RRB Group D, NTPC and other exams with answer atoms and molecule top 40 mcQ

It is necessary to understand atoms and molecules for various competitive examinations including RRB Group D, NTPC and other government job tests. Questions of this subject often assess about a candidate’s basic chemistry concepts, nuclear structure, molecular structure and chemical reactions.

To help you prepare effectively, we have compiled a set of multiple-chisics questions (MCQ) along the answer, covering the major aspects of atoms and molecules. These MCQs will increase your knowledge and improve the possibility of scoring well in the exam.

RRB Group D, NTPC and Atomic and Molecu MCQs for other exams

Here are mcqs:

1. Who named positive rays (canal rays)?
A) JJ Thomson
B) Rutherford
C) bohar
d) Dalton

2. When Berillium was bombed with alpha particles, which particle was discovered?
A) proton
B) neutron
C) electron
d) Positron

3. Whose name was Neutron’s name?
a) Chadwick
B) bohar
C) Rutherford
d) Thomson

4. A) captured by the nucleus
B) empty space
C) Filled with electrons
D) charged positively

5. The nucleus of an atom includes:
A) Proton and Electron
B) neutrons and electrons
C) protons and neutrons
d) only proton

6. Bohar’s nuclear model corrected inconsistency:
a) Dalton model
B) Thomson’s model
C) Rutherford’s model
d) Avogadro hypothesis

7. The nucleus is due to the force holding protons and neutrons simultaneously:
a) Mason Exchange
B) Electron Cloud
C) gravity bridge
d) co -ordinator bond

8. There is a number of electrons in the outer shell of a stable (passive) atom:
a) 2 (or 8 for large atoms)
B) 4
C) 6
d) 10

9. Principal determines quantum number (n):
a) orbital size
B) energy level
C) Electron Spin
d) magnetic orientation

10. L-shell (n = 2) has a maximum number of electrons:
a) 2
B) 8
C) 18
d) 32

11. Planck’s quantum theory states that energy is:
a) continuous
B) Proportional for frequency (E = h ν)
C) wavelength independent
d) always stable

12. Hygenberg’s uncertainty is related to theory:
A) Electron status and speed
B) Proton-Netron Ratio
C) Atomic mass and charge
d) orbital size

13. Azimuthal Quantum Number (L) for P-Orbital is:
A) 0
B) 1
C) 2
d) 3

14. Pauli’s exclusion theory states that no one can be the same in two electrons:
A) Energy level
B) Set of four quantum numbers
C) spin direction
d) orbital size

15. Aufbau describes theory:
a) Electron Pairing
B) Filling the orbitals with the highest energy
C) Electron Spin
D) orbital hybridization

16. Electron configuration for nitrogen (n, z = 7) is:
a) 1s g 2s – 2p has
B) 1s g 2s – 2p⁶
c) 1s g 2s We 2p⁴
d) 1s g 2s² 2p-

17. The village refers to atomic load:
a) 6.022 × 10 × atom in village
B) 1 mole of electrons
C) Number of molecules of avogadro
D) Nuclear mass in kg

18. Law of fixed ratio was proposed:
A) Dalton
B) prousst
C) Evogadro
d) Lavoisier

19. A weight equal to an element is calculated:
A) Atomic weight / validity
B) molecular weight × validity
C) Atomic weight × validity
D) molecular load / assessment

20. Avogadro’s hypothesis states that at the same temperature, equal quantity and pressure of gases occur:
a) equal mass
B) equal number of molecules
C) equal density
D) equal atomic size

21. Oxygen gas (o,) atoms are:
A) 1
B) 2
C) 3
d) 4

22. The vapor density of a gas is related to its molecular load:
A) M = 2D
B) D = 2m
c) m = d/2
d) d = mic

23. Any substance has a mole:
a) 6.022 × 10 was K particles
B) 6.022 × 10 kell particles
c) 6.022 × 10 kell particles
d) 6.022 × 10 kell particles

24. A value of electrons is alleged:
A) 9650 c
B) 96500 C
C) 965000 c
D) 1.6 × 10⁻⁹ c

25. Dalton’s atomic theory proposed that atoms are:
a) divisible
B) indestructible
C) Similar to all elements
D) charged positively

26. Scientists searching protons using positive rays were:
A) Goldstein
B) Thomson
C) Milikan
d) Faraday

27. The mass of a proton is almost:
a) 1 amu
B) 1/1837 Amu
c) 0 amu
d) 2 amu

28. Neutron was discovered by bombing which element with alpha particles?
A) hydrogen
B) Berillium
C) carbon
d) oxygen

29. There is one in the nucleus of an atom:
a) negative charge
B) neutral charge
C) positive charge
d) Convertible charge

30. The number of orbitals in D-Sochelle:
A) 1
B) 3
C) 5
d) 7

31. Spin quantum number (s) may have values:
a) +1 or -1
b) +½ or –½
C) 0 or 1
d) +1, 0, -1

32. The electronic configuration of chlorine (CL, Z = 17) is:
a) 1s g 2s k 2p⁶ 3s ² 3p⁵
B) 1s g 2s – 2p⁶ 3s- 3p⁶
c) 1s g 2s – 2p⁶ 3s We 3p⁶
d) 1s g 2s – 2p⁶ 3s ⁴ 3p⁴

33. Planck’s constant (H) value is:
a) 6.626 × 10⁻⁻⁴ JS
B) 6.022 × 10 JS JS
c) 1.6 × 10⁻⁹ JS
D) 3 × 10⁸ JS

34. The law of mutual ratio was proposed:
A) Richter
B) prousst
C) Dalton
d) gay-lusak

35. The gram of co₂ is molecular weight:
a) 12 grams
B) 44 grams
C) 32 grams
d) 28 grams

36. The number of electrons in a neutral atom of sodium (NA, z = 11) is:
a) 10
B) 11
C) 12
d) 23

37. The size of a S-orbital:
A) spherical
B) dumbbell
C) cloverlif
D) complex

38. Magnetic quantum number (M) determines:
A) orbital orientation
B) energy level
C) spin direction
d) orbital size

39. Electron configuration 1s – 2s g 2p⁶ 3s g 3s 3s is the element with 4Sunic:
A) Potassium (K)
B) Calcium (CA)
C) sodium (NA)
D) Argon (AR)

440. The number of neutrons in an atom is calculated:
a) Atomic number – mass number
B) Mass Number – Atomic Number
C) Atomic number + mass number
D) mass number / atomic number

RRB Group D, NTPC and Atomic and Molecule Answer for other exams

Here are the answers:

1. A) JJ Thomson
2. B) neutron
3. a) Chadwick
4. B) empty space
5. C) protons and neutrons
6. C) Rutherford’s model
7. a) Mason Exchange
8. a) 2 (or 8 for large atoms)
9. B) energy level
10. B) 8
11. B) Proportional for frequency (E = h ν)
12. A) Electron status and speed
13. B) 1
14. B) Set of four quantum numbers
15. B) Filling the orbitals with the highest energy
16. a) 1s g 2s – 2p has
17. a) 6.022 × 10 × atom in village
18. B) prousst
19. A) Atomic weight / validity
20. B) equal number of molecules
21. B) 2
22. A) M = 2D
23. B) 6.022 × 10 kell particles
24. B) 96500 C
25. B) indestructible
26. A) Goldstein
27. a) 1 amu
28. B) Berillium
29. C) positive charge
30. C) 5
31. b) +½ or –½
32. a) 1s g 2s k 2p⁶ 3s ² 3p⁵
33. a) 6.626 × 10⁻⁻⁴ JS
34. A) Richter
35. B) 44 grams
36. B) 11
37. A) spherical
38. A) orbital orientation
39. A) Potassium (K)
40. B) Mass Number – Atomic Number