1.Which gas is filled in the balloon? (3)
(a) Hydrogen
(b) Organe
(c) Helium
(c) Oxygen
2. The main component of biogas is (1)
(a) Methane
(b) Ethane
(c) Propane
(d) Ammonia
3. What is laughing gas? (2)
(a) Ammonia
(b) Nitric oxide
(c) Carbon dioxide
(d) Acetylene
4.The instrument used to measure air pressure (2)
(a) Seismograph
(b) Barometer
(c) Altimeter
(d) Thermometer
5. Which of the following is the brightest planet? (2)
(a) Mercury
(b) Vesper
(c) Mars
(d) Uranus