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Clever Monkey`s CBSE X SCIENCE QUESTION 2-01
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Alloys are used in electrical heating devices rather than pure metals. Give one reason.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-02
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During summer season, a milkman usually adds a very small amount of baking soda to fresh milk. Give one reason.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-03
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Why potato chips manufacturers fill the packet of chips with nitrogen gas?
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-04
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In a household electric circuit different appliances are connected in parallel to one another. Give two reasons.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-05
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An electrician puts a fuse of rating 5A in that part of domestic electrical circuit in which an electrical heater of rating 1.5kW, 220V is operating.
What is likely to happen in this case and why? What change, if any, needs to be made?
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-06
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An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2. This compound reacts with ethanol to form a sweet smelling compound ‘B.
(i) Identify the compound ‘A’
(ii) Write the chemical equation for its reaction with ethanol to form compound ‘B’.
(iii) How can we get compound ‘A’ back from ‘B’?
(iv) Name the process and write corresponding chemical equation.
(v) Which gas is produced when compound ‘A’ reacts with washing soda?
write the chemical equation.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-07
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(a) Why does carbon form largest number of compounds?
(b) Why are some of these called saturated and other unsaturated compounds?
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-08
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State which of the following chemical reactions will take place or not, giving suitable reason for each.
Zn (s) + Cu SO4 (aq) ----> Zn SO4 (aq) + Cu (s)
Fe (s) + Zn SO4 (aq) ----> Fe SO4 (aq) + Zn (s)
Zn (s) + Fe SO4 (aq) ----> Zn SO4 (aq) + Fe (s)
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-09
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Give reasons for the following:
(i) The sky appears to be blue during day time to a person on earth.
(ii) The sky near the horizon appears to have a reddish heu at the time of sunset and
sunrise.
(iii) The sky appears dark instead of blue to an astronaut.
(iv) The stars appears to twinkle.
(v) The planets do not twinkle.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-10
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Draw ray diagrams to show the formation of a three times magnified
(i) real image
(ii)virtual image of an object kept in front of a converging lens. Mark the positions of object, F,
2F, O and position of image clearly in the diagram.
An object of size 5 cm is kept at a distance of 25cm from the optical centre of a converging lens of focal length 10cm.
Calculate the distance of the image from the lens and size of the image.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-11
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You are given the following materials:
(i) Iron nails
(ii) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quick Lime
Identify the type of chemical reaction taking place when.
(a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed.
(b) On heating copper powder in air in a China dish, the surface of copper powder turns black.
(c) On heating green coloured ferrous sulphate crystals, reddish brown solid is left and smell of a gas having odour of burning sulphur is experienced.
(d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.
(e) Quick lime reacts vigorously with water releasing a large amount of heat.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-12
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(a) Why is Plaster of Paris written as CaSo4 • ½ H2O? How is it possible to have half a water molecule attached to CaSO4?
(b) Why is Sodium Hydrogen Carbonate an essential ingradiant in antacids.?
(c) When electricity is passed through an acquous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali?
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-13
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Why does a current carrying conductor kept in a magnetic field experience force? On what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-14
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Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from
(i) left to right in a period.
(ii) from top to bottom in a group.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-15
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A student dropped few pieces of marble in dilute Hydrochloric acid contained in a test tube. The envolved gas was passed through lime water. What change would be observed in lime water?
Write balanced chemical equations for both the changes observed.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-16
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A person is able to see objects clearly only when these are lying at distances between 50cm and 300cm from his eye.
a) What kind of defects of vision he is suffering from?
b) What kind of lenses will be required to increase his range of vision from 25cm to infinity?
Explain briefly.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-17
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What is the meaning of the term ‘frequency’ of an alternating current? What is its value in India?
Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy?
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-20
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Metals generally occur in solid state. Name and write symbol of a metal that exists in
liquid state at room temperature.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-21
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A household uses the following electric appliances :
(i) Refrigerator of rating 400W for ten hours each day.
(ii) Two electric fans of rating 80W each for twelve hours each day..
(iii) Six electric tubes of rating 18W each for 6 hours each day..
Calculate the electricity bill of the household for the month of June if the cost per unit of
electric energy is Rs. 3.00.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-22
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Sketch magnetic field lines arround a current carrying straight conductor
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-23
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You are give three resistors of 10 Ω, 10 Ω and 20 Ω, a battery of emf 2.5V, a key, an ammeter and a voltmeter.
Draw a circuit diagram showing the correct connections of all given components such that the voltmeter gives a reading of 2.0V.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-24
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Identify the substance oxidised and reduced in the chemical reaction :
Mn O2 + 4 HCl ——> Mn Cl2 + Cl2 + 2H2O
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-25
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Dry Hydrogen Chloride gas does not turn blue litmus red whereas Hydrochloric acid does. Give one reason.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-26
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Draw the pattern of magnetic field lines of a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate?
Write one application of magnetic field
of current carrying solenoid.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-27
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A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins.
Which chemical phenomenon is responsible for these coatings?
Write the chemical name of black and green coatings.
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Clever Monkey`s CBSE X SCIENCE QUESTION 2-28
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Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets?
What should we do to prevent it?
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The CBSE questions are selected in such a way that if they are able to attend these questions, they will be confident of understanding the concepts. This site is purely an educational portal and here i am keeping CBSE sample papers and CBSE questions bank.CBSE Stands for Central Board of Secondary Education,
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