- AC
- BC/ m
- CC/ m2
- DC/ m3
Explanation:
Surface charge density means how much charge is stored in the unit surface area of a conductor.
So, it’s unit will be$=\frac{\text{the unit of the charge}}{\text{the unit of area}}$. In SI the unit of charge is Coulomb and the unit of area is m2.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A magnet when placed perpendicular to a uniform field of strength
experiences a maximum couple of moment 4
. What is its magnetic moment
|
(a) 0.4 |
(b) 0.2 |
(c) 0.16 |
(d) 0.04 |
In the disintegration series
The value of Z and A respectively will be
|
(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
An electric wire is connected across a cell of e.m.f. E. The current I is measured by an ammeter of resistance R. According to ohm's law
|
(a) |
(b) E = IR |
(c) E = R/I |
(d) E = I/R |
The resistance of a galvanometer is 50 ohms and the current required to give full scale deflection is 100μA. In order to convert it into an ammeter, reading upto 10A, it is necessary to put a resistance of
|
(a) 5 |
(b) 5 |
|
(c) |
(d) 99,950 |
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then
|
(a) Number of electrons emitted is half the initial number |
|
(b) Each emitted electron carries half the initial energy |
|
(c) Number of electrons emitted is a quarter of the initial number |
|
(d) Each emitted electron carries one quarter of the initial energy |
The intensity distribution of X-rays from two coolidge tubes operated on different voltages V1 and V2 and using different target materials of atomic numbers Z1 and Z2 is shown in the figure. Which one of the following inequalities is true?

|
(a) V1 > V2, Z1 < Z2 |
(b) V1 > V2, Z1 > Z2 |
(c) V1 < V2, Z1 > Z2 |
(d) V1 = V2, Z1 < Z2 |
A star is moving towards the earth with a speed of 4.5 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 Å, its apparent wavelength will be about [c = 3
]
|
(a) 5890 Å |
(b) 5978 Å |
(c) 5802 Å |
(d) 5896 Å |