1. Atom consist of ----------- particles:
(A) 1
(B) 4
(C) 2
(D) 3
2. The smallest particle of an element which takes part in chemical reaction is:
(A) Molecule
(B) Proton
(C) Atom
(D) Neutron
3. Fourth state of matter is:
(A) Plasma
(B) Solid
(C) Liquid
(D) Gas
4. The mass of proton is ----------- times heavier than that of electron:
(A) 1826
(B) 1856
(C) 1836
(D) 1846
5. Mass number is sum of the masses of:
(A) Electron and Proton
(B) Electron and Neutron
(C) Proton and Neutron
(D) None
6. Charge on electron (in Coulomb) is:
(A) 1.602×10⁻²⁷
(B) 1.602×10⁻²¹
(C) 1.602×10⁻¹⁹
(D) 1.602×10⁻²³
7. Charge on proton (in Coulomb) is:
(A) 1.602×10⁻¹⁹
(B) 1.602×10⁻²³
(C) 1.602×10⁻²⁷
(D) 1.602×10⁻²¹
8. Mass of electron (in Kg) is:
(A) 9.109×10⁻²⁷
(B) 9.109×10⁻²⁹
(C) 9.109×10⁻³³
(D) 9.109×10⁻³¹
9. Mass of proton (in Kg) is:
(A) 1.672×10⁻³³
(B) 1.672×10⁻²⁹
(C) 1.672×10⁻³¹
(D) 1.672×10⁻²⁷
10. Electron was discovered by:
(A) Goldstein
(B) Max Planck
(C) John Dalton
(D) J.J Thomson
11. Electron revolves around:
(A) Nucleus
(B) Proton
(C) Neutron
(D) None of these
12. Proton was discovered by:
(A) J.J Thomson
(B) Goldstein
(C) John Dalton
(D) Max Planck
13. Percentage of carbon in wrought iron is:
(A) 0.5%
(B) 0.25%
(C) 0.75%
(D) 1%
14. H⁺ ion is also called:
(A) Electron
(B) Proton
(C) Neutron
(D) None of these
15. Which of the following is most penetrating particle of an atom:
(A) Proton
(B) Electron
(C) Alpha particles
(D) Neutron
16. Gold foil used in Rutherford experiment had thickness (cm) of:
(A) 0.0002
(B) 0.0003
(C) 0.00004
(D) 0.00003
17. Shape of S orbital is:
(A) Sphere
(B) Square
(C) Dumbbell
(D) Elliptical
18. According to Bohr, which shell has lowest energy:
(A) L
(B) O
(C) K
(D) N
19. Atomic mass is represented as:
(A) B
(B) A
(C) X
(D) Z
20. Value of Planck’s constant is:
(A) 6.625×10⁻³¹
(B) 6.625×10⁻³³
(C) 6.625×10⁻³⁴
(D) 6.625×10⁻²⁷