1. . The word atom is derived from a Greek word
(A) Particle
(B) Basic
(C) Demos
(D) Atomos
2. . The mass of electron is times of the mass of proton
(A) 1/1834
(B) 1/1836
(C) 1/1838
(D) 1/1840
3. . All the particles present in the nucleus are called
(A) Neutron
(B) Hypron
(C) Anti-nucleon
(D) Nucleon
4. . The proton was discovered by
(A) J.J. Thomson
(B) Goldstein
(C) Dalton
(D) Chadwick
5. . The atomic number is represented by
(A) A
(B) Z
(C) N
(D) M
6. . The region around the nucleus where probability of finding the electrons is maximum is called
(A) Orbit
(B) Band
(C) Axis
(D) Radius
7. . The maximum number of electrons in ‘s’ orbital is
(A) 1
(B) 2
(C) 3
(D) 4
8. . The groups present in the periodic table are
(A) 6
(B) 7
(C) 8
(D) 9
9. . The periods in the periodic table are
(A) 6
(B) 7
(C) 8
(D) 9
10. . The vertical columns in periodic table are called
(A) Periods
(B) Groups
(C) Lines
(D) Series
11. . The horizontal rows in periodic table are
(A) Periods
(B) Groups
(C) Lines
(D) Series
12. . Modern periodic law is based on
(A) Atomic number
(B) Atomic mass
(C) Neutron number
(D) Nucleons
13. . The valency of all the elements present in same group is
(A) Different
(B) Multiples
(C) Variable
(D) Same
14. . The blocks in the periodic table are
(A) 1
(B) 2
(C) 3
(D) 4
15. . Atomic size, in a group from top to bottom
(A) Increases
(B) Decreases
(C) Remain same
(D) Uncertain
16. . Until now elements has been discovered
(A) 109
(B) 110
(C) 111
(D) 112
17. . The smallest particle of an element that takes part in chemical reaction is
(A) An atom
(B) A molecule
(C) Radical
(D) A compound
18. . The mass of a neutron is, Kg
(A) 9.11 × 10⁻³¹
(B) 1.6726 × 10⁻²⁷
(C) 1.67492 × 10⁻²⁷
(D) 1.67492 × 10⁻²⁸
19. . The atoms of the same element having same atomic number but different mass number are called
(A) Isotopes
(B) Isobars
(C) Isomers
(D) Polymers
20. . The maximum number of electrons in an orbit is given by formula
(A) 2n¹
(B) 2n²
(C) 2n³
(D) 2n⁴