Water: Class 6 Science Q&A · Page 2
53 free answers on Water (Science) for Class 6 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 6CBSE
How do wet clothes become dry?
Wet clothes become dry because of the process called evaporation. In this process, the water present in the clothes changes into water vapour and mixes with the air. Heat from the surroundings or sunlight provides energy to the water molecules, allowing them to escape into the air. The rate of evaporation increases when: The temperature is high (sunlight or warm air) The wind is blowing (moving air ca
- ScienceClass 6CBSE
A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
Some of the reason due to which shadow was not obtained can be The screen is far away from the The beam of light from the torch is falling parallel to the screen on the The torch is kept away from the
- ScienceClass 6CBSE
A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.
We can see the shadow of football lying on the ground because the ground acts as a screen for it. However, when the football is kicked high into the air it will be away from the ground, shadow disappears with height hence we cannot see the shadow of the football when it is in air.
- ScienceClass 6CBSE
Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?
Pinhole camera does not change the colour of the image. The colours of the shirts in the image will remain same as the colour of the shirt. But the image of the person will be inverted when seeing through a pinhole camera.
- ScienceClass 6CBSE
Three identical towels of red, blue and green colours are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?
Shadow is usually dark or black in colour. Hence, the colour of shadows of all the three towels will remain same as no light passes through them.
- ScienceClass 6CBSE
Is air around us always transparent? Discuss.
Yes, air around us is transparent which makes things visible to our eyes. When thick smoke/ thick clouds, etc. are present in the air it does not remain transparent it makes visibility difficult.
- ScienceClass 6CBSE
A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.
No, the colour of light will not affect the shadow because shadow is usually dark or black patch formed when an object obstructs the path of light and hence no light reaches in the shadow region.
- ScienceClass 6CBSE
You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.
Solution: A transparent glass sheet can be made into translucent glass sheet without breaking it by: Applying oil, grease, butter on it or pasting a butter paper on Rubbing the surface of the glass by any abrasive material like sandpaper on
- ScienceClass 6CBSE
On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?
No, a bird or an aeroplane flying high in the sky cannot cast its shadow on the ground even on a sunny day because they are flying at a higher altitude where the object cannot obtain its shadow. We can only see their shadow on the ground if they are flying very close to the ground.
- ScienceClass 6CBSE
Suggest a situation where we obtain more than one shadow of an object at a time.
Solution: At a time we can obtain more than one shadow of an object if light from more than one source falls on it. For example: In a cricket stadium, we can observe multiple shadows of players since light falls on them from different directions.
- ScienceClass 6CBSE
Correct the following statements. (i) The colour of the shadow of an object depends on its colour of the object. Transparent objects allow light to pass through them partially.
No, the colour of the object does not depend on the colour of the shadow since the shadow is usually dark in colour. Transparent objects allow most of the light to pass through Translucent objects allow light to pass through them partially.
- ScienceClass 6CBSE
Two students while sitting across a table looked down on to its top surface. They noticed that they could see their own and each other’s image. The table top is likely to be made of (a) Unpolished wood (b) Red stone (c) Glass sheet Wood top covered with cloth
Solution: (c): Glass sheet Only glass sheet can reflect light properly in order to form their images.
- ScienceClass 6CBSE
Which of the following can never form a circular shadow? (a) A ball (b) A flat disc (c) A shoe box An ice cream cone
Solution: (c): A shoe box A shoe box is either rectangle or square in shape.
- ScienceClass 6CBSE
Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observation about the shape and size of the shadow? (a) The shape of the shadow of the tree changes but the size remains the same. (b) The size of the shadow of the tree changes but the shape remains the same. (c) Both the size and shape of the shadow of the tree change. Neither the shape nor the size of the shadow changes.
Both the size and shape of the shadow of the tree change. Sun being the source of light, it changes its position at different points of time. So accordingly size and shape of the shadow of the tree change.
- ScienceClass 6CBSE
Which of the following is/are not always necessary to observe a shadow? (a) Sun (b) Screen (c) Source of light Opaque object
Solution: : Sun Sun is not always necessary to observe a shadow. Sun is a source of light. Any source of light can replace it like, torch etc.
- ScienceClass 6CBSE
Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. Explain how it happens?
Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean because the water that falls on the land as snow melts during summers and flows into the rivers and streams, from there it goes into the sea or oceans. Some of the water enters into ground and becomes available to us as groundwater. The groundwater is pumped out for domestic, irrigation and industrial use, which eventually goes into rivers and finally into the seas or oceans.
- ScienceClass 6CBSE
Fill in the blanks selecting words from, the following list. Snow, rain, clouds, vapour, evaporation, transpiration. Water, as goes into atmosphere by the processes of and and forms , which on condensation fall in the form of and .
Solution: vapour Evaporation Transpiration Clouds Snow Rain
- ScienceClass 6CBSE
Why is there a need for conserving water? Give two reasons.
There is a need for conserving water because: With rise in population, availability of water is The demand for water is increasing day to day. Hence we need to conserve water for future. The level of groundwater is decreasing drastically due to the change in climate which results in limited usage of This would lead to extreme water scarcity and hence we should conserve water for next generations.
- ScienceClass 6CBSE
Why do wet clothes placed on a clothes line get dry after some time? Explain.
Wet clothes placed on a clothes line get dry after some time because on exposing to sunlight, firstly water present in wet clothes gets converted into water vapour due to evaporation and as a result clothes get dry after some time.
- ScienceClass 6CBSE
How do the areas covered with concrete affect the availability of groundwater?
Areas covered with concrete affect the availability of groundwater because it reduces the entry of rainwater into the ground, which in turn reduces the availability of groundwater.