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# Board Paper of Class 10 2013 Science - Solutions

(PART – A)
General Instructions:
(i) There are 50 objective type (MCQ) questions is Part - A and all the questions are compulsory.
(ii) The questions are serially numbered from 1 to 50 and each carries 1 mark.
(iii) Read each question, carefully, select proper alternative and answer in the O.M.R. sheet.
(iv) The OMR sheet is given for answering the questions. The answer of each question is represented by (A) , (B) , (C) , (D) Darken the circle of the correct answer with ball-pen.
(v) Set No. Of Question Paper printed on the upper-most right side of the Question Paper is to be written in the column provided in the OMR sheet.

(PART – B)
General Instructions:
1) Write in clear hand writing.
2) There are four sections in part –B of the question paper and total 1 to 18 questions are there.
3) All the questions are compulsory. Internal options are given.
4) The numbers at right side represent the marks of the questions.
5) Start new section on new page.
6) Maintain sequence.

SECTION-A
Questions from 51 to 55 are short answer type of questions. Write an answer to each using maximum 30 words. Each question carries 2 marks.
SECTION-B
Questions from 56 to 60 are short answer type of questions. Use maximum 30 words to answer them. Each question carries 2 marks.
SECTION-C
Questions from 61 to 65 are short answer type of question. Write an answer to each using maximum 50 words. Each question carries 3 marks.
SECTION-D
Question numbers 66 to 68 are to be answered in detail using nearly 100 words. Each question carries 5 marks.
• Question 1
What is the maximum capacity of a normal human eye to see small objects?

(a) 10,000 micrometer

(b) 10 micrometer

(c) 100 micrometer

(d) 1000 micrometer VIEW SOLUTION
• Question 2
What is the diameter of a hydrogen atom in nm?

(a) 1

(b) 10

(c) 0.1

(d) 0.01 VIEW SOLUTION
• Question 3
Find the focal length of a convex lens, if its power is +2.0 D.

(a) 0.5 m

(b) – 0.5 m

(c) 1 m

(d) – 1 m VIEW SOLUTION
• Question 4
Which colour of light deviates the maximum in the dispersion of white light by the prism?

(a) Violet

(b) Blue

(c) Green

(d) Red VIEW SOLUTION
• Question 5
A point object emits rays in all directions.
Consider one ray that the object emits which is parallel to the principal axis of a concave mirror as shown in the following figure. One of the points required to draw the reflected ray is the point of incidence itself which is labelled in the figure.

Select the point in the figure given here through which the reflected ray passes.

(a) P

(b) C

(c) F

(d) A VIEW SOLUTION
• Question 6
What is the time difference between actual sunset and apparent sunset?

(a) 2 seconds

(b) 20 seconds

(c) 2 minutes

(d) 20 minutes VIEW SOLUTION
• Question 7
Bi-focal lenses consist of both concave and convex lenses. Glasses using bi-focal lenses are needed by people who have_______ P. nearsightedness Q. farsightedness R. night blindness

(a) Only P

(b) Only Q

(c) Only R

(d) Both P and Q VIEW SOLUTION
• Question 8
What is the main principle involved in Voltaic cell?

(a) Conversion of chemical energy into heat energy

(b) Conversion of heat energy into electrical energy

(c) Conversion of chemical energy into electrical energy

(d) Conversion of electrical energy into chemical energy VIEW SOLUTION
• Question 9
From the listed electrical devices, which of these release heat energy that is not appreciated?

(a) Water heater

(b) Electric motor

(c) Electric heater

(d) Oven VIEW SOLUTION
• Question 10
Sonika is working with the circuit shown in the figure. The circuit has two gaps X and Y. She has wires of five different materials - I, II, III, IV and V. She knows that the bulb will
light up only when both gaps are filled with conducting materials.

She records her observations in a table. After completing the experiment, ink fell on the paper and she lost entries in row 3.
 Material in X Material in Y Bulb (On/Off) 1 I II Off 2 I IV On 3 Off 4 III V On

Based on the rest of the information in the table, what could be the materials in row 3?

(a) I and III

(b) II and III

(c) III and IV

(d) IV and V VIEW SOLUTION
• Question 11
Which of the following represents Ohm's Law?

(a) I – Q . t

(b)  I= V . R

(c) $\mathrm{I}=\frac{\mathrm{R}}{\mathrm{V}}$

(d) $\mathrm{I}=\frac{\mathrm{V}}{\mathrm{R}}$ VIEW SOLUTION
• Question 12
Which of the following detects the presence of electrical energy?

(a) Fuse

(b) Battery

(c) Voltmeter

(d) Galvanometer VIEW SOLUTION
• Question 13
Who gave the principle of electromagnetic induction?

(b) Oersted

(c) Ampere

(d) Volta VIEW SOLUTION
• Question 14
Which instrument converts mechanical energy into electrical energy?

(a) Electric motor

(b) Electric iron

(c) Electric generator

(d) Electric oven VIEW SOLUTION
• Question 15
Which artificial satellite is responsible for Weather forecast?

(a) METSAT

(b) INSAT

(c) CARTOSAT

(d) EDUSAT VIEW SOLUTION
• Question 16
Raghu learnt something in school and he told his friends "An object can appear smaller or bigger in size depending on its distance from you. So, an elephant can look as small as a cat if it is far away."

Based on this, his friends said the following:
Kabir: "All stars are of the same size."
Raina: "All other stars are definitely smaller than the Sun."
Karen: "The Sun and the Moon are definitely of the same size."
Shifa: "There could be a star which is bigger than the Moon."

Who is correct?

(a) Only Shifa.

(b) Only Raina.

(c) Only Kabir and Karen.

(d) Only Kabir and Raina VIEW SOLUTION
• Question 17
Which of the following is a satellite of Neptune?

(a) Titon

(b) Phobos

(c) Demos

(d) Triton VIEW SOLUTION
• Question 18
Which of the following is not a member of Solar system?

(a) Asteroids

(b) Shooting star

(c) Sun

(d) Artificial satellite VIEW SOLUTION
• Question 19
Which of the following is a strong acid?

(a) Sulphuric acid

(b) Acetic acid

(c) Tartaric acid

(d) Lactic acid VIEW SOLUTION
• Question 20
Who was the scientist to propose proton transfer of acid-base theory?

(a) Arrhenius

(b) Bronsted Lowry

(c) Robert Boyle

(d) Rutherford VIEW SOLUTION
• Question 21
Which by-product gas is released when an acid reacts with metal?

(a) Di-nitrogen

(b) Di-oxygen

(c) Di-hydrogen

(d) Di-chlorine VIEW SOLUTION
• Question 22
What is added to the alkaline soil to make it neutral by farmers?

(a) Lime

(b) Gypsum

(c) Salt

(d) Blue Vitriol VIEW SOLUTION
• Question 23
Which alloy is used to prepare scientific balance?

(a) Duralumin

(b) Steel

(c) Bronze

(d) Magnelium VIEW SOLUTION
• Question 24
Which of the following metals exist in nature in liquid state?

(a) Iron

(b) Copper

(c) Aluminium

(d) Galium VIEW SOLUTION
• Question 25
Which of the following is the formula of the iron ore 'Haematite'?

(a) Fe2O3

(b) Fe3O4

(c) FeCO3

(d) FeS2 VIEW SOLUTION
• Question 26
What is used as a catalyst in manufacture of sulphuric acid by contact process?

(a) Al2O3

(b) K2O

(c) V2O5

(d) Fe VIEW SOLUTION
• Question 27
Pavan sorts some materials into two different groups and notes down their properties. They are listed in the following table:
 Group-I Group-II Cannot be beaten into thin sheets. Can be beaten into thin sheets. When one end is in contact with a hot object, the other end does not become hot quickly. When one end is in contact with a hot object, the other end becomes hot quickly. Cannot be turned into thin wires. Can be turned into thin wires.

Which of the following statements could be INCORRECT?

(a) Materials of group II can be used to make bells.

(b) Materials of group I are generally not shiny and hard.

(c) Materials of group I are generally less dense than materials of group II

(d) Materials of group II can be used to make materials which are non-conductors of electricity. VIEW SOLUTION
• Question 28
Which of the following is not a neutral oxide?

(a) CO

(b) N2O

(c) H2O

(d) SO2 VIEW SOLUTION
• Question 29
Which of the following is not a fossil fuel?

(a) Mineral coal

(b) Wood

(c) Petroleum

(d) Natural gas VIEW SOLUTION
• Question 30
Whose formula is C3H8?

(a) Methane

(b) Ethane

(c) Propane

(d) Butane VIEW SOLUTION
• Question 31
Which type of coal is used in Thermal Power stations?

(a) Peat

(b) Lignite

(c) Bitumen

(d) Anthracite VIEW SOLUTION
• Question 32
What are the components of Water gas?

(a) Carbon dioxide and Hydrogen

(b) Carbon and Hydrogen

(c) Carbon monoxide and Hydrogen

(d) Ammonia and Hydrogen VIEW SOLUTION
• Question 33
Which of the following functional group constitute the formation of detergent?

(a) — SO3Na

(b) — COONa

(c) — COOH

(d) — OH VIEW SOLUTION
• Question 34
Which of the following is used in the preparation of vinegar?

(a) Ethanol

(b) Propanone

(c) Methanal

(d) Acetic acid VIEW SOLUTION
• Question 35
What is the monomer unit of natural rubber?

(a) Isoprene

(b) Ethene

(c) Neoprene

(d) Tetrafluro ethene VIEW SOLUTION
• Question 36
By which of the following, Bile is secreted in human digestive system?

(a) Pancreas

(b) Liver

(c) Kidney

(d) Stomach VIEW SOLUTION
• Question 37
In which part of the body, the blood is purified?

(a) Heart

(b) Atrium

(c) Lungs

(d) Ventricle VIEW SOLUTION
• Question 38
Which Valve constitutes its presence between Left Atrium and Left Ventricle of human heart?

(a) Bicuspid Valve

(b) Tricuspid Valve

(c) Semi-circular Valve

(d) None of the given three VIEW SOLUTION
• Question 39
During which process is blood filtered in Bowman's capsule?

(a) Reabsorption

(b) Secretion

(c) Ultra filtration

(d) None of the given three. VIEW SOLUTION
• Question 40
Which of the following brings oxygenated blood into left Atrium in heart?

(a) Superior Venacava

(b) Inferior Venacava

(c) Pulmonary Artery

(d) Pulmonary Vein VIEW SOLUTION
• Question 41
The growth of a pollen tube towards ovule is caused by ________________.

(a) Phototropism

(b) Hydrotropism

(c) Gravitropism

(d) Chemotropism VIEW SOLUTION
• Question 42
The deficiency of which hormone causes diabetes?

(a) Thyroxin

(b) Insulin

(d) Estrogen VIEW SOLUTION
• Question 43
Which of the following constitutes male reproductive system?

(a) Prostate gland

(b) Ovary

(c) Fallopian tube

(d) Uterus VIEW SOLUTION
• Question 44
It is a commonly held misconception that the mother's egg is responsible for determining whether the baby will be a boy or a girl. But actually it is the father's sperm, which decides this.

Which of the following makes the sperm the decisive factor?

(a) A long tail is found only in the sperm, which is not present in the egg.

(b) There are more number of chromosomes in sperms compared to eggs

(c) Hormones are secreted only in the males which are present in the sperms

(d) A sperm can have either of the two sex chromosomes, while the egg has only one. VIEW SOLUTION
• Question 45
By the process of artificial selection of evolution, which of the following is developed for sterile flowers?

(a) Broccoli

(b) Cauliflower

(c) Kohlrabi

(d) Kale VIEW SOLUTION
• Question 46
Who was the first scientist to perform series of experiments to study acquired and inherited traits?

(a) Watson

(b) Sutton

(c) Mendel

(d) Khurana VIEW SOLUTION
• Question 47
Which of the following is an example of biodegradable waste?

(a) Glass

(b) Metal

(c) Plastic

(d) Fruits VIEW SOLUTION
• Question 48
Which of the following is responsible for the 80% depreciation in the Ozone layer?

(a) Chlorofluro Carbon

(b) Chloride ion

(c) Sulphur ion

(d) Magnesium ion VIEW SOLUTION
• Question 49
Chipko-Andolan (Hug the trees movement) is the well known example of conservation of which form of nature?

(a) Jungle

(b) Water

(c) Coal

(d) Petroleum VIEW SOLUTION
• Question 50
Which leaves are used in the manufacture of Bidis?

(a) Khakro

(b) Tendu

(c) Eucalyptus

(d) Banyan VIEW SOLUTION
• Question 51
State the future challenges using Nanotechnology.               [2]

OR

Explain the benefits of Nanotechnology to the health sector of human beings. VIEW SOLUTION
• Question 52
By passing 240 volts in an electric heater, 2A current passes through it. Find the current passed in the heater if 120 volts is passed; and also calculate the resistance of the coil of heater.                [2] VIEW SOLUTION
• Question 53
Write the industrial name of ethyne with its uses.            [2]

OR

What is Isomerism? Write the name and the formula of isomers of Butane. VIEW SOLUTION
• Question 54
Explain the flow of blood in heart. (Figure not required)                [2] VIEW SOLUTION
• Question 55
By which method should the domestic garbage be disposed?              [2] VIEW SOLUTION
• Question 56
Describe briefly about planet Mars.                [2] VIEW SOLUTION
• Question 57
4.9 gm of H2SO4 is mixed with Water to form 5 litres of aqueous solution. Find its concentration. (Molecular weight of H2SO4 is 98 gm/mole)               [2] VIEW SOLUTION
• Question 58
Write the characteristics of hormonal secretions.                [2] VIEW SOLUTION
• Question 59
Explain the importance of homologous organs in the process of evolution.           [2]

OR

Write a short note on heredity. VIEW SOLUTION
• Question 60
What steps should be taken for conservation of energy resources?             [2] VIEW SOLUTION
• Question 61
State the defects of vision in human eyes and its remedies. Explain the defect of myopia and remedies to control it.         [3] VIEW SOLUTION
• Question 62
Explain the construction and working of Electric bell with a diagram.         [3]

OR

What safety measures should be taken during the use of Electricity? VIEW SOLUTION
• Question 63
Explain the industrial preparation of Ammonia by Haber's process. Write two physical properties of Ammonia.             [3] VIEW SOLUTION
• Question 64
Define Functional group. Write any four organic functional groups with their formula.              [3]

OR

Describe Fisher Tropsch process in the manufacture of propanone with equations two uses. VIEW SOLUTION
• Question 65
With the help of a diagram, explain sexual reproduction in flowering plants.                 [3] VIEW SOLUTION
• Question 66
What is Mirror formula? Derive the relation $\frac{1}{\mathrm{u}}+\frac{1}{\mathrm{v}}=\frac{2}{\mathrm{R}}$for concave mirror.                [5] VIEW SOLUTION
• Question 67
What is Refining of metals? Explain with diagram the method of electrolysis by which Copper is purified.              [5]

OR

What is concentration of ores? Explain the process with diagram by which metallic ore with sulphide as an impurity is purified. VIEW SOLUTION
• Question 68
What is respiration? Explain the process of respiration in human beings. (Figure not required)                 [5]

OR

What is Nutrition? Explain with diagram the process of nutrition in Amoeba. VIEW SOLUTION
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