- What is “heavy water” used in nuclear reactors?
a) Water rich in minerals
b) Ozonised water
c) Water with heavy metal minerals
d) Water containing heavy isotope of hydrogen
Answer: d - Which of the following is not a radioactive element?
a) Uranium
b) Thorium
c) Radium
d) Cadmium
Answer: d - Who discovered radioactivity in 1898?
a) Henri Becquerel
b) J.J. Thomson
c) Marie Curie
d) Pierre Curie
Answer: a (Note: Becquerel discovered it in 1896, not 1898. Marie Curie made key discoveries in 1898.) - Why are radioactive samples stored in lead boxes?
a) Because lead is heavy
b) Because it is strong
c) Because it absorbs radiation well
d) Because it’s a poor conductor
Answer: c - An endothermic reaction is one in which:
a) Heat is released
b) Heat is absorbed
c) No heat change occurs
d) None of the above
Answer: b - Nuclear forces are:
a) Charge-independent
b) Spin-independent
c) Charge-symmetric
d) Long-range
Answer: a - Which feature is typical of an exothermic reaction?
a) Release of heat
b) Absorption of heat
c) No temperature change
d) None of these
Answer: a - Which is the lightest radioactive element?
a) Deuterium
b) Polonium
c) Tritium
d) Uranium
Answer: c - What is commonly used as a coolant in nuclear reactors?
a) Water
b) Uranium
c) Graphite
d) Boron
Answer: a - Which element does not occur naturally but can be made artificially?
a) Thorium
b) Radium
c) Plutonium
d) Uranium
Answer: c - What is used as a control rod material in nuclear reactors?
a) Sodium
b) Uranium
c) Graphite
d) Boron
Answer: d - Which of the following is a radioactive element?
a) Cobalt
b) Uranium
c) Argon
d) Chromium
Answer: b - Radiocarbon dating is used to estimate the:
a) Soil contamination
b) Water content in fossils
c) Age of fossils
d) Quality of soil
Answer: c - Radioactive elements emit:
a) Radiowaves
b) Infrared waves
c) Ultraviolet waves
d) Alpha, Beta, and Gamma radiations
Answer: d - Which rays are essential for radiocarbon dating?
a) UV rays
b) IR rays
c) Cosmic rays
d) X-rays
Answer: c - What caused radioactive pollution along Kerala’s coast?
a) Plutonium
b) Zinc
c) Thorium
d) Radium
Answer: c - What technique uses radioactivity to determine the age of prehistoric materials?
a) Radium dating
b) Uranium dating
c) Carbon dating
d) Deuterium dating
Answer: c - Which of the following elements is not naturally radioactive?
a) Uranium
b) Thorium
c) Aluminium
d) Polonium
Answer: c - Curie point refers to the temperature at which:
a) Matter becomes radioactive
b) Metal loses magnetic properties
c) Metal becomes a poor conductor
d) Metal transmutes
Answer: b - The instability of a nucleus is primarily due to:
a) High electron-to-proton ratio
b) High neutron-to-proton ratio
c) Low electron-to-proton ratio
d) Low neutron-to-electron ratio
Answer: b - Which radioactive isotope is used in treating skin diseases?
a) Lead
b) Cobalt
c) Phosphorus
d) Iodine
Answer: b - Which of the following nuclei is unstable?
a) ⁵B¹⁰
b) ⁴Be¹⁰
c) ⁷N¹⁴
d) ⁸O¹⁶
Answer: b