Atomic Spectra MCQs

Option A: Less than ordinary light

Option B: More than ordinary light

Option C: Equal to ordinary light

Option D: Different for different colours or frequency

Correct Answer: Equal to ordinary light ✔

Option A: Further stimulation

Option B: Lasing more

Option C: For producing more energetic lasers

Option D: All

Correct Answer: Further stimulation ✔

Option A: Ne only

Option B: He-Ne both

Option C: Electrons of He

Option D: Electrons Ne

Correct Answer: Ne only ✔

Option A: 10-4 sec

Option B: 10-5 sec

Option C: 10-3 sec

Option D: 10-8 sec

Correct Answer: 10-3 sec ✔

Option A: Metal stable state

Option B: Normal state

Option C: Inverted population

Option D: All the above

Correct Answer: Inverted population ✔

Option A: Stimulated

Option B: Absorbed

Option C: Cause X-ray emission

Option D: Cause laser production

Correct Answer: Absorbed ✔

Option A: It does emit radiation

Option B: Its size as compare to proton and neutron is very small

Option C: No antiparticle of electron is present

Option D: The velocity of electron must be very high according to uncertainty principle

Correct Answer: The velocity of electron must be very high according to uncertainty principle ✔

Option A: Line spectrum of atoms

Option B: Production of x-rays.

Option C: Diffraction by crystalline solids

Option D: Photoelectric effect

Correct Answer: Diffraction by crystalline solids ✔

Option A: Heating the filament

Option B: Electron excitation in the gas

Option C: Ionization of atoms

Option D: All the above

Correct Answer: Electron excitation in the gas ✔

Option A: The ions in a crystal are well arranged

Option B: The lines in a diffraction grating cannot reflect X-rays.

Option C: The penetration power of X-rays is high in a diffraction grating

Option D: The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

Correct Answer: The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal ✔

Option A: Number of incident electron i.e. filament current

Option B: The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated

Option C: The soft target which can easily emit electrons

Option D: All of above are correct

Correct Answer: The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated ✔

Option A: 6.2 x 10-10m

Option B: 9.1 x 10-18m

Option C: 3.11 x 10-10m

Option D: 4 x 10-10m

Correct Answer: 6.2 x 10-10m ✔

Option A: The illumination of the target metal by ultra-violet radiation

Option B: The bombardment of the target by protons

Option C: The bombardment of target by electrons

Option D: The absorption of radiation by the target metal

Correct Answer: The bombardment of target by electrons ✔

Option A: Reducing the pressure or cooling the target

Option B: Increasing the temperature of the filament.

Option C: Using a target element of higher atomic number

Option D: Increasing the potential difference between the cathode and the target

Correct Answer: Increasing the potential difference between the cathode and the target ✔

Option A: B-rays

Option B: X-rays

Option C: Far infrared

Option D: Infrared

Correct Answer: X-rays ✔

Option A: he/ev

Option B: he/Vc

Option C: eV/h

Option D: impossible to predict

Correct Answer: he/ev ✔

Option A: A & B

Option B: B & C

Option C: A & C

Option D: A B & C

Correct Answer: B & C ✔

Option A: increases

Option B: it decreases

Option C: it remains same

Option D: sometimes increases and sometimes decreases

Correct Answer: it remains same ✔

Option A: Cathode rays

Option B: Positive rays

Option C: γ-rays

Option D: Beta rays

Correct Answer: γ-rays ✔

Option A: γ-rays

Option B: Infra red radiation

Option C: Visible light

Option D: Ultraviolet rays

Correct Answer: γ-rays ✔

Option A: ultraviolet rays

Option B: X-rays

Option C: infra red radiation

Option D: visible radiation

Correct Answer: infra red radiation ✔

Option A: pair production

Option B: Compton effect

Option C: annihilation of matter

Option D: X-rays production

Correct Answer: X-rays production ✔

Option A: applied voltage

Option B: frequency

Option C: source

Option D: all of the above

Correct Answer: frequency ✔

Option A: 4th orbit

Option B: 5th orbit

Option C: 3rd orbit

Option D: 2nd orbit

Correct Answer: 4th orbit ✔

Option A: Ke2/rn

Option B: Ke2/rn2

Option C: ÀKe2/rn

Option D: ÀKe2/rn2

Correct Answer: Ke2/rn ✔

Option A: 13.60 eV

Option B: 3.40 eV

Option C: 0.85 eV

Option D: 1.51 eV

Correct Answer: 0.85 eV ✔

Option A: continuous spectra for atoms

Option B: discrete spectra for atoms

Option C: either continuous nor discrete

Option D: no spectrum

Correct Answer: continuous spectra for atoms ✔

Option A: radiate electromagnetic energy with a continuous distribution of wavelength

Option B: absorb particular wavelengths when white light is incident on them

Option C: radiate electromagnetic energy of discrete characteristic wavelength

Option D: emit either invisible or visible light

Correct Answer: radiate electromagnetic energy of discrete characteristic wavelength ✔

Option A: photo electric effect

Option B: ionization

Option C: shadow photograph

Option D: any of above

Correct Answer: shadow photograph ✔

Option A: 1st to 5th orbit

Option B: 2nd to 5th orbit

Option C: 3rd to 5th orbit

Option D: 4th to 5th orbit

Correct Answer: 1st to 5th orbit ✔

Option A: band spectrum

Option B: line spectrum

Option C: continuous spectrum

Option D: absorption spectrum

Correct Answer: line spectrum ✔

Option A: three

Option B: four

Option C: five

Option D: six

Correct Answer: five ✔

Option A: of unknown nature

Option B: high energy electrons

Option C: high energy photons

Option D: radio isotopes

Correct Answer: high energy photons ✔

Option A: its energy levels are too close to each other

Option B: its energy levels are too far apart

Option C: it is too small in size

Option D: it has a single electron

Correct Answer: it has a single electron ✔

Option A: 10-10s

Option B: 10-8s

Option C: 10-6s

Option D: 10-9s

Correct Answer: 10-8s ✔

Option A: Balmer series

Option B: Pfund series

Option C: Bracket series

Option D: Lymann series

Correct Answer: Lymann series ✔

Option A: 18.336

Option B: 1836

Option C: 18360

Option D: 183.6

Correct Answer: 1836 ✔