atmosphere, carbon dioxide, composition of air, oxygen, nitrogen, smoke, windmill
1. How does pollution lead to global warming?
2. How can change in composition of air lead to global warming?
- Name the various composition of air.
- Which of the following shows the direction of the wind: a) anemometer b) windmill c) windvane d) barometer
- Which of the constituents of air on increasing causes global warming: a) nitrogen b)oxygen c) inert gases d) carbon dioxide
- The percentage of water vapor present in air is called: a) density b) humidity c) mass d) solubility
- Breathing through mouth is not hygienic because: a) dust particles will enter our lungs b) we will inhale more carbon dioxide c) our throat will become sore d) we will easily catch cold
- The correct ascending order of gases as per their composition in air is: a) oxygen < carbon di oxide < nitrogen b) hydrogen < oxygen < nitrogen c) nitrogen < hydrogen < oxygen d) oxygen < carbon di oxide < hydrogen
- Which of the following is combustible: a) oxygen b) nitrogen c) water vapour d) carbon dioxide
- What is the role of fine hair present in our nostrils?
- Why is air called a mixture? Explain briefly.
- Which of the following processes need oxygen: a) combustion b) respiration c) oxidation d) all of the above
- Which of the statement is true regarding the earth’s atmosphere: a) it gets denser with an increase in the altitude b) it gets thinner with an increase in the altitude c) it remains the same d) contains no solid particles
- Which of the following plays a very important role in the oxygen cycle: a) birds b) animals c) plants d) soil
- The proportion of oxygen and carbon dioxide in the atmosphere is maintained by: a) plants b) animals c) machine d) both a and b
- Air is: a) homogenous b) heterogeneous c) compound d) alloy
- Why do mountaineers carry oxygen cylinder with them while climbing high mountains?
- How will you prove air supports burning?
- Why do we see earthworms only during rainy season outside the soil?
- How do we know there is air in soil? Explain with the experiment.
- In case of fire, one is advised to to wrap a woolen blanket around the object. Explain why.
- Why does a lump of cotton wool shrink when dipped in water?
- How do plants and animals help each other in exchange of gases in the atmosphere?
- Which of the following enables us to drink liquid through a straw: a) humidity b) temperature c) atmospheric pressure d) composition of air
- Why do you see air bubbles forming in tub of water when we tilt an empty bottle inside the tub filed wit water? Give reasons.
- How do we know air has oxygen present in it? Explain in detail.
- What will happen to the candle when the glass is put on top of it. Do the water level rise or not. Give reasons for your answer and explain with a diagram.
- Air is dissolved in water. How can we explain this statement?
- When water begins to boil, we see tiny bubbles forming in the water. What are these bubbles? Can we see these bubbles when this boiled water is kept in a air tight container and re heated? Give reasons for your answer.
- Read the two sentence given in the box: Statement1: The compressed air in a tyre exerts force large enough to lift a heavy car Statement 2: In a syringe, the plunger compressed the liquid a) both statement 1 and 2 are correct b) both statements 1 and2 are false c) statement 1 is correct but statement 2 is false d) statement 1 is false but statement 2 is correct
- Statement 1: Mountain climbers require to carry oxygen cylinders. Statement 2: Oxygen levels decrease as we go higher and pressure also increase. a) both statement 1 and 2 are correct b) both statements 1 and2 are false c) statement 1 is correct but statement 2 is false d) statement 1 is false but statement 2 is correct
- In this experiment the following conclusion was drawn: Statement1: Air has mass. Statement 2: Balloon with air has more mass than the balloon with no air a) both statement 1 and 2 are correct b) both statements 1 and2 are false c) statement 1 is correct but statement 2 is false d) statement 1 is false but statement 2 is correct