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Sunday, 10 January 2016

Synthetic Materials MCQS

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                                     Synthetic Materials MCQS
1. 
 Which is/are the important raw material(s) required in cement industry?
A.
Gypsum and Clay
B.
Clay
C.
Limestone and Clay
D.
Limestone
Answer & Explanation
Answer: Option C

2. 
 Which type of fire extinguisher is used for petroleum fire?
A.
Powder type
B.
Liquid type
C.
Soda acid type
D.
Foam type
Answer & Explanation
Answer: Option A
3. 
 Which of the following is commonly called a 'polyamide'?
A.
Terylene
B.
Nylon
C.
Rayon
D.
Orlon
Answer & Explanation
Answer: Option B
4. 
 Epoxy resins are used as
A.
detergents
B.
insecticides
C.
adhesives
D.
moth repellents
Answer & Explanation
Answer: Option C
5. 
 Detergents used for cleaning clothes and utensils contain?
A.
bicarbonates
B.
bismuthates
C.
sulphonates
D.
nitrates
Answer & Explanation
Answer: Option C

6. 
 Which of the following is used for removing air bubbles from glass during its manufacture?
A.
Arsenous oxide
B.
Potassium carbonate
C.
Soda ash
D.
Feldspar
Answer & Explanation
Answer: Option A
7. 
 Which of the following is a protein?
A.
Natural rubber
B.
Starch
C.
Cellulose
D.
None of these
Answer & Explanation
Answer: Option A
8. 
 Wood is the main raw material for the manufacture of
A.
paint
B.
paper
C.
ink
D.
gun powder
Answer & Explanation
Answer: Option B
9. 
 Rayon is chemically
A.
cellulose
B.
pectin
C.
glucose
D.
amylase
Answer & Explanation
Answer: Option A
10. 
 Optic fibres are mainly used for which of the following?
A.
Musical instruments
B.
Food industry
C.
Weaving
D.
Communication
Answer & Explanation
Answer: Option D

11. 
 The major ingredient of leather is
A.
collagen
B.
carbohydrate
C.
polymer
D.
nucleic acid
Answer & Explanation
Answer: Option A
12. 
 What are the soaps?
A.
Salts of silicates
B.
Mixture of glycerol and alcohols
C.
Sodium or potassium salts of heavier fatty acids
D.
Esters of heavy fatty acids
Answer & Explanation
Answer: Option C
13. 
 How does common salt help in separating soap from the solution after saponification?
A.
By decreasing density of Soap
B.
By decreasing solubility of Soap
C.
By increasing density of Soap
D.
By increasing solubility of Soap
Answer & Explanation
Answer: Option B
14. 
 In vulcanisation, natural rubber is heated with
A.
Carbon
B.
Silicon
C.
Sulphur
D.
Phosphorous
Answer & Explanation
Answer: Option C
15. 
 Deep blue colour is imparted to glass by the presence of
A.
cupric oxide
B.
nickel oxide
C.
cobalt oxide
D.
iron oxide
Answer & Explanation
Answer: Option C

16. 
 Glass is made of the mixture of
A.
quartz and mica
B.
sand and silicates
C.
salt and quartz
D.
sand and salt
Answer & Explanation
Answer: Option B
17. 
 The vast resources of unutilised natural gas can be used in the production of
A.
graphite
B.
Synthetic petroleum
C.
fertilisers
D.
carbide
Answer & Explanation
Answer: Option C
18. 
 Paper is manufactured by
A.
Wood and resin
B.
Wood, sodium and bleaching powder
C.
Wood, calcium, hydrogen sulphite and resin
D.
Wood and bleaching powder
Answer & Explanation
Answer: Option C
19. 
 Gypsum is added to cement clinker to
A.
increase the tensile strength of cement
B.
decrease the rate of setting of cement
C.
facilitate the formation of colloidal gel
D.
bind the particles of calcium silicate
Answer & Explanation
Answer: Option B
20. 
 Soap is a mixture of sodium or potassium salts of
A.
dicarboxylic acids
B.
monocarboxylic acids
C.
glycerol
D.
tricarboxylic acids
Answer & Explanation
Answer: Option B

21. 
 The type of glass used in making lenses and prisms is
A.
jena glass
B.
soft glass
C.
pyrex glass
D.
flint glass
Answer & Explanation
Answer: Option D
22. 
 Which one of the following is the petroleum wax?
A.
Paraffin wax
B.
Jonoba wax
C.
Carnauba wax
D.
Bees wax
Answer & Explanation
Answer: Option A

Explanation:
Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators. It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood. In wood and paper matches, it helps to ignite the matchstick by supplying an easily vaporized hydrocarbon fuel.

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Elements and Metals Science MCQS

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Nuclear Science MCQS

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                          Nuclear Science MCQS
1. 
 Which of the following is used as a moderator in nuclear reactor?
A.
Thorium
B.
Graphite
C.
Radium
D.
Ordinary water
Answer & Explanation
Answer: Option B

2. 
 Which among the following is a positively charged particle emitted by a radioactive element?
A.
Beta ray
B.
Alpha ray
C.
Cathode ray
D.
Gamma ray
Answer & Explanation
Answer: Option B
3. 
 Atoms are composed of
A.
electrons and protons
B.
electrons only
C.
protons only
D.
electrons and nuclei
Answer & Explanation
Answer: Option D
4. 
 In an atomic explosion, enormous energy is released which is due to
A.
conversion of chemical energy into heat energy
B.
conversion of mechanical energy into nuclear energy
C.
conversion of mass into energy
D.
conversion of neutrons into protons
Answer & Explanation
Answer: Option C
5. 
 Isotopes are separated by
A.
crystallisation
B.
sublimation
C.
distillation
D.
filtration
Answer & Explanation
Answer: Option C

6. 
 The wavelength of X-rays is of the order of
A.
10 micron
B.
1 angstrom
C.
1 cm
D.
1 m
Answer & Explanation
Answer: Option B
Explanation:
1 angstrom = 1.0 x 10-10 meters
7. 
 Mesons are found in
A.
Laser beam
B.
X-rays
C.
Gamma rays
D.
Cosmic rays
Answer & Explanation
Answer: Option D
8. 
 Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
A.
Thorium
B.
Radium
C.
Plutonium
D.
Radan
Answer & Explanation
Answer: Option A
9. 
 Which of the following shows the masses of the three elementary particles in decreasing order?
A.
Leptons, Baryons, Mesons
B.
Mesons, Baryons, Leptons
C.
Baryons, Mesons, Leptons
D.
Leptons, Mesons Baryons
Answer & Explanation
Answer: Option C
10. 
 What is the wavelength of visible spectrum?
A.
8500 - 9800 angstrom
B.
7800 - 8000 angstrom
C.
3900 - 7600 angstrom
D.
1300 - 3000 angstrom
Answer & Explanation
Answer: Option C

11. 
 Which of the following has a least penetrating power?
A.
All have same penetrating power
B.
Beta Particles
C.
Alpha particles
D.
Gamma rays
Answer & Explanation
Answer: Option C
12. 
 The isotope of uranium capable of sustaining chain reaction is
A.
U-235
B.
U-245
C.
U-239
D.
U-238
Answer & Explanation
Answer: Option A
13. 
 The age of most ancient geological formations is estimated by
A.
Ra - Si method
B.
Potassium - argon method
C.
C14 method
D.
Uranium - lead method
Answer & Explanation
Answer: Option D
14. 
 Who suggested that most of the mass of the atom is located in the nucleus?
A.
Thompson
B.
Bohr
C.
Rutherford
D.
Einstein
Answer & Explanation
Answer: Option C
15. 
 The dark lines in the solar spectrum are due to
A.
absorption of corresponding wavelengths by the outer layers of the sun
B.
destructive interference between waves of certain definite wavelengths
C.
absorption of corresponding wavelengths by the prism used in the photograph
D.
absence of corresponding wavelengths from the light emitted by the core of the sun
Answer & Explanation
Answer: Option A

16. 
 In an atomic nucleus, neutrons and protons are held together by
A.
gravitational forces
B.
exchange forces
C.
coulombic forces
D.
magnetic forces
Answer & Explanation
Answer: Option B
17. 
 'No two electrons in an atom can have the same set of four quantum numbers' is
A.
Newton's law
B.
Bohr's law
C.
Aufbau principle
D.
Pauli's exclusion principle
Answer & Explanation
Answer: Option D
18. 
 According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
A.
a molecule
B.
a cation
C.
an anion
D.
an atom
Answer & Explanation
Answer: Option A
19. 
 Atoms of an element differ from those of all other elements in
A.
atomic number and electronic configuration
B.
number of neutrons and number of valence electrons
C.
atomic number and number of valence electrons
D.
number of neutrons and electronic configuration
Answer & Explanation
Answer: Option A
20. 
 Nuclear fission is caused by the impact of
A.
neutron
B.
proton
C.
deuteron
D.
electron
Answer & Explanation
Answer: Option A

Which of the following rays are more penetrating?
A.
Beta rays
B.
Alpha rays
C.
Gamma rays
D.
X-rays
Answer & Explanation
Answer: Option C
22. 
 How many colours the sunlight spectrum has?
A.
Three
B.
Seven
C.
Four
D.
Five
Answer & Explanation
Answer: Option B

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