Class 10 Science Sample Paper 2

1. Science Science Class-10 Sample Paper Sample Paper- -2 2 Question 1. Write the molecular formula of the 2nd and the 3rd member of the homologous series whose first member is methane. 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. Complete the missing components/variables given as x and y in the following reactions. (a) ??(??3)2 (??) + 2??(??) → ???2(?) + 2???3(?) (b) ??(?) + 2????3(??) → ?? (??3)2(??) + ?(?) Question 4. In one method of rust prevention, the iron is not coated with anything. Name the method and define it. Question 5. An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens. Question 6. Explain the action of dilute hydrochloric acid on the following with chemical equations: (a) Magnesium ribbon

2. (b) Sodium hydroxide (c) Crushed egg shells Or Or Describe an activity to prove that all hydrogen containing compounds such as alcohols and glucose are not acids. Question 7. Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving (a) from left to right in a period, and (b) down a group? Give reason to justify your answer Question 8. Draw a diagram of human excretory system and label kidneys, ureters on it. Question 9. Explain the feedback mechanism to regulate the action of the hormones with the help of one suitable example. Question 10. How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism? Question 11. State the cause of dispersion of white light by a glass prism. How did Newton, using two identical glass prisms, show that white light is made of seven colours? Draw a ray diagram to show the path of a narrow beam of white light, through a combination of two identical prisms arranged together in inverted position with respect to each other, when it is allowed to fall obliquely on one of the faces of the first prism of the combination. Or Or (i) What will be the colour of Sun when it is observed from a place on the earth (a) early in the morning, (b) At the noon? State the reason for the change in colour observed. (ii) The sky appears dark instead of blue to an astronaut. State its reason.

3. Question 12. (a) Draw the circuit diagram consisting of a battery of two cells of 2 volts each, a 2.5 Ω resister, a 4 Ω resistor, a 6 Ω resistor and a plug key, all connected in series. (b) Redraw the above electrical circuit with an ammeter to measure the current through resistors and voltmeter to measure the potential difference across 6 Ω resistor. What would be the reading in the voltmeter and ammeter? Question 13. With the help of a diagram for the experimental setup describe an activity to show that a current carrying conductor placed in a uniform magnetic field experience a force. Question 14. Write two points of difference between renewable and non- renewable sources of energy. Give one example of each. 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 neighborhood, 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. State what happens when a concentrated solution of sodium chloride (brine) is electrolyzed? Name the process. Write the equation of the reaction involved. Write the names of products obtained. Mention one use of each product. Question 17. Why certain compounds are called hydrocarbons? Write the general formula for homologous series of Alkanes, 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.

4. Question 18. (a) Explain how the separation of oxygenated and deoxygenated blood is useful in humans? (b) Why is double circulation of blood necessary in humans? Question 19. What do you mean by heating effect of electric current? Explain the production of heat in a resistor by flow of electric current through it. Name two devices based on heating effect of current. 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. Or Or List four categories of contraceptive methods. State in brief two advantages of adopting such preventive methods. Question 21. Analyze the following observation table showing variation of image- distance (v) with object- distance (u) in case of a convex lens and answer the questions that follow without doing any calculations: S.No. S.No. 1 2 3 4 5 6 Object Object- - Distance u (cm) Distance u (cm) −100 −60 −40 −30 −25 −15 Image Image- - Distance v (cm) Distance v (cm) +25 +30 +40 +60 +100 +120 (a) What is the focal length of the convex lens? Give reason to justify your answer. (b) Write the serial number of the observations which is not correct. On what basis have you arrived at this conclusion?

5. (c) Select an appropriate scale and draw a ray diagram for the observation at S. No. 2. Also find the approximate value of magnification. SECTION SECTION- - B B Question 22. While demonstrating a reaction in laboratory, a teacher added small amount of sodium sulphate solution to barium chloride solution in a test tube. (a) Name the products obtained. Are the products soluble in each other? (b) Write the type of chemical reactions in this case. Question 23. A student takes about 4 mL of distilled water in each of four test tubes I, II, III and IV, and then dissolves an equal amount of four different salts namely NaCl in I, ????2 ?? ??,????2 in III and KCl in IV. He then adds 8 drops of the given soap solution to each test tube and shakes the contents of the test tube 10 times. In which test tubes will enough lather (foam) be formed? Question 24. After preparing a temporary mount of leaf peel, Harshit recorded his observations as: (a) In an epidermal peel we see multiple layer of cells. (b) Each guard cell has one chloroplast and many nuclei. Do you agree with Harshit's observations? Justify your answer. Question 25. Draw in sequence (showing the four stages), the process of binary fission in Amoeba. 26. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he gradually moves the flame towards the lens and each time focuses its image on the screen. (a) In which direction does he move the lens to focus the flame on the screen? (b) What happens to the size of the image of the flame formed on the screen?

6. (c) What difference is seen in the intensity (brightness) of the image of the flame on the screen? (d) What is seen on the screen when the flame is very close (at about 5 cm) to the lens? Question 27. In an experiment to study the dependence of current on potential difference across a resistor, a student obtained a graph as shown below: Calculate the value of resistance of the resistor.

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