The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
(c) 45o
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In Thomson's method of determining e/m of electrons
|
(a) Electric and magnetic fields are parallel to electrons beam |
(b) Electric and magnetic fields are perpendicular to each other and perpendicular to electrons beam |
|
(c) Magnetic field is parallel to the electrons beam |
(d) Electric field is parallel to the electrons beam |
A movie projector forms an image 3.5m long of an object 35 mm. Supposing there is negligible absorption of light by aperture then illuminance on slide and screen will be in the ratio of
|
(a) 100 : 1 |
(b) 104 : 1 |
(c) 1 : 100 |
(d) 1 : 104 |
In a triode amplifier, the value of maximum gain is equal to
|
(a) Half the amplification factor |
(b) Amplification factor |
|
(c) Twice the amplification factor |
(d) Infinity |
In a magnetic field of 0.05T, area of a coil changes from
to
without changing the resistance which is 2W. The amount of charge that flow during this period is
|
(a) 2.5 |
(b) 2 |
|
(c) |
(d) |
When a magnetic substance is heated, then it
|
(a) Becomes a strong magnet |
(b) Losses its magnetism |
|
(c) Does not effect the magnetism |
(d) Either (a) or (c) |
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young’s double slit experiment, fringe width is given by relation B =
|
(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 variation of wavelength λ of the
line with atomic number Z of the target is shown by the following curve of

|
(a) A |
(b) B |
(c) C |
(d) None of these |