# Structure of Atom MCQs with FREE PDF

These Structure of Atom MCQs with FREE PDF contains most important Questions and Answers on various topic such as

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## Structure of Atom MCQs

a) neutrons

b) protons

c) electrons

d) mass

a) bright spot

b) blue light

c) uv rays

d) white light

a) Electron

b) Proton

c) Neutron

d) Particle

#### 4. What’s the mass of neutron in terms of electrons mass?

a) 1838 times of electron’s mass

b) 1/1838 times of electron’s mass

c) 1832 times of electron’s mass

d) 1/1832 times of electron’s mass

Answer: 1838 times of electron’s mass

a) True

b) False

#### 6. Which of the following may be an incorrect statement regarding cathode ray discharge tube?

a) Presence of negative charge in cathode rays

b) The magnetic field deflects these rays

c) It needs high voltage

d) Protons are present in cathode rays

Answer: Protons are present in cathode rays

#### 7. Which of the following condition is suitable for cathode ray discharge tube?

a) Low pressure, high voltage

b) Low pressure, low voltage

c) High pressure, low voltage

d) High pressure, high voltage

a) 13, 13

b) 13, 27

c) 14, 13

d) 27, 14

a) protium

b) deuterium

c) tritium

d) helium

a) True

b) False

a) 20, 20, 17

b) 17, 17, 20

c) 20, 17, 17

d) 17, 17, 17

a) True

b) False

a) 12Mg24

b) 26Fe58

c) 19K40

d) 28Ni64

#### 14. What is the absolute charge of a proton?

a) +1.602176×10-27

b) –1.602176×10-19

c) +1.602176×10-19

d) –1.602176×10-27

#### 15. Which of the following models are not the same as Thomson Model of Atom?

a) plum pudding model

b) watermelon model

c) raisin pudding model

d) nuclear model

a) Required

b) Activated

c) Threshold

d) Limiting

a) 3.8 KJ

b) 5.2 KJ

c) 9 KJ

d) 1.4 KJ

a) Balmer

b) Lyman

c) Paschen

d) Brackett

a) 82357.75 cm-1

b) 105,677 cm-1

c) 82257.75 cm-1

d) 109,677 cm-1

a) True

b) False

a) 400 – 750 nm

b) 400 – 750 mm

c) 400 – 750 μm

d) 400 – 750 pm

a) 2 Hz

b) 3 Hz

c) 1 Hz

d) 4 Hz

a) 25 x 103 mm-1

b) 25 x 103 m-1

c) 25 x 103 cm-1

d) 25 x 103 nm-1

a) False

b) True

#### 24. Bohr’s model could not explain the ability of atoms to form molecules by ______

a) Attraction

b) Physical bonds

c) Chemical bonds

d) Polarity

a) 434 nm

b) 456 nm

c) 863 nm

d) 268 nm

a) True

b) False

#### 27. Which of the following is the value for Rydberg constant?

a) 2.95 x 10-18 J

b) -2.95 x 10-18 J

c) -2.18 x 10-18 J

d) 2.18 x 10-18 J

a) mev2r

b) mevr2

c) mer

d) mevr

a) True

b) False

a) 3.18×10–12 J

b) –2.18×10–18 J

c) –3.18×10–18 J

d) 2.18×10–18 J

#### 31. As per Heisenberg’s principle of uncertainty, the relation between relative momentum and relative position is __________

a) independent

b) equal

c) directly proportional

d) inversely proportional

a) True

b) False

#### 33. An object has a mass of 6 kg and velocity of 10 m/s. The speed is measured with 5% accuracy, then find out Δx in m.

a) 0.12676 x 10-34

b) 0.1566 x 10-34

c) 0.176 x 10-34

d) 0.276 x 10-34

#### 34. If the kinetic energy of an electron is 5J. Find out its wavelength.

a) 0.313 x 1015 m/s

b) 3.013 x 1015 m/s

c) 3.310 x 1015 m/s

d) 3.313 x 1015 m/s

a) √h/4π

b) √h4π

c) √h/4

d) √h/π

#### 36. The uncertainty of a ball is given by 0.5A°. Then calculate the uncertainty in momentum.

a) 2.055 x 10-24 kgm/s

b) 1.015 x 10-24 kgm/s

c) 1.055 x 10-24 kgm/s

d) 1.095 x 10-24 kgm/s

a) 0.67A°

b) 0.67nm

c) 0.37A°

d) 1.67A°

a) 1 x 10-34 m

b) 2 x 10-34 m

c) 2 x 10-32 m

d) 2 x 10-3 m

a) 16

b) 4

c) 32

d) 12

a) True

b) False

a) 5d

b) 4p

c) 3p

d) 2s

#### 42. Which of the following set of quantum numbers is not valid?

a) n = 5, l = 2, m = 0, s = 1/2

b) n = 1, l = 2, m = 0, s = 1/2

c) n = 5, l = 3, m = 2, s = 1/2

d) n = 5, l = 2, m = 0, s = -1/2

Answer: n = 1, l = 2, m = 0, s = 1/2

a) 3

b) 2

c) 1

d) 0

a) 1

b) ±1

c) -1

d) 0

#### 45. What is the shape the orbital, whose “l” is 1?

a) Spherical

b) Dumbbell

c) Double dumbbell

d) Complex

#### 46. The principal quantum number describes ____

a) energy and size of the orbit

b) the shape of the orbital

c) spatial orientation of the orbital

d) the spin of the electron

Answer: energy and size of the orbit