Assignments

Class 10

1. Hindi

2. Mathematics

3. Science

4. Social Science

MATHEMATICS ASSIGNMENT – I (2017-18)

Class – X

(Ch –Real numbers, Polynomials, Pairs of linear equations in two variables)

Q1 State Fundamental theorem of Arithmetic. Using it, find the HCF of 1560, 1755 and

2925.

Q2 Prove that 1 + is irrational.

Q3 Show that 12n cannot end with digit 0 for any natural number n.

Q4 Find the largest number that divides 626, 3127 and 15628 and leaves remainders 1, 2

and 3 respectively.

Q5 If the HCF of 408 and 1032 is expressible in the form 1032m – 408x5, find m.

Q6 Given that (x - √5) is a factor of the cubic polynomial x3 - 3√5x

2 + 13x - 3√5, find all

the zeroes of the polynomial.

Q7 If α, β are the zeros of the quadratic polynomial P(x) = x2 – 5x + 6, find a quadratic

polynomial whose roots are

Q8 Find the value of k such that 3x2 + 2kx + x – k – 5 has the sum of the zeros as half

their product.

Q9 If (-5) is one of the zeros of the 2x2 + px – 15 and a quadratic polynomial

p(x2 + x) + k has two equal zeroes. Find k.

Q10 Find the value of k for which the following pair of linear equations have no solution:

3x + y = 1, (2k - 1)x + (k - 1)y = 2k + 1.

Q11 Show that the system of equations 3x – 5y = 7, 6x – 10y = 14 is consistent.

Q12 Solve: = , = , x+y ≠ 0, 2x – y ≠ 0

Q13 Solve by using substitution, elimination and cross multiplication method:

a) x + 2y = -1, 2x + 3y = 12 b) 2x + 3y = 9, 3x + 4y = 5

Q14 Two men start from two points P and Q, 8km apart and walk towards each other. They

meet in 80 minutes. If they walk in the same direction, they meet in 2 hours. Find their

speeds.

SCIENCE ASSIGNMENT - I (2017-18)

CHEMISTRY

CLASS - X

CHAPTER - ACIDS, BASESAND SALTS

Q1. What is the difference between a base and an alkali? 1

Q2. Two solution have pH equal to 3 and 5 respectively. Which one is more acidic and

why? 1

Q3. Why dull surface of copper starts shining when we rub it with lemon? 1

Q4. Why is solution of bleaching powder milky? 1

Q5. Why do silver articles become black after some time when exposed to air? 1

Q6. Identify the acid and base whose combination forms the common salt that you use in

your food. 2

(a) Write its formula and chemical name of this salt

(b) Name the source from where it is obtained

(c) Mention its colour and reason due to which it has this colour

(d) What happens when electricity is passed through brine. Write the chemical

equation for it.

Q7. When a metal X is treated with cold water, it gives a base y with molecular formula

XOH and liberates a gas Z which easily catches fire. Identify X, Y and Z and also

write the reaction involved. 2

Q8. A compound which is prepared from gypsum has the property of hardening when

mixed with proper quantity of water. 3

(a) Identify the compound.

(b) Write the chemical equation for its preparation.

(c) Mention one important use of this compound.

Q9. How is baking powder obtained from common salt? Explain its use (a) as medicine (b)

in food and drinks (c) fire extinguisher. 3

Q10. When electricity is passed through a common salt solution, sodium hydroxide is

produced along with the liberation of two gases ‘X’ and ‘Y’. ‘X’ burns with pop sound

whereas ‘Y’ is used for disinfecting drinking water. 3

(a) Identify X and Y.

(b) Give the chemical equation for the above reaction.

(c) State the reaction of Y with dry slaked lime.

SCIENCE ASSIGNMENT – I (2017-18)

CLASS - X

PHYSICS

TOPIC - ELECTRICITY

SCIENCE ASSIGNMENT – II (2017-18)

CLASS - X

PHYSICS

Assignment -3

Class X (Physics)

Chapter –Sources of Energy

Q1 Name three gadgets using soalr energy.

Q2 Which of the following are not derived from fossil fuils ?

Coal, cake, petrol, CNG, and LPG

Q3 Justfy in one sentence that hydropower is a renewable source of energy.

Q4 Which is the process responsible for immense energy of sun? Also give its two

characteristics.

Q5 How has traditional use of wind and water energy been modified for our convenience?

Q6 How is the increase in demand for energy affecting our environment adversly?

Mention three points.

Q7 Why many thermal power plants setup near coal and oil fields? Explain.

Q8 Discuss two limitations for each,extracting of energy from (i) winds (ii) tides.

Q9 List any four types of alternate energy source .What is their ultimate source?

Q10 Firewood is our conentional fuel . List any four reasons for replacing it by the

alternate sources of energy?

Q11 in a village ,despite enough availability of fire wood ,coal and kerosene oil,most of the

famalies use bio gas plants for cooking purpose.

(a) What is bio gas plant ?Describe with a neat and labelled diagram.

(b) Why do we prefer bio gas plant .Give at least three points .

Q12 A student wants to design a car which can run on any alternative source of energy.

Suggest any two sources of energy and give its advantage .

SCIENCE ASSIGNMENT – I (2017-18)

CLASS - X

BIOLOGY

TOPIC: LIFE PROCESSES

Q1. Why do herbivores have longer, small intestine than carnivores? (1 marks)

Q2. Write the balanced chemical equation for the process of photosynthesis. How

photosynthesis occurs in desert plants? (1 mark)

Q3. In single celled organisms diffusion is sufficient to meet all their requirements of food,

exchange of gases or removal of wastes but it is not in case of multicellular organisms.

Explain the reason for this difference. (2 marks)

Q4. Draw a diagram of human excretory system and label kidneys, ureters on it.

(2 marks)

Q7. Explain the process of nutrition in Amoeba. (2 marks)

Q10. How do guard cells regulate the opening and closing of the stomata? (2 marks)

Q6. Explain transport and exchange of gases in humans. (3 marks)

Q1. State the role of the following in human digestive system: (3 marks)

(a) Digestive enzymes

(b) Hydrochloric acid

( c) Villi

Q8. List three kinds of blood vessels of human circulatory system and write their functions

in tabular form. (3 marks)

Q9. Draw a diagram of human respiratory system and label the following: (3marks)

(a) Part where air is filtered by fine hairs and mucus

(b) Part which terminates in balloon like structures

(c) Part which separates chest cavity from abdominal cavity

(d) Part where exchange of gases takes place.

CLASS X

BIOLOGY ASSIGNMENT 2: CONTROL AND CO-ORDINATION

Q1. Why is it advised to use iodised salt in our diet? (1)

Q2. State how concentration of auxin stimulates the cell to grow longer on the side of the shoot which is away from light? (2)

Q3. Explain the need of chemical communication in multicellular organism. (2)

Q4. Give an example of a plant hormone that promotes its growth. Where is it synthesized? (2)

Q5. Name the hormones that are released in human males and females when they reach puberty? (2)

Q6. Name the gland associated with brain. Which problem is caused due to the deficiency of the hormone released by this gland? (2)

Q7. Draw a neat diagram of human brain and label on it the following parts:

a) Midbrain b) Pituitary gland (2)

Q8. Write one example each of the following tropic movements:

a) Positive phototropism b) Negative phototropism c) Positive geotropism d) Negative geotropism

e) Hydrotropism f) Chemotropism (3)

Q9. What is synapse? In a neuron cell how is an electrical impulse created and what is the role of synapse in this context? (3)

Q10. State the structural and the functional unit of the nervous system. Draw its neat labelled diagram and write two functions. (3)

CLASS X

BIOLOGY ASSIGNMENT 3 – REPRODUCTION

Q1. Name a unicellular organism which reproduces by multiple fission. (1)

Q2. What is meant by fragmentation in organisms? Name a multicellular organism which

reproduces by this method. (2)

Q3. How does regeneration take place? Why is this process not possible in all animals?

(2) Q4. In our country the legally prescribed minimum age for marriage is 18 years forfemales

and 21 years for males. Why is it essential to fix the minimum age for marriage? Give

three reasons to justify your answer. List three methods forpreventing unwanted

pregnancy. (3)

Q5. List the changes that are occurring during menstruation? (2)

Q6. List in tabular form two distinguishing features between a sperm and an ovum.

(2) Q7. Identify ‘A’, ‘B’, ‘C’ and ‘D’ in the given diagram.

(2)

Q8. What is meant by pollination? Explain its significance. Explain the process of

fertilization in flowers. (3)

Q9. Draw neat diagram of human female reproductive system. Label oviduct and uteruson

it. State the role of placenta. (3)

Q10. Write the functions of each of the following parts in flowering plants:

(i) Pistil

(ii) Stamen (2)

CLASS X

BIOLOGY ASSIGNMENT 4: HEREDITY AND EVOLUTION

Q1. Select a set of homologous organs from the following:

(a) Forelimb of frog, bird and lizard

(b) Wings of birds and wings of bats

(c) Wings of bats and wings of butterflies

(d) Spines of cactus and thorns of Bougainvillea. (1)

Q2. What is the total number of chromosomes in a human maleand a human female?

Write the type and number of sexchromosomes in each case.

(2)

Q3. How do Mendel’s experiments show that the traits are inherited independently?

(2) Q4. How the sex of child is determined in humans? (2)

Q5. What are the different ways in which individuals with a particular trait may increase in

population? (2)

Q6. Differentiate between inherited and acquired traits by giving one example of

each.Give reason why the traits acquired during the life time of an individual are not

inherited? (3)

Q7. What is speciation? State any two factors which could lead to speciation.

(3)

Q8. If we cross-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant,

we will get plants of F1 generation. If we now self-cross the pea plant of F1

generation, we obtain pea plants of F2 generation.

(a) What do the plants of F1 generation look like?

(b) State the ratio of tall plants to dwarf plants in F2 generation.

(c) State the type of plants not found in F1 generation but appeared in F2

generation. Write the reason for the same. (3)

Q9. What are homologous and analogous organs? How do theyprovide evidences in favour

of evolution? (3)

Q10. What are fossils? How are they formed? Explain two roles of fossils in

tracingevolutionary relationships. (3)

SCIENCE ASSIGNMENT – II (2017-18)

CHEMISTRY

CLASS – X

CHAPTER - METALS AND NON-METALS

Q1. Why ionic compounds have high melting point? 1

Q2. Aluminium is highly reactive metal, still it is used to make utensils for cooking give

reason. 1

Q3. NaCℓ is not a conductor of electricity in solid state whereas it does conduct electricity

in aqueous solution as well as in molten state. Explain. 1

Q4. Why should we not throw small pieces of sodium into sink in a laboratory? 1

Q5. Draw electron dot structures of CaO, MgO and S8. Also write the ions present in these

compounds? 3

Q6. (a) What are amphoteric oxides? Give any two examples. 3

(b) Why is that non-metal do not displace hydrogen from dilute acids?

Q7. You have to extract metal M from its enriched sulphide ore. If M is in the middle of

the reactivity series, write various steps used in extracting this metal. 3

Q8. Metal E has electronic configuration 2, 8, 3 and occurs in earth’s crust as its oxide,

E2O3. It is more reactive than zinc. Answer the following: 3

(a) What is the name of the metal E?

(b) Name the ore from which metal is extracted.

(c) Write two important uses of E.

Q9. Define the terms (a) minerals (b) ore (c) gangue. 3

Q10. A student took sulphur powder on a spatula and heated it. He collected the gas evolved

by inverting a test tube over it . 3

(a) What will be the action of a gas on (i) dry litmus paper? (ii) moist litmus paper?

(b) Write a balanced chemical equation for the reaction taking place.

SCIENCE ASSIGNMENT – III (2017-18)

CHEMISTRY

CLASS – X

CHAPTER - CARBON AND ITS COMPOUNDS

Q1. Distinguish between saturated hydrocarbon and unsaturated hydrocarbons with the

help of combustion process. 1

Q2. How will you test that the given water is hard water or not? 1

Q3. Does soap create water pollution? State your answer with reasons. 1

Q4. How many electrons are present in carbon atom? How does carbon attain stable

electronic configuration and why? 2

Q5. Mention any two points to differentiate between oxidation and combustion. Give one

example of each. 2

Q6. Write equations for the reaction of ethanol with: 3

(a) Sodium metal (b) Conc.H2SO4 (c) ethanoic acid in presence of conc.H2SO4.

Q7. Write the name and structure of parent alkane of methanol. What happens when

methanol is heated with alkaline KMnO4 solution? Name the main product obtained

by the reaction of methanol and methanoic acid in presence of conc.H2SO4. 3

Q8. Write equation for the following chemical reaction: 3

(a) Methane reacts with chlorine in presence of sunlight.

(b) Ethene reacts with water in presence of dil.sulphuric acid.

(c) Ethanoic acid reacts with sodium hydroxide.

Q9. Write the electron dot structure of chloroethane. Also, write the formula of its next

homologue and give its IUPAC name. 3

Q10. Write the IUPAC name: 3

(i) CH3CH2CH2OH (iii) CH3CH2COOH (v) CH3COCH2CH3

(ii) CH3CH2CH2CH2CH2CHO (iv) CH3CH(Cℓ)CH2CH3 (vi)CH2=CHCH2CH3 .

SOCIAL SCIENCE ASSIGNMENT – I (2017-18)

CLASS – X HISTORY

CHAPTER: NATIONALISM IN INDIA

General Instructions:

1. Question numbers from 1 to4 are to be answered in 40 to 60 words.

2. Question numbers from 5 to 10 are to be answered in 100 to 120 words.

Q1. Why did Kheda farmers protest against Britishers?

Q2. Why did Mahatma Gandhi join Khilafat issue?

Q3. What did freedom mean to plantation workers in Assam?

Q4. What was Inland Emigration Act of 1859?

Q5. How did the Muslims respond to the Civil Disobedience Movement?

Q6. Why was Poona Pact signed?

Q7. Discuss the various stages of the Non Cooperation Movement launched by Mahatma

Gandhi .

Q8. What action did the British government take after the famous Dandi March?

Q9. What type of flag was designed during the Swadeshi Movement in Bengal? Explain its

main features.

Q10. How did large scale participation of women in the Civil Disobedience Movement

become an important feature?

SOCIAL SCIENCE ASSIGNMENT – II (2017-18)

CLASS – X

GEOGRAPHY

CHAPTER: MINERALS AND ENERGY RESOURCES

General Instructions:

1. Question numbers from 1 to4 are to be answered in 40 to 60 words.

2. Question numbers from 5 to 10 are to be answered in 100 to 120 words.

Q1. What are placer deposits?

Q2. What are ‘veins’ and ‘lodes’?

Q3. What is the importance of ferrous minerals?

Q4. What is Rat-hole mining?

Q5. What is Biogas? Where in India are biogas plants set up and why?

Q6. What is the need of using non-conventional sources of energy?

Q7. Why do you think that solar energy has a bright future in India?

Q8. Discuss the hazards of mining on the life of miners and on environment.

Q9. ‘Natural gas is an important source of clean energy.’ Support the statement with

examples.

Q10. In what forms do minerals occur?