Class 9 CBSE Science MCQ

 Question-1. The Carbon-di-oxide also known as CO2 can be easily liquefied and even solidified because of the _____ process:

• A. It has relatively more force of attraction than other presented gases in the air
• B. It has more intermolecular space
• C. It has weak forces of attraction
• D. It is present in atmosphere

Question-2. Select the following: Under which of the following conditions we can boil water easily at room temperature?

• A. At high pressure
• B. At atmospheric pressure
• C. At low pressure
• D. At very high pressure

Question-3. Bose-Einstein Condensate have

• A. Low kinetic energy
• B. Very low kinetic energy
• C. High kinetic energy
• D. Highest kinetic energy

Question-4. Which of the following option is not an endothermic process?

• A. Temperature
• B. Insoluble heavy impurities
• C. Fusion
• D. Vaporisation

Question-5. Which of the following is best or you can say more suitable for summer?

• A. Polyester
• B. Nylon
• C. Cotton
• D. Silk

Question-6. Vapours formed on sublimation of iodine solid are in which color?

• A. Colourless
• B. Purple or violet in color
• C. Orange
• D. Yellow

Question-7. As per the following the Kinetic energy of molecules is directly proportional to

• A. Pressure
• B. Atmospheric pressure
• C. Temperature
• D. None of them

Question-8. Select the following that does not affect rate of evaporation?

• A. Temperature.
• B. Surface area.
• C. Wind speed.
• D. Insoluble heavy impurities.

Question-9. Which of the below-provided statement is completely incorrect about plasma?

• A. It contains of super-energetic and super-excited particles.
• B. Fluorescent tube and neon sign bulbs comprise of plasma.
• C. The gas becomes ionised when electrical energy flows through it.
• D. The plasma lights with colour which does not depend upon the nature of gas.

Question-10. Select the following which has highest kinetic energy?

• A. Particles of water at 0 °C
• B. Particles of ice at 0 °C
• C. Particles of steam at 100 °C
• D. Particles of water at 100 °C