General Science - Chemistry MCQ's

Question 121 :
Catalyst is a substance which

1. increases the rate of the reaction
2. decreases the rate of reaction
3. has no action on the rate of the reaction
4. None of these

Question 122 :
One of the following is used to dissolve noble metals. That is

1. Nitric acid
2. Hydrochloric acid
3. Sulphuric acid
4. Aqua ragla

Question 123 :
The electronic configuration of an atom having atomic number 20 is

1. 2 8 10
2. 2 6 8 4
3. 2 8 8 2
4. 2 10 8

Question 124 :
The acid used in lead storage cells is

1. phosphoric acid
2. hydrochloric acid
3. nitric acid
4. sulphuric acid

Question 125 :
Sea weeds are important source of

1. iron
2. chlorine
3. bromine
4. iodine

Question 126 :
The natural source of hydrocarbon is

1. Crude oil
2. Biomass
3. Coal
4. Carbohydrates

Question 127 :
Detergents clean surfaces on the principle of

1. viscosity
2. surface tension
3. elasticity
4. floatation

Question 128 :
In which of the following states maximum iron ore is found ?

1. FeC03
2. Fe203
3. Fe304
4. FeS2

Question 129 :
Steel contains

1. 12% carbon
2. 5-10% carbon
3. more than 10% carbon
4. no carbon

Question 130 :
The polymer used in making plastic crockery is

1. Decron
2. Nylon
3. Bakelite
4. Melamine

Question 131 :
The chief constituent of vinegar is

1. Formic acid
2. Acetic acid
3. Salycylic acid
4. Oxalic acid

Question 132 :
When formaldehyde and potassium hydroxide are heated we get

1. Acetylene
2. Methyl alcohol
3. Methane
4. Ethyl formate

Question 133 :
German silver used for making utensils is an alloy of

1. copper silver nickel
2. copper zinc nickel
3. copper zinc aluminium
4. copper nickel aluminium

Question 134 :
The amount of chlorine available in water after disinfection is: called as

1. free chlorine
2. residual chlorine
3. free available chlorine
4. combined available chlorine

Question 135 :
Which of the following is used in welding broken pieces of iron rails and machine parts?

1. Aluminium sulphate
2. Solder
3. Aluminium powder
4. None of the above

Question 136 :
The purity of gold is expressed in carats. The purest form of goldis

1. 24 carats
2. 6 carats
3. 916 carats
4. 22 carats

Question 137 :
Which among the following is a carbohydrate ?

1. Nylon
2. Cane sugar
3. Turpentine
4. Hydrogen peroxide

Question 138 :
Bauxite is an alloy of which of the following metals ?

1. Aluminium
2. Silver
3. Tin
4. Iron

Question 139 :
Name two elements that find wide application in transistor industry

1. Silicon and Germanium
2. Carbon and Platinum
3. Iridium and Germanium
4. Tungsten and Platinum

Question 140 :
What is the element required for solar energy conversion ?

1. Beryllium
2. Tantalum
3. Silicon
4. Ultra pure carbon

Question 141 :
When water itself combines chemically with some element or mineral it is called

1. Carbonation
2. Desilication
3. Hydration
4. Oxidation

Question 142 :
Commercially sodium bicarbonate is known as

1. Washing soda
2. Baking soda
3. Bleaching powder
4. Soda ash

Question 143 :
A metal is exposed to the atmosphere for sometime It becomes coated with green carbonate. The metal must be

1. silver
2. copper
3. aluminium
4. zinc

Question 144 :
Which one of the following contributes largely to thegreenhouse effect ?

1. Ozone
2. Carbon monoxide
3. Carbon dioxide
4. Water vapour

Question 145 :
Ozone layer is present in

1. Troposphere
2. Ionosphere
3. Stratosphere
4. Exosphere

Question 146 :
Which one of the following is known as the brown coal ?

1. Anthracite
2. Bituminous
3. Coke
4. Lignite

Question 147 :
The ratio of pure gold in 18 carat gold is

1. 60%
2. 75%
3. 80%
4. 90%

Question 148 :
Bone ash contains

1. Calcium sulphate
2. Phosphoric sulphate
3. Calcium phosphate
4. Calcium hypophosphate

Question 149 :
Which of the following type of coal has the lowest proportion of volatile matter ?

1. Lignite
2. Peat
3. Bituminous
4. Anthracite

Question 150 :
A powerful eye irritant present in smog is

1. nitric oxide
2. Sulphur dioxide
3. peroxyacetyl nitrate
4. carbon dioxide