GENERAL SCIENCE #37
MULTIPLE CHOICE QUESTIONS
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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