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How is the mode of action in beating of the heart different from reflex actions? Give four examples.
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Sep 23, 2022
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Haren
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class-10
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A compass needle is placed near a current carrying wire. State your observations for the following cases and give reasons for the same in each case
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Sep 23, 2022
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Rohit wants to have an erect image of an object using a converging mirror of focal length 40 cm.
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Sep 17, 2022
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A lens of focal length 5 cm is being used by Debashree in the laboratory as a magnifying glass. Her least distance of distinct vision is 25 cm.
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Sep 17, 2022
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Ravi kept a book at a distance of 10 cm from the eyes of his friend Hari. Hari is not able to read anything written in the book. Give reasons for this?
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Sep 17, 2022
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Haren
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305k
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class-10
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The above images are that of a specialized slide projector. Slides are small transparencies mounted in sturdy frames ideally suited to magnification and projection
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Sep 17, 2022
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class-10
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Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes.
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Sep 17, 2022
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In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.
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Sep 17, 2022
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Haren
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305k
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class-10
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What might be the reason for the varied observations of the two students?
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Sep 17, 2022
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class-10
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The diagram above is a schematic diagram of a household circuit. The house shown in the above diagram has 5 usable spaces where electrical connections are made.
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Sep 17, 2022
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305k
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class-10
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Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
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Sep 17, 2022
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class-10
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Why is it not possible to reconstruct the whole organism from a fragment in complex multicellular organisms?
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Sep 17, 2022
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Explain how the uterus and placenta provide necessary conditions for proper growth and development of the embryo after implantation?
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Sep 17, 2022
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Haren
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305k
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class-10
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How are variations useful for species if there is drastic alteration in the niches?
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Sep 17, 2022
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class-10
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Reshu by mistake forgot to label the two test tubes containing Ethanol and Ethanoic acid. Suggest an experiment to identify the substances correctly?
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Sep 17, 2022
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Haren
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305k
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class-10
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What is the role of concentrated Sulphuric acid when it is heated with Ethanol at 443 K. Give the reaction involved.
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Sep 17, 2022
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Haren
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class-10
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Shristi heated Ethanol with a compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet smelling compound B is formed.
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Sep 17, 2022
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Why is damage to the ozone layer a cause for concern? What are its causes and what steps are being taken to limit this damage?
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Sep 17, 2022
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Haren
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A student fixes a white sheet of paper on a drawing board. He places a bar magnet in the centre and sprinkles some iron filings uniformly around the bar magnet.
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Sep 17, 2022
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Science
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Haren
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305k
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class-10
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How is lymph an important fluid involved in transportation? If lymphatic vessels get blocked, how would it affect the human body? Elaborate.
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Sep 17, 2022
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Science
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Haren
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305k
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class-10
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