PSC Previous Years GS Questions Part 13

PSC GS QB Part 13

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• 301. Which of these elements belong to the halogen family?
• A) Fluorine
  B) Iron
  C) Potassium
  D) Oxygen
• Answer
• Correct Option : A
• Explanation

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• 302. The property of light which is made use in optical fibres is
• A) Scattering
  B) total internal reflection
  C) refraction
  D) diffraction
• Answer
• Correct Option : B
• Explanation

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• 303. Which of these electro magnetic waves is made use in taking photographs of distant objects?
• A) X- Rays
  B) Radio waves
  C) Infrared
  D) Microwaves
• Answer
• Correct Option : C
• Explanation

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• 304. Atoms having the same number of neutrons are called?
• A) Isobar
  B) Isotope
  C) Isotone
  D) Isomer
• Answer
• Correct Option : C
• Explanation

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• 305. Which of the following glands secretes the hormone melatonin?
• A) Adrenal
  B) Pineal
  C) Hypothalamus
  D) Pituitary
• Answer
• Correct Option : B
• Explanation

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• 306. Which of the following body parts is affected by filariasis?
• A) Joints
  B) Lymph nodes
  C) Bones
  D) None of these
• Answer
• Correct Option : B
• Explanation

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• 307. A group of specific proteins produced by mammals to defend themselves from foreign organisms or chemicals are called?
• A) Antigen
  B) Antibody
  C) Hormones
  D) Enzymes
• Answer
• Correct Option : B
• Explanation

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• 308. Most of the light rays inside a tube light is in the form of
• A) Visible light
  B) Infrared light
  C) Bright light
  D) Ultraviolet light
• Answer
• Correct Option : D
• Explanation

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• 309. Which disease is caused by the disintegration of motor neurons in the brain?
• A) Addison’s disease
  B) Acromegaly
  C) Parkinson’s disease
  D) Cushing’s Syndrome
• Answer
• Correct Option : C
• Explanation

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• 310. Which of the following is not associated with the process of blood clotting?
• A) Fibrinogen
  B) Calcium
  C) Vitamin K
  D) Haemoglobin
• Answer
• Correct Option : D
• Explanation

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• 311. Who introduced the term ‘Gene’ for the hereditary factors?
• A) Wilhelm Johannsen
  B) Grigor Mendel
  C) Alice Jeffrey
  D) Har Govind Khorana
• Answer
• Correct Option : A
• Explanation

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• 312. By which name are 16th group elements known?
• A) Carbon family
  B) Nitrogen family
  C) Oxygen family
  D) Halogen family
• Answer
• Correct Option : C
• Explanation

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• 313. Who introduced the Plum pudding model of atom?
• A) J.J.Thomson
  B) John Dalton
  C) Niels Bohr
  D) Ernest Rutherford
• Answer
• Correct Option : A
• Explanation

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• 314. In which year did Max Plank get Nobel prize for quantum theory of light?
• A) 1916
  B) 1905
  C) 1918
  D) 1917
• Answer
• Correct Option : C
• Explanation

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• 315. If the velocity of a moving object is doubled its kinetic energy will be:
• A) Doubled
  B) Tripled
  C) Halved
  D) Four times
• Answer
• Correct Option : D
• Explanation

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• 316. The ultimate cause of water movement in a plant stem against gravity is?
• A) Osmosis
  B) transpiration
  C) photosynthesis
  D) diffusion
• Answer
• Correct Option : B
• Explanation

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• 317. Which one of the following is the unit of activity of a radioactive source?
• A) Lux
  B) Becquerel
  C) Tesla
  D) Siemens
• Answer
• Correct Option : B
• Explanation

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• 318. Glass is a _________
• A) Vitrified liquid
  B) crystalline mateiral
  C) semi-solid
  D) sublimation of iodine
• Answer
• Correct Option : A
• Explanation

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• 319. The term ‘light year’ is a unit employed in measuring
• A) intensity of light
  B) distance
  C) speed of light
  D) time
• Answer
• Correct Option : B
• Explanation

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• 320. Which is not an alkali metal.
• A) Sodium
  B) Potassium
  C) Caesium
  D) Gallium
• Answer
• Correct Option : D
• Explanation

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• 321. The organic acid present in tomato
• A) Oxalic acid
  B) Acetic acid
  C) Lactic acid
  D) Citric acid
• Answer
• Correct Option : A
• Explanation

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• 322. The central control of respiratory activity in human body is exercised by
• A) Cerebrum
  B) Cerebellum
  C) Medulla Oblongata
  D) Hypothalamus
• Answer
• Correct Option : C
• Explanation

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• 323. Which of the following branch of science deals with the study of human race?
• A) Ethology
  B) Ecology
  C) Anthropology
  D) Ichthyology
• Answer
• Correct Option : C
• Explanation

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• 324. Which of the following is not an ore of iron?
• A) Hematite
  B) Magnetite
  C) Limonite
  D) Dolomite
• Answer
• Correct Option : D
• Explanation

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• 325. Which of the following is used as an anti-coagulant in blood banks?
• A) Sodium citrate
  B) Sodium benzoate
  C) Silver bromide
  D) Silver iodide
• Answer
• Correct Option : A
• Explanation

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