Question
Write four ways of water management.
✓
Answer
- Avoid bath under a running shower, instead use a mug.
- Get leaking pipelines repaired.
- Avoid shaving and brushing teeth with running tap water.
- Avoid overflowing of water in buckets.
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Match the words of Column $I$ with those given in Column $II:$
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Column I
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Column II
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$1.$
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Scouring
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$(a)$
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Yields silk fibres
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$2.$
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Mulberry leaves
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$(b)$
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Wool yielding animal
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$3.$
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Yak
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$(c)$
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Food of silk worm
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$4.$
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Cocoon
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$(d)$
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Reeling
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$(e)$
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Cleaning sheared skin
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What are the necessary conditions for photosynthesis and how were they tested?
Match the parts of the heart in column $I$ with the direction of flow of blood in column $II.$
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Column $I$
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Column $II$
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$(i)$
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Right ventricle
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$(a)$
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Pushes blood into the pulmonary artery.
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$(ii)$
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Pulmonary veins
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$(b)$
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Take deoxygenated blood from the heart to lungs.
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$(iii)$
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Left atrium
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$(c)$
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Receives blood from different parts of the body.
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$(iv)$
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Pulmonary arteries
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$(d)$
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Bring oxygenated blood from lungs to the heart.
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$(v)$
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Left ventricle
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$(e)$
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Pushes blood into the aorta.
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vi)$
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Right auricle
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$(f)$
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Receives deoxygenated blood from the pulmonary veins.
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Which type of change takes place in the following and state whether the energy is evolved or absorbed during the change? Burning of a candle, lightning of a bulb, preparation of food by green plants, volcanic eruption, evaporation of petrol, burning of $LPG.$
→Priya’s grandfather was taken to the hospital as he was unable to perform excretory processes. Priya heard a nurse talking to her father that her grandfather’s has kidney failure and needs to undergo dialysis. Priya later asked her father as to what is dialysis process and why does grandpa needs it. Her father smiles and tells her all the facts associated with this process.
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- Which is the major excretory organ in humans?
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Describe the process by which plants prepare their food using different raw materials.
What are the advantages and disadvantages of vegetative reproduction?
The question assesses the student's ability to identify and explain heat transfer process in real life situations.
(i) By what method of heat transfer does heat energy from the sun reach the earth?
(ii) Select the process of heat transfer which causes a breeze (wind) over land and sea.
(a) Conduction $\quad$ (b) Convection $\quad$ (c) Radiation
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(iv) Suggest two domestic insulation techniques that the houses build at coastal areas could have to maintain constant temperatures.
→(i) By what method of heat transfer does heat energy from the sun reach the earth?
(ii) Select the process of heat transfer which causes a breeze (wind) over land and sea.
(a) Conduction $\quad$ (b) Convection $\quad$ (c) Radiation
(iii) Explain in term of heat transfer, why houses at coastal area often have their windows facing the sea?
(iv) Suggest two domestic insulation techniques that the houses build at coastal areas could have to maintain constant temperatures.
A student performs an experiment where he uses a heating coil to heat the water as shown in the figure. The initial temperature of the water is measured as $10^{\circ} C$. After switching it ON for 5 min, the student records the temperature of the water as $18^{\circ} C$.
The water is allowed to return back to its initial temperature. The activity is then repeated with another heating coil having half the length of the original heating coil. He notices that after 5 min, the temperature of the water reads $14^{\circ} C$. Which statement can be concluded based on the activity?
(a) Reading on thermometer reduces with time.
(b) Temperature of water drops with every repetition.
(c) Length of the material affects the amount of heating.
(d) Temperature of the water increases after a certain period of time.
→The water is allowed to return back to its initial temperature. The activity is then repeated with another heating coil having half the length of the original heating coil. He notices that after 5 min, the temperature of the water reads $14^{\circ} C$. Which statement can be concluded based on the activity?
(a) Reading on thermometer reduces with time.
(b) Temperature of water drops with every repetition.
(c) Length of the material affects the amount of heating.
(d) Temperature of the water increases after a certain period of time.
The given data regarding the motion of two different objects $C$ and $D$ is in a tabular form. Check them carefully and state whether the motion of the objects is uniform or non-uniform.
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Time
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Distance travelled by C (in m)
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Distance travelled by D (in m)
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$9:30:00\ AM$
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$10$
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$12$
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$9:45:00 \ AM$
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$20$
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$19$
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$10:00:00\ AM$
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$30$
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$23$
|
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$10:15:00 \ AM$
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$40$
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$35$
|
|
$10:30:00\ AM$
|
$50$
|
$37$
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|
$10:45:00 \ AM$
|
$60$
|
$41$
|
|
$11:00:00 \ AM$
|
$70$
|
$44$
|