Three equal capacitors, each with capacitance C are connected as shown in figure. Then the equivalent capacitance between A and B is
|
(a) C |
(b) 3C |
(c) |
(d) |
(b) 3C
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A parallel plate capacitor has a capacity C. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes 2C, the dielectric constant of the medium is
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(a) 2 |
(b) 1 |
(c) 4 |
(d) 8 |
Two bulbs of equal wattage, one having carbon filament and the other having a tungsten filament are connected in series to the mains, then
|
(a) Both bulbs glow equally |
(b) Carbon filament bulb glows more |
|
(c) Tungsten filament bulbs glows more |
(d) Carbon filament bulb glows less |
There is no couple acting when two bar magnets are placed coaxially separated by a distance because
|
(a) There are no forces on the poles |
|
(b) The forces are parallel and their lines of action do not coincide |
|
(c) The forces are perpendicular to each other |
|
(d) The forces act along the same line |
Which of the following would you prefer to use while reading small letters found in a dictionary?
A 500 W heating unit is designed to operate from a 115 volt line. If the line voltage drops to 110 volt, the percentage drop in heat output will be
|
(a) 10.20% |
(b) 8.1% |
(c) 8.6% |
(d) 7.6% |
Ten capacitor are joined in parallel and charged with a battery up to a potential V. They are then disconnected from battery and joined again in series then the potential of this combination will be
|
(a) V |
(b) 10V |
(c) 5V |
(d) 2V |
Which of the following energy band diagram shows the N-type semiconductor
|
(a)
|
(b)
|
(c)
|
(d) |
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