General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
41. Which of the following is not pure endocrine gland?
[A] Thyroid gland
[B] Thymus gland
[C] Pancreas
[D] Adrenal
Show Answer
Correct Answer: C [Pancreas]
Notes:
The pancreas and gonads are two glands that are not pure endocrine. The pancreas secretes both hormones and enzymes and acts as both endocrine and exocrine.
42. Which of these is not a biological agent that causes disease?
[A] Mycoplasma
[B] Virus
[C] Radiations
[D] Fungi
Show Answer
Correct Answer: C [Radiations]
Notes:
Radiations are not a biological agent that causes disease. Its physical agents cause disease along with electricity, pressure, heat, cold, etc.
43. Colour blindness is an __ linked recessive trait.
[A] Z chromosome
[B] Y chromosome
[C] X chromosome
[D] None of these
Show Answer
Correct Answer: C [X chromosome]
Notes:
Usually, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance.
44. How are ‘anions’ formed?
[A] Addition of electron
[B] Removal of electron
[C] Addition of proton
[D] Removal of proton
Show Answer
Correct Answer: A [Addition of electron]
Notes:
Anions are negative ions that are formed when a non-metal atom gains one or more electrons. They are formed by the addition of electrons. Anions are so named because they are attracted to the anode (positive field) in an electric field. Atoms typically gain electrons so that they will have the electron configuration of a noble gas.
45. Which is the purest commercial form of iron?
[A] Pig iron
[B] Steel
[C] Stainless steel
[D] Wrought iron
Show Answer
Correct Answer: D [Wrought iron]
Notes:
Wrought iron or malleable weldable form iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe2O3 which oxidizes C, Si, P, etc, most of which are then removed by rolling.
46. Which of the following is not a gaseous air pollutant?
[A] Oxides of nitrogen
[B] Hydrocarbon
[C] Smoke
[D] Oxides of sulphur
Show Answer
Correct Answer: B [Hydrocarbon]
Notes:
The gaseous air pollutants of primary concern in urban settings include oxides of carbon, sulphur and nitrogen such as sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels.Smoke, a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. On combustion, it produces carbon dioxide and water only.
47. The chemical name of ‘‘Hypo’’ commonly used in photography is:
[A] Sodium thiosulphate
[B] Silver nitrate
[C] Sodium nitrate
[D] Silver iodide
Show Answer
Correct Answer: A [Sodium thiosulphate]
Notes:
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be easily removed when the film is washed.
48. Ethylene is a ______ molecule:
[A] polar
[B] ionic
[C] covalent
[D] nonpolar
Show Answer
Correct Answer: D [nonpolar]
Notes:
Ethylene (C2H4) is a nonpolar molecule. This is because, unlike a polar molecule, it has an even distribution of electrical charges. Since, the double bond is between two carbon atoms, there is no difference in the electronegativity. This is why, the shared pair of electrons come lie in between those to carbon atoms. As a result, ethylene is a non-polar and linear molecule.
49. Which of the following is also known as Carbolic Acid?
[A] Phenol
[B] Hydroxide
[C] Sulphuric Acid
[D] Ethanol
Show Answer
Correct Answer: A [Phenol]
Notes:
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. The molecule consists of a phenyl group (–C6H5) bonded to a hydroxyl group (–OH). It is primarily used to synthesize plastics and related materials.
50. Which of the following is not an example of a biomass energy source?
[A] Wood
[B] Gobar gas
[C] Atomic energy
[D] Coal
Show Answer
Correct Answer: C [Atomic energy]
Notes:
Biomass energy is a renewable and sustainable source of energy derived from organic matter and can be used to generate electricity and other forms of power. Common materials that can be used to develop biomass fuel include manure, forest debris, scrap lumber, mulch, sewage, certain crops and some kinds of waste residue. It does not include Atomic energy.
