- A[L T A].
- B[L-1 T A].
- C[L-1 T-1 A-1].
- DNone.
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Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red light.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A photon of wavelength 4400 Å is passing through vacuum. The effective mass and momentum of the photon are respectively
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(a) 5 |
(b) 5 |
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(c) Zero, 1.5 |
(d) 5 |
Which of the following statements are true regarding Bohr's model of hydrogen atom
(I) Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus
(II) Radii of allowed orbits of electron are proportional to the principal quantum number
(III) Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to the principal quantum number
(IV) Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits Select correct answer using the codes given below
Codes :
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(a) I and III |
(b) II and IV |
(c) I, II and III |
(d) II, III and IV |
The colour of the second line of Balmer series is
| (a) Blue | (b) Yellow |
(c) Red |
(d) Violet |
In the nth orbit, the energy of an electron
for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be
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(a) 10.2 eV |
(b) 12.1 eV |
(c) 13.6 eV |
(d) 3.4 eV |
An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of
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(a) Refraction |
(b) Reflection |
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(c) Total internal reflectionn |
(d) Dispersion |