Science Atomic structure Most important MCQ

Science Atomic structure Most important MCQ

Question:1 the proton is heavier than an electron by

1. 187 times
2. 1837 times
3. 3837 times
4. 2827 times

Question:2 which of the following is true about a charge atom?

1. anion is negatively charged
2. cation is negatively charged
3. cation has gained an electron
4. anion has lost an electron

Question: 3 which of the following is not a fundamental particle ?

1. proton
2. Neutron
3. Alpha particle
4. Electrons

Question:4 The number of protons in a negatively charged atom (anion) is

1. more than the atomic number of the element
2. less than the atomic number of the element
3. more than the number of electrons in the atom
4. less than the number of electrons in the atom

Question:5 Constituents of atomic nucleus are–

1. Electron and proton
2. Electron and neutron
3. Proton and neutron
4. Proton, neutron and electron

Question:6 the atomic nucleus was discovered by”

1. Rutherford
2. Dalton
3. Einstein
4. Thompson

Question:7 the nucleus of Helium has”

1. Only one neutron
2. two protons
3. two protons and two neutrons
4. One proton and two neutron

Question:8 which of the following carries a negative charge?

1. X-rays
2. Alpha particles
3. beta particles
4. Gamma rays

Question:9 what is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?

1. 2
2. 4
3. 6
4. 8

Question:10 The atoms in which the number of protons is same but the number of neutrons is different are known, as-

1. Isobars
2. Isomers
3. Isotones
4. Isotopes

Question:11 when 6d Orbital is complete, the entering electron goes into?

1. 7d
2. 7f
3. 7p
4. 7s

Question:12 An element has 18 electrons, and 20 neutrons its charge is—2 what is its mass number?

1. 38
2. 39
3. 32
4. 40

Question:13 the most electronegative element is?

1. Iodine
2. Chlorine
3. Bromine
4. Florine

Question:14 Principle Quantum number describes?

1. Orientation of an or Orbital
2. shape of Orbital
3. size of orbital
4. spin of orbital

Question: 15 The Isotope deuterium of hydrogen has

1. No neutrons and one proton
2. One neutrons and two protons
3. one electron and two neutron
4. one proton and one neutron

Question: 16 the isotope used to remove the brain tumours and treatment of cancer is

1. U-235
2. Na-24
3. .Iodine
4. .CO-60

Question:17 An alpha particle contains

1. 4.positive charge and 2 mass unit
2. 2.positive charge and 4 mass unit
3. 2. positive charge and 2 mass unit
4. 4. positive charge and 4 mass unit

Question:18 the electrons present in the outermost shell are called the electrons present in the outermost shell are called

1. valency electrons
2. Octate electrons
3. Duplet electrons
4. valence electrons

Question:19 Mg²⁺ is isoelectronic

1. Ca²⁺
2. Na⁺
3. Zn²⁺
4. Cu²⁺

Question:20 which of the following statements about the electron is incorrect?

1. It is a negatively charged particle
2. the mass of electron is equal to the mass of neutron
3. it is a basic constituent of all atoms
4. It is a constituent of cathode rays,

Question:21 the Maximum number of electrons that can be accommodated in third shell (n=3) is”

1. 2
2. 8
3. 18
4. 10

Question:22 what is the number of valence electrons of AI?

1. 1
2. 2
3. 3
4. 4

Question:23 ₁₇CI³⁵and ₁₇ CI³⁷ are example of”

1. Isobars
2. Isotopes
3. Isoelectrons atoms
4. None of the above

Question:24 In deuterium number of neutrons are”

1. 3
2. 2
3. 1
4. 0

Question:25 valence electrons refer to the

1. total number of electrons
2. total number of protons and neutrons in nucleus
3. total number of electrons in the outermost shell
4. the two electrons in the duplet

Answers

Q.No	Answer	Q,No	Answer
1	B	14	C
2	A	15	D
3	C	16	D
4	D	17	B
5	C	18	D
6	B	19	B
7	C	20	B
8	C	21	C
9	B	22	C
10	D	23	B
11	C	24	C
12	D	25	C
13	D