- AIsothermals
- BIsotopes
- CIsotropics
- DElementary particles
Explanation:
Isotopes are atoms of the same element having the same numbers of protons, but different numbers of neutrons. They have same chemical properties due to the same electronic configuration but different physical properties.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The energy in MeV is released due to transformation of 1 kg mass completely into energy (c = 3
| (a) 7.625 ×10 MeV |
(b) 10.5 |
(c) 2.8 |
(d) 5.625 |
A capacitor of capacity C has charge Q and stored energy is W. If the charge is increased to 2Q, the stored energy will be
|
(a) 2W |
(b) W/2 |
(c) 4W |
(d) W/4 |
The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to
|
(a) h1/2 |
(b) h |
(c) h3/2 |
(d) h2 |
Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of V volts. The charge on plates 1 and 4 will be
|
(a) |
(b) |
(c) |
(d) |
The work functions of metals A and B are in the ratio 1 : 2. If light of frequencies f and 2f are incident on the surfaces of A and B respectively, the ratio of the maximum kinetic energies of photoelectrons emitted is (f is greater than threshold frequency of A, 2f is greater than threshold frequency of B)
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 1 : 3 |
(d) 1 : 4 |
In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å
| (a) 10 kV | (b) 20 kV | (c) 30 kV | (d) 40 kV |
Wavelength of a 1 keV photon is
. What is the frequency of 1 MeV photon
|
(a) 1.24 |
(b) 2.4 |
(c) 1.24 |
(d) 2.4 |
A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r from its centre
|
(a) Increases as r increases for r < R |
(b) Decreases as r increases for 0 < r < ∞ |
|
(c) Decreases as r increases for R < r < ∞ |
(d) a, c |