Wells are fed by (a) pond water (b) lake water (c) rain water (d) groundwater
(d) groundwater Explanation When it rains, the water fills up the lakes and ponds. Some water gets absorbed by the... View Article
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Clouds are (a) tiny drops of water floating in air (b) mixture of dust and water vapour (c) particles of water vapour (d) rain drops in air.
a) Tiny drops of water floating in the air. Explanation Clouds are an important part of the earth’s weather and climate.Clouds... View Article
Transpiration is a process in which plants (a) receive water from soil (b) absorb water vapour from air (c) prepare food from water (d) release water vapour
(d) release water vapour. Explanation During the process of transpiration, water molecules in the plant tissues are removed from the... View Article
In which of the following case evaporation of water will be slowest? (a) A tray of water kept in sunlight. (b) A kettle of water kept on a burner. (c) A glass of water kept in a room. (d) A bucket of water kept on rooftop.
c) Glass of water kept in a room. Explanation A glass of water kept in a room. Evaporation is directly... View Article
Water in our tap comes from a (a) river (b) lake (c) well (d) river, lake or well
(d) river, lake or well Explanation We get water from taps in our home. This tap water is drawn either... View Article
The quantity of water required to produce one page of your book is (a) one bucket (b) ten buckets (c) two glasses (d) few drops.
c) Two glasses Explanation Almost two glasses of water is required to make one sheet of paper. Uses of water... View Article
In which of the following activities will you use minimum amount of water? (a) Bathing (b) Brushing teeth (c) Washing clothes (d) Mopping a room
b) Brushing teeth Explanation Water is one of the necessities for every living being and we cannot imagine a life without... View Article
Which of the following activity does not involve use of water? (a) Washing clothes (b) Bathing (c) Cleaning utensils (d) Drying wet clothes
d) Drying wet clothes Explanation Water gets converted into vapour form in drying wet clothes.Whereas washing, bathing and cleaning utensils are... View Article
On a Sunday morning, Paheli’s friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden they also observed some flowering plants on the roadside. But to their surprise, they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?
Paheli and her friend observed plants will dull leaves and flowers because of the air quality present in the open... View Article
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature. (a) Why did the tiny bubbles appear? (b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
Paheli had boiled out the complete water that means all the air from the water escaped out, so on boiling... View Article
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere. (a) Oxygen (b) Nitrogen (c) Carbon dioxide
(a) If oxygen disappear from the atmosphere then— There will be no life on the earth. Burning will be not... View Article
Explain the following observations very briefly. (a) A firki does not rotate in a closed area. (b) The arrow of weathercock points towards a particular direction at a particular moment. (c) An empty glass, in fact, is not empty. (d) Breathing through the mouth may harm you.
(a) Firki rotates when the force is applied to the blades of the first. The force is applied on the... View Article
Garima observed that when she left her tightly capped bottle full of water in open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it happened?
Air dissolved in the water escapes in the form of tiny bubbles because the sun was giving heat energy to... View Article
A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements. [Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders] (a) The ______ makes the windmill rotate. (b) Air is a ______ of some gases. (c) A weathercock shows the in which the air is moving at that place. (d) Mountaineers carry oxygen ___ with them while climbing high mountains.
(a) Wind Wind can be described as the movement of air from the high-pressure area to the low-pressure area. There... View Article
Make sentences using the given set of words. (a) 99%, oxygen, nitrogen, air, together (b) Respiration, dissolved, animals, air, aquatic (c) Air, wind, motion, called
(a) Oxygen and Nitrogen together make 99% of air. Oxygen is one of the major components of air around us.... View Article
In a number of musical instruments, air plays an important role. Can you name such instruments?
Air plays an important role in a number of musical instruments such as trumpet, mouth organ, flute, etc. Explanation In... View Article
State whether the following statements are true or false. If false, correct them. (a) Plants consume oxygen for respiration. (b) Plants produce oxygen during the process of making their own food. (c) Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and aeroplanes. (d) Air does not occupy any space.
(a) True During respiration, in different plant parts, significantly less exchange of gas takes place. Hence, each part nourishes and... View Article
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain (a) water vapour (b) only oxygen gas (c) air (d) none of these.
C) Air Explanation On pouring water in the lump of soil, air is released in the form of bubbles. A... View Article
The components of air which are harmful to live beings are (a) nitrogen and carbon dioxide (b) dust and water vapour (c) dust and smoke (d) smoke and water vapour.
(c) dust and smoke Explanation The composition of air is not constant and changes from place to place. For example:... View Article
Which of the following components of air is present in the largest amount in the atmosphere? (a) Nitrogen (b) Oxygen (c) Water vapour (d) Carbon dioxide
a) Nitrogen Explanation The atmospheric air contains all the mentioned components nitrogen, oxygen, water vapour and carbon dioxide. Nitrogen is... View Article
