1000 Best General Science MCQ-Questions
Q153). The isotope of uranium capable of sustaining chain reaction is
a).U-235
b).U-245
c).U-239
d).U-238
Correct Answer:
U-235
Explanation:
Q154). The age of most ancient geological formations is estimated by
a).Ra – Si method
b).Potassium – argon method
c).C method
d).Uranium – lead method
Correct Answer:
Uranium – lead method
Explanation:
Q155). Who suggested that most of the mass of the atom is located in the nucleus?
a).Thompson
b).Bohr
c).Rutherford
d).Einstein
Correct Answer:
Rutherford
Explanation:
Q156). The dark lines in the solar spectrum are due to
a).absorption of corresponding wavelengths by the outer layers of the sun
b).destructive interference between waves of certain definite wavelengths
c).absorption of corresponding wavelengths by the prism used in the photograph
d).absence of corresponding wavelengths from the light emitted by the core of the sun
Correct Answer:
absorption of corresponding wavelengths by the outer layers of the sun
Explanation:
Q157). In an atomic nucleus, neutrons and protons are held together by
a).gravitational forces
b).exchange forces
c).coulombic forces
d).magnetic forces
Correct Answer:
exchange forces
Explanation:
Q158). ‘No two electrons in an atom can have the same set of four quantum numbers’ is
a).Newton’s law
b).Bohr’s law
c).Aufbau principle
d).Pauli’s exclusion principle
Correct Answer:
Pauli’s exclusion principle
Explanation:
Q159). According to Avogadro’s Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
a).a molecule
b).a cation
c).an anion
d).an atom
Correct Answer:
a molecule
Explanation:
Q160). Atoms of an element differ from those of all other elements in
a).atomic number and electronic configuration
b).number of neutrons and number of valence electrons
c).atomic number and number of valence electrons
d).number of neutrons and electronic configuration
Correct Answer:
atomic number and electronic configuration
Explanation: