These Sample papers are part of CBSE Sample Papers for Class 10 Science. Here we have given CBSE Sample Papers for Class 10 Maths Paper 14.
CBSE Sample Papers for Class 10 Science Paper 14
|Sample Paper Set||Paper 14|
|Time Allowed||3 hours|
|Category||CBSE Sample Papers|
Students who are going to appear for CBSE Class 10 Examinations are advised to practice the CBSE sample papers given here which is designed as per the latest Syllabus and marking scheme as prescribed by the CBSE is given here. Paper 14 of Solved CBSE Sample Paper for Class 10 Science is given below with free PDF download solutions.
- The question paper comprises two sections, A and B. You are to attempt both the sections.
- All questions are compulsory.
- All questions of Section-A and B are to be attempted separately.
- There is an internal choice in three questions of three marks each, two questions of five marks each and one question
- (for assessing the practical skills) of two marks.
- Question numbers 1 and 2 in Section-A are one mark question. They are to be answered in one word or in one sentence.
- Question numbers 3 to 5 in Section- A are two marks questions. These are to be answered in 30 words each.
- Question numbers 6 to 15 in Section-A are three marks questions. These are to be answered in about 50 words each.
- Question numbers 16 to 21 in Section-d are five marks questions. These are to be answered in 70 words each.
- Question numbers 22 to 27 in Section- B are based on practical skills. Each question is a two marks question. These are to be answered in brief.
An aqueous solution of which of the following oxides turn the blue litmus red? MgO, SO2, Al2O3
Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne.
Name the four parts labelled as 1, 2, 3 and 4 in the given diagram.
- In the following food chain, grass provides 4000 J of energy to the grasshopper. How much energy will be available to snakes and frogs ? Grass → Grasshopper → Frogs + Snakes
- What is meant by ‘non-biodegradable’ waste? Identify biodegradable waste from the following: empty packet of chips, empty plastic bottle of mineral water, empty paper box of sweets, empty tin of a cold drink.
Local people around forests are referred to as “stakeholders” for conservation of forests. Give reasons.
Aqueous solutions of sodium sulphate and barium chloride react as follows:
Na2SO4 + BaCl2 → BaSO4(s) ↓ + 2NaCl
- Identify the type of reaction.
- Define the type of reaction.
- Suggest other name to this reaction.
A student adds water to quicklime taken in a beaker. He feels the beaker turning hot. Why does this happen? Write a chemical equation for the reaction. State the type of this reaction.
Zinc is a metal found in the middle of the activity series of metals. In nature, it is found as a carbonate ore, ZnCO3. Mention the steps carried out for its extraction from the ore. Support with equations.
An organic compound A of molecular formula C2H4 on reduction gives another compound B of molecular formula C2H6. B on reaction with chlorine in the presence of sunlight gives C of molecular formula C2H5 Cl.
- Name the compounds A, B and C.
- Write chemical equation for the conversion of A to B and name the, type of reaction.
Draw a diagram of reflex arc and label in it sensory neuron, motor neuron, relay neurons, receptor.
How does our body respond when adrenal gland secretes its hormone ?
Given below is the experiment carried out by Mendel to study inheritance of two traits in garden pea.
- What do A, B, C, D, E, F and G represent in these boxes ?
- State the objective for which Mendel performed this experiment.
From the set of figures given below, make a pair of
- homologous and
- analogous organs. State the reason in each case to justify your answer.
Akshay, sitting in the last row in his class, could not see clearly the words written on the blackboard. When the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay’s parents advising them to get his eyesight checked. In the context of the above event, answer the following questions:
- Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect?
- State the values displayed by the teacher and Salman.
- In your opinion, in what way can Akshay express his gratitude towards the teacher and Salman?
Name the three types of wires used in household circuits. Out of these three which wire is used as a safety measure especially for those appliances that have metallic body. State the colour of insulation used for this wire. How it ensures the safety of the user?
What potential difference is maintained between the live wire and the neutral wire in our domestic electric supply? The main power supply of a house is through a 5 A fuse. How many 100 W bulbs can be used in this house at the correct voltage?
“We are looking for an alternative or non-conventional sources of energy.” State three reasons for it.
State the function of the following in a solar cooker:
- glass plate
- blackened surface
A student takes three beakers A,B and C filled with aqueous solution of glucose, alcohol and hydrochloric acid respectively as shown in the following figure:
- State your observation in terms of glowing of bulb when the switch is on.
- Justify your observations by giving reason in each case.
- Mention the change noticed with appropriate reason if the content of beaker B is replaced by sodium hydroxide solution
Two test tubes A and B are taken containing solid sodium carbonate and sodium hydrogencarbonate respectively. Some dilute HCI is poured in both the test tubes.
- Name the main products formed with their chemical formula in A and B.
- State the similarity between both the activities.
- Name the compound that is formed when electricity is passed through an aqueous solution of the main product obtained in the above mentioned activity.
- State your observation with a balanced chemical equation when the gas evolved in test tube B during the activity passes through lime water.
- State the basis of classification of elements in the Modern Periodic table.
- An element belongs to group 17 of the periodic table, how many electrons does it have in its outermost shell? .
Giving reasons, explain the following:
- Element A is a non-metal.
- Element D is more electronegative than E.
- Which type of ion, cation or anion will be formed by element C?
Draw a diagram of human alimentary canal and label :
- organ which transport food from mouth to stomach
- organ which secretes bile juice.
- organ which stores bile
- organ in which absorption of digested food takes place.
- Name the enzyme present in saliva and state its function
- Draw a diagram of human respiratory system and label:
- organ that is surrounded by cartilaginous rings.
- structure where exchange of gases takes place.
- voice box.
- muscular structure which flattens during inhalation.
- Why do aquatic animals have a faster rate of breathing as compared to terrestrial animals?
- Name the parts of flower which contain germ cells.
- What is the difference between self pollination and cross pollination?
- Testes are located outside the abdominal cavity. Why?
- Fertilisation is possible if copulation has taken place during middle of menstrual cycle. Give reason.
- What happens when the egg is not fertilised?
- Define power of a lens.
- An object is kept at a distance of 18cm, 20cm, 22cm and 30cm, from a lens of power +5D.
- In which case or cases would you get a magnified image?
- Which of the magnified image can be get on a screen?
- List two widely used applications of a convex lens.
Draw a schematic diagram of an electric circuit (in the ‘on’ position) consisting of a battery of five cells of 2V each, a 5Ω resistor, on 8Ω resistor, a 12 Ω resistor and a plug key, all connected in series. An ammeter is put in the circuit to measure the electric current through the resistors and a voltmeter is connected so as to measure the potential difference across the 12 Ω resistor. Calculate the reading shown by the :
- voltmeter in the above electric circuit.
Renu added some iron filings to 100 mL of copper sulphate solution. After sometime she observed that the colour of the solution changed and noticed some deposits on the iron filings. What would be the colour of the solution and the coating on the iron filing?
Anirudh added zinc granules to the copper sulphate solution.
- What did he observe in this reaction?
- Write chemical equation involved.
Suresh prepared a list of materials required to prepare a temporary mount of leaf peel to show stomata, but his list is not complete. Name any four materials which are not included in this list. Leaf, petridish, coverslip needle, forceps, brush, watch glass safranin, microscope.
What is the function of the seed coat?
A ray of light strikes the rectangular glass slab at an angle of 40°.
- What is the angle of emergence?
- What is the angle of refraction?
A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, in which direction he will have to shift the mirror?
An experiment to trace the path of a ray of light through a rectangular glass slab was performed by four students I, II, III, IV. They reported the following measurements of angle of incidence i, angle of refraction r and angle of emergence e. Which one of the students has performed the experiment correctly?
Non-metallic oxide dissolves in water (H2O) to give acidic solution which turns blue litmus red. Hence, the answer is SO2.
Second member is Propyne C3H4 and third member is Butyne C4H6
- Ciliary muscles,
- eye lens
So, for snakes and frogs, 47 and 40J energy, respectively will be available as per 10% law.
- Substances that do not break down by biological processes are non-biodegradable wastes. Empty paper box of sweets is a biodegradable waste.
Locals are referred to as ‘stakeholders’ because;
- Locals are dependent on forest produce.
- They use different parts of plants like leaves, branches, etc. but never cut down entire tree.
- They graze their cattle in the forest and collect fodder.
- It is a Double displacement reaction.
- It is a reaction in which there is an exchange of ions between the reactants.
- Precipitation reaction.
The beaker turns hot due to production of heat during this reaction. Equation: CaO+H2O → Ca (OH)2 + heat It is a combination reaction.
Steps involved in extraction from the ore are:
- Calcination : Heating the ore strongly in limited amount of oxygen.
ZnCO3 ZnO + CO2
- Reduction : Converting ZnO to Zn with the help of carbon.
ZnO + C → Zn + CO
- A is CH2 = CH2 (ethene)
B is CH3 – CH2 (ethane)
C is CH3 – CH2 – Cl (Chloroethane)
- CH2 = CH2 CH3 – CH3 (hydrogenation)
Type of reaction is addition reaction.
Following are the responses of our body on secretion of hormone by adrenal gland:
- Adrenaline is carried to target organs or heart.
- Heart beats faster thus, supply of more oxygen to muscles takes place.
- Blood supply to digestive system and skin is reduced.
- Breathing rate increases.
- Blood supply is diverted to skeletal muscles.
- Animal body becomes ready to deal with situation.
- A – Ry, B – rY, C- RrYy
D – 9;E – 3 ; F – 3: G-1.
- The objective of the experiment was to study the independent inheritance . of two traits in subsequent generation.
- Human forelimb and bird wings are homologous organs because their structures are same but perform different functions.
- Bird wing and Bat wing are analogous as they perform same functions but have different structures.
- Akshay is suffering from myopia or near-sightedness. A concave lens can be used to correct this defect.
- The teacher displayed presence of mind and pro-activeness, and a considerate nature. Salman displayed the virtue of friendship and caring nature.
- Akshay should thank the teacher and Salman in front of the entire class.
- Live wire,
- neutral wire,
- Earth wire are used in household circuits.
- Earth wire is used as a safety measure. The colour of insulation used is green .
- The metallic body connected to the earth wire keeps its potential equal to that of the earth and if there is any leakage the user does not get any kind of electric shock.
220 V of potential difference is maintained between line wire and neutral wire in domestic electric supply.
The current in each bulb is
Let n be the no. of 100 W bulbs employed at 220 V.
Then by power conservation
Hence no. of bulbs is 1.
• Increase in population;
• greater use of machines due to industrialisation;
• change in lifestyle requiring more and more use of energy;
• limited supply of fossil fuels.
- To focus sun rays into the box for the concentration of solar radiation.
- To produce green house effect or for trapping of sun’s rays.
- For better absorption of solar radiations.
- Bulb A and B do not glow but bulb C glows.
- Glucose and alcohol solutions do not conduct electricity as they do not have ions and electric current is carried through the solution by flow of ions. Dil. HCl contains ions so the flow of ions is responsible for the flow of current.
- After replacement, bulb glows in B as NaOH solution contains ions (Na+ and OH– ions).
- In both test tubes – A and B same products Sodium chloride (NaCl) and Carbon dioxide (CO2) are formed.
- In both the activities gas evolved with the other products formed is same.
- The compound formed is Sodium hydroxide.
- Lime water turns milky due to formation of white ppt. of calcium carbonate. CO2 + Ca(OH)2 → CaCO3 + H2O
- Atomic number was adopted as the basis of classification in Modern Periodic Table.
- It has 7 electrons in the outermost shell.
- A belongs to group 15 and has configuration (2,8,5) or 5 valence electrons. So, A will gain 3 electrons to complete octet, hence is a non-metal.
- Tendency to gain electrons decreases down the group as effective nuclear charge experienced by valence electrons decreases.
- Anion will be formed by element C.
- Gall bladder
- Small intestine
- Salivary amylase is present in saliva. It breaks the starch (complex sugar) into sugar.
2. Aquatic animals obtain oxygen from water, present in dissolved state through their gills. Since dissolved oxygen is fairly low compared to oxygen present in air, the rate of breathing in aquatic organisms is much faster than seen in the terrestrial organisms.
- Stamen and carpel (pistil) contain germ cells.
Self pollination Cross pollination It is the transfer of pollen grains from the anther of the flower to the stigma of the same flower or another flower of the same plant. It is the transfer of pollen grains from the anther of one flower to the stigma of another flower of a different plant of the same species.
- Testes are located outside the body because sperm production, occurring in testes require a 2°C lower temperature than the body temperature.
- During the 28 days of menstrual cycle, ovulation takes place in the middle of the cycle on 14th day. The ovum lives for about one day during which time it is present in the fallopian tube. If copulation occurs during this time, the sperms travel upwards and fertilise the egg in the fallopian tube.
- If fertilisation does not take place during this time, the spongy lining of the uterus breaks down and is shed along with the unfertilised ovum. So copulation in the middle of the menstrual cycle is ideal for fertilisation to take place.
- Reciprocal of focal length expressed in metres is defined as power of a lens.
- P = 5, P = 100 = 20 cm Object at 18 cm, 22 cm and 30 cm will give a magnified image.
- Magnified image at 22 cm and 30 cm is got on a screen.
- Film projectors and telescopes a involve uses of a convex lens.
- R = 5Ω + 8Ω + 12Ω + 25Ω
- V = IR = 0.4 A × 12Ω = 4.8 V (voltmeter reading)
Iron displaces copper from copper sulphate solution to form green solution of iron sulphate and a reddish-brown deposit of copper metal is formed.
- Blue solution becomes colourless.
- Reddish brown deposit is seen on zinc.
- Zn(s) + CuSO4 (aq) → ZnSO4(aq) + Cu(s)
- Scissors or blade
- Filter paper
Seed coat acts as a protective covering for the seed. It protects the seed from environmental stress and injury.
- 40°. Angle of incidence is equal to the angle of emergence.
- Angle of refraction is less than angle of incidence i.e., it should be less than 40°
He will have to shift the mirror towards the screen. This is because the blurred image of an object is obtained only when the separation between the screen and mirror is less than focal length.
Student I has performed the experiment correctly. This is because ∠r < ∠i and ∠i = ∠e.
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