The path executed by a charged particle whose motion is perpendicular to magnetic field i
|
(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
(c) A circle
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A star emitting light of wavelength 5896 Å is moving away from the earth with a speed of 3600 km /sec. The wavelength of light observed on earth will (c = 3 
is the speed of light)
|
(a) Decrease by 5825.25 Å |
(b) Increase by 5966.75 Å |
|
(c) Decrease by 70.75 Å |
(d) Increase by 70.75 Å |
In the circuit shown below the resistance of the galvanometer is 20 W. In which case of the following alternatives are the currents arranged strictly in the decreasing order
|
(a) i, i1, i2, ig |
(b) i, i2, i1, ig |
(c) i, i2, ig, i1 |
(d) i, i1, ig, i2 |
Assertion : For best contrast between maxima and minima in the interference pattern of Young’s double slit experiment, the intensity of light emerging out of the two slits should be equal.
Reason : The intensity of interference pattern is proportional to square of amplitude.
|
(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. |
The reverse biasing in a PN junction diode
| (a) Decreases the potential barrier |
|
(b) Increases the potential barrier |
|
(c) Increases the number of minority charge carriers |
|
(d) Increases the number of majority charge carriers |
A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is
(a)
|
(b)
|
(c)
|
(d)
|
The radius of the orbital of electron in the hydrogen atom 0.5 Å. The speed of the electron is 2 
. Then the current in the loop due to the motion of the electron is
|
(a) 1 mA |
(b) 1.5 mA |
(c) 2.5 mA |
(d) 1.5 |
The triode constant is out of the following
|
(a) Plate resistance |
(b) Amplification factor |
(c) Mutual conductance |
(d) All the above |
