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Q.1: Michelson calculated the speed of light using the instruments——-?
- none of these
Q.2: Ratio of the weight of H-atom to that of an electron is approximately——-?
Q.3: In hydrogen spectrum which one of the following series lies in the ultraviolet region ?
- Balmer series
- Pfund series
- Bracket series
- Lymann series
Q.4: Excited atoms return to their ground state in——–?
Q.5: Hydrogen atom does not emit X-rays because ———?
- its energy levels are too close to each other
- its energy levels are too far apart
- it is too small in size
- it has a single electron
Q.6: X-ray are——–?
- of unknown nature
- high energy electrons
- high energy photons
- radio isotopes
Q.7: Total number of series in hydrogen spectrum is——-?
Q.8: The radiations emitted form hydrogen filled discharge tube show——?
- band spectrum
- line spectrum
- continuous spectrum
- absorption spectrum
Q.9: Photon of highest frequency will be absorbed when transition takes place from——-?
- 1st to 5th orbit
- 2nd to 5th orbit
- 3rd to 5th orbit
- 4th to 5th orbit
Q.10: In obtaining an X-ray photograph of our hand we use the principle of——-?
- photo electric effect
- shadow photograph
- any of above