A semiconductor is cooled from 
to 
Its resistance
|
(a) Will decrease |
|
(b) Will increase |
|
(c) Will first decrease and then increase |
|
(d) Will not change |
(b) Will increase
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Energy of 1g uranium is equal to
|
(a) 9.0 |
(b) 9.0 |
(c) 3.0 |
(d) 3.0 |
In Cu-Fe couple, the flow of current at the temperature of inversion is
|
(a) From Fe to Cu through the hot junction |
|
(b) From Cu to Fe through the hot junction |
|
(c) Maximum |
|
(d) None of the above |
Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil.
Reason : Current through galvanometer is proportional to the number of turns of coil.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. In response, the loop-B
|
(a) Remains stationary |
|
(b) Is attracted by the loop-A |
|
(c) Is repelled by the loop-A |
|
(d) Rotates about its CM, with CM fixed |
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
|
(a) |
(b) |
(c) |
(d) |
X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true
|
(a) In general X-rays have larger wavelength than of gamma rays |
|
(b) X-rays have smaller wavelength than that of gamma rays |
|
(c) Gamma rays have smaller frequency than that of X-rays |
|
(d) Wavelength and frequency of X-rays are both larger than that of gamma rays |
The wavelength of Lyman series is
|
(a) |
(b) |
(c) |
(d) |
