Which statement is correct
|
(a) N-type germanium is negatively charged and P-type germanium is positively charged |
|
(b) Both N-type and P-type germanium are neutral |
|
(c) N-type germanium is positively charged and P-type germanium is negatively charged |
|
(d) Both N-type and P-type germanium are negatively charged |
(b) Both N-type and P-type germanium are neutral
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According to Bohr's model, the radius of the second orbit of helium atom is
|
(a) 0.53 Å |
(b) 1.06 Å |
(c) 2.12 Å |
(d) 0.265 Å |
In the circuit shown, the point ‘B’ is earthed. The potential at the point ‘A’ is
|
(a) 14 V |
(b) 24 V |
(c) 26 V |
(d) 50 V |
64 small drops of mercury, each of radius r and charge q coalesce to form a big drop. The ratio of the surface density of charge of each small drop with that of the big drop is
|
(a) 1 : 64 |
(b) 64 : 1 |
(c) 4 : 1 |
(d) 1 : 4 |
Three charges Q(+q) and (+q) are placed at the vertices of an equilateral triangle of side l as shown in the figure. If the net electrostatic energy of the system is zero, then Q is equal to
|
(a) |
(b) (-q) |
(c) (+q) |
(d) Zero |
Absorption of X-ray is maximum in which of the following different sheets
|
(a) Copper |
(b) Gold |
(c) Beryllium |
(d) Lead |
An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)
|
(a) 4 |
(b) 4 |
(c) |
(d) Zero |
