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 charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 
, the charge on it and excess number of electrons on the particle are respectively (g = 
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
In Millikan oil drop experiment, a charged drop of mass 1.8 
is stationary between its plates. The distance between its plates is 0.90 cm and potential difference is 2.0 kilo volts. The number of electrons on the drop is
|
(a) 500 |
(b) 50 |
(c) 5 |
(d) 0 |
When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then
|
(a) No electrons are emitted |
|
(b) Photons are emitted |
|
(c) Electrons of higher energy are emitted |
|
(d) Electrons of lower energy are emitted |
Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is
|
(a) |
(b) |
(c) Zero |
(d) |
A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then
|
(a) N ∝ L and E ∝ L |
(b) N ∝ L and E ∝ |
|
(c) N ∝ |
(d) N ∝ |
If the mass number of an atom is A = 40 and its electron configuration is 
, the number of neutrons and protons in its nucleus will be
| (a) 22, 18 | (b) 18, 22 |
(c) 20, 20 |
(d) 18, 18 |
