Please refer to Class 10 Science Sample Paper Set H below provided with solutions. All Class 10 Science Sample Paper have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS. All questions have been provided with solutions.
Class 10 Science Sample Paper Set H
Time: 3 Hours Maximum Marks: 80
General Instructions:
(i) The question paper comprises four sections A, B, C and D. There are 36 questions in the question papers. All questions are compulsory.
(ii) Section–A – question no. 1 to 20 – all questions and parts thereof are of one mark each. These questions contain multiple choice questions (MCQs), very short answer questions and assertion – reason type questions. Answers to these should be given in one word or one sentence.
(iii) Section–B – question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answers to these questions should in the range of 30 to 50 words.
(iv) Section–C – question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answers to these questions should in the range of 50 to 80 words.
(v) Section–D – question no. – 34 to 36 are long answer type questions carrying 5 marks each. Answer to these questions should be in the range of 80 to 120 words.
(vi) There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
(vii) Wherever necessary, neat and properly labeled diagrams should be drawn
SECTION-A
Question 1.Translate the following statements into chemical equations and then balance them: (1 Marks)
Calcium hydroxide reacts with nitric acid to give calcium nitrate and water.
OR
Methane burns in oxygen to form carbon dioxide and water. Write a balanced equation for the reaction.
Answer. Ca(OH)2 + 2HNO3 —– Ca(NO3)2 + 2H2O .
OR
Methane burns in oxygen to form carbon dioxide and water.
CH4 (g) + 2O2 (g) ———– CO2 (g) + 2H2O.
Question 2. Why do substances burn with or without flame? (1 Marks)
Answer. If the combustible substance is volatile in nature then it produces flame e.g. Petrol ,kerosene. If they are non-volatile then they do not produce flame e.g.coal.
Question 3. Why are mineral acids stronger acids than carboxylic acids? (1 Marks)
Answer. Because mineral acids are completely ionized whereas carboxylic acids are partially ionized.
Question 4. Why are danger light signals red in colour? (1 Marks)
Answer. As red light is scattered the least and it covers longer distances.
Question 5. Name a mirror that can give an erect and enlarged image of an object. (1 Marks)
Answer. Concave mirror.
Question 6. Give one use of bleaching powder. (1 Marks)
OR
What is pH of tomato juice.
Answer. (i) It is used for bleaching cotton and linen.
(ii) Used in textile industry.
OR
4.1-4.35.
Question 7. Why is the tungsten used almost exclusively for filament of electric lamps? Explain. (1 Marks)
Answer. For filament of electric lamp we require a strong metal with high melting point. Tungsten’s melting point is extremely high (34100C.)
Question 8. Why are magnetic field lines closed curves? (1 Marks)
Answer. Because magnetic field lines originate from the north pole of a magnet and ends at its south pole and inside the magnet, it is directed from south pole to north pole.
Question 9. How is induced current in a secondary coil related to current in a primary coil? (1 Marks)
OR
A current of 1A is drawn by a filament of an electric bulb. What would be the number of electrons passing through a cross-section of the filament in 16 s?
Answer. When current in primary coil changes then a current is induced in the secondary coil.
OR
I= q/t
=ne/t
N = I ×t/ e
= 1 ×16 / 1.6 ×10-19
= 1020 electrons.
Question 10. What is the food of amoeba? (1 Marks)
Answer. Amoeba can be found in fresh water, salt water, soil and in some animals including humans. They feed off bacteria , algae, and other protozoa.
Question 11. Write one function of valves in the walls of veins. (1 Marks)
OR
Name the system responsible for transportation of materials in human body.
Answer. The valves in the walls of veins prevent the back flow of blood.
OR
a) Blood vascular system
b) Lymphatic system
Question 12. What are two main components of ecosystem. (1 Marks)
OR
What are the various steps of food chains through which the transfer of food energy takes place is called?
Answer. Biotic and abiotic component.
OR
Trophic levels
Question 13. What are the end products of photosynthesis? (1 Marks)
Answer. Glucose and oxygen
For question numbers 14, 15 and 16, two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
a) Both A and R are true, and R is correct explanation of the assertion.
b) Both A and R are true, but R is not the correct explanation of the assertion.
c) A is true, but R is false.
d) A is false, but R is true.
Question 14. Assertion: Fe2O3 + 2Al ————- Al2O3 + 2Fe (1 Marks)
The above chemical equation is an example of a displacement reaction.
Reason: Aluminium is more reactive than iron, displaces Fe from its oxide.
Answer. a) Both A and R are true, and R is correct explanation of the assertion.
Question 15. Assertion: Bile is essential for the digestion of lipids. (1 Marks)
Reason: Bile juice contains enzymes.
OR
Assertion: Carbohydrate digestion mainly takes place in the small intestine.
Reason: Pancreatic juice contains the enzyme lactase.
Answer. c) A is true, but R is false.
OR
b) Both A and R are true, but R is not the correct explanation of the assertion.
Question 16. Assertion: Mendel selected the pea plant for his experiment. (1 Marks)
Reason: Pea plant is cross-pollinating and has unisexual flowers.
Answer. a) Both A and R are true, and R is correct explanation of the assertion.
Question 17. Read the following and answer the questions: any four (1× 4 marks)
Sanjay studied about blood circulation in humans. He wanted to observe the flow of blood and was about to cut his finger a bit. He suddenly realized that this could be fatal.
(i) The colour of blood is red due to the presence of
a) Haemoglobin.
b) Hemocyanin
c) Chlorophyll.
d) Xanthophyll.
Answer.a) Haemoglobin.
(ii) Which of the following chambers of human heart contain oxygenated blood?
a) Left auricle and left ventricle.
b) Left auricle and right ventricle.
c) Right auricle and left ventricle.
d) Right auricle and right ventricle.
Answer. b) Left auricle and right ventricle.
(iii) The table shows the characteristics of blood in one blood vessel of the body.
Which blood vessel contains blood with these characteristics?
a) Aorta
b) Pulmonary artery.
c) Pulmonary vein
d) Vena cava.
Answer. a) Aorta
(iv) What is the correct route for blood flow in a human heart?
a) Left auricle—left ventricle—lungs—right ventricle—right auricle.
b) Left auricle==left ventricle—right ventricle—right auricle—lungs.
c) Right auricle—right ventricle—left ventricle—left auricle—lungs.
d) Right auricle—right ventricle—lungs—left auricle—left ventricle.
Answer. d) Right auricle—right ventricle—lungs—left auricle—left ventricle.
(v) The blood circulation in human heart is also called the …………………………….. circulation.
Answer. Double circulation.
Question 17. Read the following and answer the questions: any four (1× 4 marks)
Sanjay studied about blood circulation in humans. He wanted to observe the flow of blood and was about to cut his finger a bit. He suddenly realized that this could be fatal.
(i) The colour of blood is red due to the presence of
a) Haemoglobin.
b) Hemocyanin
c) Chlorophyll.
d) Xanthophyll.
Answer.a) Haemoglobin.
(ii) Which of the following chambers of human heart contain oxygenated blood?
a) Left auricle and left ventricle.
b) Left auricle and right ventricle.
c) Right auricle and left ventricle.
d) Right auricle and right ventricle.
Answer. b) Left auricle and right ventricle.
(iii) The table shows the characteristics of blood in one blood vessel of the body.
Which blood vessel contains blood with these characteristics?
a) Aorta
b) Pulmonary artery.
c) Pulmonary vein
d) Vena cava.
Answer. a) Aorta
(iv) What is the correct route for blood flow in a human heart?
a) Left auricle—left ventricle—lungs—right ventricle—right auricle.
b) Left auricle==left ventricle—right ventricle—right auricle—lungs.
c) Right auricle—right ventricle—left ventricle—left auricle—lungs.
d) Right auricle—right ventricle—lungs—left auricle—left ventricle.
Answer. d) Right auricle—right ventricle—lungs—left auricle—left ventricle.
(v) The blood circulation in human heart is also called the …………………………….. circulation.
Answer. Double circulation.
Question 18. Read the following and answer the following questions any four: (1× 4 marks)
Copper sulphate crystal contains water of crystallisation when the crystal is heated the water is removed and salt turns white. The crystal can be moistened again with water. The water of crystallisation is the fixed number of water molecules present in 1 formula unit of copper sulphate. On heating gypsum at 373K, it loses water molecules and became calcium sulphate hemihydrate.
(i) If the crystal is moistened with water ——— colour of crystal reappear.
a) Blue.
b) Green.
c) Black.
d) Pink.
Answer. a) Blue.
(ii)What is the commercial name of calcium sulphate hemihydrate.
a) Washing soda.
b) Bleaching powder.
c) Plaster of Paris.
d) Baking soda.
Answer. c) Plaster of Paris.
(iii) ———– water molecules are present in one formula unit of copper sulphate.
a) Five.
b) Two
c) Six
d) Seven.
Answer. a) Five.
(iv) The salt which possesses water of crystallisation solution is ——————————-.
a)Baking soda.
b) gypsum.
c) washing soda.
d) bleaching powder.
Answer. d) bleaching powder.
(v) The calcium sulphate hemihydrate is prepared by heating one of the following to a temperature of 1000C. This is
a) CaCO3.1/2 H2O.
b) CaCl2 . 1/2 H2O
c) CaSO3. 1/2 H2O
d) CaS04. 1/2 H2O
Answer. d) CaS04. 1/2 H2O
Question 19. Read the following and answer any four questions: (1× 4 marks)
Electric power is the rate of doing work or consumption of energy. Power is given by the rate at which electric energy is dissipated or consumed in an electric circuit. It is also termed as electric power. The commercial unit of electric energy is kilo-watt-hours commonly known as a unit.
(i) The S.I. unit of electric power is
a) Volt.
b) Joule.
c) Watt.
d) Coulomb.
Answer. c) Watt.
(ii) An electric heater is rated at 2 KW electrical energy cost 4 per kWh. What is the cost of using the heater
a) Rs.12
b) Rs.24.
c) Rs. 36
d) Rs. 48.
Answer. b) Rs.24.
(iii) 1 kilowatt is equal to
a) 1000 watts.
b) 100 watts
c) 10000 watts.
d) 10 watts.
Answer. a) 1000 watts.
(iv) An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb.
a) 50W.
b) 110W.
c) 550W.
d) 220W.
Answer. b) 110W.
(v) Power may be given by
a) P=VI.
b) P=I2/R
c) P=V2/R
d) All of these
Answer. d) All of these
Question 20. Read the following and answer any four questions: (1× 4 marks)
Metal has various physical properties which include metallic lustre that they have shining surfaces in their pure state. Metal can be easily beaten into sheets. They are ductile can drawn into wire due to which metal can be given different shapes according to their needs. Metal is a good conductor of heat and has high melting and boiling points.
(i) Which of the following is the least reactive metal?
a) Sodium
b) Silver
c)Copper
d)Lead
Answer. b) Silver
(ii)The metal which is most ductile——————–
a) Gold
b) Aluminium
c) Copper
d) magnesium
Answer. a) Gold
(iii) Which of the following metal exist in a liquid state?
a) Calcium
b) Potassium
c) Mercury
d) Sodium
Answer. c) Mercury
(iv) Which of the following metal is a poor conductor of heat?
a) Silver
b) Copper
c) Lead
d) All of these.
Answer. c) Lead
(v) The property of metal can be beaten in thin sheets is called……….
a) Ductility
b) Malleability
c) Metallic lustre
d) None of these.
Answer. b) Malleability
SECTION B
Question 21. What are the functions of gastric glands present in the wall of the stomach? (2 marks)
OR
Differentiate between excretion and egestion.
Answer. Gastric glands secretes HCl ,pepsin, and mucus.
HCl kills any germ present in food. It makes the medium acidic in stomach for functioning of gastric enzyme.
Pepsinogen converts to pepsin and digests protein.
Mucus precents the inner stomach lining from getting damaged by HCl.
OR
Excretion- It is the process of eliminating waste matter from the human body. It is associated with kidneys, lungs and skin.
Egestion- It is the discharge of undigested material from a cell or from the human body. It is associated with alimentary canal.
Question 22. Why are carbon and its compounds used as fuels for most application? (2 marks)
Answer. * Carbon compounds give a lot of heat and light when burnt in air.
* Burns with clear flame and no smoke is formed,
* Have high calorific value.
Question 23. What are nutrients? (2 marks)
Answer. Substance which an organism obtains from its surroundings and uses it as a source of energy of for the biosynthesis of its body constituents.
Question 24. Equal length of magnesium ribbons are taken in the test tubes A and B. Hydrochloric acid is added to test tube A, while acetic acid is added to test tube B. In which test tube will the fizzing occur more vigorously and why? (2 marks)
Answer. Fizzing will occur more vigorously in test tube A.
HCl is a strong acid and acetic acid is a weak acid therefore HCl contains a greater amount of hydrogen ions and fizzing is due to the evolution of hydrogen gas formed by action of acid and magnesium ribbon.
Question 25. A ray passing through the centre of curvature of a spherical mirror after reflection returns along the same path. Why? (2 marks)
Answer. It strikes along the normal that means it is incident on the mirror at 900 .Hence the incident ray coincides with the normal and retraces its path. Angle of incidence=0.
Diagram page no. 165 fig. 10.5
Question 26. What is an electric fuse? What is its role in electric circuits? (2 marks)
Answer. An electric fuse is a simple device used to interrupt an electrical circuit during overcurrent condition due to short circuit or overload.
It operates on the principle of heating effect of current.
SECTION C
Question 27. Distinguish between acquired and inherited characters with an example of each. (3 marks)
OR
In a pea plant, find the contrasting trait if
(i) The shape of pod is constricted.
(ii) The flower is white in colour.
(iii) The position of flower is terminal.
Answer. Acquired traits- These characters develop in the organism during their lifetime. These do not bring about any change in the genes of organisms. These are lost with the death of the individual.
Inherited traits- These characters are received by organisms from their parents through DNA. These bring change in genes of organisms. These are transferred to next generation.
OR
Contrasting characters were used by Mendel and were classified as dominant or recessive :
Question 28. Give an account of factors affecting the rate of decomposition. (3 marks)
Answer. 1. The rate of decomposition od detritus is affected by climatic factors and chemical quality of detritus.
2. Temperature and soil moisture affect the activities of root microbes.
3. Chemical quality of detritus is determined by relative proportion of water soluble substances , polyphenols ,lignin and nitrogen.
Question 29. How is food transported in plants ? (3 marks)
Answer. Phloem transports food materials from the leaves to different parts of the plant body, which is achieved by utilizing energy from ATP. As a result osmotic pressure in the tiussue increases causing water to move in. This pressure moves the material in the phloem to the tissues which have less pressure.
Question 30. A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. Why do silver articles turn black when kept in the open for a few days ? Name the phenomenon involved. (3 marks)
Answer. When silver is kept in open for a few days it reacts with atmospheric oxygen to form oxide. In due course of time this react with oxygen and hydrogen sulphide to form silver sulphide which appears as black layer. This phenomenon is called tarnishing of silver.
Question 31. The three elements A, B and C with similar properties have atomic masses X, Y and Z. respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as ? Give one example of such a set of elements. (3 marks)
Answer. This arrangement of elements in which the atomic mass of middle element is almost the mean of atomic mass of first and third elements is known as Dobereiner’s triads. Example-Refer page 80 of textbook Table 5.1 and 5.2.
Question 32. Neon and argon are unreactive gases. (3 marks)
(i) What do their atoms have in common.
(ii) Why are they non-reacting gases.
(iii) Write the electronic configuration of these two elements.
Answer. (i) Neon and Argon contain completely filled valence shells , hence their valency is zero. Both are monoatomic gases.
(ii) These elements do not possess any tendency to lose or gain electrons due to fully filled outermost shells. Thus non-reactive.
(iii) Ne- 1s22s22p6
(iv) Ar- 1s22s22p63s23p6
Question 33. What is Tyndall effect? Explain giving any two examples. (3 marks)
Answer. Scattering of light by particles that it encounters in its path is called tyndall effect. When a beam of light enters a smoke-filled dark room through a small hole, then its path becomes visible to us. The tiny dust particles present in air of room scatter the beam of light all around the room.
When sunlight passes through a canopy of a dense forest, where the tiny water droplets in the mist scatter the light.
SECTION D
Question 34. A thin converging lens form a real magnified image and virtual magnified image of an object in front of it . (5 marks)
(i) Write the position of the objects in each case.
(ii) Draw ray diagram to show the image formation in each case.
(ii) How will the following be affected on cutting this lens into two halves along the principal axis?
a) Focal length
b) Intensity of the image formed by half lens.
OR
Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.
Answer. (i) Object is placed between F and 2F of the converging lens. Object is placed between optical centre and F.
(ii) Figure for real magnified image – Refer page 180 of textbook 10.16 (d) For virtual magnified image- Refer 10.16 (f)
(iii) a) There will be no change in focal length of converging lens.
(iv) b)Intensity will become one-fourth and brightness of lens will be less.
OR
Laws of refraction
a) Incident ray, refracted ray and normal at the point of incidence lie in the same plane.
b) Ratio of sine of incidence and sine of refraction is constant for the given colour and pair of media.
Diagram- Refer page 173 fig. 10.10
Question 35. The diagram shows modes of asexual reproduction in animals. (5 marks)
Using the above diagram, answer the following questions:
(i) Name one organism each which reproduces by binary fission and multiple fission.
(ii) What is the difference between binary fission and multiple fission.
(iii) How Planaria reproduce?
(iv) In which reproductive method an organism produces an outgrowth on its body surface
(v) How Rhizopus reproduce under suitable conditions?
Answer. (i) Amoeba-binary fission, Plasmodium- multiple fission.
(ii) Fission in which parent cell divide to form two similar daughter cells is binary fission and when parent form more than two daughter cells it is multiple fission.
(iii) By regeneration in which an organism is split into several parts which develops into a new individual.
(iv) In budding.
(v) In Rhizopus, the thick walled spores have the capacity to develop into new individuals under suitable conditions.
Question 36. (i) Explain the meaning of words “electromagnetic” and “induction” in the term electromagnetic induction. List three factors on which the value of induced current produced in a circuit depends. (5 marks)
(ii) Name the rule used to determine the direction of induced current. State one practical application of this phenomenon in everyday life.
OR
(i) Name and state the rule to find the direction of force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.
(ii) Draw a well labelled diagram of an electric motor.
Answer.
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