RBSE Class 10 E-Science Self Evaluation Test Papers in English

Students must start practicing the questions from RBSE 10th Science Model Papers E-Science Self Evaluation Test Papers in English Medium provided here.

Time: 2:45 Hours
Maximum Marks: 80

General Instructions to the Examinees:

• Candidate must write first his/her Roll No. on the question paper compulsorily.
• All the questions are compulsory.
• Write the answer to each question in the given answer book only.
• For questions having more than one part, the answers to those parts are to be written together in continuity.

RBSE Class 10 E-Science Self Evaluation Test Paper 1 in English

Section-A

1. Objective Type Questions

(i) Which of the following are energy foods ? [1]
(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage

(ii) In which mode of nutrition an organism derives its food from the body of another living organism without killing it? [1]
(a) Saprotrophic nutrition
(b) Parasitic nutrition
(c) Holozoic nutrition
(d) Autotrophic nutrition

(iii) Adrenaline, noradrenaline, serotonin are called ? [1]
(a) Amines
(b) Neuro transmiltcrs
(c) Neuro actors
(d) None

(iv) The shape of guard cells changes due to change in ……………….. [1]
(a) Protein composition of cells
(b) Temperature of cells
(c) Amount of water in cells
(d) Position of nucleus in cells.

(v) The nature of the graph between potential difference and the electric current flowing through a conductor is [1]
(a) Parabolic
(b) Circle
(c) Straight line
(d) Hyperbolic

(vi) The heating element of an electric iron is made up of [1]
(a) Copper
(b) Nichrome
(c) Aluminium
(d) Iron

(vii) Power of the lens is – 40D. Its focal length is [1]
(a) 4 m
(b) – 40 m
(c) – 0.25 m
(d) – 25 m

(viii) In opitical phenomena, twinkling of stars, is due to [1]
(a) Atmospheric reflection
(b) Total reflection „
(c) Atmospheric refraction
(d) Total refractiorr

(ix) No force acts on a current-carrying conductor when it is placed. [1]
(a) perpendicular to the magnetic field
(b) parallel to the magnetic filed
(c) far away from the magnetic field
(d) inside a magnetic field

(x) Which information is not conveyed by a balanced chemical equation ? [1]
(a) Physical states of reactants and products
(b) Symbols and formulae of all the substances involved in a particular reaction.
(c) Number of atoms/molecules of the reactants and products formed.
(d) Whether a particular reaction is actually feasible or not.

(xi) The nature of calcium phosphate present in tooth enamel is [1]
(a) Basic
(b) Amphoteric
(c) Acidic
(d) Neutral

(xii) An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that [1]
(a) Green solution slowly turns brown .
(b) Lower end of test tube becomes slightly warm .
(c) A colourless gas with the smell of burning sulphur is observed .
(d) Light green solution changes to blue

2. Fill in the Blanks

(i) ………………………. regulates menstrual cycle. [1]
(ii) Dodder is a …………………. flowering plant. [1]
(iii) ……………………. is also known as ‘waterman of India’. [1]
(iv) Coliform is a group of ……………………. . [1]
(v) The bending ability of a medium is ……………………….. . [1]
(vi) kWh is also known as …………………….. . [1]

3. Very Short Answer Type Questions

(i) Which blood vessel brings oxygented blood from lung to heart ? [1]

(ii) Which mineraHs required for making thyroxin hormone ? [1]

(iii) What name is given to the network of food chains ? [1]

(iv) Name a gas released by the incomplete burning of coal and petroleum which is deadly poisionous in high concentration. [1]

(v) According the which protocal India is to reduce C02 emission by 5% of 1990 level, during 2008-12? [1]

(vi) How are Ammeter and Voltmeter connected in circuit ? [1]

(vii) What is the effect of increasing the number of turns on magnetic field due to a circular coil ? [1]

(viii) What is a magnetic field? [1]

(ix) Name the acid present in tomato. [1]

(x) Choose strong acids from the following: CH₃COOH. H₂SO₄, H₂CO₃, HNO₃ [1]

(xi) A white coloured powder is used by doctors for supporting fractured lxrnes. Write (he chemical naine and formula of this powder. [1]

(xii) Why does tap waler conduct elecuicity where distilled water does not? [1]

Section – B

Short Answer Type Questions : (Word limit up to 50 words)

Question 4.
Write the balanced chemical equation for the process of photosynthesis. When do the desert plants take up carbon dioxide and perform photosynthesis? [2]

Question 5.
What evidence do we have for the origin of life from inanimate matter ? [2]

Question 6.
How can we say that change in genes can be brought about by change in DNA? [2]

Question 7.
What are the after effects of ozone depletion ? [2]

Question 8.
Explain with the help of diagram, why a pencil partly immersed in water appears to be bent at the water surface. [2]

Question 9.
Two resistors of 10 Ω. are connected in series to a battery of 6V. How can the values of current passing through them be compared ? [2]

Question 10.
A wire df resistane 20 Ω is bent to form closed square. What is the resistance across a diagonal of the square ? [2]

Question 11.
State the consquences that can lead to a short circuit. [2]

Question 12.
“We need to balance a skeltal chemical equation.” Give reason to justify the statement. [2]

Question 13.
Name the reducing agent in the following reaction: 3MnO₂ + 4Al → 3Mn + 2Al₂O₃ State which is more reactive, Mn or A1 and why ? [2]

Question 14.
Copper coin is kept immersed in silver nitrate solution for some time. What change will take place in coin and colour of the solution ? [2]

Question 15.
An ore on treatment with dilute hydrochloric acid produces brisk effervescence. What type of ore is this ? What steps will be required to obtain metal from the enriched ore ? [2]

Question 16.
Give reason for the following:
(a) School bells are made of metals.
(b) Electric wires are made of copper. [2]

Section – C

Long Answer Type Questions : (Word limit upto 100 words)

Question 17.
Draw a diagram of human respiratory system and label the following:
(i) Part where air is filtered by fine hair and mucus.
(ii) Part which terminates in balloon-like structures.
(iii) Balloon-like structures where exchange of gases takes place. [3]
OR
Explain the process of nutrition in Amoeba with suitable diagram. [3]

Question 18.
Distinguish between acquired and inherited traits by giving one example of each. Why are traits acquired during the lifetime of an individual not inherited ? [3]
OR
The human being who look so different from each other in terms of colour, size, and looks are said to belong to the same species. [3]

Question 19.
How will the magnetic field produced at a point due to a current-carrying circular coil change if we:
(i) increase the current flowing through the coil ?
(ii) reverse direction of current through the coil ?
(iii) increase the number of turns in the coil ? [3]
OR
Describe an activity to show the magnetic field lines produced when current is passed through the circular coil. [3]

Question 20.
Name the type of chemical reaction represented by the following equation:
(i) CaO + H₂O → Ca(OH)₂
(ii) 3BaCl₂ + Al₂(SO₄)₃ → 3BaSO₄+ 2AlCl₃
[3]
OR
(i) Write the essential condition for the following reaction to take place: 2AgBr → 2Ag + Br₂
Write one application of this reaction. ,
(ii) Complete the following chemical equation of a chemical reaction:
2FeSO₄ Fe₂O₃ + ……………….. + ……………….
(iii) What happens when water is added to quick lime ? Write the chemical equation. [3]

Section – D

Essay Type Questions : (Word limit upto 250 words)

Question 21.
(i) What is meant by reflex action ?
(ii) With the help of a labelled diagram trace the Sequence of events which occur when we touch a hot object. [4]
OR
(i) Name the hormone which is released into the blood when its sugar level rises. [4]
(ii) Explain the need of chemical communication in multicellular organisms. Name the organ which produces this hormone and mention its effect on blood sugar level. Also mention the digestive enzymes secreted by this organ with one fuction of each.

Question 22.
Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed:
(i) at the centre of curvature of a concave mirror.
(ii) between the pole P and focus F of a concave mirror.
(iii) In front of a convex mirror.
(iv) at 2F of a convex lens. [4]
OR
(i) It is desired to obtain an erect image of an object, using a concave mirror of focal length 20 cm.
(a) What should be the range of distance of the object from the mirror?
(b) Will the image be bigger or smaller than the object ? [4]

Question 23.
Equal length of magnesium ribbon are taken in two test tubes ’A’ and ’B’ H₂SO₄ is added to test tube ‘A’ and H₂CO₃ in the test tube ‘B’ in equal amounts:
(a) Identify the test tube showing vigorous reaction.
(b) Give reason to support your answer.
OR
Describe an activity with diagram to illustrate that the reaction of metal carbonates and metal bicarbonates with acids produces carbon dioxide. Write the relevant equations of all the reactions’that take place. [4]

RBSE Class 10 E-Science Self Evaluation Test Paper 2 in English

Section – A

1. Objective Type Questions

(i) Roots of the plants absorb water from the soil through the process of: [1]
(a) Diffusion
(b) Transpiration
(c) Osmosis
(d) None of these

(ii) In amoeba, food is digested in the: [1]
(a) Food vacuole
(b) Mitochondria
(c) pseudopodia
(d) Chloroplast

(iii)In a neuron, conversion of electrical signal to a chemical signal occurs at/in : [1]
(a) Cell body
(b) Axon end
(c) Dendrite end
(d) Axon

(iv) Which of the following is a plant hormone? [1]
(a) Insulin
(b) thyroxin
(c) Oestrogen
(d)Cytokinin

(v) The laws of reflection hold good for [1]
(a) Plane mirror only
(b) Concave mirror only
(c) Convex mirror only
(d) All mirrors

(vi) Under which of the following conditions a concave mirror can form a real image larger than the aetual object? [1]
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is kept at a distance greater than its radius of curvature
(d) When object is placed between the focus and centre of curvature

(vii) An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be [1]
(a) 100 W
(b) 75 W
(c) 50 W
(d) 25 W

(viii) A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 21 and resistance R of the same material will have area of cross section :
(a) A/2
(b) 3A/2
(c) 2A
(d) 3 A [1]

(ix) Magnetic field due to a current-carrying straight wire depends upon: [1]
(a) current only
(b) distance from the wire only
(c) (a) and (b) both
(d) none of the above

(x) Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is: [1]
(a) 1 : 1
(b) 2 : 1
(c) 4 : 1
(d) 1 : 2

(xi) A solution turns red litmus blue. Its pH is likely to be: [1]
(a) 1
(b) 4
(c) 5
(d) 10

(xii) Which of the following methods is suitable for preventing an iron frying pan from rusting? [1]
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above

2. Fill in the Blanks

(i) The movement of shoot towards light is ………………… . [1]
(ii) A green pigment found in plants, is called …………………… . [1]
(iii) ………………….. forests of Bengal are dominated by Sal. [1]
(iv) ………………….. bacteria inhabiting intestine of human beings pollute water. [1]
(v) ………………… is the power of the lens when its focal length is 1 metre. [1]
(vi) The current flowing in the conductor is inversely proportional to ………………… . [1]

3. Very Short Answer Type Questions

(i) Name a protease of pancreatic juice. [1]

(ii) How do roots respond to the presence of Auxin? [1]

(iii) What term is used to describe the direction of energy flow in an ecosystem? [1]

(iv) Which gas is released by the buring of coal and petroleum and adds to global warming? [1]

(v) To which state of our country would you associate the Khejri tree? [1]

(vi) What is the resistance of a voltmeter? [1]

(vii) What is a natural magnet? [1]

(viii) What is electric generator ? [1]

(ix) Name two synthetic indicators. [1]

(x) What happens when nitric acid is added to an egg shell ? [1]

(xi) What contributes to the basic character of a base ? [1]

(xi) Name two organic acids. [1]

Section – B

Short Answer Type Questions : (Word limit upto 50 words)

Question 4.
Why do herbivores have longer, small intestine than carnivores? [2]

Question 5.
How is the equal genetic contribution of male and female parents ensured in the progeny ? [2]

Question 6.
What do you understand by reproductive isolation ? [2]

Question 7.
What is the role of decomposers in the ecosystem ? [2]

Question 8.
With the help of a ray diagram explain why a convex mirror is perferred for rear view mirrors in motor cars? [2]

Question 9.
Series arrangements are not used for domestic circuits. List any three reasons. [2]

Question 10.
A piece of wire of resistance 20 Ω. is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation. [2]

Question 11.
Why and when does a current-carrying conductor kept in a magnetic field experience force ? List the factors on which direction of this force depends. [2]

Question 12.
Write the chemical equation of the reaction in which the following changes have taken place with an example of each:
(i) Change in colour
(ii) Change in temperature [2]

Question 13.
What happens when water is added to quick lime ? Write thd chemical equation. [2]

Question 14.
Write electron dot diagram for chlorine (Atomic No. 17) and calcium (Atomic No. 20). [2]

Question 15.
Name the following:
(a) A metal, which is preserved in kerosene
(b) A lustrous, coloured non-metal
(c) A metal, which can melt while kept on palm.
(d) A metal, which is poor conductor of heat. [2]

Question 16.
Aluminium oxide is considered as an amphoteric oxide. Why ? Give reason. [2]

Section – C

Long Answer Type Questions : (Word limit upto 100 words)

Question 17.
Name the site of exchange of material between the blood and surrounding cells. Draw a schematic representation of transport and exchange of oxygen and carbon dioxide in human body [3]
OR
Draw a diagram to show open stomatal pore and label on it (i) guard cells (ii) cliloroplast. [3]

Question 18.
Explain the mechanism of sex determination in humans. [3]
OR
With the help of suitable examples explain natural selection. [3]

Question 19.
What is short circuiting ? State one factor/condition that can lead to it. Name a device in the household that acts as a safety measure for it. State the principle of its working. [3]
OR
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (a) pushed into the coil ,
(b) withdrawn from inside the coil
(c) held stationary inside the coil ? [3]

Question 20.
2g of ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation for the reaction. [3]
OR
State the type of chemical reactions and chemical equations that take place in the following : 3
(i) Magnesium wire is burnt in air.
(ii) Electric current is passed through water. [3]

Section – D

Essay Type Questions : (Word limit upto 250 words)

Question 21.
State the structural and the functional unit of the nervous system. Draw its neat labelled diagram and write its two
functions. [4]
OR
(a) Name the diseases by which a person is likely to suffer due to the deficiency of :
(i) Iodine (ii) Insulin
(b) How is the’ timing of secretion and amount of hormone secretion are regulated in human system ? Explalxwith example. [4]

Question 22.
(a) If the image formed by a lens is diminished in size and erect for all positions of the object, what type of lens is it?
(b) Name the point on the lens through which a ray of light passes undeviated.
(c) An object is placed perpendicular to the principal axis of a convex lens’ of focal length 20 cm. Find (i) the position
(ii) The magnification of the image formed. [4]
OR
For which position of the object does a convex lens form a virtual and erect image ? Explain with the help of a ray diagram. [4]

Question 23.
A white coloured powder is used by doctors for supporting fractured bones.
(a) Write the chemical name and formula of the powder.
(b) When this white powder is mixed with water, a hard solid mass is obtained. Write the balanced chemical equation for the change. [4]
OR
(a) A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. Predict the nature of each solution.
(b) Why docs.cake or bread swell on adding baking powder ? Write the chemical equation involved. [4]

RBSE Class 10 E-Science Self Evaluation Test Paper 3 in English

Section – A

1. Objective Type Questions

(i) The exit of unabsorbed food material is regulated by [1]
(a) liver
(b) Anus
(c) Small intenstine
(d) Anal sphincter

(ii) The breakdown of pyruvate to give carbon dioxide, water and energy takes place in: [1]
(a) Cytoplasm
(b) Mitochondria
(c) Chloroplast
(d) Nucleus

(iii) Posture and balance of the body is controlled by: [1]
(a) Cerebrum
(b) Cerebellum
(c) Medulla
(d) Pons

(iv) Which of the following is associated with growth of plants? [1]
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid

(v) A full length image of a distant tall building can definitely be seen by using a [1]
(a) concave mirror
(b) convex mirror
(c) plane mirror
(d) both concave as well convex mirror

(vi) You are given water, mustard oil, glycerine and kerosene. In which of the these media a ray of light incident obliquenly at same angle would bend the most? [1]
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine

(Vii) What is the maximum resistance which can be made using five resistors each of (1/5)Ω? [1]
(a) (1/5)Ω
(b) 10 Ω
(c) 5 Ω
(d) 1 Ω

(viii) If the current I through resistor is increased by 100%. The increase in power dissipated will be [1]
(a) 100%
(b) 200%
(c) 300%
(d) 400%

(ix) The magnetic field inside a solenoid is [1]
(a) Non-uniform
(b) Circular
(c) Uniform
(d) None of these

(x) 2KBr(aq) + BaI₂(aq) + BaBr₂(s). The given reaction is an example of [1]
(a) Composition reaction
(b) Double displacement reaction
(c) Combination reaction
(d) Displacement reaction

(xi) The two colours seen at the extreme ends of the pH chart are [1]
(a) Red and Blue
(b) Red and Green
(c) Green and Blue
(d) Orange and green

(xii) Which of the following are not ionic compounds [1]
(i) KCl
(ii) HCl
(iii) CCl₄
(iv) NaCl
(b) (ii) and (iii)
(d) (i) and (iii)

2. Fill in the Blanks

(i) ………………… is caused by deficiency of insulin in our body. [1]
(ii) ………………… and energy requirements of the autotrophic organims are fulfilled by photosynthesis. [1]
(iii) …………………… is the most rapidly dwindling natural resource in the world. [1]
(iv) Khadins is an example of …………………… . [1]
(v) When an object is placed between F and ………………… of the convex lens, the image formed is virtual and enlarged. [1]
(vi) The resistance of conductors …………………… with increase in temperature. [1]

3. Very Short Answer Type Questions

(i) Name the two conducting elements of Xylem. [1]

(ii) What are the two parts of the nervous system of higher animals. [1]

(iii) What type of organisms of an ecosystem are known as energy transformers? [1]

(iv) What are the two broad categories of natural resources? [1]

(v) Name the three ’R’ of the conservation strategy. [1]

(vi) What happens to the current in a circuit if its resistance is doubled? [1]

(vii) What is the direction of magnetic field lines around a magnet? [1]

(viii) What is the basic cause of induced emf? [1]

(ix) What would be the pH of a salt of weak acid and strong base. [1]

(x) Name a base which is not an alkali. [1]

(xi) What is the name given to a reaction between an acid and base? [1]

(xi) Name two mineral acids. [1]

Section – B

Short Answer Type Questions : (Word limit upto 50 words)

Question 4.
Why do the walls of the trachea not collapse when there is less air in it? [2]

Question 5.
Give one example each of characters that are inherited and the ones that are acquired in humans. Mention the difference between the inherited and the acquired characters. [2]

Question 6.
How can it be said that birds are closely related to reptiles? [2]

Question 7.
Describe how decomposers faciliate recycling of matter in order to balance in the ecosystem. [2]

Question 8.
Define the principal focus of a concave mirror. Find the focal length of a spherical mirror having radius of curvature as 20 cm. [2]

Question 9.
A given length of a wire is doubled on itself and this process is repeated once again. By what factor does the resistance of the wire .change? [2]

Question 10.
What is an electric circuit? Distinguish between an open and a closed circuit. [2]

Question 11.
Justify that magnetic field lines are closed curves. [2]

Question 12.
Explain two ways by which food industries prevent rancidity. [2]

Question 13.
Write the chemical equation reaction talking place when
(a) Iron reacts with steam
(b) Magnesium reacts with dil HCl. [2]

Question 14.
State the electron dot structure for calcium and sulphur. [2]

Question 15.
What is meant by‘rusting’? [2]

Question 16.
Why are aqueous solutions of ionic compounds able to conduct electricity? [2]

Section – C

Long Answer Type Questions : (Word limit upto 100 words)

Question 17.
Draw a diagram of human excretory system and label kidneys, urinary bladder on it. [3]
OR
Draw a diagram of human respiratory system and lable on it:
(i) Diaphragm
(ii) Larynx
(iii) Trachea [3]

Question 18.
Explain with examples how the following are evidences in favour of evolution in organisms. 3
(i) Homologous organs
(ii) Analagous organs
(iii) Fossils [3]
OR
Give an example of body characteristics used to determine how close two species are in terms of evolution and explain it. [3]

Question 19.
State the main difference between AC and DC Why is AC preferred over DC for long range transmission of electric power? Name one source each of DC and AC. [3]
OR
One of the major causes of fire in office buildings is short circuiting. List three factors, which may lead to a short circuit. [3]

Question 20.
Write the balanced chemical equation for the following reactions: [3]
(i) Phosphorus bums in presence of chlorine to form phosphorus penta chloride ,
(ii) Burning of natural gas.
(tii) The process of respiration [3]
OR
Identify the type of reaction (s) in the following and define the reaction: [3]
(a) CH₄ + 2O₂ → CO₂ + 2H₂O
(b) Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃
(c) CaO + H₂O → Ca(OH)₂
(d) CuSO₄ + Zn → ZnSO₄ + Cu

Section – D

Essay Type Questions : (Word limit upto 250 words)

Question 21.
(a) Define reflex action. State its significance.
(b) How do plants respond to external stimuli? [4]
OR
(a) Draw a neat diagram of human brain and label on it the following parts:
(i) Midbrain ,
(ii) Pituitary gland
(b) Explain the need of chemical communication in multicellular organsims. [4]

Question 22.
(a) What is meant by‘power of a lens’?
(b) State and define the SI unit of power of a lens.
(c) A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other. Calculate the optical power of this combination. [4]
OR
(a) List four properties of the image formed by a plane mirror.
(b) Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface. [4]

Question 23.
(a) You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7.
(i) Identify the most acidic and most basic solution.
(ii) Arrange the above four solutic is in the increasing order of H+ ion concentration. [4]

(b) State the change in colour of pH paper on dipping in solution C and D. [4]
OR
Dry pellets of a base ‘X’ when kept in open absorb moisture and turn sticky. The compound is also formed by chlor-alkali process. Write the chemical name and formula of X. Describe chlor-alkali process with balanced chemical equation. Name the type of reaction occurs when X is treated with dilute hydrochloric acid. Write the chemical equation.

RBSE Class 10 E-Science Self Evaluation Test Paper 4 in English

Section-A

1. Objective Type Questions

(i) The mode of nutrition found in fungi is: [1]
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotropic nutrition
(d) Saprotropic nutrition

(ii) The contraction and expansion movement of the walls of the food pipe is called: [1]
(a) Translocation
(b) Transpiration
(c) Peristaltic movement
(d) Digestion

(iii) The gap between two neurons is called: [1]
(a) Dendrite
(b) Synapse
(c) Axon
(d) Impulse

(iv) The main function of abscisic acid in plants is to: [1]
(a) Increase the length of the cells
(b) Promote cell division
(c) Inhibit growth
(d) Promote growth of stem

(v) Which one of the following materials cannot be used to make a lens ? [1]
(a) Water
(b) Glass
(c) Plastic
(d) Clay

(vi) A spherical mirror and a thin spherical lens have each a focal length of – 15 cm. The mirror and lens are likely to be [1]
(a) Both are concave
(b) Both are convex
(c) The mirror is concave but the lens is convex
(d) The mirror is convex, but the lens is concave

(vii) A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’. Then ratio R/R’ is [1]
(a) 1/25
(b) 1/5
(c) 5
(d) 25

(viii) Which of the following^pes not represent electrical power in a circuit ? [1]
(a) I²R
(b) IR²
(c) VI
(d) V²/R

(ix) The phenomenon of electromagnetic induction is: [1]
(a) The process of charging a body
(b) The process of generating magnetic field due to a current passing through a coil
(c) Producing induced current in a coil due to relative motion between a magnet and the coil
(d) The process of rotating a coil of an electric motor

(x) Which among the following is (are) double displacements reaction (s) ? [1]
(i) Pb + CuCl₂ → PbCl₂ + Cu
(ii) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl
(iii) C + O₂ → CO₂
(iv) CH₄ + 2O₂ → CO₂ + 2H₂O
(a) (i) and (iv)
(b) (ii) only
(c) (i) and (ii)
(d) (iii) and (iv)

(xi) Which one of the following types of medicines is used for treating indigestion ? [1]
(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic

(xii) Which of the following pairs will give displacement reactions ? 1
(a) NaCl solution and aluminium metal
(b) MgCl₂ soltition and aluminium metal
(c) FeSO₄ solution and copper metal
(d) AgNO₃ solution and copper metal

2. Fill in the Blanks

(i) Taste receptors are called …………………… . [1]
(ii) …………………. is the excretory unit of a kidney. [1]
(iii) …………………… means hug the tree movement. [1]
(iv) Monoculture means growing …………………….. plant species in a forest. [1]
(v) The path of light is bent as it crosses the boundary between two media due to [1]
(vi) SI unit of electric current is …………………… . [1]

3. Very Short Answer Type Questions

(i) Name the term used for the transport of food from leaves to other parts of plant. [1]

(ii) Name two types of receptors of our body which perceive chemical stimuli. [1]

(iii) What are the two main components of an ecosystem ? [1]

(iv) Name a gas released by the incomplete burning of coal and petroleum which is deadly posionous in high concentration. [1]

(v) What is the process of growing of forests in an area which has been cleared of forest known as ? [1]

(vi) What is the other name of Joule/Coulomb ? [1]

(vii) Name the SI unit of magnetic field. [1]

(viii) What is a solenoid? [1]

(ix) Write the two components of baking powder. [1]

(x) Name one oxide which reacts with water to give an acid. [1]

(xi) What is the optimum pH range for living organisms? [1]

(x) What colour change would you observe in red litmus with aqueous magnesium hydroxide? [1]

Section – B

Short Answer Type Questions : (Word limit up to 50 words)

Question 4.
What are the final products after digestion of carbohydrates and proteins? [2]

Question 5.
Describe briefly four ways in which individuals with a particular trait may increase in a population. [2]

Question 6.
“Our teeth and elephant’s tusks are homologous organs” . Jusfity this statement. What do the analogous organs indicate? [2]

Question 7.
How is ozone formed in the upper atmosphere? Why is the damage of ozone layer a cause of concern to us? State a cause of this damage. [2]

Question 8.
Find the focal length of a lens of power 20D. What type of lens is this? [2]

Question 9.
State the difference between the wire used in the element of an electric heater and in a fuse wire.

Question 10.
A torch bulb is rated 2.5 V and 750 mA. Calculate
(i) its power and
(ii) its resistance, [2]

Question 11.
Justify that two magnetic field lines never intersect each other, [2]

Question 12.
Write balanced chemical equations for the following reactions: [2]
(a) Silver bromide on exposure to sunlight decomposes into silver and bromine.
(b) Sodium metal reacts with water to form’sodium hydroxide and hydrogen gas.

Question 13.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. [2]

Question 14.
Write the electron dot structure for potassium and chlorine [2]

Question 15.
Carbon cannot be used as reducing agent to obtain Mg from MgO. Why? [2]

Question 16.
How is copper obtained from its sulphide ore? Give equations of the reactions. [2]

Section – C

Long Answer Type Questions : (Word limit up to 100 words)

Question 17.
How is ‘respiration’ different from ‘breathing’ ? Explain the process of aerobic and anaerobic respiration. [3]
OR
Explain the schematic representation of gaseous exchange in tissues. [3]

Question 18.
What is meant by the term speciation? List four factors which could lead to speciation. [3]
OR
Define the term ‘evolution’. “Evolution cannot be equated with progress”. Justify this statement. [3]

Question 19.
What is meant by solenoid? How does a current-carrying solenoid behave? Give its main use. [3]
OR
Describe an activity with labelled diagram to show that a current carrying conductor experiences a force in a magnetic field. [3]

Question 20.
Describe an activity to observe what happens when quick lime is added to water taken in a beaker. State two important observations and name the type of reaction taking place. [3]
OR
What is rancidity? Mention any two ways by which rancidity can be prevented. [3]

Section – D

Essay Type Questions : (Word limit upto 250 words)

Question 21.
(a) List in tabular form three differences between nervous control and chemical control.
(b) Mention the part of the body where gustatory and olfactory receptors are located. [4]
OR
State the functions of plant hormones. Name four different types of plant hormones. [4]

Question 22.
(a) Draw a ray diagram to show the formation of image of an object placed between infinity and the optical centre of a concave lens.
(b) A concave lens of focal length 15 cm forms an image 10 cm from the lens. Calculate :
(i ) The distance of the object from the lens.
(ii) The magnification for the image formed. [4]
OR
(a) Under what condition will a glass lens placed in a transparent liquid become invisible.
(b) Describe and illustrate with a diagram, how we should arrange two converging lenses so that a parallel beam of light entering one lens emerges as a parallel beam after passing through the second lens. [4]

Question 23.
A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? What will happen if excess of gas is passed through lime-water? Write these with the help of balanced chemical equations for all the changes observed. [4]
OR
Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. Write its chemical name and formula. How is it manufactured? Write the chemical equation for the reaction involved. Also list two other uses of the compound. [4]