Class 10 Cbse Science Sample Paper Term 1 Model 1

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Sample Question Paper
SCIENCE
Class – X
Term – I
Time: 3 hrs. MM: 90
GENERAL INSTRUCTIONS:
i) The question paper comprises of two sections, A and B, You are to attempt both the
sections.
ii) All questions are compulsory.
iii) There is no overall choice. However internal choice has been provided in all the five
questions of five marks category. Only one option in such questions is to be
attempted.
iv) All questions of section A and all questions of section B are to be attempted
separately.
v) Questions numbers 1 to 3 in section A are one mark questions. These are to be
answered in one word or one sentence.
vi) Question numbers 4 to 7 are two marks, to be answered in about 30 words each.
vii) Question numbers 8 to 19 are three mark questions, to be answered in about 50
words each.
viii) Questions numbers 20 to 24 are five mark questions, to be answered in about 70
words each.
ix) Question numbers 25 to 42 in section B are multiple choice questions based on
practical skills. Each question is a one ark question. You are to choose one most
appropriate response out of the four provided to you.

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SECTION - A
1. Why is the box of a solar cooker covered with a glass plate?
2. A few drops of sulphuric acid are added into water before electrolysis. Why?
3. What happens when ZnCO3 is heated in the absence of air? Give the relevant equation.
4. Write four characteristics used for selecting a suitable fuel.
5. Name the product obtained by recrystallisation of sodium carbon ate and write its chemical
formula.
6. State the function of the guard cells. What will happen to the guard cells and stomatal pore
when water flows to guard cells?
7. What are the products formed when magnesium metal reacts with water? Why do the
pieces of metal start floating during the reaction?
8. (a) Identify the substance reduced, oxidizing agent and reducing agent in the following
reaction: ZnO + C → Zn + CO
(b) Packets of potato chips are flushed with nitrogen gas, why?
9. What are the functions of
(a) Gibberellins
(b) Cytokinins
(c) Absorbic acid
10. (a) How is common salt prepared from sea water?
(b) What will be the appropriate pH of the aqueous solutions of the following salts:
(i) Sodium Chloride
(ii) Ammonium Chloride

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11. What is Bleaching powder chemically called? Give reaction involved in its preparation. Give
one of its uses.
12. (a) Which hormone is responsible for the changes noticed in males at puberty?
(b) Deficiency of which hormone leads to dwarfism.
(c) Name the hormone which is injected to a diabetic patient.
13. What is geotropism? Describe an experiment to demonstrate positive and negative
geotropism.
14. Write the chemical name and formula of washing soda. How is it prepared? Write balanced
chemical equation of the reaction.
15. (a) State Ohm’s law.
(b) Draw the circuit diagram of Ohm’s law.
(c) What is the nature of graph in term of relation between V and I.
16. Draw a neat labelled diagram of a biogas plant.
17. In a house, four 60W electric bulbs are lighted for 2 hours and two 100W bulbs are lighted
for 4 hours every day. Calculate the energy consumed in the house for 30 days.
18. A student performs an experiment to study the magnetic effect of current around a current
carrying straight conductor with the help of a magnetic compass. He reports that
(i) The degree of deflection of the magnetic compass increases when the compass
is moved away from the conductor.
(ii) The degree of deflection of the magnetic compass increases when the current
through the conductor is increased.

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Which of the above observation of the student appears to be wrong and why?
19. (a) State the function of electric fuse.
(b) An electric bulb is marked 60W. What does this mean?
How much energy does it consume if used for 1 hour?
20. (i) Given below are the steps for extraction of copper from its ore. Write the reaction
involved.
(a) Roasting of copper[I] sulphide
(b) Reduction of copper [I] oxide with copper [I] sulphide.
(c) Electrolytic refining
(iii) Draw a neat and well labelled diagram for electrolytic refining of copper.
21. (a) Draw a neat diagram of excretory system of human beings and label the following:
(i) Kidney
(ii) Ureter
(iii) Urinary bladder
(iv) Urethra
(b) How is urine produced?
(c) Name two excretory products other than O2 and CO2 in plants.
22. (a) State the reasons for the following:
(i) Metals are good conductor of heat.
(ii) Addition of some silver to pure gold for making ornaments.
(iii) Inability of non-metals for displacing hydrogen from dilute sulphuric acid.

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(b) Balance the following equations
(iv) CaO + H2O → Ca (OH)2
(v) NaOH + H2SO4 → Na2SO4 +H2O
23. (a) A coil of insulated copper wire is connected to a galvanometer. What will happen if a
bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Withdrawn from inside the coil?
(iii) Held stationary inside the coil?
(b) Name the above phenomenon and mention the name of the scientist who
discovered it. State the law that relates the direction of current in the coil with the
direction of motion of the magnet.
24. “Sunlight is necessary for photosynthesis”. Explain an experiment to prove it.
OR
(a) Draw the structure of a nephron and label on it the following parts:
(i) Glomerulus
(ii) Bowman’s capsule
(iii) Renal artery
(iv) Collecting duct
(b) What happens to glucose, amino acids, salts and water that enter the nephron along
with filtrate?

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SECTION –B
25. When sodium sulphate and barium chloride solution are mixed together, the colour of
precipitate formed is:
(a) Yellow
(b) Green
(c) White
(d) Red
26. Four students were three given colourless liquids A, B, C of water, lemon juice and a mixture
of water and lemon juice and a mixture of water and lemon juice respectively. After testing
these liquids with pH paper, following sequences in colour change of pH paper were
reported.
(i) Blue, red and green
(ii) Orange, green and green
(iii) Green, red and red
(iv) Red, red and green
27. When crystals of FeSO4 are strongly heated the residue obtained is
(a) Red in colour
(b) Blue in colour
(c) Green in colour
(d) Colourless
28. Which of the following does not secrete any hormone?
(a) Testis

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(b) Spleen
(c) Ovary
(d) Pancreas
29. On adding dilute hydrochloric acid to granulated zinc placed in a test tube, a student would
observe that:
(a) The surface of the metal turns shining.
(b) The reaction mixture turns milky.
(c) The reaction mixture gives odour of chlorine.
(d) A colourless and odourless gas evolves with bubbles.
30. Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed
that the blue colour of the solution has changed and a layer has deposited on iron filings.
Which one of the following set of colours correspond to the colour of the solution and the
colour of the coating respectively?
(a) Yellow and green
(b) Brown and blue
(c) Red and greenish blue
(d) Light green and reddish brown.
31. Absorption of light energy by mesophyll cells of leaf causes
(a) Oxidation of chlorophyll
(b) Excitation of chlorophyll
(c) Reduction of chlorophyll
(d) Evolution of O2

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32. To determine that light is essential for photosynthesis, following are the steps, but not in
sequence:
(i) Pluck the leaf and do the starches test.
(ii) Keep the selected plant in sunlight.
(iii) Destarch the plant for 48 – 72 hours.
(iv) Cover the leaf with black paper strip.
33. Which part of sunlight is used in making solar cell?
(a) Infrared radiation
(b) Ultraviolet radiation
(c) Visible radiation
(d) All of these
34. Before setting up an experiment to show that seeds release CO2 during respiration, the
seeds should be:
(a) Dried completely
(b) Boiled to make them soft
(c) Soaked in vinegar
(d) Kept moist till they germinate
35. Which one of the following reaction can be a non-redox reaction?
(a) Combination
(b) Decomposition
(c) Displacement
(d) Double displacement

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36. The correct set up of for studying the dependence of the current on the potential difference
across a resistor is
(a) A
(b) B
(c) C
(d) D
37. In the experiment to study the dependence of current on potential difference across a
resistor, a student obtained a graph as shown in the diagram. The value of resistor is:
(a) 0.1 Ω
(b) 1.0 Ω
(c) 10 Ω
(d) 100 Ω
38. While preparing a temporary stained mount of a leaf epidermal peel, the extra stain is
removed by:
(a) Washing with water
(b) Washing with calcium chloride
(c) Soaking with filter paper

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(d) Absorbing with cotton wool
39. After performing the experiment to show that germinating seeds give out carbon dioxide
during respiration, students drew the following labelled diagrams.
The correct labelled diagram is
(a) A
(b) B
(c) C
(d) D
40. Two students [A] and [B] connect their two given resistors R1 and R2 in the manners shown
below.
Student A connects the terminals marked b1 and c1 while student B connects the
terminals marked d2 and c2 in their respective circuits at the points marked X and Y.
Which one of the following is correct in relation to above arrangement?

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(a) Both the students will determine the equivalent resistance of the series combination of
the two resistors
(b) Both the students will determine the equivalent resistance of the parallel combination
of the two resistors
(c) Student A will determine the equivalent resistance of series combination while student
B will determine the equivalent resistance of parallel combination of the two resistors
(d) Student a will determine the equivalent resistance of the parallel combination while
student B will determine the equivalent resistance of the series of combination of the
two resistors.
41. You are given four voltmeters of given ranges. The correct choice of voltmeter for during
the experiment with a battery of 4.5 V is:
(a) Voltmeter with range of 0 – 1V
(b) Voltmeter with range of 0 – 3V
(c) Voltmeter with range of 0 – 4V
(d) Voltmeter with range of 0 – 5V
42. When an epidermal of a leaf is observed through a high powered microscope, it shows that
each stomata is surrounded by
(a) Many guard cells
(b) A pair of guard cells
(c) A single guard cell
(d) A pair of epidermal cells

Class 10 Cbse Science Sample Paper Term 1 Model 1

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Class 10 Cbse Science Sample Paper Term 1 Model 1