Madhyamik Physical Science Question Paper 2018
Madhyamik, the Class 10 School leaving examination, is conducted by the West Bengal Board of Secondary Education (WBBSE). The examination is held in the month of February 2018. Each paper started on each day from 11.45 A.M to 3.00 P.M
Students can download the syllabus and the model question papers from the official website of West Bengal Board of Secondary Education. Here is the link is provided http://www.wbbse.org/.
Having the knowledge of previous years question papers of Madhyamik Pariksha is essential for achieving the best performance. At the Vision Success (website), you can view or even can downloaded in PDF form, the previous year question papers. This post provides you the Madhyamik Physical Science Question Paper 2018.
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Physical Science 2018 |
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Solved Part B |
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Vision Success
West Bengal Board Secondary Education
2018
Physical Science
(Time: 3 Hours 15 Minutes)
Full Marks: 90
(New syllabus)
English Version
(Click to Download PDF)
All Questions of Group A are compulsory
Candidate should follow options in other groups
Group-A
1. Multiple choice questions. Four alternatives are given as answer for each of the following questions. Write the correct one. 1x 15 = 15
1.1 Which of the following greenhouse gases has maximum contribution
towards global warming?-
(a) N,O
(b) CH,
(c) C0,
(d) H,O vapour
1.2 According to Boyle's law which is the PV-P graph?
(a) PV
(b) PV
(c) PV
(d) PV
1.3 If the vapour density of a carbon containing gaseous substance is 13. which of the following can be its molecular formula?-
(a) CO,
(b) C2Hl,
(c) CH,
(d) C,H
1.4 The unit of co-efficient of linear expansion of a solid is-
(a) m
(b) m
(c) °C-
(d) °C.
1.5 An object is placed in between the optical centre and focus of a thin convex lens. What is the nature of image of the object?-
(a) real and inverted
(b) virtual and inverted
(c) real and erect
(d) virtual and erect.
1.6 When a ray of light is incident perpendicularly on a transparent glass slab, what will be its angle of deviation?-
(a) 0°
(b) 180°
(c) 30°
(d) 90°.
1.7 Which of the units given below is the SI unit of resistance?-
(a) volt
(b) ampere
(c) coulomb
(d) ohm
1.8 In domestic electric circuit the fuse wire is connected to which of the following?-
(a) earth line
(b) live line
(c) neutral line
(d) both live and neutral line.
1.9 p-ray emitted from a radioactive element is-
(a) a stream of electrons
b) a stream of protons
(c) a stream of neutrons
(d) electromagnetic wave.
1.10 How many groups are there in the long periodic table?-
(a) 7
(b) 8
(c) 9
(d) 18.
1.11 n formation of which of the following compounds octet rule is not obeyed?-
(a) NaCl
(b) LiH
(c) KCI
(d) CaO.
1.12 Which of the following can conduct electricity?-
(a) molten NaCI
(b) liquid HCI
(c) solid NaCl
(d) aqueous solution of glucose.
1.13 What will be the colour of the resulting solution when excess aqueous ammonia is added to an aqueous solution of copper sulphate?-
(a) yellow
(b) green
(c) deep blue
(d) brown.
1.14 n which of the following alloys zinc is present-
(a) bell metal
(b) brass
(c) bronze
(d) duralumin.
1.15 Which of the following is a saturated hydrocarbon?-
(a) C,H,
(b) C,H
(c) CH,
(d) C,Hg.
Group-B
2. Answer the following questions: (Alternatives are to be noted):
2.1 Mention one use of biogas.
OR, What is the role of NO in decomposition of ozone in the ozone layer?
2.2 Among charcoal. petrol and ethanol which one is a fossil fuel?
2.3 Under constant pressure, at what temperature in degree Celsius the volume of an ideal gas will be zero according to Charles' law?
2.4 What is the unit of M in the equation PV = M RT? (Symbols usual meaning)
2.5 Whether the following statement is 'true' or 'false'?
The real expansion of any liquid depends on the expansion of the vessel in which it is kept.
OR, Among iron, invar and copper which one has the least coefficient of linear expansion?
2.6 Between the angle of incidence and the angle of refraction which one is greater when light travels from a rarer to a denser medium?
2.7 What type of mirror is used in the viewfinder of a motor car?
2.8 How does the resistance of a semiconductor change with increase of temperature?
2.9 Which type of energy is transformed to electrical energy in a dynamo?
2.10 Arrange o. B and y-rays in ascending order of their penetrating power.
OR, Which kind of nuclear reaction is the source of sun's energy?
2.11 Match the right Column with the left Column 1x 4 =4
Left Column Right Column
2.11.1 An alkali metal (a) F
2.11.2 An element whose anion (b) Fe accelerates rusting of iron
2.11.3 Extracted from hematite (c) K
2.11.4 Most electronegative element (d) CI
2.12 What type of chemical bond is present in Ca0?
2.13 What is used as cathode to electroplate silver over a copper spoon:
OR, Give example of a compound whose aqueous solution is a weak electrolyte.
2.14 During electrolysis which electrode is called a cathode?
2.15 State one use of liquid ammonia.
OR, Write the formula of the precipitate formed when aqueous ammonia solution is added to aqueous solution of aluminum chloride.
2.16 In the laboratory preparation of nitrogen, aqueous solution of which compound is mixed with aqueous solution of ammonium chloride and heated?
2.17 Write the IUPAC name of CHCH,CHO.
OR, Write the structural formula of positional isomer of CH,CHCH,OH.
2.18 Mention one use of poly (tetrafloro-ethylene).
Group-C
Answer the following questions (alternatives are to be noted) : 2x9 18
3.1 What is methane hydrate?
3.2 The pressure of a fixed mass of a gas at a temperature of 0°C is doubled while the volume is halved. What will be the final temperature of the gas?
OR, Under constant pressure fixed mass of a gas is heated from 0°C to 546°C. What is the ratio of the final volume of the gas with its initial volume?
3.3 What is meant by the optical centre of a convex lens?
OR, Why does the earth's sky appear blue during daytime?
3.4 State Lenz's law related to electromagnetic induction.
3.5 Write with an example how according to Lewis concept a covalent bond is formed.
OR, Why the bond in sodium chloride cannot be expressed as Na-C1?
3.6 Give one example each of a liquid and a solid covalent compound.
3.7 Write with balanced chemical equation what happens when H,S gas is passed through an aqueous copper sulphate solution.
3.8 Write down cathode reaction when an aqueous solution of MSO, (M metal) is electrolyzed. Write with reason whether the reaction is oxidation or reduction.
OR, Give one use of each of copper and aluminum.
3.9 What is the condition of substitution reaction of methane with chlorine? Write the balanced chemical equation of the first step of the reaction.
OR, Write with balanced chemical equation what happens when ethanol reacts with metallic sodium.
Group-D
4Answer the following questions (alternatives are to be noted):
4.1 Establish ideal gas equation on the basis of Boyle's law. Charles' law
and Avogadro's law.
4.2 SO required for the industrial production of sulphuric acid is produced. By burning iron pyrites in excess air current. The chemical equation of the Caction is given below: 4FeS; + 1 10, 2Fe,0, + 8S0. How many gram of FeS, is required for production of 512g of S0,? (Fe = 56. S = 32, O = 16).
OR, By heating 200g of a metal carbonate I12g metal oxide and a gaseous. compound are produced. Vapour density of the gaseous compound is 22. How many moles of the gaseous compound is produced in the reaction?
4.3 What is thermal conductivity? What is its SI unit?
OR, Define coefficient of surface expansion. Write its SI unit.
4.4 How can an erect and magnified image be formed with the help of a convex lens? With the help of which type of lens long-sightedness can be rectified ?
4.5 If the velocity of light in a medium is 2 x 10 m/s, what will be the refractive index of that medium?
OR, The' refractive index of a medium with respect to air is V2. If the angle of incidence of a ray of light in air is 45° determine the angle of deviation for that ray in case of refraction.
4.6 Write Joule's laws related to heating effect of current.
4.7 Calculate the equivalent resistance when a wire of resistance 10 ohm is divided in two equal parts and connected in parallel combination.
OR, There are two 60 watt lamps and two 80 watt fans in a house. The lamps and fans run 5 hours daily. Find out the expense in a month if an unit of electricity costs Rs. 4/-. (assume one month = 30 days).
4.8 Compare the charge and ionizing power of a- and y-rays. Mention one use of radioactivity.
4.9 What is a meant by ionization energy of an atom of an element? Arrange Li, Rb, K and Na in the increasing order of their ionization energy.
OR, Mention similarity of properties of hydrogen with one property of Group 1 elements and two properties of Group 17 elements.
4.10 What are present along with pure alumina in the molten mixture which is electrolyzed for the extraction of aluminum by electrolysis? What are used as cathode and anode in this electrolysis?
4.11 Write the conditions and balanced chemical equation for the induct production of ammonia by Haber's process.
4.12 The molecular formula of an organic compound is C,HO. The compound is soluble in water and on addition of NafHCO; to the aqueous solution a of the compound CO, is evolved. Identify the organic compound. Write, with conditions and balanced chemical equation, the reaction of the compound with ethanol.
OR, Compare three properties of organic and inorganic compounds.
Tags:
M-18