MCQs

Q321: When salt is added to the pure water, its boiling point?

• A) Increases
• B) Decreases
• C) Remains same

Q322: The pitch of a sound wave is related to/depends on its ______?

• A) Beats
• B) Frequency
• C) Amplitude

Q323: All of the following are bad conductors of heat except?

• A) Copper
• B) Wood
• C) Plastic

Q324: How can a bearing be removed from a shaft?

• A) By cooling
• B) By hammering
• C) By heating

Q325: What is the percentage of nitrogen gas in air?

• A) 98%
• B) 58%
• C) 78%

Q326: With the increase in temperature, heat will be?

• A) Increase
• B) Decrease
• C) Remain constant

Q327: The percentage of Oxygen in the air is _____?

• A) 20.94%
• B) 21.94%
• C) 22.94%

Q328: Which is a water purification technology that uses a semipermeable membrane to remove ions, molecules and larger particles from drinking water?

• A) Filtration
• B) Reverse Osmosis (RO)
• C) Sedimentation

Q329: The branch of chemistry which deals with the study of all elements and their compound except hydrocarbons is called?

• A) Organic chemistry
• B) Inorganic chemistry
• C) Physical chemistry

Q330: What is the factor effect of boiling water?

• A) Air pressure
• B) Temperature
• C) Pressure