- ABecomes neutral.
- BDoes not lose any charge.
- CLoses whole of the charge on it.
- DLoses part of the charge on it.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
|
(a) + 80 cm |
(b) – 80 cm |
(c) – 24 cm |
(d) –100 cm |
Resistance of 100 cm long potentiometer wire is 10 W, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is
|
(a) 490 W |
(b) 790 W |
(c) 590 W |
(d) 990 W |
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
|
(a) Yellow, orange, red |
(b) Violet, indigo, blue |
|
(c) All colours |
(d) All colours except green |
A metallic sheet is inserted between the plates of a parallel plate capacitor. The capacitance of the capacitor
|
(a) Increases |
|
(b) Is independent of the position of the sheet |
|
(c) Is maximum when the metal sheet in the middle |
|
(d) a, b |
$\text{I}_0$
$\frac{\text{I}_0}{4}$
$\frac{\text{I}_0}{2}$
$4\text{I}_0$
When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is
|
(a) 0.5 ohm |
(b) 1.0 ohm |
(c) 1.5 ohm |
(d) 2.0 ohm |
Two slits are separated by a distance of 0.5 mm and illuminated with light of λ = 6000 Å. If the screen is placed 2.5 m from the slits. The distance of the third bright image from the centre will be
|
(a) 1.5 mm |
(b) 3 mm |
(c) 6 mm |
(d) 9 mm |