- ADalton’s theory, Rutherford model.
- BRutherford’s model, Bohr’s model.
- CThomson’s model, Rutherford’s model.
- DRutherford’s model, Thomson’s model.
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The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is
, the value of λ for tungsten is
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(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
According to corpuscular theory of light, the different colours of light are due to
|
(a) Different electromagnetic waves |
|
(b) Different force of attraction among the corpuscles |
|
(c) Different size of the corpuscles |
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(d) None of the above |
Two non-ideal identical batteries are connected in parallel. Consider the following statements
(i) The equivalent e.m.f. is smaller than either of the two e.m.f.s
(ii) The equivalent internal resistance is smaller than either of the two internal resistances
|
(a) Both (i) and (ii) are correct |
(b) (i) is correct but (ii) is wrong |
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(c) (ii) is correct but (i) is wrong |
(d) Both (i) and (ii) are wrong |
Donor type impurity is found in
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(a) Trivalent elements |
(b) Pentavalent elements |
|
(c) In both the above |
(d) None of these |
A man is looking at a small object placed at his near point. Without altering the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is:
Curie-Weiss law is obeyed by iron at a temperature ......
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(a) Below Curie temperature |
(b) Above Curie temperature |
|
(c) At Curie temperature only |
(d) At all temperatures |