Question 51 : Most penetrating radiation of radioactive element is:
1. x — rays
2. β — rays
3. α — rays
4. γ — rays
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Question 52 : The nature of positive rays depends on?
1. The nature of discharge tube.
2. The nature of residual gas
3. The nature of electrode
4. All of above.
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Question 53 : Quantum number value for 2p sub shell are?
1. n = 2, L = 1
2. n = 1,L = 0
3. n = 1, L = 1
4. n = 2, L = 0
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Question 54 : when 6d orbital is complete, the entering electron goes into?
1. 7p
2. 7d
3. 7f
4. 7s
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Question 55 : The heaviest particle among all the four given particles is?
1. Meson
2. Proton
3. Neutron
4. Electron
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Question 56 : The absolute charge of an electron is___________.
1. 6 x 10^-19C
2. 6 x 10^-19 C
3. 16 x 10^-19C
4. + 6 x 10-19C
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Question 57 : Which one of the following sets of quantum numbers(n,l,ml, ms) represents as impossible arrangement?
1. 3,2,-2,1/2
2. 4,0,0,1/2
3. 5,3,0,-1/2
4. 3,2,-3,1/2
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Question 58 : Bohr model can explain:
1. spectrum of an atom or ion containing one electron only.
2. the spectrum of hydrogen atom only
3. the solar spectrum
4. the spectrum o hydrogen molecule
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Question 59 : Any p-orbital can accommodate up to
1. four electrons
2. two electrons with opposite spins
3. six electrons
4. two electrons in parallel groups
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Question 60 : correct set of four quantum numbers forhte valence (outmost) electron of rubidium 9Z = 37) is:
1. 6,0,0,+1/2
2. 5,1,0, +1/2
3. 5,0,0,+1/2
4. 5,1,1,+1/2
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