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Clever Monkey`s CBSE X SCIENCE QUESTION 3-1
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What are metalloids?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-2
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Tap water conducts electricity whereas distilled water does not. Why?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-3
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Give the names of the following functional groups:
a. –OH
b. –COOH
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-4
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Two thin lenses of power +5.0 Dand -7.5 D are kept in contact with each other. Find the power and focal length of this lens combination.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-5
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An electic iron has a rating of 750 W, 220 V. Calculate
a. Current passing through it
b. Its resistance, when in use.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--6
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What is the constituents of bronze?
Write its two main uses. Name the common constituent of brass and bronze.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-7
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Give reasons for the following:
a. Oxidation of ethanol with CrO3 produces ethanal while ethanol when oxidized with alkaline KMnO4 produces ethanoic acid.
b. Alcohol supplied for industrial purposes is mixed with copper sulphate.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-8
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What is the focal length of a plane mirror?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-9
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How will you use a solenoid to magnetise a steel bar?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-10
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What is the S.I. unit of electric potential?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-11
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Describe the construction and working of the human eye with the help of a labelled diagram.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-12
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Explain with the help of a labeled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-13
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a. Write the common name of ethanol
b. Name the substances in which ethanol is an important constituent
c. What happens when ethanol is heated in 443K with excess of concentrated sulphuric acid.
d. What happens when sodium reacts with ethanol?
e. Write two uses of ethanol.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-14
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a.. Write the formula for the given compounds and name the functional groups present in each of them:
i. Ethanoic acid
ii. Propanone
iii. Nitromethane
b. Describe with chemical equations how ethanoic acid may be obtained from ethanol and methanol
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--15
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a. What is meant by ‘Electric Resistance’ of a conductor?
b A wire of length L and resistance R is stretched so that its length is doubled and the area of cross-section is halved. How will its:
i. resistance change?
ii. resistivity change?
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-16
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Draw the pattern of lines of force due to magnetic field associated with a current carrying circular coil. State how the magnetic field produces depends on
a. The current passing through the conductor
b. The number of turns of wire in the coil
c. The radius of the coil.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-17
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Name the raw materials that are required for the manufacture of washing soda by Salvay process. Describe the chemical reactions involved in the process.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-18
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What are double displacement reaction? Give an example.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-19
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Draw the internal structure of the heart and explain how blood flows through the heart.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-20
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Draw the structure of a neuron and explain its function.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-21
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Differentiate between ‘self-pollination’ and ‘cross pollination’. Describe ‘double fertilization’ in plants.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3-22
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Suggest three ways to maintain a balance between environment and development to survive.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--23
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Differentiate between renewable and non-renewable sources of energy. Give two examples for each.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--24
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What is a nuclear chain reaction? Give an example to illustrate it.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--25
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Show a diagram to show the structure of a flower
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--26
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Differentiate between homologous and analogous organs. Give one example of each.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--27
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Describe the mechanism of blood clotting
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--28
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Name any two non-biodegradable wastes.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--29
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List two functions performed by ovaries in a human female.
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Clever Monkey`s CBSE X SCIENCE QUESTION 3--30
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Name the two stages of photosynthesis.
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