Lactometer is used to check purity of milk. The specific gravity of milk does not give a conclusive indication of its composition since milk contains a variety of substances that are either heavier or lighter than water. The device works on the principle of Archimedes’s principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced.

Correct Option: B

Lactometer is used to check purity of milk. The specific gravity of milk does not give a conclusive indication of its composition since milk contains a variety of substances that are either heavier or lighter than water. The device works on the principle of Archimedes’s principle that a solid suspended in a fluid will be buoyed up by a force equal to the weight of the fluid displaced.

Antoine Henri Becquerel, a French physicist, was the discoverer of radioactivity along with Marie Sklodowska-Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics. Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

Correct Option: B

Antoine Henri Becquerel, a French physicist, was the discoverer of radioactivity along with Marie Sklodowska-Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics. Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

Pharmacology is the study of drugs. It involves examining the interactions of chemical substances with living systems, with a view to understanding the properties of drugs and their actions, including the interactions between drug molecules and drug receptors and how these interactions elicit an effect.

Correct Option: C

Pharmacology is the study of drugs. It involves examining the interactions of chemical substances with living systems, with a view to understanding the properties of drugs and their actions, including the interactions between drug molecules and drug receptors and how these interactions elicit an effect.

The ABO blood group system is widely credited to have been discovered by the Austrian scientist Karl Landsteiner, who identified the O, A, and B blood types in 1900. He was awarded the Nobel Prize in Physiology or Medicine in 1930 for his work.

Correct Option: A

The ABO blood group system is widely credited to have been discovered by the Austrian scientist Karl Landsteiner, who identified the O, A, and B blood types in 1900. He was awarded the Nobel Prize in Physiology or Medicine in 1930 for his work.

The theory that gases in the atmosphere might increase Planet Earth’s temperature was first postulated by Joseph Fourier in 1827, a scientist who also seems to have coined the term “greenhouse gases.” But it wasn’t until 1896 that a research chemist by the name of Svante Arrhenius quantified the greenhouse gas theory and apparently coined the term “greenhouse effect.”

Correct Option: A

The theory that gases in the atmosphere might increase Planet Earth’s temperature was first postulated by Joseph Fourier in 1827, a scientist who also seems to have coined the term “greenhouse gases.” But it wasn’t until 1896 that a research chemist by the name of Svante Arrhenius quantified the greenhouse gas theory and apparently coined the term “greenhouse effect.”