PSC Previous Years GS Questions Part 19

PSC General Science Questions Part 19

451. In n-type semiconductor the majority carriers are:
A) Electrons
B) Holes
C) Electrons and Holes
D) None of these
Correct Option : A


452. In a given sample there are 10,000 radio-active atoms of half-life period 1 month. The number of atoms remaining without disintegration at the end of 3 months is:
A) Nil
B) 5,000
C) 2,500
D) 1,250
Correct Option : D


453. A convex lens is placed in water, its focal length:
A) Increases
B) Decreases
C) Remains the same
D) Doubled
Correct Option : A


454. Principles of law of inheritance were enunciated by:
A) Morgan
B) Mendel
C) . Bateson
D) Punnet
Correct Option : B


455. The infective stage of malarial parasite plasmodium that enters human body is:
A) Sporozoite
B) Merozoite
C) Sporozoite
D) None of the above
Correct Option : D


456. Respiratory centre in human beings is :
A) Cerebellum
B) Medulla oblongata
C) Hypothalamus
D) Cerebrum
Correct Option : B


457. Artificial ripening of fruits is accomplished by treatment with:
A) Sodium chloride
B) Indole-3 acetic acid
C) Kinetin
D) Ethylene gas
Correct Option : D


458. In mammals ammonia produced by metabolism is converted into urea in the :
A) Kidney
B) Blood
C) Liver
D) Spleen
Correct Option : C

459. What is Oil of Vitriol
A) Sodium Chloride
B) Nitric Acid
C) Sulphuric Acid
D) Hydrochloric Acid
Correct Option : C


460. Minamata disease is due to
A) Arcenic
B) Lead
C) Copper
D) Mercury
Correct Option : D


461. A person suffering from bleeding gum need in his food
A) Carotene
B) Citrus
C) Vitamin K
D) Codliver Oil
Correct Option : B


462. The take appears shallow than its actual depth, due to
A) Reflection
B) Refraction
C) Diffraction
D) Interference
Correct Option : B


463. The unit of focal power of lense is
A) Walt
B) Horse Power
C) Dioptre
D) Candella
Correct Option : C


464. The nucleus of atom consists of
A) electrones and neutrones
B) electrones and protons
C) protons and neutrons
D) all of the above
Correct Option : C


465. Potassium is kept in :
A) Water
B) Kerosene
C) Alcohol
D) Ammonia
Correct Option : B


466. What is the main content of Biogas
A) Ethane
B) Methane
C) Acetylene
D) Butane
Correct Option : B


467. . What is the metal contained is Haemoglobin
A) Copper
B) Aluminium
C) Iron
D) Magnesium
Correct Option : C


468. Who is known as Father of Indian White Revolution
A) Dr. M.S. Swaminathan
B) C.V. Raman
C) Dr. Varghese Kurian
D) Dr. Chandrasekhar
Correct Option : C

469. The impurities present in the ore is known as:
A) Flux
B) Gangue
C) Slag
D) None of these
Correct Option : B


470. Bacteria that causes Anthrax
A) Bacillus
B) Rhino
C) Varicella
D) Corona
Correct Option : A


471. The scientist who gave symbols for elements on the basis of their names
A) Lavoisier
B) Robert Boyle
C) Berzelius
D) Rutherford
Correct Option : C


472. The liquids with low viscosity are called
A) Super bug
B) mobile liquids
C) Viscous fluids
D) capillarity
Correct Option : B


473. Which instrument used to measure the flow of liquid
A) Wattmeter
B) volt meter
C) Stereoscope
D) Venturimeter
Correct Option : D


474. The phenomenon of summer sleep by animals is called
A) hibernation
B) aestivation
C) laziness
D) lethargy
Correct Option : B


475. `Calcium hydroxide` is the chemical name of ...............
A) Caustic Soda
B) Caustic Potash
C) milk of lime
D) Milk of Magnesium
Correct Option : C


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