Chemistry Chapter 2 Entry Test MCQs
Topic no.2
Cathode Rays
1. From discharge tube experiments, it is concluded that
a. Nucleus contains positive charge
b. Mass of proton is in fraction
c. Positive rays are always lighter than cathode rays
d. Matter contains electrons
2. Which property of cathode rays is true?
a. It deflects upward in magnetic
b. It deflects towards negative electric plate
c. It produces green fluorescence on alumina
d. All are incorrect
3. Pressure in gas discharge tube was kept __ to produce cathode rays
a. 0.1torr
b. 10torr
c. 0.01torr
d. 1torr
Canal Rays
4. Which order of mass is correct in ascending order
a. e– < p+ < n
b. e– > p° > n
c. n > p+ > e–
d. e– < n < p+
5. Positive rays give flash on
a. ZnO
b. AgNO3 plate
c. ZnS
d. AgCl plate
6. The heaviest particle among all four given particles is:
a. neutron
b. Alpha particle
c. electron
d. proton
7. The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), and alpha particle (a) is:
a. p, e, a
b. p, a, e
c. e, p, a
d. a, p, e
8. The e/m value is maximum for which of the following gas?
a. oxygen
b. Hydrogen
c. nitrogen
d. helium
9. The ratio of e/m values of a proton and an α-particle is:
a. 1: 1
b. 2: 1
c. 1: 4
d. 1: 2
10. A proton is identical to:
a. Ionized H
b. ionized H2
c. hydronium ion
d. alpha particle
11. The nature of positive rays depends on the nature of:
a. Residual gas
b. Cathode rays
c. Discharge tube
d. All of these
12. Anode rays were discovered by:
a. Thomson
b. Stoney
c. Goldstein
d. Rutherford
Neutrons
13. Consider the following nuclear transformation and tell the change in number of neutrons during this transformation (Ra → Rn) 𝑹𝒂𝟖𝟖𝟐𝟐𝟔 → 𝑹𝒏𝟖𝟔𝟐𝟐𝟐 +𝑯𝒆𝟐+
a. 138 to 136
b. 120 to 118
c. 136 to 138
d. 130 to 128
14. The mass of neutron lies in the range of:
a. 1.6750 x 10-27Kg
b. 1.6750 x 10-23Kg
c. 1.6750 x 10-26Kg
d. 1.6750 x 10-24Kg
15. Consider the following reaction 4Be + 2He → 6C + 1n This reaction is
a. A nuclear reaction
b. An exothermic reaction
c. An example of artificial radioactivity
d. All of these
16. Which of the following are not able to ionize the gas?
a. γ-rays
b. α-rays
c. Neutrons
d. β-rays
17. A fast-moving neutron can eject from nitrogen
a. β – rays
b. γ – rays
c. Electron
d. α – rays
18. Which rays are more penetrating in nature?
a. γ-rays
b. α-rays
c. Neutrons
d. β-rays
19. Mass of a neutron may be equal to
a. mass of proton
b. sum of masses of proton + electron + neutrino
c. mass of electron and positron
d. sum of mass of proton + positron
Atomic Models, Experiments and Theories
20. The maximum mass of an atom is concentrated in which of these?
a. Protons
b. Nucleus
c. Electrons
d. Neutrons
21. What happens to the atomic number during a chemical reaction?
a. It changes
b. It increases
c. Remains the same
d. Changes alternatively
22. Which of the following will have same number of electrons as alpha particles?
a. H+
b. Li+
c. Be+
d. He+
23. Splitting of spectral lines when atoms are subjected to electric field:
a. Compton effect
b. Zeeman effect
c. photoelectric effect
d. Stark effect
24. The ionization energy value of hydrogen
a. -1313 kJ/mol/n2
b. -1313 kJ/mol
c. 496 kJ/mol
d. 1313 kJ/mol
25. A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength
a. 1.0 × 10-32 m
b. 6.6 × 10-34 m
c. 1.0 × 10-35 m
d. 6.6 × 10-32 m