge and directly proportional to the surface area |
|
(c) Directly proportional to the charge and inversely proportional to the surface area |
|
(d) Inversely proportional to the charge and the surface area |
For which of the following colour, the magnifying power of a microscope will be maximum
|
(a) White colour |
(b) Red colour |
(c) Violet colour |
(d) Yellow colour |
3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance
|
(a) 11.4 |
(b) 3.8 |
(c) 3 |
(d) None of these |
The kinetic energy of electron and proton is 
. Then the relation between their de-Broglie wavelengths is
|
(a) |
(b) |
(c) |
(d) |
Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current
|
(a) a |
(b) b |
(c) c |
(d) d |
The correct symbol for zener diode is
|
(a)
|
(b)
|
(c)
|
(d)
|
