- Ais filled with dielectric material
- Bby reducing, the area of the plates is increased
- ✓by increasing, the area of the plates is reduced
- Dalso increases and also increases the area
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is
|
(a) 4.58 eV |
(b) 2.28 eV |
(c) 1.14 eV |
(d) 0.23 eV |
The maximum current that can be measured by a galvanometer of resistance 40 W is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)
|
(a) 5040 |
(b) 4960 |
(c) 2010 |
(d) 4050 |
A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then
|
(a) The reflected ray rotates through an angle 2θ |
| (b) The incident ray is fixed |
| (c) The reflected ray does not rotate |
| (d) a, b |
A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2W. Two resistance of 6W and 3W are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is

|
(a) 6 N |
(b) 4 N |
(c) 2 N |
(d) 1 N |
The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of
then
is

|
(a) 5 V |
(b) 10 V |
(c) 15 V |
(d) 20 V |
A parallel plate capacitor of area A, plate separation d and capacitance C is filled with three different dielectric materials having dielectric constants and
as shown. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by
|
(a) |
(b) |
|
(c) k = |
(d) |
The following configuration of gate is equivalent to
|
(a) NAND |
(b) XOR |
(c) OR |
(d) None of these |
Assertion : The quantity L/R possesses dimensions of time.
Reason : To reduce the rate of increases of current through a solenoid should increase the time constant (L/R).
|
(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. |
|
(d) If the assertion and reason both are false. |