Madhyamik Physical Science Question paper 2017

2017

PHYSICAL SCIENCE

(New Syllabus)

Time – Three Hours Fifteen Minutes

(First fifteen minutes for reading the question paper only)

Full Marks – 90

(For Regular and Sightless Regular Candidates)

Full Marks – 100

(For External and sightless External Candidates)

Special credits will be given for answers which are brief and to the point.

Marks will be deducted for spelling mistakes, untidiness and bad handwriting.

Only the External Candidates will answer Group -E

Figures in the margin indicate full marks for each question.

Group – A

1. Multiple choice questions. Four alternatives are given as answer for each of the following questions. Write the correct one. [1 x 15 = 15]

1.1  Which of the following is not a greenhouse gas?

  1. methane
  2. water vapour
  3. carbon dioxide
  4. oxygen

1.2  Which of the following is the SI unit of pressure?

  1. Nm2
  2. Nm-2
  3. Nm
  4. N

1.3  Vapour density of a gas is 32. Which of the following is its molecular weight?

  1. 8
  2. 16
  3. 32
  4. 64

1.4  On which of the following does the thermal conductivity of a metal depend?

  1. temperature
  2. length
  3. nature of the material
  4. area of cross-section

1.5  What is the relation between the radius of curvature and the focal length of a minor?

  1. f = 2r
  2. f = (r/2)
  3. f = (r/3)
  4. f =  (2/3)r

1.6  Which of the following colours deviates most when white light is refracted by a prism?

  1. red
  2. yellow
  3. Violet
  4. green

1.7  Which of the following physical quantities represents ampere?

  1. coulomb-second
  2. volt-ohm-1
  3. volt-ohm
  4. volt-1 ohm

1.8  Resistivity of which of the following decreases with an increase in temperature?

  1. conductor
  2. semiconductor
  3. superconductor
  4. insulator

1.9  Which of the following is the correct order of ionising power for, and rays?

  1. α > β > γ
  2. α > γ > β
  3. γ > β > α
  4. β > α >γ

1.10  Which of the following has the highest atomic radius ?

  1. K
  2. H
  3. Li
  4. Na

1.11  In which of the following a covalent bond is present?

  1. hydrogen chloride
  2. sodium chloride
  3. lithium hydride
  4. calcium oxide

1.12  Which of the following is a weak electrolyte in aqueous solution?

  1. CH3COOH
  2. NaOH
  3. H2SO4
  4. NaCl

1.13  Which of the following is used to dry moist ammonia?

  1. conc. H2SO4
  2. P2O5
  3. CaO
  4. CaCl2

1.14  Which of the following is an ore of aluminium?

  1. bauxite
  2. hematite
  3. malachite
  4. chalcopyrites

1.15  Which of the following is the functional group of aldehydes?

  1. -OH
  2. -CH
  3. > C = O
  4. -COOH

Group B

2. Answer the following questions (Alternatives are to be noted)

2.1  Fill in the blank :

In troposphere temperature ______ with an increase in altitude. [1]

OR

Mention one harmful effect of global warming. [1]

2.2  Which atom, released from a chlorofluorocarbon under the influence of UV rays, decomposes ozone into oxygen? [1]

2.3  Write whether the following statement is true or false : [1]

Under the same condition of temperature and pressure, equal volumes of CO2 and N2 gas contain different number of molecules.

2.4  Write down the relation between the pressure and volume of a given mass of a gas according to Boyle’s law when the temperature remains constant. [1]

2.5  Between apparent and real expansion coefficients of a liquid which one is its own characteristic? [1]

OR

What is the SI unit of thermal conductivity? [1]

2.6  Give a natural example of dispersion of light. [1]

2.7  Which type of lens can rectify myopic vision? [1]

2.8  What will be the change in the motion of a Barlow’s wheel if the direction of the current is reversed? [1]

2.9   How much work has to be done when 1 coulomb of charge is taken against a potential difference of 1 volt? [1]

2.10  From which part at a radioactive atom is -particle emitted? [1]

OR

What is the atomic number of the daughter element produced if an α particle is emitted from 92U238? [1]

2.11  Match the right column with the left column : [1 x 4]

Left column Right column

2.11.1 A transition element

2.11.2 A transuranium elements

2.11.3 Reduces Fe2SO3 at high temperature in the thermit process.

2.11.4 Present in the alloy bell metal.

(a) Aluminium

(b) Nickel

(c) Tin

(d) Plutonium

2.12  Draw Lewis dot diagram of F2 molecule. (F = 9) [1]

2.13  Why the electrical conductivity of the solution produced by adding little sulphuric acid into pure water is more than the electrical conductivity of pure water? [1]

OR

What are the carriers of electricity in the solution during the electrolysis of an aqueous solution of an electrolyte?  [1]

2.14  Which ion migrates towards the cathode during the electrolysis of an aqueous solution of CuSO4 using Cu-electrodes. [1]

2.15  Write down the formula of the black precipitate formed when H2S gas is passed through an aqueous solution of lead nitrate? [1]

OR

What change of colour is observed when H2S gas is passed through an acidified aqueous solution of potassium dichromate. [1]

2.16  Two substances are used in the production of urea, One is ammonia, what is the other? [1]

2.17  Mention one use of poly (vinyl chloride). [1]

2.18  Write down the IUPAC name of CH3CH2CH2OH. [1]

OR

Write down the constitutional formula of an isomer of CH3CH2OH. [1]

Group – C

3. Answer the following question (Alternative are to be noted) : [2 x 9 = 18]

3.1 What is meant by the calorific value of a fuel? Between coal and diesel which has greater calorific value?

3.2 If the volume of a given mass of a gas at STP is 52 m3 what will be its volume at the pressure of 104 cmHg temperature remaining constant?

OR

What will be the volume of 8g of H2 gas (H=l) at the pressure of 4 atmosphere and temperature of 300K?

(R = 0.082 litre atmosphere mol-1 K-1)

3.3 How does the refractive index of a medium depend on the velocity of light?

OR

What kind of minor is used in the headlight of a car and why?

3.4 Mention two advantages of using a CFL lamp over an incandescent lamp.

3.5 An aqueous solution of sugar cannot conduct electricity, but an aqueous solution of sodium chloride can. Why?

OR

Why is it appropriate to use the term formula weight instead of molecular weight in case of sodium chloride?

3.6 Compare the following two properties of naphthalene and sodium chloride: melting point and solubility in water.

3.7 Name a gas which can be prepared in Kipp’s apparatus. Write the balanced chemical equation of the reaction for the preparation of the gas.

3.8 How is metallic zinc obtained from zinc oxide? Write the reaction with a balanced chemical equation.

OR

What happens when a piece of zinc is added to an aqueous solution of CuSO4? Show with the help of electronic theory that this is an oxidation-reduction reaction.

3.9 Show with the help of the structural formula of ethylene that it is an unsaturated hydrocarbon.

OR

What is denatured spirit?

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