The Atomic Structure - Chapter No 3

Right Answers have been shown below in red color.

1. Universe is made up of.

a) Matter
b) Space
c) Energy
d) All of three

2. Conduction of electricity through any gas may be studied at any value of.

a) High pressure
b) Low pressure
c) Moderate pressure
d) None of these

3. Cathode rays emitted from the cathode are.

a) Canal rays
b) Protons
c) Electrons
d) Positrons

4. Charge to mass ratio (e/m) of the electron is determined by.

a) R.A. Millikan
b) J.J. Thompson
c) G.J. Stoney
d) None of these

5. The beam attracted towards the negatively charged plate is.

a) Alpha particles
b) Neutron
c) Beta particles
d) Gamma particles

6. Beta-rays are fast-moving.

a) Neutrons
b) position
c) Electrons
d) Deuteron

7. Which rays carry no charge and are nonmaterial in nature?

a) Alpha
b) Beta
c) Gamma
d) None of these

8. Neutron possesses.

a) Positive charge
b) Negative charge
c) No charge
d) None of these

9. Which radiations are of very high frequency?

a) IR
b) UV
c) Visible
d) X-Rays

10. Rutherford bombarded thin gold foil with۔

a) Beta particles
b) Neutron
c) Alpha particles
d) Electron

11. The nucleus is surrounded by a number of electrons equal to the number of

a) Neutron
b) Proton
c) Negatron
d) Positron

12. According to Rutherford’s model, the nucleus is surrounded by

a) Proton
b) Neutron
c) Positron
d) electron

13. The neutron particle:

a) has a mass of 1 gm
b) has a mass approx. equal to that of proton
c) has a charge equal to that of electron
d) has negligible mass

14. The 2Pِx, 2Py, and 2Pz orbital of an atom have identical shapes but differ in their:

a) size
b) orientation
c) shape
d) none of these

15. Number of protons, neutrons, and electrons respectively present in Sodium are:

a) 11, 11, 12
b) 11, 12, 12
c) 12, 11, 11
d) 11, 12, 11

16. Which of the following light waves has the highest energy?

a) Ultraviolet radiation
b) Infrared radiation
c) Visible light
d) X-rays

17. How many orbitals exist with the principal quantum number 3?

a) 2
b) 9
c) 3
d) 4

18. Among the following, the electron with the highest energy is:

a) n = 3, l = 2, m = 0, s = ± ½
b) n = 4, l = 0, m = 0, s = ± ½
c) n = 4, l = 0, m = 1, s = ± ½
d) n = 3, l = 0, m = 0, s = ± ½

19. The particles present in anode rays are:

a) Positively charged particles
b) Electrons
c) alpha particles
d) Beta particles

20. How many neutrons are present in the 92U238?

a) 92
b) 238
c) 146
d) 330

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