NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Physics MCQs (Practice_Test 24 of 35)
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- Match List I with List II and select the correct answer.
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 24 of 35) List-I (Physical constants) List-II (Formulae) - Bohr radius
- Compton wavelength
- Bohr magnetron
- Fine structure constant
- ke2⟋hc
- h⟋mc
- eh⟋2m
- h⟋mke2
- A
- B
- C
- D
- 1
- 2
- 3
- 4
- 4
- 2
- 3
- 1
- 2
- 4
- 1
- 3
- 4
- 3
- 2
- 1
- If the frequency of Ka X-ray emitted from the element with atomic number 31 is f, then the frequency of Ka X-ray emitted from the element with atomic number 51 would be
- f
- f
- f
- f
- If the magnetic quantum number m1 of an electron in a particular excited state of hydrogen atom is 5, then the possible choice of quantum numbers n, l, m1and ms would be respectively
- 8,6, 5,
- 6,6, 5-
- 7,7, 5,
- 5,5, 5-
- According to Pauli principle 2n2 electron can occupy the major shell with principal quantum number n. Out of 50 electrons in the major shell n = 5, the number of electrons having magnetic quantum number m1 = 1 would be
- 5
- 10
- 8
- 2
- Given that the formula for the various spectral series in the hydrogen atom is given by 1⟋l = R (1⟋n2 − 1⟋n2) where n1 and n integers, match List I and List II and select the correct answer using the codes given below the lists:
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 24 of 35) List-I (Values of n1) List-II - Balmer series
- Brackett series
- Paschel series
- Lyman series
- n1 = 1
- n1 = 2
- n1 = 3
- n1 = 4
- A
- B
- C
- D
- 2
- 1
- 3
- 4
- 2
- 4
- 3
- 1
- 3
- 4
- 1
- 2
- 4
- 3
- 2
- 1
- Which one of the following pairs of phenomena illustrates the particular aspect of wave-particle duality?
- Compton effect and Bragg՚s law
- Photoelectric effect and Compton effect
- Compton effect and Pauli principle
- Bragg՚s law and photoelectric effect
- Consider the following statements regarding compton effect:
- Wavelength of scattered photon is greater than the wavelength of incident photon.
- For scattering angle equal to 900 the change in wavelength of the scattered photon (known as Compton shift) is constant
- The maximum Compton shift occurs when the scattering angle is 1800
- Compton shift depends upon the wavelength of the incident photon.
- Compton shift depends upon! he nature of the scattering material.
- Of these statements:
- 1,2 and 3 are correct
- 2,4 and 5 are correct
- 3,4 and 5 are correct
- 1,4 and 5 are correct
- An electron of in mass ‘m’ and change ‘e’ initially at rest gets accelerated by a constant electric field E. The rate of change of de-Broglie wavelength of this electron at time t, ignoring relativistic effects, is
- -h⟋e E t2
- -e h t⟋E
- -m h⟋e E t2
- -h⟋e E
- If a nucleus A⟋Z X emits an alpha particle and a beta particle, then the daughter nucleus Will have which of the following configurations?
- A − 4 nucleons
- Z − 2 protons
- A-Z − 3 neutrons
- Select the correct answer using the codes given below:
- 1,2 and 3
- 1 and 2
- 1 and 3
- 2 and 3
- Which one of the following statements about uranium is correct?
- 235U us fissionable by thermal neutrons
- Fast neutrons trigger the fission process in 235U
- 238U breaks up into fragments, when bombarded by slow neutrons
- 235U is an unstable isotope and undergoes spontaneous fission
- Consider the following statements regarding classification of elementary particles:
- m, h K are called leptons.
- p, hare called nucleons.
- A, X, W are caned hyperons.
- Of these statements
- 1,2 and 3 are correct
- 1 alone is correct
- 2 and 3 are correct
- 1 and 3 are correct
- Match List I and List II and select the correct answer.
Table Supporting: NET, IAS, State-SET (KSET, WBSET, MPSET, Etc.) , GATE, CUET, Olympiads Etc. : Physics MCQs (Practice_Test 24 of 35) List-I (Types of interactions) List-II (Field quanta) - Strong
- Electromagnetic
- Weak
- Gravitational
- Graviton
- Photon
- Intermediate vector Boson
- Pion
- A
- B
- C
- D
- 4
- 3
- 1
- 2
- 1
- 2
- 3
- 4
- 4
- 2
- 3
- 1
- 3
- 4
- 2
- 1
- In a vacuum diode, the plate current l varies with plate voltage V as
- V
- V
- V
- V2
- When the plate voltage of a triode is increased from 225 V to 260 V, the control grid voltage must be changed from-4 V to-4.7 V to keep the plate current constant. The amplification factor m of the triode is:
- 70
- 50
- 35
- 15
- The mutual characteristics of the triode is a relation between
- plate voltage and plate current
- plate voltage and grid current
- grid voltage and plate voltage
- grid voltage and plate current