- A11 Electrons, 11 protons and 13 neutrons.
- B11 Electrons, 13 protons and 11 neutrons.
- C11 Protons and 13 neutrons.
- D11 Protons and 13 electrons.
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The radius of a nucleus of a mass number A is directly proportional to
|
(a) |
(b) A |
(c) |
(d) |
A spherical surface of radius of curvature R separates air (refractive index 1.0) from glass (refractive index 1.5). The centre of curvature is in the glass. A point object P placed in air is found to have a real image Q in the glass. The line PQ cuts the surface at a point O, and PO = OQ. The distance PO is equal to
|
(a) 5 R |
(b) 3 R |
(c) 2 R |
(d) 1.5 R |
In Young’s double slit experiment the amplitudes of two sources are 3a and a respectively. The ratio of intensities of bright and dark fringes will be
|
(a) 3 : 1 |
(b) 4 : 1 |
(c) 2 : 1 |
(d) 9 : 1 |
Which is not true with respect to the cathode rays
|
(a) A stream of electrons |
(b) Charged particles |
|
(c) Move with speed same as that of light |
(d) Can be deflected by magnetic fields |
The voltage applied across an X-rays tube is nearly
| (a) 10 V | (b) 100 V | (c) 10000 V | (d) 106 V |
The mutual inductance of an induction coil is 5H. In the primary coil, the current reduces from 5A to zero in
. What is the induced emf in the secondary coil
|
(a) 2500 V |
(b) 25000V |
(c) 2510V |
(d) Zero |
