Dry ice is condensed form of

a) Sulfur tri-oxide

b) Carbon di-oxide

c) Highly cooled water

d) Oxygen

Which of the following is colorless?

a) Chlorine

b) Oxygen

c) Phosphorous

d) Sulfur

Hard water and soft water can be distinguished by using

a) Dilute acid

b) Ordinary soap

c) Detergent

d) Liquid soap

Which of the following fuels causes minimum environmental pollution?

a) Diesel

b) Kerosene

c) Hydrogen

d) Coal

Water cycle refers to

a) An integrated attempt to recycle water in relatively arid regions

b) Constant movement of water from ocean to land and back to ocean once again

c) Scientific management of water in areas excessively plagued with water logging

d) Water distribution in relatively dry areas

Ferrous sulfate is used in water treatment as an

a) Oxidizing agent

b) Reducing agent

c) Coagulant aid

d) Adsorbent

Hardness of water is commonly measured in terms of

a) Calcium carbonate equivalents

b) Calcium sulfate equivalents

c) Magnesium carbonate equivalents

d) Magnesium sulfate equivalents

Stainless steel is an alloy of

a) Chromium and carbon

b) Chromium, carbon and iron

c) Chromium and iron

d) Carbon and iron

For generation of biogas, the materials commonly used are

a) Animal wastes

b) Crop residue

c) Aquatic plants

d) Forrest residue

Raw materials used for the manufacture of glass are

a) Sand, soda, limestone

b) Sand, Charcoal, Soda

c) Limestone, charcoal, sulfur

d) Sand, sulfur, soda

Which of the following is used in welding broken pieces of iron rails and machine parts?

a) Aluminum sulfate

b) Solder

c) Aluminum powder

d) None of the above

Pure water is bad conductor of electricity because it is

a) Feebly ionized

b) Not volatile

c) A very good solvent

d) A non-polar solvent

The metals commonly used for electroplating are

a) Gold, sodium, chromium

b) Chromium, copper, nickel

c) Nickel, lead, chromium

d) Gold, sodium, potassium

Which of the following in automobile exhaust can cause cancer?

a) Oxides of nitrogen

b) Carbon monoxide

c) Lead

d) Polyclinic hydrocarbons

Bleaching powder is used in drinking water as an

a) Disinfectant

b) Antibiotic

c) Antiseptic

d) Coagulant

Substance that causes worst air pollution is

a) Sulfur di-oxide

b) Carbon di-oxide

c) Carbon mono-oxide

d) Smoke

Milk of magnesia is a suspension of

a) Magnesium carbonate

b) Magnesium hydroxide

c) Magnesium chloride

d) Magnesium sulfate

Chemical name of plaster of Paris is

a) Hydrated calcium carbonate

b) Calcium hydrate

c) Calcium sulfate hemihydrate

d) Calcium sulfate

Acidity of rain is measured by

a) Hygrometer

b) Ammeter

c) pH-meter

d) Barometer

Carbohydrates are compounds of

a) Carbon, Oxygen, Hydrogen

b) Carbon, Nitrogen, Hydrogen

c) Carbon and Nitrogen

d) Carbon and Hydrogen

Mass of 10 moles of water is

a) 90 g

b) 45 g

c) 18 g

d) 180 g

The high boiling point of H2O compared to H2S and HCl is due to

a) Dipole insulation

b) Van der Waal’s attraction

c) Polar covalent bonding

d) Hydrogen bonding

Which of the following determines the chemical properties of an element?

a) Number of electrons

b) Number of neutrons

c) Number of protons

d) All of above

Darkening property of photochromatic glass is due to the presence of

a) Silver bromide

b) Silver oxide

c) Silver nitrate

d) Silver chloride

Supersonic aircrafts discharge the following substance into the stratosphere:

a) NO2

b) SO2

c) CO2

d) H2

Chemical nature of laughing gas is

a) Nitric oxide

b) Hydrogen chloride

c) Nitrous oxide

d) Sulfur dioxide

The difference between isotopes of an element is due to the presence of a different number of

a) Protons

b) Neutrons

c) Electrons

d) Photons

The increasing abundance of greenhouse gases has led to the following effects except

a) Global Warming

b) Depletion of ozone layer in the atmosphere

c) Oxygen fertilization effect

d) Carbon dioxide fertilization effect

Ozone affects human health by causing severe pulmonary edema at a concentration of

a) 0.2 ppm

b) 0.3 ppm

c) 3.0 ppm

d) 9.0 ppm

Troposphere is the hottest part of the atmosphere because

a) Because it is closest to the sun

b) There are charged particles in it

c) It is heated by the earth’s surface

d) Heat is generated in it

Supersonic jets cause pollution by thinning of

a) O3 layer

b) O2 layer

c) SO2 layer

d) CO2 layer

Which type of reaction causes most harmful radiation?

a) Fusion

b) Fission

c) Chemical

d) Photo-chemical

Which type of glass is used for making glass reinforced plastic?

a) Pyrex glass

b) Flint glass

c) Quartz glass

d) Fiber glass

Glycol is added to aviation gasoline because it

a) Reduces evaporation of petrol

b) Increases efficiency of petrol

c) Prevents freezing of petrol

d) Reduces consumption of petrol

Which of the following minerals is found in Monazite sand?

a) Potassium

b) Uranium

c) Thorium

d) Sodium

Which of the following propellant could be used in rockets?

a) Hydrogen + Oxygen

b) Oxygen + Argon

c) Nitrogen + Oxygen

d) Hydrogen + Nitrogen

The addition of gypsum to Portland cement helps in

a) Increasing the strength of cement

b) Rapid setting of cement

c) Prevent rapid setting of cement

d) Reduction of concrete in cement

Iodoform is used as an

a) Antipyretic

b) Analgesic

c) Antiseptic

d) Anaesthetic

Glass is a

a) Superheated solid

b) Supercooled liquid

c) Supercooled gas

d) Superheated liquid

Beer-Lambert’s law is related to

a) Reflection

b) Refraction

c) Interference

d) Illumination

Which of the following is a constituent of tear gas?

a) Ethane

b) Ethanol

c) Ether

d) Chloropicrin

What is the chemical name of vinegar?

a) Citric acid

b) Acetic acid

c) Pyruvic acid

d) Malic acid