Madhyamik Physical Science Question paper

Madhyamik Physical Science Question paper 2018

Madhyamik, the Class 10 School leaving examination, is conducted by the West Bengal Board of Secondary Education (W.B.B.S.E.) every year. 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.

Here is provided Physical Science Question paper 2018. Full Marks is 90 for Regular candidates and 100 for the External Candidates. Time duration is Three Hours Fifteen Minutes.

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2018

Physical Science

(For Regular & External Candidates)

Time; Three Hours Fifteen Minutes

(First fifteen minutes for reading the question paper)

	90 – For Regular Candidates
	100 – For External Candidates

Special credit will be given for answers which are brief and to the point. Marks will be deducted for spelling mistakes, untidiness & bad handwriting.

Only External candidates’ will answer Group E.

Figures in the margin indicate full marks for each question.

Group “A”

Multiple choice questions. Four alternatives are given as answer for each of the following questions. Write the correct ones. 1x15= 15

1.1 Which of the following Greenhouse Gases has maximum

contribution towards global warming?

(a) N₂O (b) CH₄ (c) CO₂ (d) H₂O 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) CO₂ (b C₂H₄ (c) C₂H₄ (d) C₂H₂

1.4 The unit of coefficient of linear expansion of a solid is.

(a) m (b) m^-1 (c) C¹ (d) ⁰C.

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 perpendicular on a transparent

glass slab. What will be its angle of deviation?

(a) 0⁰ (b) 180⁰ (c) 30⁰ (d) 90⁰

1.7 Which of the units given below is the S.I 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

1.9 Β- ray emitted from a radioactive element is

(a) A stream of neutron (b) a stream of protons

1.10 How many groups are there in the long periodic table?

(a) 7 (b) 8 (c) 9 (d) 18

1.11 In formation of which of the following compounds octet rule

is not employed?

(a) NaCl (b) LiH (c) KCl (d) CaO

1.12 Which of the following can conduct electricity?

(a) Molten NaCl (b) liquid HCl

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) deep blue (c) green (d) brown

1.14 In 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) C₃H¹₆ (b) C₂H₄ (c) C₂H₂ (d) C₂H₆

Group-B

2. Answer the following questions. Alternative are to be

noted.
Fill in the blanks: 1x21=21

2.1 Mention one use of bio-gas.

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 = ^W/_M RT?

2.5 Whether the following statement is true of false?

The real expansion of any liquid depends on the expansion of

the vessel in which it is kept

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 of

linear expansion?

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 ἁ, B and y rays in ascending order of their

penetrating power.

Or,

Which kind of nuclear reaction is the source of sun’s energy?¹

2.11 Match the following right column with left column.

A		B
2.11.1	An alkali metal	F
2.11.2	An element whose anion accelerates rusting or iron	Fe
2.11.3	Extracted from hematite	K
2.11.4	Most electro-negative element	Cl

2.12 What type of chemical bond is present in CaO?

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 CH₃CH₂CHO.

Or,

Write the structural formula of positional isomer of

CH₃CH₂CH₂OH

2.18 Mention one use of poly(tetrafluoroethelene)

Group C

3. Answer the following questions 2x9=18

3.1 What is methane hydrate?

3.2 The pressure of a fixed mass of a gas at a temperature of 0⁰C

is double while the volume is halved. What will be the final

temperature of the gas?

Or,

Under constant pressure of fixed mass of a gas is heated

from 0⁰C to 546⁰ 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-Cl?

3.6 Give one example each of a liquid and a solid covalent

compound.

3.7 Write with balanced chemical equation what happens when

H₂S gas is passed through an aqueous copper sulphate

solution?

3.8 Write down cathode reaction when an aqueous solution of

MSO4 (Me=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.

Write with balanced chemical equation what happens when

ethanol reacts with metallic sodium.

Group D

4. Answer the following questions (alternatives are to be noted)

4.1 Establish the ideal gas equation on the basis of Boyle’s law,

Charles’s law and Avogadro’s law.

4.2 SO₂ required for the industrial production of sulphuric acid is

produced by burning iron pyrites in excess air current. The

chemical equation of the reaction is given below

4FeS₂ + 110₂ → 2Fe₂O₃ + 8SO₂

Or,

By heating 200 g of a metal carbonate 112 g 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?

Or,

Define coefficient of surface expansion. Write its S.I 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 2x10⁸ m/s, what will be

the refractive index f that medium?

Or,

The refractive index of a medium with respect to air is “√2. If the angle of incidence of a ray of light in air is 45⁰ 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,

Three 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 a unit of electricity cost Rs 4/- (assume, one month = 30 days)?

4.8 Compare the charge and ionizing power of ἁ, y rays. Mention

one use of radioactivity?

4.9 What is 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 similarly 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?

4.11 Write the conditions and balanced chemical equation for the

industrial production of ammonia by Haber’s process?

4.12 The molecular formula of an organic compound is C₂H₄O₂.

The compound is soluble in water and on addition of NaHCO₃

to the aqueous solution of the compound, CO₂ 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.

Madhyamik Physical Science Question paper