Current provided by a battery is maximum when
|
(a) Internal resistance equal to external resistance |
|
(b) Internal resistance is greater than external resistance |
|
(c) Internal resistance is less than external resistance |
|
(d) None of these |
(a) Internal resistance equal to external resistance
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A capacitor is charged to 200 volt it has 0.1 coulomb charge. When it is discharged, energy will be
|
(a) 1 J |
(b) 4 J |
(c) 10 J |
(d) 20 J |
The time taken by sunlight to cross a 5 mm thick glass plate (μ = 3/2) is
|
(a) 0.25 |
(b) 0.167 |
(c) 2.5 |
(d) 1.0 |
In Young's double slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be
|
(a) 1 |
(b) 1/9 |
(c) 1/4 |
(d) 1/3 |
The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)
|
(a) |
(b) |
(c) |
(d) |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
→If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is
|
(a) 25 : 16 |
(b) 5 : 3 |
(c) 16 : 1 |
(d) 25 : 9 |
The resistance of a wire of iron is 10 ohms and temp. coefficient of resistivity is 5
. At 20
it carries 30 milliamperes of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120. The current in milliamperes that flows in the wire is
|
(a) 20 |
(b) 15 |
(c) 10 |
(d) 40 |
