FSC Physics MCQs Chapter 20 Class 12


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Physics Ch 20 Class 12 Atomic Spectra

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X rays are affected by:

NUMS 2018
Physics
Atomic Spectra
Elimination Tool:

2 / 61

The number of protons in the nucleus is called _____ number.

PMC Sample 3
Physics
Atomic Spectra
Elimination Tool:

3 / 61

An electron cannot reside inside a nucleus is explained by:

PMC Practice 5
Physics
Atomic Spectra
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4 / 61

Bright Lines in pattern show:

PMC Practice 5
Physics
Atomic Spectra
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5 / 61

Spectral lines is like a __________ of absorbed or emission energy in a spectrum.

PMC Sample 3
Physics
Atomic Spectra
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6 / 61

The wavelength of X-rays is:

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X-rays are also known as:

NTS 2015 DUHS and JSMU
Physics
Atomic Spectra
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8 / 61

The ratio of mass of electron to neutron is:

PMC Practice 4
Physics
Atomic Spectra
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9 / 61

If an electron jumps from 68′ orbit to 7 orbit, the increase in radius will be:

10 / 61

For gaining an atomic spectra, an evacuated glass tube is filled with:

NUMS 2020
Physics
Atomic Spectra
Elimination Tool:

11 / 61

In hydrogen spectrum If nj = 6, then the spectral lines lie In:

12 / 61

Which series is emitted when electron Jumps from a higher orbit to fifth orbit?

13 / 61

When an electron jumps from outer to 5th orbit, then the spectral lines fall into region.

14 / 61

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

PMC Sample 3
Physics
Atomic Spectra
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15 / 61

_____ are such nuclei of an element that have the same mass number A, but have different charge number Z.

PMC Practice 4
Physics
Atomic Spectra
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16 / 61

Lifetime of an excited state is

PMC Sample 3
Physics
Atomic Spectra
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17 / 61

The anti-particle of quark is _________.

PMC Practice 5
Physics
Atomic Spectra
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18 / 61

Consider the spectral line resulting from the transition from n=2 to n=1, in atoms and ions given below. The shortest wavelength is produced by:

PMC Sample 3
Physics
Atomic Spectra
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19 / 61

An atom would be neutral if it has equal number of:

PMC Practice 5
Physics
Atomic Spectra
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20 / 61

Which of the following statements is not consistent with Bohr’s set of postulates regarding the hydrogen atom model with regard to the emission and absorption of light?

NTS 2013
Physics
Atomic Spectra
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21 / 61

Electrons are emitted in the production of X rays by:

NUMS 2016
Physics
Atomic Spectra
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22 / 61

Calculate the energy of a photon of wavelength 6600 angstroms.

PMC Sample 3
Physics
Atomic Spectra
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23 / 61

A nucleus consists of 19 protons and 20 neutrons. The conventional symbol of this nucleus is:

NTS 2013
Physics
Atomic Spectra
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24 / 61

Find the longest wavelength in the Paschen series, given R = 1.097 x 107m-1.

NUMS 2019 Reconduct
Physics
Atomic Spectra
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25 / 61

Total energy of an electron in hydrogen atom when it Jumps to higher orbit from a lower orbit Is

26 / 61

X rays are similar in nature to:

NUMS 2018
Physics
Atomic Spectra
Elimination Tool:

27 / 61

Spectra corresponding to the sodium vapour lamp is:

PMC Practice 5
Physics
Atomic Spectra
Elimination Tool:

28 / 61

Energy difference in balmer series for longest wavelength is

PMC Sample 3
Physics
Atomic Spectra
Elimination Tool:

29 / 61

Which of the following is different for isotopes?

PMC Practice 3
Physics
Atomic Spectra
Elimination Tool:

30 / 61

Energy of the 4th orbit in a hydrogen atom is:

PMC Sample 1
Physics
Atomic Spectra
Elimination Tool:

31 / 61

If a proton, alpha particle, and photon moving with the same velocity enter a uniform magnetic field, then which particle will deflect more?

PMC Practice 3
Physics
Atomic Spectra
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32 / 61

Radiations emitted by human body lie in which of the following series?

33 / 61

The nucleus shape is considered to be:

PMC Practice 4
Physics
Atomic Spectra
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34 / 61

The wavenumber of a photon in Brackett series is 9/400 R then electron transited from orbit with the quantum number:

PMC Sample 2
Physics
Atomic Spectra
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35 / 61

The down quark has charge ________.

PMC Practice 5
Physics
Atomic Spectra
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36 / 61

The target in the X ray unit is given a:

NUMS 2018
Physics
Atomic Spectra
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37 / 61

If the ionization energy of a hydrogen atom is 13.6 eV, its ionization potential will be:

PMC Sample 1
Physics
Atomic Spectra
Elimination Tool:

38 / 61

The phenomenon in which certain elements emit invisible radiations is called:

NTS 2018
Chemistry
Atomic Spectra
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39 / 61

The ratio of wavelength of last line of Balmer series and last line of lymen series is

PMC Sample 2
Physics
Atomic Spectra
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40 / 61

________ are very high energy electromagnetic radiations of the extremely short wavelength emitted from the nuclei of radioactive atoms originating from the high energy transitions of the nucleons in the nuclei.

NTS 2015 DUHS and JSMU
Physics
Atomic Spectra
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41 / 61

A star moving away from earth shows?

PMC Practice 5
Physics
Atomic Spectra
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42 / 61

The formula for the Paschen series for the Hydrogen spectrum is _______.

NTS 2019
Physics
Atomic Spectra
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43 / 61

For the first time in 1914, Henry Moseley used X-rays for the determination of:

NTS 2018
Chemistry
Atomic Spectra
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44 / 61

The penetrating power of X rays increases with:

NUMS 2018
Physics
Atomic Spectra
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45 / 61

Transition of electrons should occur between which orbitals(n) that will emit the longest wavelength in the Balmer series of Hydrogen.

NUMS 2019 Reconduct
Physics
Atomic Spectra
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46 / 61

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:

PMC Sample 2
Physics
Atomic Spectra
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47 / 61

The first excitation energy of H atom will be:

NUMS 2015
Physics
Atomic Spectra
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48 / 61

The velocity of X rays is equal to that of:

NUMS 2018
Physics
Atomic Spectra
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49 / 61

If the wavelength of K X-ray from Cu is 1.337 x 10-10m, then the energy difference between two levels from which transition results will be:

NUMS 2019 Cancelled
Physics
Atomic Spectra
Elimination Tool:

50 / 61

When describing the isotopes of the same element, the most accurate statement is that they have:

NTS 2017
Physics
Atomic Spectra
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51 / 61

The ionization energy of hydrogen is:

52 / 61

During the production of x-rays, the cathode and anode are enclosed inside an evacuated glass chamber and a high DC voltage of the order of:

NUMS 2020
Physics
Atomic Spectra
Elimination Tool:

53 / 61

A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by?

PMC Sample 3
Physics
Atomic Spectra
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54 / 61

If an electron undergoes transition from 4th to 2nd orbit, then the color of radiations produced will be:

55 / 61

Laser light is

56 / 61

In hydrogen spectrum, Lyman and Balmer series belong to which region?

57 / 61

X Ray ______ causes damage to living tissues. As X rays are absorbed in tissues, they break molecular bonds and create reactive free radicals (such as H and OH).

NUMS 2017
Physics
Atomic Spectra
Elimination Tool:

58 / 61

The shortest wavelength photon emitted in Balmer series is:

NTS 2012
Physics
Atomic Spectra
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59 / 61

According to Bohr’s theory of Hydrogen atom, only those atomic orbits with radii ‘r’ and atomic shell ‘n’ around the nucleus are allowed which have the angular moments:

NTS 2016 DUHS & JSMU
Physics
Atomic Spectra
Elimination Tool:

60 / 61

A particle of mass 5 mg moves with a speed of 8 m/s. Calculate its de Broglie wavelength (h = 6.63 x 10-34 Js)

NTS 2015 DUHS and JSMU
Physics
Atomic Spectra
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61 / 61

The atomic spectra deals with the measurement of?

NTS 2014
Physics
Atomic Spectra
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