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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.

ScienceClass 6CBSE

Water kept in sunlight gets heat from sun and is evaporated. But how does water kept under the shade of a tree also get evaporated? Explain

Water gets evaporated when kept under the shade of a tree during daytime due to the air around the tree also gets heated up from the presence of sunlight so water gets evaporated from the heated air.

ScienceClass 6CBSE

Write any two activities which require more than a bucket of water.

The two activities which require more than a bucket of water are : For irrigation purpose we require more For washing large number of

ScienceClass 6CBSE

Write any two activities which require less than one bucket of water.

The two activities which require less than one bucket of water are: For brushing For washing

ScienceClass 6CBSE

Catch water where it falls” is the basic idea behind (a) recycling of water (b) making dams to store water (c) rainwater harvesting condensation of water vapour.

(c): rainwater harvesting Rainwater harvesting is a method used to collect rainwater. By storing the water, we can increase the availability of water which is collected and stored for later use.

ScienceClass 6CBSE

1. Floods causes extensive damage to (a) crops (b) property and human life (c) domestic animals all of the above

Solution: (d): all of the above Due to heavy rains, water level rises in rivers, lakes and ponds. This water then spreads over large area causing floods. In turn crop fields, forests, villages and cities get submerged under water. Hence, flood causes extensive damage to crops, domestic animals, property and human life.

ScienceClass 6CBSE

Wells are fed by (a) pond water (b) lake water (c) rain water groundwater

(d): groundwater Lakes, ponds, rivers and other water bodies are filled up by rainwater. Some of the rainwater is evaporated back to air. The rest, soil absorbs the water into the ground and becomes available as groundwater. Hence, wells are fed by this ground water.

ScienceClass 6CBSE

1. 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.

Solution: : tiny drops of water floating in air Water vapour present in air condenses to form tiny droplets of water floating in air which appear to us as clouds. Later these tiny water droplets are formed into larger sized water drops and then get converted to rainfall.

ScienceClass 6CBSE

Transpiration is a process in which plants (a) receive water from soil (b) absorb water vapour from air (c) prepare food from water release water vapour

Solution: (d): release water vapour Transpiration is a process when the water is lost in the form of vapour which when parts of a plant (mainly leaves) are exposed is termed as transpiration. The loss of water due to transpiration is quite high.

ScienceClass 6CBSE

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): A glass of water kept in a room. Evaporation is directly proportional to temperature when temperature increases, evaporation also increases. Temperature in the room will be lower as compared to the temperatures of sunlight, burner and rooftop. So, a glass of water kept in a room has slowest water evaporation.

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