- AThe fission of helium
- BChemical reactoin
- CFusion of hydrogen nuclei
- DBurning of carbon
Explanation:
The Sun produces energy by the nuclear fusion of hydrogen into helium in its core.
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In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be
| (a) 4 : 1 | (b) 1 : 2 | (c) 2 : 1 | (d) 1 : 8 |
If two conducting spheres are separately charged and then brought in contact
|
(a) The total energy of the two spheres is conserved |
|
(b) The total charge on the two spheres is conserved |
|
(c) Both the total energy and charge are conserved |
|
(d) The final potential is always the mean of the original potentials of the two spheres |
As shown in the figure, a magnet is moved with a fast speed towards a coil at rest. Due to this induced electromotive force, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is

|
(a) E increases |
(b) I increases |
(c) Q remains same |
(d) Q increases |
A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to
|
(a) sin θ |
(b) tan θ |
(c) cos θ |
(c) cos θ |
When original mass of star is greater than 5 M (M = mass of the sun). The death of this star will give rise to
|
(a) White dwarf |
(b) Black hole |
(c) Quasars |
(d) Nebula |
On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is
|
(a) |
(b) |
(c) |
(d) |
The resistance of a conductor increases with
|
(a) Increase in length |
(b) Increase in temperature |
|
(c) Decrease in cross–sectional area |
(d) All of these |