chemistry multiple choice questions(50) with answer
TRANSCRIPT
Multiple choice questions
Q 1 Who is regarded as father of modern chemistry ?
• Ruterford
• Einstein
• Lavoisier
• C.V Raman
Answer: Lavoisier
Q2. Identify the wrong statement in the following?
• Atomic radius of the elements increases as one moves down the first group of the periodic table
• Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
• Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
• Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
Answer: Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Q3. The term PVC used in the plastic industry stands for
• Polyvinyl chloride
• Polyvinyl carbonate
• Phosphor vanadiu chloride
• Phosphavinyl chloride
Answer: Polyvinyl chloride
Q4. The number of moles of solute present in 1 kg of a solvent is called its
• Molality
• Molarity
• Normality
• Formality
Answer: Molality
Q5. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
• Granite
• Basalt
• Igneous rocks
• Sedimentary rocks
Answer: Igneous rock
Q6. The octane number of zero is assigned to
• 2- methyl octane
• N- heptane
• Iso- octane
• 3- methyl octane
Answer: n-heptane
Q7. Which is used in preparation of dynamite ?
• Glycerol
• Ethyl alochol
• Methyl alcohol
• Glycol
Answer: Glycerol
Q8. Bleaching action of chlorine is by
• Decomposition
• Gydrolysis
• Reduction
• Oxidation
Answer: Decomposition
Q9. What is a mixture of potassium nitrate powdered charcoal and sulphur called?
• Paint
• Aluminium
• Brass
• Gun powder
Answer: Gun powder
Q10. Nail polish remover contains ?
• Benzene
• Acetic acid
• Acetone
• Petroleum ether
Answer: Acetone
Q11. The isotope atoms differ in ?
• Number of protons
• Atomic number
• Number of electrons
• Atomic weight
Answer: number of electrons
Q12. Natural rubber is polymer derived from ?
• Ethylene
• Propylene
• Isoprene
• Butadiene
Answer: isoprene
Q13. Which is also called Stranger Gas ?
• Xenon
• Neon
• Argon
• Nitrous oxide
Answer: Xenon
Q14. The chemical used as a fixer in photography is ?
• Sodium thio sulphate
• Sodium sulphate
• Borax
• Ammonium sulphate
Answer: sodium thio sulphate
Q15. Water drops are spherical because of ?
• Viscosity
• Density
• Polarity
• Surface tension
Answer: surface tension
Q16. he oxide of Nitrogen used in medicine as anaesthetic is ?
• Nitrogen pentoxide
• Nitrous oxide
• Nitric oxide
• Nitrogen dioxide
Answer: nitrogen pentoxide
Q17. Which one of the following metals does not react with water to produce Hydrogen?
• Cadmium
• Lithium
• Potassium
• Sodium
Answer: cadmium
Q18. The most electronegative element among the following is
• Sodium
• Bromine
• Fluorine
• Oxygen
Answer: fluorine
Q19. The metal used to recover copper from a solution of copper sulphate is ?
• Na
• Ag
• Hg
• Fe
Answer: Fe
Q20 The metallurgical process in which a metal is obtained in a fused state is called ?
• Roasting
• Calcinations
• Smelting
• Froth floatation
Answer: smelting
Q21. Which of the following is produced during the formation of photochemical smog ?
• Nitrogen oxides
• Hydrocarbons
• Methane
• Ozone
Answer: ozone
Q22. Which of the following gas is used in cigarette lighters ?
• Butane
• Propane
• Methane
• Ethane
Answer: butane
Q23. Iodine can be separated from a mixture of Iodine and Potassium Chloride by ?
a) Filtration
b) Sublimation
c) Distillation
d) Sedimentation
Answer: sublimation
Q24. The material which can be deformed permanently by heat and pressure is called a
• Thermoset
• Thermoplastic
• chemical compound
• Polymer
Answer: thermoset
Q25. . Conduction band electrons have more mobility than holes because they are
• experience collision more frequently
• experience collision less frequently
• have negative charge
• need less energy to move them
Answer: experience collision less frequently
Q26. The gas used for artificial ripening of green fruit is ?
• Ethane
• Ethylene
• carbon dioxide
• Acetylene
Answer: ethylene
Q27. The main chemical constituent of clay is ?
• aluminium silicate
• Zeolites
• aluminium borosilicate
• silicon oxide
Answer: aluminium silicate
Q28. What is hottest part of the gas flame is called ?
• blue zone
• luminous zone
• dark zone
• non-luminous zone
Answer: non-luminous zone
Q29. Permanent hardness of water is due to the presence of ?
• Magnesium bicarbonate
• Calcium bicarbonate
• Sodium bicarbonate
• Calcium sulphate
Answer: Calcium sulphate
Q30. Sugars are converted in the liver into
• Glycogen
• Vitamin
• Monosaccharide
• None of above
Answer: glycogen
Q31. The ejection of electrons when a metal surface is irradiated is known as
• Black body radiation
• Photoelectric effect
• Zeeman effect
• Atomic spectrum
Answer: photoelectric effect
Q32. Which of the following gases is the most toxic?
• Carbon dioxide
• Sulphur dioxide
• Carbon monoxide
• Acetic acid
Answer: carbon monoxide
Q33. Which of the following elements behave chemically both as a metal and a non metal?
• Boron
• Carbon
• Argon
• Mercury
Answer: boron
Q34. Why is phosphorus kept under water ?
• to make it wet
• to make it durable
• water forms a protective coating on it
• to save it from catching fire when exposed to dry air
Answer : to save it from catching fire when exposed to dry air
Q35. What is extracted from Bauxite ?
• Mica
• Aluminium
• Copper
• Tin
Answer: aluminium
Q36. Brass is an alloy of ?
• Copper and Tin
• Copper and Zinc
• Copper and Aluminium
• Iron and Copper
Answer: copper and zinc
Q37. Contact lenses are made from ?
• Polyvinyl chloride
• Teflon
• Polystyrene
• Lucite
Answer: Polyvinyl chloride
Q38. The single acid which dissolves gold is ?
• Aqua regia
• Hydrochloric acid
• Nitric acid
• Selenic acid
Answer: aqua regia
Q40. How many different oxides are formed by nitrogen ?
• Two
• Three
• Four
• Five
Answer: two
Q41. The major component used in preparation of different types of glasses is :
• Sodium borate
• Sodium silicate
• Silica
• Calcium silicate
Answer: silica
Q42. What is metallurgy ?
• process of extracting metal in pure form from its ore.
• process of creating alloys of metals.
• process of making metals live long.
• None of above.
Answer: process of extracting metal in pure form from its ore
Q42. Which have maximum number of isotopes ?
• Bromine
• Aluminium
• Polonium
• Carbon
Answer: polonium
Q43. Which prefix is often used with scientific terms to indicate that something is the same, equal or constant
• Iso
• Mega
• Meta
• Quasi
Answer: iso
Q44. Superconductivity is a material property associated with
• cooling a substance without a phase change
• frictionless liquid flow
• a loss of thermal resistance
• a loss of electrical resistance
Answer: a loss of electrical resistance
Q45. Which of the following is primarily composed of calcium carbonate?
• Fish scales
• Shark teeth
• Oyster Shells
• Whale bones
Answer: oyster shells
Q46. Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid
• Increases
• Decreases
• Stays the same
• None of the above
Answer: increases
Q47. Vacuoles are bound by a definite membrane in plant cells called
• Plasma membrane
• Tonoplast
• Cell wall
• None of the above
Answer: Tonoplast
Q48. The wonder pigment chlorophyll is present in
• Mitochondria
• Centrosomes
• Quantosomes
• Lysosomes
Answer: Quantosomes
Q49. The concept of carbon credit originated from which one of the following?
• Earth Summit, Rio de Janeiro
• Kyoto Protocol
• Montreal Protocol
• G-8 Summit, Hciligendamm
Answer: Kyoto protocol
Q50. Select the one which is not a mixture
• Air
• Gasoline
• LPG
• Distilled water
Answer: distilled water
Efforts byvibhor agarwal