The maximum current that flows through a fuse wire before it blows out varies with its radius as
|
(a) |
(b) r |
(c) |
(d) |
The maximum current that flows through a fuse wire before it blows out varies with its radius as
|
(a) |
(b) r |
(c) |
(d) |
(a)
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The energy of electron in the nth orbit of hydrogen atom is expressed as
. The shortest and longest wavelength of Lyman series will be
| (a) 910 Å, 1213 Å | (b) 5463 Å, 7858 Å | (c) 1315 Å, 1530 Å | (d) None of these |
Figure represents the graph of photo current I versus applied voltage (V). The maximum energy of the emitted photoelectrons is

|
(a) 2eV |
(b) 4 eV |
(c) 0 eV |
(d) 4 J |
Assertion : The earth’s magnetic field does not affect the working of a moving coil galvanometer.
Reason : Earth’s magnetic field is very weak.
|
(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. |
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(d) If the assertion and reason both are false. |
In the given figure, when key K is opened, the reading of the ammeter A will be
|
(a) 50 A |
(b) 2 A |
(c) 0.5 A |
(d) |
$\text{y}=(0.001\text{mm})\sin\Big[(50\text{s}^{-1})\text{t}+(2.0\text{m}^{-1})\text{x}\Big]$
The electrical circuit used to get smooth dc output from a rectifier circuit is called
| (a) Oscillator | (b) Filter | (c) Amplifier | (d) Logic gates |
A fuse wire with radius 1 mm blows at 1.5 amp. The radius of the fuse wire of the same material to blow at 3A will be
|
(a) |
(b) |
(c) |
(d) |