Explanation:
Extremely high temps needed for fusion because K.E. should large enough to overcome repulsion between nuclei.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire
|
(a) Will be doubled |
(b) Will be halved |
|
(c) Will remain the same |
(d) Will be quadrupled |
Total flux produced by a source of 1 cd is
|
(a) |
(b) 8 |
(c) 4 |
(d) |
The focal length of a convex mirror is 20 cm its radius of curvature will be
|
(a) 10 cm |
(b) 20 cm |
(c) 30 cm |
(d) 40 cm |
A proton (mass m and charge +e) and an α - particle (mass 4m and charge +2e) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true
|
(a) The α - particle will be bent in a circular path with a small radius that for the proton |
|
(b) The radius of the path of the α - particle will be greater than that of the proton |
|
(c) The α - particle and the proton will be bent in a circular path with the same radius |
|
(d) The α - particle and the proton will go through the field in a straight line |
An electron enters between two horizontal plates separated by 2mm and having a potential difference of 1000V. The force on electron is
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
The transformation ratio in the step-up transformer is
|
(a) 1 |
|
(b) Greater than one |
|
(c) Less than one |
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(d) The ratio greater or less than one depends on the other factors |
