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# Board Paper of Class 10 2015 Chemistry - 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
Primitive man evolved in:

(Africa, America, Australia, India) VIEW SOLUTION

• Question 2
One of the means of indirect transmission of a disease is ___________.
(Sneezing, Droplet from mouth, Placenta, Utensils of Patients) VIEW SOLUTION

• Question 3
If a water soaked seed is pressed, a small drop of water comes out through :
(stomata, lenticel, micropyle, radicle) VIEW SOLUTION

• Question 4
The xylem in the plants are responsible for:
(transport of water, transport of food, transport of amino acids, transport of oxygen) VIEW SOLUTION

• Question 5
What is called as "black gold"?
(Hydrocarbons, Coal, Petroleum, Ether) VIEW SOLUTION

• Question 6
The mixture of gases used by deep sea divers is ____________.
(Helium-Oxygen, Oxygen-Nitrogen) VIEW SOLUTION

• Question 7
Vinegar is present in acetic acid. Curd contains _________ acid.
(Lactic acid/Tartaric acid) VIEW SOLUTION

• Question 8
Any metal mixed with mercury is called amalgam. The amalgam used for dental filling is ________.
(Ag-Sn amalgam, Cu-Sn amalgam, Ag-Au amalgam) VIEW SOLUTION

• Question 9
Number of periods in the Modern Periodic table is _________.
(7, 17, 8, 18) VIEW SOLUTION

• Question 10
Even though it is a non-metal, graphite conducts electricity. It is due to the presence of _________.
(free electrons/bonded electrons) VIEW SOLUTION

• Question 11
The freezing of biotechnology products like vaccines require _________ freezing systems.
(Helium, Nitrogen, Ammonia, Chlorine) VIEW SOLUTION

• Question 12
The potential difference required to pass a current of 0.2 A in a wire of resistance 20 ohms is ____________.
(100V, 4V, 0.01V, 40V) VIEW SOLUTION

• Question 13
Kilowatt-hour is the unit of ___________.
(potential difference, electric power, electric energy, charge) VIEW SOLUTION

• Question 14
An electric current through a metallic conductor produces ____________ around it.
(heat, light, magnetic field, mechanical force) VIEW SOLUTION

• Question 15
The defect myopia can be corrected by using a __________.
(Convex lens, Concave lens, Concave mirror, Convex mirror) VIEW SOLUTION

• Question 16
Identical twins are syngeneic with similar chromosomal contents. Natural clones are those who possess identical chromosomes.
Fill up with the suitable word given in the brackets.
(a) Identical twins are __________.
(natural clones/identical clones)
(b) Identical twins are __________.
(dissimilar to each other/similar to each other)
VIEW SOLUTION

• Question 17
Match the following vitamins with their deficiency diseases.
 Sl. No. Vitamins Deficiency diseases 1 Vitamin A Beri beri 2 Vitamin B1 Scurvy 3 Vitamin C Rickets 4 Vitamin D Nyctalopia
VIEW SOLUTION

• Question 18

This diagram is of a human brain and the functions of different parts are given below. Mark A and B in the parts of the brain corresponding with the function.
(A) Seat of smell
(B) Seat of vision VIEW SOLUTION

• Question 19
Based on relationship fill in the blanks.-
Thyroxin : personality hormone

• Question 20
Correct the statements if they are wrong.
(a) Alpha cells produce insulin and beta cells produce glucagon.
(b) Ovary produces eggs and Androgen. VIEW SOLUTION

• Question 21

Redraw the diagram and label the following parts :
(a) Exine
(b) Tube nucleus VIEW SOLUTION

• Question 22
Based on relationship, fill up :
Whale : Baleen plates
Bat : __________. VIEW SOLUTION

• Question 23

Draw the diagram and label any two parts mentioned below :
(a) Bowman's capsule
(b) Glomerulus
(c) Loop of Henle
(d) Collecting duct VIEW SOLUTION

• Question 24
Fill in the blanks.
(a) Plasma : Fibrinogen ; RBC : __________.
(b) WBC : __________. VIEW SOLUTION

• Question 25
Pick the odd one out.
The parts of the alimentary canal are :
(Pharynx, Mouth, Buccal Cavity, Pancreas) VIEW SOLUTION

• Question 26
Study the food chain below, correct it and convert into a pyramid of energy.
Mulberry → Sparrow → Caterpillar → Kite VIEW SOLUTION

• Question 27
A non-renewable resource is a natural resource if it is replaced by natural process at a rate of consumption by human.

Read this statement and confirm whether it is correct or incorrect. If it is incorrect give the correct statement. VIEW SOLUTION

• Question 28
The Pie diagram represents a survey result of infectious diseases of a village during 2008 - 2009.
Analyse it and answer the following questions.

(a) Which diseases affect the majority of the population?
(b) How are these diseases transmitted? VIEW SOLUTION

• Question 29
Pick out the suitable appliances to conserve the electric energy.
(Fluorescent bulbs, copper choke, solar water heater, electric water heater, tungsten bulbs, electronic choke.) VIEW SOLUTION

• Question 30
Distinguish between the true solution and colloidal solution. VIEW SOLUTION

• Question 31
Find the concentration of solution in terms of weight percent if 20 grams of common salt is dissolved in 50 grams of water. VIEW SOLUTION

• Question 32
From the given examples form the pair of isotopes and the pair of isobars.
VIEW SOLUTION

• Question 33
What type of chemical reaction takes place when :
(a) lime stone is heated
(b) a magnesium ribbon is burnt in air. VIEW SOLUTION

• Question 34
Match the following :
 Sl. No. Source Acid present 1 Apple Oxalic acid 2 Lemon Tartaric Acid 3 Grape Malic Acid 4 Tomato Citric acid
VIEW SOLUTION

• Question 35
Iron reacts with Con. HCl and Con. H2SO4. But it does not react with Con. HNO3. Suggest your answer with proper reason. VIEW SOLUTION

• Question 37
Match the following compounds with their functional groups :
 SI. No. Compounds Functional Groups 1 Alcohol > C = O 2 Aldehyde –OH 3 Ketone –COOH 4 Carboxylic acid –CHO
VIEW SOLUTION

• Question 38
Fill in the blanks.
(a) Force = mass × acceleration, then momentum = __________ ? __________.
(b) Liquid hydrogen is for rocket, then __________  is for MRI. VIEW SOLUTION

• Question 39
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. VIEW SOLUTION

• Question 40
Calculate the energy produced when 1 kg of substance is fully converted into energy.
(Note : c = 3 × 10ms–1) VIEW SOLUTION

• Question 41
Correct the mistakes, if any in the following statements :
(a) A good source of energy would be one which does a small amount of work per unit volume of mass.
(b) Any source of energy we use to do work is consumed and can be used again. VIEW SOLUTION

• Question 42
Draw the schematic diagram of an electric circuit consisting of a battery of two cells of 1.5 V each, three resistance of 5 ohm, 10 ohm and 15 ohm respectively and a plug key all connected in series. VIEW SOLUTION

• Question 43
Correct the mistakes, if any, in the following statements :
(a) Magnetic field is a quantity that has magnitude only.
(b) The magnetic field lines emerge from the south pole and merge at the north pole. VIEW SOLUTION

• Question 44
From the following description write down the names of the parts in human eye.
(a) Dark muscular diaphragm that controls the pupil.
(b) The screen where the image is formed by eye lens. VIEW SOLUTION

• Question 45
You know that myopia is a common refractive defect of vision. Person with this defect can see only nearby objects clearly. Using concave lens of suitable power this defect is corrected.
(a) Mention other two types of defects like this.
(b) Explain how we can correct it. VIEW SOLUTION

• Question 46
What are the various applications of Bio Technology. Explain. VIEW SOLUTION

• Question 47
(a) Suggest some controlling measures to the local authorities concerned.
(b) Pick out the right symptom for malaria.
(Chill and Shiver and a rise in temperature, Diarrhoea)
VIEW SOLUTION

• Question 48
Write the two events involved in the sexual reproduction of flowering plants.
(a) Discuss the first event and write the types

• Question 49
In your area there is, scarcity of water and due to this people are affected. So, what are the measures to be taken by you to meet out the scarcity of water. VIEW SOLUTION

• Question 50
(a) Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.
Gram atomic mass of hydrogen =1 g
Gram atomic mass of oxygen=16 g
(b) Atoms and molecules are the building blocks of matter. List out any three differences between them. VIEW SOLUTION

• Question 51
Write the common name and IUPAC name of the following

(a) CH3CH2CHO

(b) CH3COCH3

(c) $\begin{array}{ccccc}{\mathrm{CH}}_{\mathrm{3}}& –& \mathrm{CH}& –& {\mathrm{CH}}_{\mathrm{3}}\\ & & |& & \\ & & \mathrm{OH}& & \end{array}$

(d) CH3COOH

(e) HCHO VIEW SOLUTION

• Question 52
(a) Explain Newton's first law of motion with an example.

(b) $\mathrm{F}=\frac{{\mathrm{Gm}}_{1}{\mathrm{m}}_{2}}{{\mathrm{d}}^{2}}$ is the mathematical form of Newton's law of gravitation.
Give the statement of Newton's law of gravitation.
VIEW SOLUTION

• Question 53
(a) Draw and label the diagram given below :

 (i) Incident ray (ii) Refracted ray (iii) Emergent ray (iv) Angle of refraction (v) Angle of deviation (vi) Angle of emergence

(b) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light? VIEW SOLUTION
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