The mass of a proton is:

1. 1.674 x 10^-24Kg
2. 1.672 x 10^-27g
3. 1.672 x 10^-27Kg
4. 1.672 x 10^-24Kg
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Answer: C
Explanation:
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The correct mass of a proton is:

1. 1.674 x 10^-24g
2. 1.672 x 10^-27Kg
3. 1 a.m.u
4. All of these
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Answer: D
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Proton has a charge of:

1. 9.1 x 10^-11C
2. 6.1 x 10^-19C
3. 1.6 x 10^-19C
4. 1.6 x 10¹⁹C
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Answer: C
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The mass of neutron is:

1. 1.674 x 10^-24g
2. 1.672 x 10^-27g
3. 1.672 x 10^-27Kg
4. 1.672 x 10^-24Kg
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Answer: A
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The value of Rydberg's constant (R) is:

1. 1.7904 x 10⁷m^-1
2. 1.09768 x 10⁷m^-1
3. 1.9768 x 10⁷m^-1
4. 1.6 x 10⁷m^-1
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Answer: B
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The value of Planck's constant (h) is:

1. 6.62 x 10^-34J.sec
2. 6.62 x 10^-27erg.sec
3. 1.582 x 10^-34cal.sec
4. All of these are correct
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Answer: D
Explanation:
• Since 1 J = 10⁷ erg and 1 cal = 4.184 J
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According to Bohr's model, the electrostatic force of attraction between the nucleus and revolving electron is given by;

1. mv²/r
2. ze²/r
3. z²e²/r²
4. nh / 2π
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Answer: C
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The atomic radius is of the order of

1. 10^-8 cm
2. 10^-8 cm
3. 10^-12 cm
4. 10^-10 cm
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Answer: A
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Value of Rydberg's constant is:

1. 1.7904 x 10⁷ cm^-1
2. 109678 m^-1
3. 109678 cm^-1
4. 1.6 x 10⁷ m^-1
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Answer: C
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The energy of an electron in the first Bohr orbit of H-atom is;

1. 1313.31 KJ mol^-1
2. -1313.31 KJ mol^-1
3. -313.31 KJ mol^-1
4. -13.6 KJ mol^-1
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Answer: B
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