Sample Paper Class 10th Science:
Max. Marks: 80
(i) The question paper consists of two sections as A and B.
(ii) All questions are compulsory.
(iii) Questions from 1 to 4 in section A are 1 mark questions.
(iv) Questions from 5 to 12 are 2 marks each.
(v) Questions from 13 to 18 are 3 marks each.
(vi) Questions from 19 to 22 are 4 marks each.
(vii) Questions from 23 to 26 are 5 marks each.
(viii) Questions from 27 to 34 in section B are multiple choice questions 1 mark each.
Q.1 Give an example of an endothermic reaction.
Q.2 Give the electronic configuration of an element having atomic number 20.
Q.3 Three resistors of 20ohm, 40 ohm and 60 ohms are connected in parallel in an electric circuit. What is the current passing through resistor of 40 ohms?
Q.4 Give the chemical formula for Plaster of Paris.
Q.5 What do you mean by solenoid? Draw the pattern of magnetic field lines of a solenoid.
Q.6 List two differences between acquired and inherited traits.
Q.7 explain why:
(a) Danger sign is always in red colour.
(b) Metals are good conductor of electricity whereas non-metals are not.
Q.8 “Oxidation and reduction process takes place simultaneously”. Explain with example.
Q.9 what is the role of brain during reflex action?
Q.10 What is meant by accommodation of eye? How is it related to the focal length of the eye lens?
Q.11 How do guard cells regulate opening and closing of stomatal pores?
Q.12 How would you distinguish between ethanol and acetic acid in your laboratory? Give chemical equations shown by them.
Q.13 Two elements with symbol X(atomic no. 12) and symbol Y(atomic no. 13) are placed in third period of the modern periodic table:
(a) Which amongst the two has more metallic character?
(b) Calculate the valency of each element.
(c) “Element Y is smaller than element X in terms of atomic size”. Is the statement true,justify.
Q.14 Which compound is known as Plaster of Paris? How is it prepared?What happens when it is mixed with water ? Mention two applications of this property of plaster of paris.
Q.15 Define electric current and state its S.I. unit. Explain the ohm’s law and with its help explain 1 ohm resistance.
Q.16 Draw a neat diagram of structure of neuron and label the following: axon,cell body,dendrite.
Q.17 How is nuclear energy generated? State in brief process of utilizing this energy in generation of electricity. Also state the major hazards of nuclear energy.
Q.18 “Fossils are related to evolution” justify this statement. Give two methods by which the age of fossils can be estimated.
Q.19 A 4cm tall object is placed perpendicular to the principal axis of a concave lens of focal length 10cm. The distance of the object from the mirror is 15cm. Find the nature, position, size of image formed. Also draw the ray diagram.
Q.20 Complete the following reaction and name the main product formed in each case:
(i) CH3COOH + C2 H5 OH
(ii) C2 H5 OH
Q.21 List and describe in brief any three methods of birth control.
Q.22 what is saponification? Explain the cleansing action of soap.
Q.23 Describe in short an activity to (i) demonstrate the pattern of magnetic field lines around a straight current carrying conductor, and (ii) find the direction of magnetic field produced for a given direction of current in the conductor. Name and state the rule to find the direction of magnetic field associated with a current carrying conductor. Apply this rule to determine the direction of the magnetic field inside and outside a current carrying circular loop lying horizontally on a table. Assume that the current through the loop in anticlockwise.
Q.24 Name the type of mirror that should be used to obtain:
(a) a magnified and virtual image of an object.
(b) a diminished and virtual image of an object.
Draw labelled ray diagrams to show the formation of req. image in each of the above two cases.
Q.25 (a) Draw homologous series of organic compounds. Give two characterstics of the same.
(b) Name the compound formed on heating ethanol at 443K with excess of conc. H2 SO4.
(C)Describe a chemical test to distinguish b/w ehanol and ethanoic acid.
Q.26 (a) Give an example of bisexual flower and what is its female reproductive part known as?
(b) pollination may occur without fertilization but fertilization will not take place without pollination. Give reasons.
SECTION – B
Q.27 dilute acetic acid was added to the four test tubes containing chemicals:
Brisk effervence was observed in test tubes
(A) A and B
(B) B and C
(C) A and D
(D) D and C
Q.28 On putting a drop of a liquid on a pH paper a student observes a small circular patch of blue colour on the pH paper. The liquid is most probably.
Q.29 A student takes some zinc granules in a test tube and adds dil. HCl to it. He would observe that the colour of the zinc granules changes to :
Q.30 Iron filings were added to an aqueous solution of copper sulphate. After sometime on observation it was found that the colour of the solution has changed from
(a) blue to pale green.
(b) blue to colourless.
(c) blue to dark green.
(d) blue to reddish brown.
Q.31 What did you observe when you mixed aqueous barium chloride solution with aqueous
sodium sulphate solution in a test tube ?
(a)A pungent smelling gas is evolved.
(b)The colour of the solution turns blue black.
(c)A white precipitate is formed immediatly.
(d)No change in colour even after shaking the mixture well.
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