- AFerromagnetic material.
- BParamagnetic material.
- CDiamagnetic material.
- DNone of these options.
Explanation:
Ferromagnetic materials display higher magnetic susceptibility.
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Consider a binary star system consisting of two stars of masses and
separated by a distance of 30 AU with a period of revolution equal to 30 years. If one of the two stars is 5 times farther from the centre of mass than the other. The masses of the two stars in terms of solar masses are
|
(a) 5, 15 |
(b) 25, 5 |
(c) 25, 10 |
(d) 7, 25 |
A ray of light travels from a denser to a rarer medium then, the ray:
Boron rods in nuclear reactor are used as a
|
(a) Moderator |
(b) Control rods |
(c) Coolants |
(d) Protective shield |
The ratio of momenta of an electron and an α- particle which are accelerated from rest by a potential difference of 100 V is
|
(a) 1 |
(b) |
(c) |
(d) |
You are given a resistance wire of length 50 cm and a battery of negligible resistance. In which of the following cases is largest amount of heat generated
|
(a) When the wire is connected to the battery directly |
|
(b) When the wire is divided into two parts and both the parts connected to the battery in parallel |
|
(c) When the wire is divided into four parts and all the four connected to the battery in parallel |
|
(d) When only half the wire is connected to the battery |
$1$
$2$
$\sqrt{2}$
$\frac{1}{\sqrt{2}}.$
