Board Paper of Class 10 2014 Science - Solutions

• Question 1
  What is the general formula of alkyne series?
  
  (a) C_nH_n
  
  (b) C_nH_{2n – 2}
  
  (c) C_nH_{2n + 2}
  
  (d) C_nH_2n VIEW SOLUTION

• Question 2
  ​Which power station in Gujarat uses natural gas as fuel?
  
  (a) Sardar Sarovar power Station
  
  (b) Dhuvaran Power Station
  
  (c) Ukai Power Station
  
  (d) Vanakbori Power Station VIEW SOLUTION

• Question 3
  C₃H₈ is the molecular formula of which compound?
  
  (a) Propyne
  
  (b) Propene
  
  (c) Methane
  
  (d) Propane VIEW SOLUTION

• Question 4
  ​Which of the following is the use of propanone?
  
  (a) As preservative
  
  (b) Antiseptic
  
  (c) Antibiotic
  
  (d) To remove nail polish VIEW SOLUTION

• Question 5
  What is the molecular formula of formalin?
  
  (a) HCOOC₂H₅
  
  (b) HCOOH
  
  (c) HCHO
  
  (d) HCOOCH₃ VIEW SOLUTION

• Question 6
  Which functional group is there in methyl ethanoate?
  
  (a) Ester
  
  (b) Halide
  
  (c) Ketone
  
  (d) Alcohol VIEW SOLUTION

• Question 7
  Make Pairs
   

  Section - I	Section - II
  (a) Rabbit	(i) Omnivore
  (b) Lion	(ii) Carnivore
  (c) Cockroach	(iii) Herbivore

  
  (a) (a - ii), (b - i), (c - iii)
  
  (b) (a - i), (b - ii), (c - iii)
  
  (c) (a - ii), (b - iii), (c - i)
  
  (d) (a - iii), (b - ii), (c - i) VIEW SOLUTION

• Question 8
  In the representation of the circulatory system below, identify the artery that carries deoxygenated blood.
  
  
  
  (a) (D)
  
  (b) (B)
  
  (c) (C)
  
  (d) (A) VIEW SOLUTION

• Question 9
  During which process is blood filtered out in Bowman's capsule?
  
  (a) Reabsorption
  
  (b) Secretion
  
  (c) Ultrafilteration
  
  (d) None of the above VIEW SOLUTION

• Question 10
  How many Uriniferous tubules does a human kidney possess?
  
  (a) 10,000
  
  (b) 100 lakh
  
  (c) 10 lakh
  
  (d) 1 lakh VIEW SOLUTION

• Question 11
  Which of the following structures is responsible for the transportation of water in higher plants?
  
  (a) Companion cell
  
  (b) Sieve cell
  
  (c) Vessel
  
  (d) Sieve tube VIEW SOLUTION

• Question 12
  Which is a male sex hormone?
  
  (a) Progresterone
  
  (b) Adrenaline
  
  (c) Testosterone
  
  (d) Estrogens VIEW SOLUTION

• Question 13
  The plant part which exhibits negative geotropism is:
  
  (a) Leaves
  
  (b) Stem
  
  (c) Branch
  
  (d) Root VIEW SOLUTION

• Question 14
  An alga which reproduces by the asexual reproduction method called fragmentation is:
  
  (a) Spirogyra
  
  (b) Salmonella
  
  (c) Plasmodium
  
  (d) Rhizopus VIEW SOLUTION

• Question 15
  The cut part of a plant stem (having roots and fixed to the ground) which is used in the process of grafting is:
  
  (a) A bud
  
  (b) A scion
  
  (c) A cutting
  
  (d) A stock VIEW SOLUTION

• Question 16
  The continuity of features from one generation to another is known as :
  
  (a) Generation
  
  (b) Mutation
  
  (c) Heredity
  
  (d) Evolution VIEW SOLUTION

• Question 17
  On which of the following plant species has Mendel worked:
  
  (a) Phaseolus mungo
  
  (b) Pisum sativum
  
  (c) Cassia tora
  
  (d) Zea mays VIEW SOLUTION

• Question 18
  First order consumers are:
  
  (a) Omnivores
  
  (b) Herbivores
  
  (c) Decomposers
  
  (d) Carnivores. VIEW SOLUTION

• Question 19
  How much % of the depletion of the ozone occurs in the stratosphere due to CFC (Chloro Fluoro Carbon)?
  
  (a) 100%
  
  (b) 60%
  
  (c) 80%
  
  (d) 45% VIEW SOLUTION

• Question 20
  Which of the following is an andolan for conservation of forests?
  
  (a) Nipco andolan
  
  (b) Chipko andolan
  
  (c) Sipco andolan
  
  (d) Ripco andolan VIEW SOLUTION

• Question 21
  Which one of the following is considered as liquid gold?
  
  (a) Fuel oil
  
  (b) Diesel
  
  (c) Petroleum
  
  (d) Kerosene VIEW SOLUTION

• Question 22
  Nanotechnology is a science which involves the study of matter particles.
  
  (a) Whose all the dimensions are less than 10^–3m
  
  (b) Whose at least one dimension is between 1 nm and 100 nm
  
  (c) Which cannot be seen with naked eyes
  
  (d) Whose all dimensions are between 1nm and 100 nm VIEW SOLUTION

• Question 23
  Thermal conductivity of standard SWNT along its length is ______ watt /m.k
  
  (a) 35
  
  (b) 35,000
  
  (c) 3500
  
  (d) 385 VIEW SOLUTION

• Question 24
  What is the focal length of a convex lens having power +5.0D?
  
  (a) +20 cm
  
  (b) +10 cm
  
  (c) –20 cm
  
  (d) –10 cm VIEW SOLUTION

• Question 25
  What is the relation between the radius of curvature (R) and the focal length (F) of a spherical mirror ?
  
  (a) R = 3F
  
  (b) R = 2F
  
  (c) R = F
  
  (d) R = F/2 VIEW SOLUTION

• Question 26
  Optical fibres used in signal communication work on which principle?
  
  (a) Refraction
  
  (b) Dispersion
  
  (c) Scattering
  
  (d) Total internal reflection VIEW SOLUTION

• Question 27
  In human eye, the image of an object is formed at the ________.
  
  (a) Retina
  
  (b) Cornea
  
  (c) Pupil
  
  (d) Iris VIEW SOLUTION

• Question 28
  Meena ben's age is 45 yrs. She cannot see the nearby objects clearly, but distant object can be seen clearly by her. To correct this defect of vision, what type of spectacles should she wear?
  P = Convex lens, Q = Concave lens
  
  (a) None from P & Q
  
  (b) Only P
  
  (c) Both P & Q
  
  (d) Only Q VIEW SOLUTION

• Question 29
  Which symbol represents resistance in an electric circuit?
  
  (a)
  
  (b)
  
  (c)
  
  (d) VIEW SOLUTION

• Question 30
  If five equal pieces of a resistance wire having 5 Ω resistance are connected in parallel, then their equivalent resistance will be
  
  (a) 25 Ω
  
  (b) 5 Ω
  
  (c) 1/5 Ω
  
  (d) 1 Ω VIEW SOLUTION

• Question 31
  The unit of the resistivity of the material is -
  
  (a) m
  
  (b) m /Ω
  
  (c) Ω/m
  
  (d) Ω VIEW SOLUTION

• Question 32
  During a discussion on the A.C. in a class room, the following views were Put forth.
  Suresh: A.C. can be transmitted over a long distance without much loss of electrical energy.
  Mahesh: Production of A.C. is comparatively easier and cheaper.
  
  Who is right?
  
  (a) Both are wrong
  
  (b) Only Mahesh
  
  (c) Both Suresh and Mahesh
  
  (d) Only Suresh VIEW SOLUTION

• Question 33
  Given diagram represents which type of electric current?
  
  
  
  (a) DC
  
  (b) AC
  
  (c) Both AC and DC
  
  (d) None of the above VIEW SOLUTION

• Question 34
  A coil is wrapped loosely around a cylindrical wooden piece and its ends are connected to a battery as shown. In which case will the compass needle placed near the coil deflect
  when the circuit is closed?
  
  
  
  (a) The needle will deflect even with the wooden piece alone.
  
  (b) Only if the cylindrical wooden piece is replaced by a magnet.
  
  (c) Only if-the cylindrical wooden piece is replaced by a magnet which is moved in and out of the coil.
  
  (d) Only if the cylindrical wooden piece is replaced by an iron piece. VIEW SOLUTION

• Question 35
  When an electric current is passed through the conducting wire, a magnetic field is produced in a region around it. Name the scientist who explained this. He was a science teacher at a school in Denmark.
  
  (a) Ampere
  
  (b) Oersted
  
  (c) Volta
  
  (d) Faraday VIEW SOLUTION

• Question 36
  Statement 1: It is the fifth planet of the solar system.
  Statement 2: It is a luminous planet.
  Statement 3: It is the biggest planet in the solar system.
  Above mentioned statements predict the characteristics of which planet?
  
  (a) Venus
  
  (b) Mercury
  
  (c) Jupiter
  
  (d) Mars VIEW SOLUTION

• Question 37
  Study the table given below and answer the following question.
   

  Planet	Distance from sun (million kms)	Relative mass of planets (scale: earth is 1.0)
  Mars	228	0.11
  Jupiter	778	31.8
  Earth	150	1.0
  Venus	108	0.86

  
  The light from the sun takes about 8 minutes to reach the earth. How long will it take to reach Mars?
  
  (a) It will take the same time, about 8 minutes, as the atmosphere of Mars is thinner than that of Earth.
  
  (b) It will take the same time, about 8 minutes, to reach any place in the solar system.
  
  (c) It will take more than 8 minutes to reach Mars as it is further away from the Sun than the earth.
  
  (d) It will take less' than 8 minutes as Earth is bigger than Mars. VIEW SOLUTION

• Question 38
  Phobos and Demos are two moons of -
  
  (a) Saturn
  
  (b) Jupiter
  
  (c) Venus
  
  (d) Mars VIEW SOLUTION

• Question 39
  Our Sun is___ light years away from the centre of the galaxy.
  
  (a) 3,000
  
  (b) 300
  
  (c) 30
  
  (d) 30,000 VIEW SOLUTION

• Question 40
  Which substance is present in poison of honey bee?
  
  (a) Melittin
  
  (b) Pepsin
  
  (c) Calcium phosphate
  
  (d) Lime VIEW SOLUTION

• Question 41
  What is formed by reaction of non-metal oxide with water?
  
  (a) Metal
  
  (b) Base
  
  (c) Salt
  
  (d) Acid VIEW SOLUTION

• Question 42
  The outer layer of teeth is made up of which hard substance? It does not dissolve in water.
  
  (a) Ca₃(PO₄)₂
  
  (b) Ca₃PO₄
  
  (c) Ca₃PO₂
  
  (d) CaO VIEW SOLUTION

• Question 43
  Which of the following solutions is most basic?
  
  (a) pH = 10.6
  
  (b) pH = 9.3
  
  (c) pH = 11.5
  
  (d) pH = 8.2 VIEW SOLUTION

• Question 44
  Which of the following substances is hygroscopic?
  
  (a) Slag
  
  (b) Feldspar
  
  (c) Anhydrous calcium chloride
  
  (d) Cryolite VIEW SOLUTION

• Question 45
  In which of the following, displacement reaction is possible?
  
  (a) Solution of AgNO₃ + coin of copper
  
  (b) Solution of FeSO₄ + coin of silver
  
  (c) Solution of MgCl₂ + coin of aluminium
  
  (d) Solution of NaCl + coin of copper VIEW SOLUTION

• Question 46
  Which of the following is an alloy?
  
  (a) 24 carat gold
  
  (b) Gallium
  
  (c) 22 carat gold
  
  (d) Silver VIEW SOLUTION

• Question 47
  Make the correct pairs from below mentioned ‘X’ and ‘Y’.
   

  ‘X’	‘Y’
  (a) Extraction of Sulphur	(1) Contact process
  (b) Production of Nitric acid	(2) Frasch method
  (c) Production of Sulphuric acid	(3) Haber's process
  (d) Production of Ammonia gas	(4) Ostwald's method

  
  (a) (a-4), (b-2), (c-3), (d-1)
  
  (b) (a-2), (b-4), (c-1), (d-3)
  
  (c) (a-3), (b-2), (c-4), (d-1)
  
  (d) (a-4), (b-3), (c-2), (d-1) VIEW SOLUTION

• Question 48
  Which of the following oxides is of neutral nature?
  
  (a) N₂O
  
  (b) SO₂
  
  (c) P₂O₅
  
  (d) CO₂ VIEW SOLUTION

• Question 49
  Which of the following acts as catalyst in production of ammonia by Haber’s Process?
  
  (a) Fe
  
  (b) K₂O
  
  (c) V₂O₅
  
  (d) Al₂O₃ VIEW SOLUTION

• Question 50
  Which type of coal does not produce smoke or odour when burnt?
  
  (a) Peat
  
  (b) Lignite
  
  (c) Bitumen
  
  (d) Anthracite VIEW SOLUTION

• Question 51
  “Carbon forms the backbone of the biology of life on earth” Justify.            [2]
   

  OR
   

  Name the important areas related to Nanotechnology. VIEW SOLUTION

• Question 52
  How much work is to be done to take 2 C electric charge from the potential of 6 V to the potential of 12 V?           [2] VIEW SOLUTION

• Question 53
  What is isomerism? Write isomers of butane.             [2]

  
  OR

  
  Explain occurrence of methane and its preparation. VIEW SOLUTION

• Question 54
  Give two differences between arteries and veins.            [2]

  VIEW SOLUTION

• Question 55
  What are global problems?               [2] VIEW SOLUTION

• Question 56
  How are artificial satellites useful in communication?                [2] VIEW SOLUTION

• Question 57
  Define: (a) Arrhenius Acid (b) Arrhenius base           [2] VIEW SOLUTION

• Question 58
  Write the characteristics of hormonal secretions.             [2] VIEW SOLUTION

• Question 59
  Define sex determination. How is sex determined in human beings?            [2]
   

  OR
   

  Name four varieties of vegetables, which have been produced from ‘wild cabbage’ by the process of artificial selection. VIEW SOLUTION

• Question 60
  What are the consequences of the loss of forest cover?            [2] VIEW SOLUTION

• Question 61
  Explain the function of main parts of a human eye by drawing a simple sketch it.            [3] VIEW SOLUTION

• Question 62
  What is a magnetic field? Give the characteristics of magnetic field lines.            [3]

  
  OR

  
  Write a short note on fuse. VIEW SOLUTION

• Question 63
  Explain with diagram the method for preparation of dihydrogen gas in laboratory.               [3] VIEW SOLUTION

• Question 64
  Write a short note on detergents.               [3]
   

  OR
   

  Write the preparation, properties and two uses of Propanone. VIEW SOLUTION

• Question 65
  Explain vegetative propagation with the help of two examples.             [3] VIEW SOLUTION

• Question 66
  Derive the lens formula $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$              [5] VIEW SOLUTION

• Question 67
  Explain the method of concentration of sulphide ore.

  
  OR

  
  Explain the Half-Heroult method to obtain aluminium from alumina by electrochemical reduction.           [5] VIEW SOLUTION

• Question 68
  Describe the process of nutrition in Amoeba. Draw a labelled diagram to show various steps of nutrition in Amoeba.              [5]

  
  OR
   

  What is respiration? Mention its types and explain each with an equation. VIEW SOLUTION