- AMagnetic moment of each molecule is zero.
- BThe individual molecules have non-zero magnetic moment which are all perfectly aligned.
- CDomains are partially aligned.
- DDomains are all perfectly aligned.
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Molybdenum is used as a target element for production of X-rays because it is
|
(a) A heavy element and can easily absorb high velocity electrons |
| (b) A heavy element with a high melting point |
|
(c) An element having high thermal conductivity |
|
(d) Heavy and can easily deflect electrons |
A calcite crystal is placed over a dot on a piece of paper and rotated, on seeing through the calcite one will be see
|
(a) One dot |
(b) Two stationary dots |
|
(c) Two rotating dots |
(d) One dot rotating about the other |
The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature
|
(a) Decreases exponentially with increasing band gap |
|
(b) Increases exponentially with increasing band gap |
|
(c) Decreases with increasing temperature |
|
(d) Is independent of the temperature and the band gap |
A convex lens
|
(a) Converges light rays |
(b) Diverges light rays |
|
(c) Form real images always |
(d) Always forms virtual images |
