General Science-82

1.      The bell metal is an alloy of:

a.     Nickel and copper

b.     Zinc and copper

c.     Tin and copper

d.     Tin and aluminum

2.     Parsec is a measure of:

a.     Brightness of heavenly body

b.     Astronomical distance

c.     Density of stars

d.     Orbital velocity of giant stars

3.     By fixation of nitrogen is meant:

a.     Manufacture of nitrogen

b.     Liquefaction of nitrogen

c.     Conversion of nitrogen into nitric acid

d.     Conversion of atmospheric nitrogen into Useful compounds

4.     Atoms of the same element, i. e., having the Same atomic number that differ in atomic
Weight, are called:

a.    Isotopes

b.     Isomers

c.     Isobars

d.     Isohytes

5.     The quantum number that tends to specify The orientation in space for an orbital is the:

a.     Principal quantum number

b.     Orbital quantum number

c.     Magnetic quantum number

d.     Spin quantum number

6.     Carbohydrates are the compounds of:

a.     Carbon and hydrogen

b.    Carbon, oxygen and hydrogen

c.     Carbon, oxygen, hydrogen and nitrogen

d.     Carbon, nitrogen and hydrogen

7.     The tides in the ocean are due to:

a.     Wind over the oceans

b.    Gravitational pull of the moon

c.     Rotation of the earth

d.     Revolution of the earth

8.     When water freezes its density:

a.     Increases

b.    Decreases

c.     remains constant

d.     Becomes zero

9.     A chemical reaction that takes place with the evolution of heat is called a/an:

a.     Reversible reaction

b.     Endothermic reaction

c.     Thermal reaction

d.     Exothermic reaction

10.  The manufacture of iron ore Involves the process of:

a.     Oxidation

b.    Reduction

c.     Fractional distillation

d.     Electrolysis

11.  A double convex air bubble in water would behave as a:

a.     Convergent lens

b.    Divergent lens

c.     Both as convergent and divergent lenses

d.     None of them

12.  Which of the following has the strongest bleaching property?

a.    Chlorine

b.     Fluorine

c.     Bromine

d.     Iodine

13.   The most abundant element in the earth’s crust is:

a.    O

b.     Al

c.     Si

d.     Fe

14.  Which of the following gases do not form part of the atmosphere?

a.     Nitrogen

b.    Chlorine

c.     Carbon dioxide

d.     Oxygen

15.  Nitric acid does not react with:

a.     Copper

b.    Gold

c.     Silver

d.     Zinc

16.  Oxygen is manufactured by the fractional evaporation of:

a.     Water

b.    Liquid air

c.     Hydrogen peroxide

d.     Liquid oxygen

17.  Sodium burns in air to give:

a.    Sodium peroxide

b.     Sodium hydroxide

c.     Sodium monoxide

d.     Sodium oxide and sodium nitride

18.  Argon gas was discovered by:

a.    William Ramsay

b.     Charles

c.     Cavendish

d.     John Davy

19.  Formaldehyde is the starting material for the manufacture of:

a.     D. D. T.

b.     Rayon

c.     Bakelite

d.     Caprolactam

20.  During burnings of fuels, carbon and hydrogen present in the fuels are:

a.    Converted into carbon dioxide and water vapour

b.     Released into the atmosphere

c.     Absorbed by the surroundings

d.     Converted into alkane

21.  Dry ice is:

a.     Ice which never melts

b.     A term used for insensitive persons

c.     Solid carbon dioxide

d.     Frozen heavy water

22.  The compound which can be used to prepare iodoform is:

a.     Accetic acid

b.     Methyl iodide

c.     Acetone

d.     Propionaldehyde

23.  The phenomenon of “metamerism” is shown by:

a.     Acetone and Propionaldehyde

b.    Methyl propylether and diethyl ether

c.     Ethyl alcohol and dimethyl ether

d.     Propionic acid and acetic acid

24.  If two liquids have widely different boiling points, they may be separated by:

a.     Steam distillation

b.     Decantation

c.     Evaporation

d.     Fractional distillation

25.  What is laughing gas?

a.     Carbon dioxide

b.     Sulphur dioxide

c.     Nitrous oxide

d.     Hydrogen peroxide