The total charge of the universe is constant.
Explanation:
The total charge (Positive + negative) oif the universe is constant.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Mark the correct options:
Assertion : Anode of Coolidge tube gets heated up at time of emission of X-rays.
Reason : The anode of Coolidge tube is made of a material of high melting point.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Nuclear fusion is common to the pair
|
(a) Thermonuclear reactor, uranium based nuclear reactor |
|
(b) Energy production in sun, uranium based nuclear reactor |
|
(c) Energy production in sun, hydrogen bomb |
|
(d) Disintegration of heavy nuclei, hydrogen bomb |
In the figure a capacitor is filled with dielectrics. The resultant capacitance is
|
(a) |
(b) |
(c) |
(d) None of these |
In an atomic bomb, the energy is released due to
|
(a) Chain reaction of neutrons and |
|
(b) Chain reaction of neutrons and |
|
(c) Chain reaction of neutrons and |
|
(d) Chain reaction of neutrons and |
Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |
A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light:
Energy of the electron in nth orbit of hydrogen atom is given by 
. The amount of energy needed to transfer electron from first orbit to third orbit is
|
(a) 13.6 eV |
(b) 3.4 eV |
(c) 12.09 eV |
(d) 1.51 eV |
