These Sample papers are part of CBSE Sample Papers for Class 10 Science. Here we have given CBSE Sample Papers for Class 10 Science Paper 12.
CBSE Sample Papers for Class 10 Science Paper 13
|Sample Paper Set||Paper 13|
|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 13 of Solved CBSE Sample Paper for Class 10 Science is given below with free PDF download solutions.
Time Allowed: 3 hours
Max. Marks: 80
- 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.
Which of the following shows an acidic nature? HCl solution or dry HCl gas
Write the molecular formula of the 2nd and the 3rd member of the homologous series whose first member is ethane.
- The sky appears dark to passengers flying in space. Why ?
- Which component of white light is least scattered by fog or smoke.
- Pick the biodegradable substances from the following: Cotton, rubber, leather, radioactive material.
- Select the abiotic components of the environment from the following: Light, fungus, monkey, humidity.
Which type of people are benefitted from the development of different resources? Why do we need to use the resources carefully?
When is a chemical reaction considered double displacement reaction? Explain giving example. State a difference between displacement and double displacement reaction.
Name two metals which are purified by electrolytic refining. Mention the anode, cathode and the electrolyte used in the refining process. At which electrode would the pure metal be deposited ?
Write balanced chemical equation for the following reactions:
- When copper is heated in air.
- When aluminium is heated in air.
- Aluminium oxide reacts with sodium hydroxide.
Differentiate between combustion and oxidation reactions of ethanol.
- Draw the structure of a neuron and label the nucleus and cell body.
- Name the part of a neuron –
- where the information is acquired.
- through which information travels as an electric impulse.
- Identify the endocrine glands A, B, C, D in the given diagram.
- List the functions of parts D and F
Trace the F, generation formed by crossing two plants with separate traits for shape and seed colour-round green (RRyy) and wrinkled yellow(rrYY). Mention the characteristic exhibited by it.
- Name two factors that could lead to the rise of new species.
- Why are the wings of birds and bats considered analogous organs?
Millions of people of the developing countries of world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission how would you contribute in this noble cause?
- State the objective of organising such campaigns.
- List two arguments ‘which you would give to motivate the people to donate their eyes after death.
- List two values which are developed in the persons who actively participate and contribute in such programmes.
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.
- Two circular coils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, will some current be induced in coil Q? Give reason for your answer and name the phenomenon involved.
- What happens if coil P is moved away from Q?
- State any two methods of inducing current in a coil.
What is meant by wind energy farm? Write one of its practical applications. Give any two limitations of using wind energy.
What are the environmental consequences of the increasing demand fo energy? What steps would you suggest to reduce energy consumption?
- Rahul has been stung by a honey-bee and is in great pain. What could be the reason for this burning pain ? State the type of chemical compound that can be applied on the affected area to give relief to Rahul.
- Write the name and formula of each of the following :
- An acidic salt
- A basic salt
- A neutral salt
- Given below is a list of elements along with their atomic numbers in parenthesis.
A(6), B(8), C(10), D(12), E(14), F(16)
Select the element which has :
- two shells both of which are completely filled with electrons.
- the electronic configuration 2, 8, 2.
- a total of three shells, with four electrons in its valence shell.
- a total of two shells, with four electrons in its valence shell.
- The position of three elements A, B and C in the modern periodic table is shown below:
Giving reasons, explain the following :
- Element A is a metal.
- Atom of element C has a larger size than atom of element B.
- Element B has a valency of 2.
- Draw a sectional view of the heart and label
- Blood vessel which carries deoxygenated blood from heart to lungs.
- Blood vessels which brings oxygenated blood from lungs to the heart.
- Chamber of the heart which receives deoxygenated blood.
- Largest blood vessel.
- Why do arteries have thick elastic walls?
- List two advantages of sexual reproduction over asexual reproduction.
- Name the type of asexual reproduction seen in :
- Draw a diagram of Rhizopus showing the location of:
- Rhizoidal hyphae.
- How will an organism be benefited if it reproduces through spores?
- 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?
- The refractive index of diamond is 2.42. What is the meaning of this statement?
- Redraw the diagram given below in your answer book and complete the path of ray.
- What is the difference between virtual images produced by concave, plane and convex mirrors ?
- What does the negative sign in the value of magnification produced by a mirror indicates about a image ?
- Name and state the law which gives the relation between potential difference and current.
- Draw circuit diagram to experimentally verify this law.
- Draw V – I graph for a nichrome wire.
- A nichrom wire of 42 resistance is doubled on itself. Calculate the new resistance of the wire.
- Define the unit of current.
- Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Select combination reaction and double displacement reaction from the statement given below:
- Addition of water to quick lime.
- Heating of ferrous sulphate crystals.
- Putting an iron nail in copper sulphate solution.
- Mixing solutions of sodium sulphate and barium chloride. Also, mention the time of reaction to occur in each case
Four different test tubes were filled with aluminium sulphate solution. Different metals were introduced into these test tubes in following manner. What can be inferred?
|Test Tubes||Metal Introduced||Observation|
Which light influences the opening of stomata?
Name the type of asex’ual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Draw the initial and the final stages of this type of reproduction. State the event with which this reproduction starts.
How are monocots different from dicots?
A student wanted to pick up a concave mirror from three mirrors A, B, C lying on a table to find its focal length. He looks into mirror A, he finds his image enlarged and erect. When he looks in mirror B, his image is diminished and erect. When he looks in mirror C, his image is erect and of same size. Find the correct identification of A, B, C in respective order.
A student did the experiment to find the equivalent resistance of two given resistors, R, and R, first when they are connected in series and next when they are connected in parallel. The two values of the equivalent resistance obtained by him were Rs and Rp respectively. Compare Rs and Rp.
HCl solution gives hydrogen ion (H+) and shows an acidic nature.
- In space there is absence of atmosphere, so no scattering of light. Hence sky appears dark.
- red colour is scattered least by fog or smoke.
(i) Cotton, leather
(ii) Light, humidity
All people, not only rich and powerful people are benefitted from the development of different resources. We need to use resources carefully because:
- they are not unlimited.
- the demand is increasing due to increase in human population rate.
- for sustainable development. (Any two)
A reaction is considered double displacement reaction if during the chemical reaction an exchange of ions takes place between two ionic substances.
For example : BaCl2 + Na2SO4 → BaSO4 + 2NaCl
In a displacement reaction, a more reactive element displaces or removes another element from its compound whereas in a double displacement reaction the compounds react by exchanging their ions and form two new compounds.
Copper, zinc, tin, nickel, silver, gold and purified by electrolytic refining. To conduct the process we take impure metal as anode, pure metal as cathode and a salt solution of the metal as electrolyte. Pure metal will be deposited on the cathode.
- 2Cu + O2 + 2CuO
- 4Al + 3O2 → 2Al2O3
- A1203 + 2NaOH → 2NaAlO2 + H2O
Complete burning of ethanol in the presence of excess of oxygen to give carbon dioxide and water is called combustion. CH3CH2OH + 302 → 2C02 + 3H2O
Addition of oxygen to ethanol in the presence of oxidising agents to give ethanoic acid is called oxidation.
- Dendron or Dendrite tip of a nerve cell.
- The information travels as an electric impulse to through axon.
- A – Pituitary
B – Thyroid
C – Adrenal
D – Pancreas
- D (Pancreas) : It secretes insulin which control amount of sugar in blood. F is Testes: It secretes testosterone which controls sperm production and secondary sexual characters.
Parents: RRyy × rrYY
Gametes Ry × rY
F1 — RrYy
The characteristic exhibited by plant is Round yellow seeds.
- Two factors that lead to rise of new species or genetic drift and natural selection.
- Wings of bats have skin folds between elongated fingers whereas wings of birds have feathery covering all along the arm. These organs do not have a common structure and origin but they are used commonly for flight i.e. for same function. So these organs are called analogous organ.
- These campaigns’ are organised to make people aware and realise their duties towards society.
- Following arguments can be given:
- One person can give sight to two people.
- Our eyes can live even after our death.
- Values : Concern for others, Responsible behavior
Situation in which live and neutral wire come in direct contact, abruptly increasing the current in the circuit is called short-circuiting. Factors that can lead to short circuiting are: Insulation of wire is damaged or there is some fault in appliance. Device which acts as a safety measure for it is called a fuse or MCB. Electric fuse is an application of Joule’s heating. If there is a current larger than the specified value the temperature of fuse wire increase and it melts to break the electric circuit and stop the flow of unduly high electric current.
- When coil P is moved towards Q, current will be induced in coil Q. This is because on moving P the magnetic field associated with Q increases and so a current is induced. The phenomenon is called electromagnetic induction.
- If P is moved away from Q, the field associated with Q will decrease and a current will be induced but in the opposite direction.
- Current can be induced in a coil by
- moving a magnet towards or away from the coil
- moving a coil towards or away from a magnet
- rotating a coil within a magnetic field.
A wind energy farm consists of a number of wind mills erected over a large area such that energy output of each mill in a farm is coupled together. A wind energy farm can generate electricity on a commercial scale.
- The wind speed should be higher than 15 km/h.
- Installation cost is high.
- It cannot be used in the absence of wind. (Any two)
Following are the environmental consequences:
- Burning of fossil fuels to meet the increasing demand for energy causes air pollution.
- Construction of dams on rivers to generate hydroelectricity destroys large ecosystems which get submerged under water in the dams. Further, large amounts of methane (which is a greenhouse gas) is produced when submerged vegetation rots under anaerobic conditions.
In order to reduce energy consumption:
- Fossil fuels should be used with care and caution to derive maximum benefit out of them.
- Fuel saving devices such as pressure cookers, etc., should be used.
- Efficiency of energy sources should be maintained by getting them regularly serviced.
- And last of all, we should be economical in our energy consumption as “energy saved is energy produced”.
- Bee-sting injects methanoic acid which causes pain. A mild base like baking soda can be applied on the affected area to give relief.
- Ammonium chloride, NH4CI
- Sodium carbonate, Na2C03
- Sodium chloride, NaCl
- C as electronic configuration of C is 2,8
- E; electronic configuration of E is 2, 8, 4
- A; electronic configuration of A is 2, 8, 4
- Element A being in column 1 has one electron in the outermost shell. In order to gain stability it has a tendency to lose electron, thus it is a metal.
- Atomic size increases as we move down in a group in the periodic table. It decreases as we move from left to right in a period. Keeping this in mind, element C has a larger size than B.
- Element B has two electrons in the valence shell. It loses two electrons to achieve the nearest inert gas configuration. Therefore, element B has a valency of 2.
- Pulmonary artery
- Pulmonary vein
- Right atrium
- As arteries are the first vessels that the heart pumps blood through, they experience the highest pressure, so they have thick elastic wall.
- Sexual reproduction promotes diversity of characters in the offsprings
- It results in new combination of genes
- Harmful traits are often kept suppressed because of reshuffling of gene pairs
- It plays an important role in the origin of new species. (any two)
- Multiple fission
- Organisms are benefited through following ways:
- It is a simpler and faster mode of reproduction
- spores being small and light get easily dispersed through wind, water and animals
- spores bear thick resistant covering to enable them to survive even in unfavourable conditions. (Any two)
- Stamen and carpel (pistil)
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 is because for sperm production, occurring in testes require a 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 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, 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.
- When egg is not fertilised, the thick lining of the uterus breaks and comes out through the vagina as blood and mucous.
- This means that the ratio of speed of light in air and speed of light in diamond is 2.42.
- Virtual image produced by concave mirror is magnified, that produced by plane mirror is of the same size and the virtual image produced by convex mirror is diminished.
- The negative value in magnification indicates that the image is real.
- Ohm’s law: The electric current flowing through a metallic conductor is directly proportional to the potential difference across its ends, provided its temperature remains the same .
- We are given, R = 4 12 When a wire is doubled on it, its length would become half and area of cross-section would be doubled. That is, a wire of length 1 becomes
and area of cross-section 2A. We know that
The new esistance of the wire is 1Ω
(i) The SI unit of electric current is ampere (A). When I coulomb of electric charge flows through any cross-section of a conductor in 1 second, the electric current flowing through it is said to be 1 ampere.
- (Immediately) — Combination reaction
- (About 5-15 minutes) — Decomposition reaction
- (More than 15 minutes) — Displacement reaction
- (Immediately) — Double displacement reaction
It can be inferred that Al is more reactive than Zn, Fe and Cu. This is because when Zn, Fe, Cu are introduced in aluminium sulphate solution, no change is observed as none of the metals displaces aluminium from its solution.
Opening of stomata is influenced more by blue light because oxygen concentration is maximum in blue light.
The type of asexual reproduction is binary fission.
This reproduction starts with elongation of nucleus.
Monocots have single cotyledons whereas dicots have double cotyledons. · Monocots have parallel leaf venation whereas dicots have reticulate leaf venation.
- Mirror A is concave.. When the face is placed close to the concave mirror, it produces enlarged and erect image.
- Mirror B is convex. When the object is at a finite distance from the mirror the image formed by the convex mirror is diminished, virtual and erect.
- Mirror C is plane. Image formed by a plane mirror is always virtual and erect. The size of the image is equal to that of the object.
In series, the equivalent resistance Rs = R1 + R2
In parallel, the equivalent resistance
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