1. . The word atom is derived from a Greek word
(A) Particle
(B) basic
(C) atomos
(D) demos
2. . The mass of electron is ______ times the mass of proton
(A) 1/1834
(B) 1/1838
(C) 1/1836
(D) 1/1840
3. . All the particles present in the nucleus are called
(A) nucleon
(B) hypron
(C) Anti-nucleon
(D) Neutron
4. . The proton was discovered by
(A) J.J. Thomson
(B) Dalton
(C) Goldstein
(D) Chadwick
5. . The atomic number is represented by
(A) A
(B) N
(C) Z
(D) M
6. . The region around the nucleus where probability of finding the electrons is maximum is called
(A) band
(B) orbit
(C) axis
(D) radius
7. . The maximum number of electrons in ‘s’ orbital is
(A) 2
(B) 1
(C) 3
(D) 4
8. . The groups present in the periodic table are
(A) 6
(B) 8
(C) 7
(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) Lines
(C) Groups
(D) Series
11. . The horizontal rows in periodic table are
(A) Series
(B) Groups
(C) Lines
(D) Periods
12. . Modern periodic law is based on
(A) atomic mass
(B) Atomic number
(C) Neutron number
(D) nucleons
13. . The valency of all the elements present in same group is
(A) Different
(B) same
(C) variable
(D) multiples
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) remain same
(B) decreases
(C) Increases
(D) uncertain
16. . Until now ______ elements have 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) radical
(B) a molecule
(C) An atom
(D) a compound
18. . The mass of a neutron is, Kg
(A) 9.11 x 10⁻³¹
(B) 1.67492 x 10⁻²⁷
(C) 1.6726 x 10⁻²⁷
(D) 1.67492 x 10⁻²⁸
19. . The atoms of the same element having same atomic number but different mass number are called
(A) isomers
(B) isobars
(C) Isotopes
(D) polymers
20. . The maximum number of electrons in an orbit is given by formula
(A) 2n¹
(B) 2n²
(C) 2n³
(D) 2n⁴