171 Q) "Consider the following substances
I. Toilet soap
II. Toothpaste
III. Vinegar
IV. Baking soda
Which of the substances given above is/are mixture in nature?"
(a) I, II, III and IV
(b) I, II and III
(c) I and III
(d) III and IV
172 Q) Gold is mainly extracted by
(a) carbon reduction
(b) self reduction
(c) electrolytic method
(d) Arndt forrest cyanide method
173 Q) "Consider the following statements
I.Cloud seeding is an attempt to change the amount of precipitation.
II.The most common chemicals used for cloud seeding include silver iodide, dry ice and liquid propane.
Which of the statements given above is/are correct?"
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
174 Q) "Consider the following statements
I. Generally, diesel engines operate well with a cetane number from 40 to 55.
II. Alkyl nitrates (principally 2-ethyl hexyl nitrate) and di-tert-butyl peroxide are used as additives to raise the cetane number.
Which of the statements given above is/are correct?"
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
175 Q) Which one of the following petroleum refinery products has the lowest boiling point?
(a) Kerosene
(b) Gasoline
(c) Diesel
(d) Lubricating oil
176 Q) Which one of the following is an element?
(a)Topaz
(b) Diamond
(c) Ruby
(d) Sapphire
177 Q) The bond which is present between water molecules is
(a) electrovalent bond
(b) covalent bond
(c)hydrogen bond
(d)van der Waals' bond
178 Q) Which one among the following agents is added to domestic LPG cylinder to help in the detection of gas leakage?
(a) Methano
(b)Ethanol
(c) Thioethanol
(d)Chloroform
179 Q) Which allotropy of carbon is in rigid three-demensional structure?
(a) Graphite
(b)Fullerene
(c) Diamond
(d)Carbon black
180 Q) Guncotton is used as a propellant or low-order explosive. Chemically the gun cotton is
(a)potassium hydroxide
(b)cellulose sulphate
(c)cellulose nitrate
(d)calcium phosphate
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