- AControlled chain reaction
- BUncontrolled chain reaction
- CNuclear fusion
- DNuclear fission
Explanation:
Hydrogen bomb is based on nuclear fusion. A large amount of nuclear energy is released by fusion of two light elements (elements with low atomic numbers).
In a hydrogen bomb, two isotopes of hydrogen, deuterium(1 proton, 1 neutron) and tritium(1 proton, 2 neutron) are fused to form a nucleus of helium and a neutron.
This fusion releases 17.6 MeV of energy. Also, there is no limit on the amount of the fusion that can occur.
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The radius of the convex surface of plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is
|
(a) 30 cm |
(b) 50 cm |
(c) 20 cm |
(d) 40 cm |
A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object when the image is virtual will be
|
(a) 22.5 cm |
(b) 7.5 cm |
(c) 30 cm |
(d) 45 cm |
Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is
|
(a) 10 ohm |
(b) 40 ohm |
(c) 20 ohm |
(d) 10/4 ohm |
A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) Antiferromagnetic |
An X-ray tube with a copper target emits Cu
line of wavelength 1.50 Å. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays (h = 6.63 ![]()
|
(a) 8280 V |
(b) 828 V |
(c) 82800 V |
(d) 8.28 V |
If aperture of lens is halved then image will be
|
(a) No effect on size |
(b) Intensity of image decreases |
|
(c) Both (a) and (b) |
(d) None of these |
The temperature at which thermal electric power of a thermo couple becomes zero is called
|
(a) Inversion temperature |
(b) Neutral temperature |
|
(c) Junction temperature |
(d) Null temperature |