11th class (FSc) chemistry Unit 5 MCQs
Chapter 5 MCQs 11th Class Chemistry
Atomic Structure:
1. Negative charge on cathode rays was established by:
a. J.J Thoomson
b. Williom crook
c. Hitttrof
d. J.Perin
2. Cathode rays strike alumina and produce a …… colour.
a. Yellow
b. Red
c. Green
d. Blue
3. Name of the electron is given by:
a. J.J Thomson
b. William Brook
c. Chadwick
d. Stoney
4. The e/m value for the positive rays is maximum for the gas:
a. Oxygen
b. Hydrogen
c. Nitrogen
d. Helium
5. The nature of positive rays depend on:
a. The nature of residual gas
b. The nature of electrons
c. The nature of voltage supplied
d. The nature of discharge tube
6. Positive rays were discovered by;
a. William Crookes
b. J.J Thomson
c. Rutherford
d. Goldstein
7. Positive ions are called:
a. Canal rays
b. Cations
c. Hydrated ions
d. Anions
8. The charge on proton is:
a. 1.6022 x 10-19C
b. 1.6022 x 10-11C
c. 1.6022 x 1019C
d. 1.6022 x 1011C
9. Number of neutrons present in3919K is:
a. 39
b. 20
c. 18
d. 19
10. 29/65 Cu +1/0n →29/66 Cu + ” X “=?
a. Beta rays
b. Electrons
c. Gamma rays
d. Proton
11. How many times the mass of neutron is greater than that of electron?
a. 200
b. 1480
c. 1840
d. 2000
12. Free electons decays into a proton with the emission of an electron?
a. Beta particle
b. Positron
c. Helium nucleus
d. Neutrione
13. Neutron was discovered by:
a. Rutherford
b. Chadwick
c. Goldstein
d. C.D Anderson
14. When beta particles is emitted from the nucleus of an atom its:
a. Atomic mass increases by 1
b. Atomic number increases by 1
c. Atomic mass decreases by 1
d. Atomic number decreases by 1
15. Rutherford model failed beause:
a. It did not account for stability of the atom
b. The atom did not have a nucleus
c. There is no space between nucleus and the electrons
d. It did not account for the attraction between protons and neutrons
16. The wave number of light emitted by a certain source 2 x 106m-1 The wavelengths of this light will be:
a. 200 m
b. 500 nm
c. 5 x 107m
d. 500 m
17. The velocity of proton is:
a. Equal to square of its amplitude
b. Independent of its wavelength
c. Depends on its wavelength
d. Depends on its source
18. Properties of wave are:
a. Frequency
b. Wavelength
c. Wave number
d. All
19. The value of Planck’s constant is:
a. 6.62 x 10-31J.s
b. 6.62 x 10-34J.s
c. 6.62 x 10-33J.s
d. 6.62 x 10-27J.s
20. Bohr’s theory was introduced in:
a. 1906
b. 1900
c. 1913
d. 1911
21. According to Bohr’s atomic model, radius of second orbit of hydrogenatom is:
a. 4.0oA
b. 0.529oA
c. 5.0oA
d. 2.116oA
22. Total number of spectral regions in a spectrum is:
a. 7
b. 4
c. 8
d. 6
23. Which one of the following series lie in ultra-violet region?
a. Paschen
b. Lyman
c. Brackett
d. Balmer
24. Balmar series is found in:
a. Visible region
b. I.R region
c. U.V region
d. None of these
25. The limiting line of Balmer series lies in:
a. I.R region
b. Visible region
c. X-rays region
d. U.V region