General Science #37 Multiple Choice Questions (MCQ) : Assam Jobs Guide

GENERAL SCIENCE #37

MULTIPLE CHOICE QUESTIONS

General Science : Multiple Choice Questions (MCQ) : Assam Jobs Guide

1. Who discovered the electron?

(a) Rutherford

(b) Chadwick

(c) Thomson

(d) Goldstein

Answer: (c)

2. Which isotope is used in the nuclear power plants to generate electricity?

(a) Uranium 235

(b) Iodine 131

(c) Cobalt 60

(d) Uranium 238

Answer: (a)

3. Why was the Thomson’s Model of an atom failed?

i. It could not explain the screening of negative charges from that of positive

ii. It did not tell about the presence of electrons

iii. It did not give an idea about the discrete energy levels

iv. It explained the atom as a whole to be electrically neutral

Choose the correct option from the following:

(a) Only (iii)

(b) Both (i) & (iii)

(c) Only (i)

(d) Both (ii) & (iv)

Answer: (b)

4. What was the source of alpha particles in Rutherford scattering experiment?

(a) Hydrogen nucleus

(b) Argon nucleus

(c) Helium nucleus

(d) None of the above

Answer: (c)

5. What property of an element determines its chemical behaviour?

(a) Size of an element

(b) Valency of an element

(c) Molar mass of the element

(d) None of the above

Answer: (b)

6. Which of the following does not match the characteristics of an Isotope?

(a) Isotopes of some elements are radioactive

(b) Isotopes are the atoms of different elements

(c) Isotopes differ in number of neutrons

(d) Isotopes have similar chemical properties

Answer: (b)

7. Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?

(a) Chlorine

(b) Sulphur

(c) Both are equally reactive

(d) Can’t say

Answer: (a)

8. Which of the following elements does not exhibit the electrovalency?

(a) Sodium

(b) Calcium

(c) Carbon

(d) Chlorine

Answer: (c)

9. Which of the following statements is incorrect about the structure of an atom?

i. The whole mass of an atom is concentrated in the nucleus

ii. The atom is an indivisible particle

iii. The atom as a whole is neutral

iv. All the atoms are stable in their basic state

Choose the right option among the following:

(a) (i) and (iii)

(b) only  (ii)

(c) (ii) and (iv)

(d) None of the above

Answer: (c)

10. Which scientist gave the concept of fixed energy levels around the nucleus?

(a) Ernest Rutherford

(b) Neils Bohar

(c) J.J. Thomsan

(d) None of the above

Answer: (b)

11. What prevents an atom from being collapsed?

(a) The nuclear forces

(b) Movement of electrons in discrete energy levels

(c) The electron-electron repulsions

(d) All of these

Answer: (b)

12. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?

(a) Some of the α-particles rebound after hitting the gold foil

(b) Some of the particles deflected from their path

(c) Some of the particles not pass through the gold foil

(d) Most of the particles pass straight through the gold foil

Answer: (a)

13. Which radioactive element is used in the treatment of cancer?

(a) Iodine-131

(b) Uranium-234

(c) Plutonium-239

(d) Cobalt-60

Answer: (d)

14. Why do most of the elements try to participate in the chemical combinations?

i. To gain more electrons

ii. To achieve Inert Gas configuration

iii. To complete their octet

iv. To complete their inner shells

Choose the correct option among the following:

(a) Both (i) & (iii)

(b) Both (ii) & (iii)

(c) Only (ii)

(d) Both (i) & (iv)

Answer: (b)

15. An element has electronic configuration 2, 6; the element is …………

(a) Carbon

(b) Nitrogen

(c) Oxygen

(d) Fluorine

Answer: (c)

16. The radioactive isotope used in the treatment of cancer is …………

(a) Plutonium-239

(b) Arsenic-74

(c) Cobalt-60

(d) Iodine-131

Answer: (c)

17. The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of ………….

(a) 1

(b) 2

(c) 3

(d) 4

Answer: (b)

18. The number of valence electrons in Mg are …………

(a) 1

(b) 2

(c) 3

(d) 4

Answer: (b)

19. Elements having valency ‘one’ are ……………

(a) always metals

(b) always non-metals

(c) always metalloids

(d) either metals or metalloids

Answer: (d)

20. Which of following has one valence electron?

(a) Li

(b) Ca

(c) Mg

(d) Be

Answer: (a)

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