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# Board Paper of Class 10 2014 Physics - Solutions

General Instructions:
1. This question paper contains three sections: Section I, II and III.
2. Section I comprises questions from 1-15. You have to attempt all the 15 questions by choosing the alternatives given in the brackets.
3. Section II comprises questions from 16-47. You have to attempt any twenty questions. Each question carries 2 marks.
4. Section III comprises of four parts: Part I, II, III and IV. You have to attempt any 4 questions by choosing one question from each part. Each question carries 5 marks.
• Question 1
Theory of Natural Selection was proposed by ___________.
(Charles Darwin, Hugo-de-Vries, Gregor Johann Mendel, Jean Baptise Lamarck) VIEW SOLUTION
• Question 2
One of the following is transmitted through air. Find out.
(Tuberculosis, Meningitis, Typhoid, Cholera) VIEW SOLUTION
• Question 3
The product of triple fusion which acts as nutritive tissue for the development of embryo is
(zygote, placenta, scutellum, endosperm) VIEW SOLUTION
• Question 4
The product obtained in the anaerobic respiration of yeast is :
(lactic acid, pyruvic acid, ethanol, acetic acid) VIEW SOLUTION
• Question 5
Example for fossil fuel is :
(Copper, Iron, Magnesium, Coal) VIEW SOLUTION
• Question 6
When sunlight passes through window of classrooms its path is visible. This is due to ___________ of light.
(reflection, scattering) VIEW SOLUTION
• Question 7
Chemical Volcano is an example of ___________.
(combination reaction/decomposition reaction) VIEW SOLUTION
• Question 8
A process employed for the concentration of sulphide ore is ___________.
(froth floatation/ gravity separation) VIEW SOLUTION
• Question 9
The ore of aluminium is ___________.
(haemetite, magnetite, bauxite, siderite) VIEW SOLUTION
• Question 10
Buck Minster Fullerene is the allotropic form of ___________.
(nitrogen/ carbon/ sulphur) VIEW SOLUTION
• Question 11
The weight of 50 kg person at the surface of earth is :
(50 N, 35 N, 380 N, 490 N) VIEW SOLUTION
• Question 12
The energy produced when 1 kg of a substance is fully converted into energy is ___________.
(9 × 1016 J, 9 × 108 J, 18 × 108 J, 18 × 1016 J) VIEW SOLUTION
• Question 13
The main source of bio-mass energy is ___________.
(coal, heat energy, thermal energy, cow-dung) VIEW SOLUTION
• Question 14
The magnification produced by a mirror is $\frac{1}{3}$ then the type of mirror is :
(concave, convex, plane) VIEW SOLUTION
• Question 15
An electric current through a metallic conductor produces ___________ around it.
(heat, light, magnetic field, mechanical force) VIEW SOLUTION
• Question 16
The heritable characters are varying in different species and within the same species. Name the variation in the following cases.

(a) The eye colour among the human beings are varied as blue, black, brown, green etc.
This is called as ___________ variation.

(b) The dentition in rabbit and elephant are not the same.
This is called as ___________ variation.
VIEW SOLUTION
• Question 17
Marasmus and Kwashiorkar are both protein deficiency defects. Marasmus differs from Kwashiorkar in enlarged belly and swelling in the face. Are these symptoms for the above diseases correct? If not, correct it. VIEW SOLUTION
• Question 18
Copy the diagram and label any two parts in the group given.

(cyton, axon, dendron, end plate) VIEW SOLUTION
• Question 19
The important event of meiosis is the crossing over. It occurs during :
(Leptotene, Pachytene, Diplotene, Zygotene) VIEW SOLUTION
• Question 20
Pick out the item which has sequential arrangements.
(a) Zygotene → Leptotene → Pachytene → Diplotene → Diakinesis
(b) Diakinesis → Zygotene → Leptotene → Pachytene → Diplotene
(c) Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis VIEW SOLUTION
• Question 21
In balsam plant the seeds fall off far away from the mother plant.
(a) Is this statement correct or incorrect?
(b) Give reason. VIEW SOLUTION
• Question 22
The epidermis of mammals contains :
(a) Hair, bristle, quills
(b) Hair, nail, claw
(c) Hair, bristle, horn
(d) Hair, nail, scale VIEW SOLUTION
• Question 23
Which organ is known as "Master Chemist"? Why? VIEW SOLUTION
• Question 24
Fill in the blanks :
Plasma : Fibrinogen ; RBC : ___________.
WBC : ___________ VIEW SOLUTION
• Question 25
Match the methods of nutrition of special organs with suitable examples.
 Autotrophs Mycorrhiza Cuscuta Parasites Chlorophyll Monotropa Saprophytes Haustoria Hibiscus
VIEW SOLUTION
• Question 26

(a) Name the processes noted as no. 1 and 3.
(b) Define the process 1. VIEW SOLUTION
• Question 27
The pie diagram represents a survey result of infectious diseases of a village during 2008 - 2009. Analyse it and answer the following chart:

(a) Which diseases affect the majority of the population?
(b) Write any two measures to control the other two diseases. VIEW SOLUTION
• Question 28
Match the suitable renewable and non-renewable sources.
 Sources A B C Renewable Coal Wind Petroleum Non-Renewable Hydrogen Natural gas Solar energy
VIEW SOLUTION
• Question 29
Write any four liquid bio - fuels used for transportation. VIEW SOLUTION
• Question 30
Distinguish between the saturated and unsaturated solution using the data given below.
(a) 16 g NaCl in 100 g water.
(b) 36 g NaCl in 100 g water
(Note - Solubility of NaCl is 36 g) VIEW SOLUTION
• Question 31
When sunlight passes through the window of the classroom, the path of the light is visible. What is this effect called ? Give reason. VIEW SOLUTION
• Question 32
Molecular mass of nitrogen is 28. Its atomic mass is 14. Find the atomicity of nitrogen. VIEW SOLUTION
• Question 33
Why does the colour of copper sulphate change when an iron nail is kept in it? Justify your answer. VIEW SOLUTION
• Question 34
The hydroxyl ion concentration of a solution is 1.0 × 10–8 M. What is the pH of the solution? VIEW SOLUTION
• Question 36
Why cannot aluminium metal be obtained by the reduction of aluminium oxide with coke? VIEW SOLUTION
• Question 37
Fill in the blanks :
 S.No. Molecular formula Common name IUPAC name (1) CH3COOH ___________ Ethanoic acid (2) HCHO Formaldehyde ___________
VIEW SOLUTION
• Question 38
From the following statements write down that which is not applicable to mass of an object :
(a) It is a fundamental quantity.
(b) It is measured using physical balance.
(c) It is measured using spring balance.
(d) It is the amount of matter. VIEW SOLUTION
• Question 39
Correct the mistakes, if any, in the following statements.
(a) One Newton is the force that produces an acceleration of 1 ms–2 in an object of 1 gram mass.
(b) Action and reaction are always acting on the same body. VIEW SOLUTION
• Question 40
Three resistances having the values 5Ω, 10Ω, 30Ω are connected parallel with each other. Calculate the total circuit resistance. VIEW SOLUTION
• Question 41
Volta cell diagram is given below. Label the parts A, B, C and D.

VIEW SOLUTION
• Question 42
Match the following :
 Components Symbols (a) Plug key or Switch (Closed) (b) A wire joint (c) Electric bulb (d) Electric cell
VIEW SOLUTION
• Question 43
Fill in the blanks :
(a) For a motor : a permanent magnet, then commercial motor : ___________.
(b) Focal length of a lens : metre, then for power of a lens : ___________. VIEW SOLUTION
• Question 44
Considering this write down the names of the parts in human eye.
(a) Dark muscular diaphragm that controls the pupil ___________.
(b) The screen at where the image is formed by eye lens ___________. VIEW SOLUTION
• Question 45
The focal length of a concave lens is 2 m, calculate the power of the lens. VIEW SOLUTION
• Question 46
(a) Define genetic engineering.
(b) What are the benefits of genetic engineering? VIEW SOLUTION
• Question 47
Kala has delivered a baby :
(a) Suggest the immunization schedule for the baby in the first six months.
(b) What are all the diseases that can be cured as per the schedule? VIEW SOLUTION
• Question 48
Describe the structure of dicot seed. VIEW SOLUTION
• Question 49
Smoke, smoke, everywhere smoke. Do you agree this situation is good for health. List out the harmful effects of coal burning. VIEW SOLUTION
• Question 50
(a) State any three findings of modern atomic theory.
(b) Write down any two applications of Avogadro's law. VIEW SOLUTION
• Question 51
(a) Define "Esterification".
(b) Write any three uses of ethanol. VIEW SOLUTION
• Question 52
(a) Space stations are used to study the effects of long-space flight on the human body. Justify.
(b) F = G m1m2/d2 is the mathematical form of Newton's law of gravitation. G-gravitational constant, m1, m2 are the masses of two bodies separated by a distance d, then give the statement of Newton's law of gravitation. VIEW SOLUTION
• Question 53

(a) Redraw the above diagram.
(b) This diagram represents _________.
(c) Label the parts of the diagram.
(d) Mention the working principle of the device denoted by this diagram. VIEW SOLUTION
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