A ferromagnetic material is heated above its curie temperature. Which one is a correct statement
| (a) Ferromagnetic domains are perfectly arranged |
| (b) Ferromagnetic domains becomes random |
| (c) Ferromagnetic domains are not influenced |
| (d) Ferromagnetic material changes itself into diamagnetic material |
(b) Ferromagnetic domains becomes random
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If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction
|
(a) 2/3 |
(b) 4/9 |
(c) 3/4 |
(d) 5/9 |
Assertion : Radioactive nuclei emit 
particles.
Reason : Electrons exist inside the nucleus.
|
(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. |
For a real object, which of the following can produced a real image
|
(a) Plane mirror |
(b) Concave lens |
(c) Convex mirror |
(d) Concave mirror |
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
|
(a) 4h, 9000 |
(b) 3h, 14000 |
(c) 3h, 235 |
(d) 3h, 50 |