A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
|
(a) Green colour glasses |
(b) Red colour glasses |
|
(c) Smoky colour glasses |
(d) None of the above |
(d) None of the above
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A thick wire is stretched so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 3 : 1 |
(d) 1 : 4 |
An expression for rate of heat generated, if a current of I ampere flows through a resistance of R W, is
|
(a) |
(b) |
(c) |
(d) IR |
A curve between magnetic moment and temperature of magnet is
|
(a)
|
(b)
|
(c)
|
(d)
|
If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will
| (a) Become half |
(b) Become one-fourth |
(c) Remain unchanged | (d) Become double |
In which of the following remote sensing technique is not used
|
(a) Forest density |
(b) Pollution |
(c) Wetland mapping |
(d) Medical treatment |
Which statement is correct
|
(a) N-type germanium is negatively charged and P-type germanium is positively charged |
|
(b) Both N-type and P-type germanium are neutral |
|
(c) N-type germanium is positively charged and P-type germanium is negatively charged |
|
(d) Both N-type and P-type germanium are negatively charged |
A P-type semiconductor has acceptor levels 57 meV above the valence band. The maximum wavelength of light required to create a hole is (Planck’s constant h = 6.6 
J-s)
|
(a) 57 |
(b) 57 |
(c) 217100 |
(d) 11.61 |
The explosion of the atomic bomb takes place due to
|
(a) Nuclear fission |
(b) Nuclear fusion |
|
(c) Scattering |
(d) Thermionic emission |
