MCQs

Q31: The freezing point of water on a centigrade scale is?

• A) 0°C
• B) 1°C
• C) -1°C

Q32: How many bones in human body?

• A) 200
• B) 206
• C) 270

Q33: The change from liquid to solid, or the reverse of melting, is called?

• A) Melting
• B) Freezing
• C) Evaporation

Q34: The breathing centre of human body is?

• A) Lungs
• B) Ears
• C) Nose

Q35: The general formula for alkanes is _____?

• A) CnH2n
• B) CnH2n+1
• C) CnH2n+2

Q36: What is produced when fuel is burned?

• A) Carbon monoxide gas
• B) Methane gas
• C) Carbon dioxide gas

Q37: Which gas is used to extract energy from food in photosynthesis?

• A) O2 (Oxygen)
• B) CO2 (Carbon Dioxide)
• C) H2O (Water)

Q38: Photosynthesis is the chemical reaction that occurs in the leaves of plants. But it requires a special gas, abiotic component from the atmosphere. What is this substance?

• A) Nitrogen
• B) Water Vapor
• C) Carbon Dioxide

Q39: What is the S.I unit of temperature?

• A) Kelvin
• B) Centigrade
• C) Fahrenheit

Q40: The SI unit of electric current is _____?

• A) Ampere
• B) Volt
• C) Coloumb