Two parallel pillars are 11 km away from an observer. The minimum distance between the pillars so that they can be seen separately will be
|
(a) 3.2 m |
(b) 20.8 m |
(c) 91.5 m |
(d) 183 m |
(a) 3.2 m
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The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately
|
(a) 28 MHz |
(b) 280 MHz |
(c) 2.8 GHz |
(d) 28 GHz |
The maximum illumination on a screen at a distance of 2 m from a lamp is 25 lux. The value of total luminous flux emitted by the lamp is
|
(a) 1256 lumen |
(b) 1600 lumen |
(c) 100 candela |
(d) 400 lumen |
In the Wheatstone's bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be
|
(a) From a to b |
(b) From b to a |
|
(c) From b to a through c |
(d) From a to b through c |
Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien's law
|
(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. |
Which of the following has a negative temperature coefficient
|
(a) C |
(b) Fe |
(c) Mn |
(d) Ag |
The expression for magnetic induction inside a solenoid of length L carrying a current I and having N number of turns is
|
(a) |
(b) |
(c) |
(d) |
