121. Fabric made from_________ does not get wrinkled easily.

1. Cotton
2. Flax
3. Silk
4. Polyester

Option “D” is correct
Fabric made from Polyester does not get wrinkled easily.
122. What is formed when Carbon Dioxide is passed through Lime Water?

1. Copper Sulphate
2. Calcium Carbonate
3. Magnesium Oxide
4. Baking Soda

Option “B” is correct
Calcium Carbonate is formed when CO2 is passed through lime water.
123. All isotopes of the same element have _________.

1. different atomic numbers and different atomic mass
2. different atomic numbers and the same atomic mass
3. the same atomic number but different atomic masses
4. the same atomic number and the atomic mass

Option “C” is correct
All isotopes of the same element have the same atomic number but different atomic masses.
124. Nitric acid does not react with –

1. Gold
2. Copper
3. Zinc
4. Iron

Option “A” is correct
Some precious metals such as pure gold and platinum do not react with nitric acid. Pure gold does react with aqua regia a mixture of concentrated nitric acid and hydrochloric acid.
125. In a car battery, electrolyte substance used is-

1. Hydrochloric acid
2. Sulphuric acid
3. Nitric acid
4. Distilled water

Option “B” is correct
Electrolyte substance used in a car battery is Sulphuric acid (H_2 SO_4 ). It is a strong acid.
126. The average salinity of sea water is

1. 3%
2. 3.5%
3. 2.5%
4. 2%

Option “B” is correct
On average, seawater in the world’s oceans has a salinity of approximately 3.5%, or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it.
127. Because of impurities the boiling point of a liquid-

1. Increases
2. Decreases
3. Remains constant
4. They are not related

Option “A” is correct
The boiling point of a liquid is the temperature at which its vapour pressure is equal to the pressure of the gas above it. Generally impurities increases the boiling point of liquid.
128. Change of water into the vapour is called-

1. Natural
2. Physical
3. Chemical
4. Biological

Option “B” is correct
Change of water into the vapour is called a physical change.
129. Which one of the following is the hardest metal?

1. Gold
2. Iron
3. Platinum
4. Silver

Option “C” is correct
Among non-metals, diamond is the hardest whereas, among the metals, platinum is the hardest.
130. These days yellow lamps are frequently used as street light. Which one of the following us used in these lamps:

1. Sodium
2. Neon
3. Hydrogen
4. Nitrogen

Option “A” is correct
There are 2 types of street light bulbs are used by municipalities. They are sodium vapor and mercury vapor bulbs. The mercury vapor bulbs are usually a white ambient light and sodium on orange/yellow light.
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176 thoughts on “Chemistry”

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