If the distance between a point source and screen is doubled, then intensity of light on the screen will become
|
(a) Four times |
(b) Double |
(c) Half |
(d) One-fourth |
(d) One-fourth
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The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer. The relation 
will be satisfied only when
|
(a) The galvanometer shows a deflection when switch S is closed |
|
(b) The galvanometer shows a deflection when switch S is open |
|
(c) The galvanometer shows no change in deflection whether S is open or closed |
|
(d) The galvanometer shows no deflection |
A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then
|
(a) The charge on the capacitor increases |
|
(b) The voltage across the plates decreases |
|
(c) The capacitance increases |
|
(d) The electrostatic energy stored in the capacitor increases |
The equivalent capacitance of three capacitors of capacitance 
and 
are connected in parallel is 12 units and product 
. When the capacitors 
and 
are connected in parallel, the equivalent capacitance is 6 units. Then the capacitance are
|
(a) 2, 3, 7 |
(b) 1.5, 2.5, 8 |
(c) 1, 5, 6 |
(d) 4, 2, 6 |
The magnetic flux linked with a vector area 
in a uniform magnetic field 
is
|
(a) |
(b) AB |
(c) |
(d) |
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.
The extreme wavelengths of Paschen series are
|
(a) 0.365 μm and 0.565 μm |
(b) 0.818 μm and 1.89 μm |
|
(c) 1.45 μm and 4.04 μm |
(d) 2.27 μm and 7.43 μm |
