- ANuclear fission
- BNuclear fusion
- CNuclear fission & fusion
- DNuclear decay
Explanation:
Stellar and solar energy is due to fusion reactions. So, source of stellar energy is Nuclear fusion.
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By Huygen's wave theory of light, we cannot explain the phenomenon of
|
(a) Interference |
(b) Diffraction |
(c) Photoelectric effect |
(d) Polarisation |
What is immaterial for an electric fuse wire
|
(a) Specific resistance of the wire |
(b) Radius of the wire |
|
(c) Length of the wire |
(d) Current flowing through the wire |
A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is
|
(a) 4.4 |
(b) 2.2 |
|
(c) 1.1 |
(d) 0.22 |
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images. If the heights of the images are 4 cm and 9 cm respectively, the height of the object is
|
(a) 2.25 cm |
(b) 6.00 cm |
(c) 6.50 cm |
(d) 36.00 cm |
Donor type impurity is found in
|
(a) Trivalent elements |
(b) Pentavalent elements |
|
(c) In both the above |
(d) None of these |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like

A source of e.m.f. E = 15 V and having negligible internal resistance is connected to a variable resistance so that the current in the circuit increases with time as i = 1.2 t + 3. Then, the total charge that will flow in first five second will be
|
(a) 10 C |
(b) 20 C |
(c) 30 C |
(d) 40 C |