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Questions
41 The function of heavy water in a nuclear reactor is to:
A cool down the reactor
B stop the nuclear reaction
C slow down the speed of neutrons
D increase the speed of neutrons

Answer: Option [C]
42 Which one of the following non-metals is not a poor conductor of electricity ?
A Selenium
B Bromine
C Sulphur
D Phosphorus

Answer: Option [A]
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43 Photochemical smog is a resultant of the reaction among
A CO, CO2 and NO2 at low temperature
B CO, O2 and peroxyacetyl nitrate in the presence of sunlight
C High concentration of NO2, O3 and CO in the evening
D NO2, O3 and peroxyacetyl nitrate in the presence of sunlight

Answer: Option [D]
44 The water pollution in river is measured by the dissolved amount of
A Oxygen
B Nitrogen
C Ozone
D Chlorine

Answer: Option [A]
45 With reference to the usefulness of the by-products of sugar industry, which of the following is/are correct ?
I. Bagasse can be used as biomass fuel for the generation of energy.
II. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.
III. Molasses can be used for the production of ethanol.

Select correct answer using the codes given below.

A I only
B II and III only
C I and III only
D I, II and III

Answer: Option [C]
46 The alpha particle carries two positive charge. Its mass is very nearly equal to that of
A two protons
B an atom of helium
C sum of masses of two positrons and two neutrons
D two positrons as each positron carries a single positive charge

Answer: Option [B]
47 Consider the following statements: Hard water is not suitable for
I. drinking
II. washing clothes with soap
III. used in boilers
IV. irrigating crops

Which of these statements are correct ?

A I and III
B II and III
C I, II and IV
D I,II, III and IV

Answer: Option [D]
48 Which one of the following types of glass can cut off ultraviolet rays ?
A Crookes glass
B Jena glass
C Pyrex glass
D Soda glass

Answer: Option [A]
49 Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substance, are used
I. in the production of plastic foams
II. in the production of tubeless tyres
III. in cleaning certain electronic components
IV. as pressurizing agents in aerosol cans

Which of the statements given above is/are correct ?

A I, II and III only
B IV only
C I, III and IV
D I, II, III and IV

Answer: Option [C]
50 Which one of the following materials is very hard and ductile ?
A Tungsten
B Nichrome
C Cast iron
D Carborundum

Answer: Option [B]

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