Entry Test MCQ :: Atomic Structure
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1. |
All of the following were theorized by Bohr in his description of the atom except |
A. |
Angular momentum of electrons in multiples of h/2? |
B. |
Electrons revolve in discrete circular orbits |
C. |
Energy of each electron is directly proportional to n2 |
D. |
Electrons radiate energy continuously in a given orbit. |
Answer: Option D
Explanation:
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2. |
The letters s p d and f are used to represent which quantum numbers |
A. |
Principal |
B. |
Azimuthal |
C. |
Magnetic |
D. |
Spin |
Answer: Option B
Explanation:
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3. |
The magnetic quantum number (QN) has its values determined directly by the value of |
A. |
Principal (QN) |
B. |
Azimuthal (QN) |
C. |
Spin (QN) |
D. |
Both a & b |
Answer: Option B
Explanation:
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4. |
The atomic number of an element having maximum number of unpaired electrons in p-subshell is |
Answer: Option A
Explanation:
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5. |
The maximum number of electron in a sub shell with ? = 3fs |
Answer: Option C
Explanation:
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6. |
Radius of the third shell of H-atom is |
A. |
5.761 A? |
B. |
4.761 A? |
C. |
6.671 A? |
D. |
3.716 A? |
Answer: Option B
Explanation:
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7. |
When an atom absorbs energy the lines in the spectrum will appear which are |
A. |
Brighter |
B. |
Darker |
C. |
Colourless |
D. |
Hard to locate |
Answer: Option B
Explanation:
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8. |
Colour of fluorescene produced by cathode rays depends upon |
A. |
Temperature |
B. |
Pressure |
C. |
Volume |
D. |
Composition of glass |
Answer: Option D
Explanation:
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9. |
Which one is not true about cathode rays? |
A. |
9.11x10-31 Kg |
B. |
Cast shadow |
C. |
Heat up the platinum foil |
D. |
Cannot ionize |
Answer: Option D
Explanation:
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10. |
Positive rays are produced |
A. |
By burning of gas |
B. |
By cooling of the gas |
C. |
By the bombardment of cathode rays on gas molecules |
D. |
From anode like cathode rays produced from cathode |
Answer: Option C
Explanation:
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