# Class 10 NCERT Solutions

#### NCERT Exemplar problems for Class 10 Science Carbon and its Compounds

Question.1 Draw the electron dot structure of ethyne and also draw its structural formula.

#### NCERT Exemplar Class 10 Science Chapter-3 Metals And Non-Metals

Short Answer Type Questions

1.Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

#### NCERT Exemplar problems for Class 10 Science Chapter 2 Acids, Bases And Salts

Short Answer Type Questions

1.Match the acids given in Column (A) with their correct source given in Column (B).

#### NCERT Exemplar problems for Class 10 Science Chapter 1 Chemical Reactions And Equations

Short Answer Type Questions

1.Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

#### NCERT Exemplar Class 10 Science Chapter-6 Life Processes

Short Answer Type Questions

1.“All plants give out oxygen during day and carbon dioxide during night”. Do you agree with this statement? Give reason.
Answer.Yes, respiration takes place throughout the day and night but photosynthesis takes place only during day time. During day time, as the rate of photosynthesis is more than the rate of respiration, the net result is evolution of oxygen. At night there is no photosynthesis, so they give out carbon dioxide due to respiration.

#### NCERT Exemplar problems for Class 10 Science Periodic Classification of Elements

Question.1 “Hydrogen occupies a unique position in the Modern Periodic Table”. Justify the statement.
Answer. Hydrogen resembles with both group 1 (Alkali metals) as well as group 17 (Halogens), therefore, it occupies a unique position in the Modern Periodic Table.

#### NCERT Exemplar Class 10 Science Chapter-7 Control And Coordination

Short Answer Type Questions

1.Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in the given figure.

#### NCERT Exemplar problems for Class 10 Science How do Organisms Reproduce ?

Question.1 In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.

#### NCERT Exemplar problems for Class 10 Science Chapter 9 Heredity and Evolution

Question 1. Do genetic combination of mothers play a significant role in determining the sex of new born?
Answer. No, mothers have no role in determining the sex of the new born. Mothers have a pair of X chromosome. And all children will inherit an ‘X’ chromosome from their mother regardless of whether they are boys or girls.

#### NCERT Exemplar problems for Class 10 Science Chapter 11 Human Eye and Colourful World

Question 1. A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

#### NCERT Exemplar Class 10 Science Chapter-12 Electricity

Shod Answer Type Questions

1.Three 2 Ω resistors, A, B and C are connected as shown in figure. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors.

#### NCERT Exemplar Class 10 Science Chapter-13 Magnetic Effects of Electric Current

Short Answer Type Questions

1.A magnetic compass needle is placed in the plane of paper near point A as shown in figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

#### NCERT Exemplar Class 10 Science Chapter- 14 Sources of Energy

Short Answer Type Questions

1 Why is there a need to harness non-conventional sources of energy? Give two main reasons.
Answer. There is a need to harness non-conventional sources of energy because:
(i) fossil fuels are limited sources and are depleting fast.
(ii) burning of fossil fuels causes a lot of pollution.

#### NCERT Exemplar problems for Class 10 Science Chapter 15 Our Environment

Question 1. Why is improper disposal of waste a curse to environment?
Answer. Improper disposal of waste is a curse to environment because it pollutes the environment, air, water, soil and cause harmful effects on living organisms.
For example, passage of sewage into water body cause eutrophication, killing of animals and source of water-borne pathogens.

#### NCERT Exemplar problems for Class 10 Science Chapter 16 Management of Natural Resources

1. List two advantages associated with water harvesting at the community level.
Answer. Two advantages of water harvesting at the community level are:

1. Water can be stored during rainy season and can be used when required.
2. Groundwater level increases due to recharging of wells.

#### English Chapter-14: Julius Caesar

5. Answer the following questions by ticking the correct options.

1. When Caesar says "Nor heaven nor earth have been at peace to-night" he sounds _______________
(a) worried
(b) angry
(c) joyous
(d) frightened

#### English Chapter-13: The Dear Departed

4. Given below are the main incidents in the play. They are in a jumbled order. Arrange them in the sequence in which they occur in the play.

#### English Chapter-12: Snake

4. Given below is the summary of the poem Snake in short paragraphs. However they are jumbled. Work in pairs and put the summary into a logical sequence.

(a) After drinking water to satisfaction, the snake raised his head dreamily and flickered his forked tongue and licked his lips. The snake looked around like a God and then slowly proceeded to curve round and move away from the water trough.

#### English Chapter-11: The Rime of Ancient Mariner

6. Answer the following by choosing the right option from those given below:

(a) The Ancient Mariner stopped one of the three wedding guests because…………
i. he wanted to attend the wedding with him
ii. he wanted him to sit with him
iii. he wanted him to listen to his story
iv. he wanted to stop him from going to the wedding

#### English Chapter-10: Ozymandias

4. Answer the following questions by ticking the correct options.

(a) The poem is set in ____________________________________________
i. the wilderness
ii. an ancient land
iii. a palace
iv. a desert

#### English Chapter-09: Not Marble nor the Gilded Monuments (Sonnet 55)

6. On the basis of your understanding of Shakespeare's sonnet, answer the following questions by ticking the correct options.

(a) The rich and powerful got ornate monuments made in order to _______________
i. show off their wealth
ii. display their power
iii. show their artistic talent
iv. be remembered till posterity

#### English Chapter-08: Mirror

3. On the basis of your understanding of the poem, answer the following questions by ticking the correct choice

(a) When the mirror is being described as being 'unmisted by love or dislike' we understand that the mirror is
i. not misted
ii. not prejudiced
iii. has four angles
iv. silver in colour

#### English Chapter-07: The Frog and the Nightingale

5. The following is a summary of the poem but it is jumbled up. Write out the events in their correct order to form a continuous paragraph.

#### English Chapter-06: Virtually True

Exercise

1. According to the newspaper, what had happened to Sebastian Shultz?

Sebastian Shultz was badly injured in a car accident. His condition was described by doctors as critical but stable. In spite of doctors’ efforts Sebastian could not regain consciousness. He went into coma.

#### English Chapter-05: Patol Babu, Film Star

3. Answer the following questions briefly

(a) What was the news that Nishikanto Ghosh gave Patol Babu?

Nishikanto Babu told Patol Babu that his brother-in law, who was in the film business, was looking for an actor for a film they were shooting. The character he described reminded Nishikanto Babu of Patol Babu so he gave him his address and asked him to get in touch with him.

#### English Chapter-04: A Shady Plot

4. Based on your reading of the story above, answer the following questions by ticking the correct options.

1. The narrator earns his living by ………………………….
(a) writing ghost stories
(b) working as a reader for a magazine
(c) working as a stenographer
(d) working as an accountant in a lumber company

#### English Chapter-03: The Letter

4. Answer the following questions by ticking the correct options:

(a) Ali's walking to the Post Office daily even in biting cold weather shows his ________.
(i) courage
(ii) optimism
(iii) foolishness
(iv) strength of will

#### English Chapter-01: Two Gentlemen of Verona

4. Based on reading of the story answer the following questions by ticking the correct options.

1. The driver did not approve of the narrator buying fruit from the two boys because
(a) the boys were untidy and poorly dressed
(b) the strawberries were not fresh
(c) they were asking for a heavy price
(d) the driver did not approve of small boys who worked

#### English Chapter-02: Mrs Packletide's Tiger

It was Mrs. Packletide's pleasure and intention that she should shoot a tiger …. The compelling motive ….was the fact that Loona Bimberton had recently …… personally procured tiger-skin and a heavy harvest of Press photographs could successfully counter that sort of thing.

#### Science Chapter-05: Periodic Classification of Elements

1) Dobereiner’s triads do not exist in Newland’s Octaves. Is the above statement true? If true,Justify.

Ans.

False. Dobereiner’s triads do exist in Newland’s Octaves. For example, the elements
Lithium(Li), Potassium(K) and Sodium(Na) constitute a Dobereiner’s Triad but are also found in the second column of Newland’s Octaves.

#### Science Chapter-14: Sources of Energy

Question 1

What is a good source of energy?

#### Science Chapter-10: Light - Reflection and Refraction

Q1. What do you mean by principal focus?

Ans: All incident light rays which are passing parallel to the principal axis of the concave mirror meet at a specific point after reflecting from the concave mirror. That specific point is known as the principal focus of a concave mirror.

#### Science Chapter-04: Carbon and its Compounds

Question 1:

Provide the electron dot structure for CO2:

#### Science Chapter-15: Our Environment

Short Question

Q.1. Why is the disposal of improper waste a curse to the environment?

#### Science Chapter-07: Control and Coordination

Q1: Name the parts (i),(ii),(iii),(iv),(v)and (vi) as shown in the figure .

#### Science Chapter-08: How do Organisms Reproduce?

1-What is the primary importance of DNA copying in reproduction?

#### Science Chapter-09: Heredity and Evolution

Q1. If a trait X exists in 10% of a population of an asexually reproducing species and trait Y exists in 60% of the same population, which trait would have come earlier?

#### Science Chapter-06: Life Processes

SHORT ANSWER TYPE QUESTION

Q1: Do you agree, “The plants at night give out carbon dioxide and oxygen during day”? Give reason.

#### Science Chapter-13: Magnetic Effects of Electric Current

Question 1:

What is the reason behind the compass needle being deflected when it is brought close to the bar magnet?

#### Science Chapter-11: Human Eye and Colourful World

Short Question

(Question 1) what advice will a doctor give to a student sitting at the back of the classroom who cannot read clearly the letters written on the blackboard draw ray diagram for the correction of this defect

#### Science Chapter-12: Electricity

Q1.Three 3 ? resistors, X, Y and Z are connected as shown in the figure. The maximum power each of them can withstand is 27 W. Find the maximum current that can flow through the three resistors.

#### Science Chapter-16: Management of Natural Resources

1.What changes can you make in your habits to become more environment-friendly?

The concept of Three R’s Should be followed in our home if we are want to be environment friendly.

#### Science Chapter-01: Chemical Reactions and Equations

Questions:

Q1) Why should a Magnesium ribbon be cleaned before burning in air?

#### Science Chapter-02: Acids, Bases and Salts

Question 1:

Consider this situation:

You are given three test tubes. The three test tubes contain distilled water, acidic solution and basic solution respectively. There is only red litmus paper available in order to identify what is there in each test tube. How will you find out what is in each of the test tubes?

#### Science Chapter-03: Metals and Non-metals

Question 1:

Define amphoteric oxides. Give two examples.

#### Maths Chapter-02: Polynomials

DEGREE OF A POLYNOMIAL:-

If p(x) is a polynomial in x, the highest power of x in p(x) is called the degree of polynomial p(x).

And expressions like:- $$\sqrt{x^{2}}+2\;, \frac{1}{x-1}$$etc., are not polynomials.

#### Maths Chapter-07: Coordinate Geometry

1. If the point A (x , y) is equidistant from B (4 , 2) and C (-2 , 4). Find the relation between x and y.

#### Maths Chapter-09: Some Applications of Trigonometry

1. If sun’s elevation is 45°. Find the length of the shadow of a pole of height 8 m.

#### Maths Chapter-01: Real Numbers

QUESTION-1

Use Euclid’s division algorithm to find the HCF of:

i)135 and 225

ii)196 and 38220

iii)867 and 225

#### Maths Chapter-15: Probability

1-Two dice are thrown simultaneously. What is the probability that the sum of the numbers is

a) 8?

b) 2?

c) Prime number?