CBSE Class 10 Science Question Paper 2017 (Outside Delhi) with Solutions

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CBSE Class 10 Science Board Question Paper 2017 (Outside Delhi) with Solutions

Time allowed: 3 hours
Maximum marks: 80

General Instructions

• The Question Paper comprises of two sections, A and B. You are to attempt both the sections.
• All questions are compulsory.
• All questions of Section A and all questions of Section B are to be attempted separately.
• Question numbers 1 to 2 in Section A are one mark questions. These are to be answered in one word or in one sentence.
• Question numbers 3 to 5 in Section A are two marks questions. These are to be answered in about 30 words each.
• Question numbers 6 to 15 in Section A are three marks questions. These are to be answered in about 50 words each.
• Question numbers 16 to 21 in Section A are five marks questions. These are to be answered in about 70 words each.
• Question numbers 22 to 27 in Section B are questions based on practical skills and are two marks questions.

Section – A

Question 1.
How is the concentration of hydronium (H ₃ O ⁺ ) ions affected when a solution of an acid is diluted?

Question 2.
In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?
Plants → Deer → Lion

Question 3.
State two advantages of conserving: (i) forests and (ii) wild life.

Question 4.
State two ways for preventing rusting of iron articles.

Question 5.
List the properties of magnetic lines of force.

Question 6.
Differentiate between metals and non-metals on the basis of their chemical properties.

Question 7.
Explain the nutrition process in Amoeba.
Or
Draw a labelled diagram of human heart.

Question 8.
What is reflex arc? Draw a labelled diagram to show reflex arc on touching a very hot object.

Question 9.
Show how you would connect three resistors, each of 6 Ω, so that the combination has a resistance of – (a) 9 Ω and (b) 4 Ω.

Question 10.
Draw a sketch of the pattern of field lines due to a:
(a) current flowing into a circular coil,
(b) solenoid carrying current.

Question 11.
Write the structural formula of ethanol. What happens when it is heated with excess of cone. H ₂ SO ₄ acid at 443K? Write the chemical equation for the reaction, stating the role of cone. H ₂ SO ₄ acid in this reaction.
OR
Distinguish between esterification and saponification reactions with the help of chemical equations for each. State one use of each:
(i) esters and
(ii) saponification process.

Question 12.
How would pH value of solution change on addition of –
(i) water in a basic solution,
(ii) on addition of some more quantity of that base in the solution. Whether H ⁺ ions concentration will increase or decrease in both of these cases?

Question 13.
List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

Question 14.
If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system?

Question 15.
(a) Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, “How to save water, the vital natural resource”. Write any two ways that you will suggest to bring awareness in your neighbourhood, on ‘how to save water’.
(b) Name and explain any one way by which the underground water table does not go down further.

Question 16.
(a) What is the importance of pH in everyday life?
(b) How are sodium hydroxide and Cl ₂ (Chlorine) gas produced from common salt. What is this process called?

Question 17.
(a) Draw the structure of Neuron and explain its function.
(b) How does Phototropism occur in plants?

Question 18.
(a) If three resistors are connected in parallel combination, then deduce the formula to calculate their resultant resistance. Also draw the circuit diagram for the same.
(b) Give reason for the following:
(i) Electric bulbs are usually filled with chemical inactive gases like nitrogen and argon.
(ii) Copper and aluminium wires are mostly used for electricity transmission.

Question 19.
Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkenes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.

Question 20.
(a) Write the functions of each of the following parts in a human female reproductive system:
(i) Ovary
(ii) Uterus
(iii) Fallopian tube
(b) Write the structure and functions of placenta in a human female.

Question 21.
(a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why?
(b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm.
OR
(a) A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain
(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.
(ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens.
(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention.

Section – B

Question 22.
(a) What is least count of voltmeter?
(b) In a voltmeter there are 20 divisions between the ‘0’ mark and 0.5 V mark. Calculate its least count.

Question 23.
(a) How is pH paper used to find the pH of a solution?
(b) The pH value of water is 7. What will be the pH value of
(i) aqueous solution of sodium hydroxide and
(ii) dil. HCl

Question 24.
What are the precautions taken to prepare a temporary mount of a leaf peel to show its stomata?

Question 25.
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/ alkaline) of the reaction mixture of saponification reaction.

Question 26.
Draw in sequence (showing the four stages), the process of binary fission in Amoeba.

Question 27.
How will you find the focal length of a concave mirror in the lab? Write the stepwise sequence of events you will do in the lab.