Free Atomic Spectra MCQs with Answers
356 Atomic Spectra MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atoms emit or absorb light at specific wavelengths because electrons occupy quantized energy levels and change levels by absorbing or releasing photons. The topic covers emission and absorption spectra, spectral series, hydrogen’s line spectrum, energy-level transitions, and the relation between wavelength, frequency and photon energy.
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Read the Atomic Spectra notesFree MDCAT chapter notes with key terms356 questions · page 9 of 18
- A. Both inner and outer shell
- B. Inner shell
- C. None of these
- D. Outer shell
Explanation: X-rays are high-frequency electromagnetic radiations that are produced when accelerated electrons strike the target material and cause the…
Correct answer: Inner shell- A. Electromagnetic radiation
- B. Black body radiation
- C. Alpha rays
- D. Beta rays
Explanation: LASER stands for Light Amplification by Stimulated Emission of Radiation.
Correct answer: Electromagnetic radiation- A. He
- B. H
- C. Cu
- D. Na
Explanation: X-ray photons are produced when electrons in the outermost shells of an atom drop to the inner shells.
Correct answer: Cu- A. Alpha rays
- B. Cosmic rays
- C. Gamma rays
- D. Beta rays
Explanation: Extraterrestrial or cosmic rays are protons and atomic nuclei moving at the speed of light, originating from outside our solar system.
Correct answer: Cosmic rays- A. Photons
- B. All of these
- C. Electrons
- D. Protons
Explanation: Characteristic x-rays are radiations "characteristic" of a particular material.
Correct answer: Electrons- A. Frequency
- B. Wavelength
- C. Amplitude
- D. Both A and B
Explanation: The penetrating power of X-rays depends on both the frequency and the wavelength.
Correct answer: Both A and B- A. mirror
- B. crystal
- C. gas molecules
- D. all of these
Explanation: X-rays are diffracted from crystals because of their regularly arranged atoms or ions in a lattice structure.
Correct answer: crystal- A. Inverted
- B. Real
- C. Any of A or B
- D. Virtual
Explanation: The image of absorbed X-rays can be inverted, real, and magnified or diminished.
Correct answer: Any of A or B- A. In any general state with lower energy
- B. In any state when excited by electric field
- C. In any state when excited by magnetic field
- D. None of these options are correct
Explanation: As we know, atoms are stable in the ground state, when they move to another level by gaining energy, they get excited and are ready to…
Correct answer: In any general state with lower energy- A. Increasing temperature
- B. Decreasing pressure
- C. Increasing PD of electrodes
- D. None of these options are correct
Explanation: The wavelength of produced X-rays depends on the energy of electrons in the X-ray tube, which depends on the potential difference between…
Correct answer: Increasing PD of electrodes171. Laser light is:
- A. Multi-directional
- B. Bi-directional
- C. Uni-directional
- D. None of these options is correct
Explanation: Uni-directional can refer to a force, a wave, or a current that only flows in one direction.
Correct answer: Uni-directional- A. Stimulated emission
- B. Spontaneous emission
- C. Absorption
- D. All of these options are correct
Explanation: In laser action the stimulating emission triggers a chain reaction in which the radiation from one atom stimulates another in succession…
Correct answer: Stimulated emission- A. 10-8s
- B. 10-9s
- C. 3 ns
- D. All of these options are correct
Explanation: Excited atoms typically return to their ground state in about 10-8s. This is a common timescale for atomic transitions due to the nature…
Correct answer: 10-8s- A. Balmer
- B. Pfund
- C. Paschen
- D. None of these options is correct
Explanation: Bracket series is obtained when all transition of electron terminates on 4th orbit.Option A; balmer series is obtained when all transition…
Correct answer: None of these options is correct- A. Absorption
- B. Emission
- C. Release
- D. Free particle
Explanation: OPTION A: The spectrum produced from the radiations from which the rays of a particular wavelength are absorbed after passing through the…
Correct answer: Absorption- A. Continuous
- B. Discrete
- C. Both options A and B
- D. None of these options are correct
Explanation: OPTION A: Black body radiation is an example of continuous spectra. OPTION B: When an atomic gas or vapor at much less than atmospheric…
Correct answer: Discrete- A. Band spectra
- B. Line spectra
- C. Emission spectra
- D. Absorption spectra
Explanation: Option A : Spectra corresponding to sodium vapour lamp is not band spectra.
Correct answer: Emission spectra- A. Electric fibre
- B. Neon street sign
- C. Red traffic light
- D. Sun
Explanation: Neon signs emit light at specific wavelengths due to the atomic transitions in neon gas.
Correct answer: Neon street sign- A. Photon
- B. Proton
- C. Electron
- D. None of these
Explanation: This option is correct because x- rays are produced by bombarding electrons on the anode, in which the collision of the electron causes…
Correct answer: Electron- A. Inner shell transition is possible
- B. Inner shell transition is not possible
- C. It is non-radioactive
- D. None of these
Explanation: Correct Option: BThis option is correct because x-rays are produced by inner shell transition which is not possible in Na.
Correct answer: Inner shell transition is not possible