When two identical capacitors are in series have 3mF capacitance and when parallel 12mF. What is the capacitance of each
|
(a) 6 μF |
(b) 3 μF |
(c) 12 μF |
(d) 9 μF |
(a) 6 μF
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Assertion : In Millikan's experiment for the determination of charge on an electron, oil drops of any size can be used.
Reason : Millikan's experiment determine the charge on electron, by simply measuring the terminal velocity.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(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 assertion is false but reason is true. |
An alpha particle is accelerated through a potential difference of 
. Its kinetic energy will be
|
(a) 1 MeV |
(b) 2 MeV |
(c) 4 MeV |
(d) 8 MeV |
An electric fan and a heater are marked as 100 watt, 220 volt and 1000 watt, 220 volt respectively. The resistance of the heater is
|
(a) Zero |
(b) Greater than that of the fan |
|
(c) Less than that of the fan |
(d) Equal to that of the fan |
In a Young’s double slit experiment, the separation of the two slits is doubled. To keep the same spacing of fringes, the distance D of the screen from the slits should be made
|
(a) |
(b) |
(c) 2D |
(d) 4D |
A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
|
(a) 1600 cm2 |
(b) 400 cm2 |
(c) 800 cm2 |
(d) 200 cm2 |
Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by
|
(a) |
(b) |
(c) |
(d) |
