Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |
(c) Both phase difference and frequency remains constant
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Work of electric motor is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) To convert ac into mechanical work |
The tangent galvanometer, when connected in series with a standard resistance can be used as
|
(a) An ammeter |
(b) A voltmeter |
|
(c) A wattmeter |
(d) Both an ammeter and a voltmeter |
The relaxation time in conductors
|
(a) Increases with the increase of temperature |
|
(b) Decreases with the increase of temperature |
|
(c) It does not depend on temperature |
|
(d) All of sudden changes at 400 K |
If a glass prism is dipped in water, its dispersive power:
Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be
|
(a) I1 + I2 |
(b) |
(c) (I1 + I2)2 |
(d) |
The frequency of a light ray is 6 
. Its frequency when it propagates in a medium of refractive index 1.5, will be
|
(a) 1.67 |
(b) 9.10 |
(c) 6 |
(d) 4 |
Which of the following is not the property of a cathode ray
|
(a) It casts shadow |
(b) It produces heating effect |
|
(c) It produces flurosence |
(d) It does not deflect in electric field |
On connecting a battery to the two corners of a diagonal of a square conductor frame of side a the magnitude of the magnetic field at the centre will be
|
(a) Zero |
(b) |
(c) |
(d) |
