Explanation:
Isotopes of the same element must have same number of protons but different number of neutrons.
Also the isotopes of same element are located at same place in the periodic table and undergo same chemical reaction.
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Two identical thin rings each of radius R meters are coaxially placed at a distance R meters apart. If Q1 coulomb and Q2 coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge qfrom the centre of one ring to that of other is
|
(a) Zero |
(b) |
(c) |
(d) |
In the figure shown, for an angle of incidence 45°, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face
|
(a) |
(b) |
(c) |
(d) |
The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by
|
(a) mge |
(b) |
(c) |
(d) |
The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be
|
(a) 1.8 cm |
(b) 1.5 cm |
(c) 2.1 cm |
(d) 2.4 cm |
The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to
|
(a) n |
(b) |
(c) |
(d) |
As compared 12C atom, 14C atom has
|
(a) Two extra protons and two extra electrons |
|
(b) Two extra protons but no extra electrons |
|
(c) Two extra neutrons and no extra electrons |
|
(d) Two extra neutrons and two extra electrons |
The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates, is
|
(a) |
(b) |
(c) |
(d) |
