Madhyamik Physical Science Question paper 2019

2019

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 among the following gases absorb long wavelength infrared radiation emitted from the earth’s surface?

(a) N(b) O   (c) CH4   (d) He

1.2   At STP, 2.24 L is occupied by

(a) 4.4 g CO2

(b) 0.64 g SO2

(c) 28 g CO

(d) 16g O2    [C=12, O=l6, S=32]

1.3   How many molecules of CO2 will be produced when 1 mole C reacts completely with 1 mole O2?

(a) 6.022 x 1023

(b) 1.806 x 1024

(c) 6.022 x 1022

(d) 6.022 x 1024

1.4   For a solid, how many types of thermal expansion coefficients are there?

(a) one

(b) two

(c) three

(d) four

1.5   Which one of the following has the highest wavelength?

(a) x-ray

(b)  γ-ray

(c) infrared ray

(d) ultraviolet ray

1.6  In case of refraction, if the angle of incidence and the angle of refraction are 45° and 30°respectively, then the angle of deviation is

(a) 75°   (b) 15°    (c) 7.5°    (d) 315°

1.7 Temperature remaining unchanged if the potential difference between the two ends of a conductor is V and the current through the conductor is I, which of the following is true?

(a) V∝I

(b) V∝I2

(c) V∝I-1

(d) V∝I-2

1.8 The relation among electromotive force (V), work (W) and charge (Q) is

(a) Q = WV

(b) Q = (V/W)

(c) Q = (V/W2)

(d) Q = (W/V)

1.9  For the atom produced by -particle emission from a radioactive atom

(a) mass number increases

(b) atomic number increases

(c) mass number decreases

(d) atomic number decreases

1.10  To which group of the long periodic table do the halogen elements belong?

(a) group 1

(b) group 16

(c) group 17

(d) group 2

1.11  Solid state of which of the following compound is composed of ions?

(a) sodium chloride

(b) hydrogen chloride

(c) naphthalene

(d) glucose

1.12  Which of the following has the highest ability to conduct electricity?

(a) pure water

(b) aqueous solution of sugar

(c) liquid hydrogen chloride

(d) aqueous solution of acetic acid

1.13 In the first step of fixation of nitrogen which of the following compounds is formed as a result of lightning

(a) NO(b) NO2   (c) N2O5     (d) HNO3

1.14  Which of the following is the formula of bauxite, ore of aluminium?

(a) Al2O3

(b) Al2O3.H2O

(c) Al2O3.2H2O

(d) AIF3.3NaF

1.15 Which of the following is the alkyl group containing two carbon atoms?

(a) methyl

(b) ethyl

(c) propyl

(d) isopropyl

Group B

2. Answer the following question (alternatives are to be noted) :

2.1  Write down the unit of calorific value of fuel? [1]

OR

Does the temperature increase or decrease with an increase in altitude in the stratosphere? [1]

2.2  Which radiation, coming from the sun, is prevented by the ozone layer from falling on the earth’s surface? [1]

2.3  State whether the following statement is true or false :

The volume of gas molecules is taken into consideration in Avogadro’s law. [1]

2.4  The product of volume and pressure of how many grams of N2 gas is 224 litre atmosphere at STP?  [N = 14]  [1]

2.5  State whether the following statement is true or false :

The constituent particles of a material change position during conduction of heat through it. [1]

OR

The width and the cross-section of a conductor remaining unchanged, what is the relation between the thermal resistance and thermal conductivity of that conductor? [1]

2.6  What will be the angle of incidence when a ray of light passes through the centre of curvature of a concave mirror? [1]

2.7  How many rectangular surfaces are there in a prism? [1]

2.8  Give an example of a semiconductor. [1]

2.9  A thin wire and a thick wire of the same conducting material have the same length. Which one of them will carry more current when connected to the same potential difference? [1]

2.10  Mention one misuse of the nuclear fission reaction. [1]

OR

Which law explains the release of a huge amount of energy in nuclear fusion? [1]

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

Left columnRight column

2.11.1 oxide layer protects from attack by water vapour

2.11.2 Group 1 elements of the long periodic table having the least reducing property.

2.11.3 When the metals remains exposed to air, develops green patches on its surface.

2.11.4 Group 2 elements of the long periodic table having the least atomic radius

(a) Cu

(b) Be

(c) Al

(d) Li

2.12  Draw the Lewis dot structure of N2 molecule. [1](atomic number of N is 7)

2.13  Which kind of electricity is used in electrolysis? [1]

OR

Write down the cathode reaction in the electrolysis of acidulated water using platinum electrodes. [1]

2.14  In electroplating gold on brass, what is the electrolyte used?  [1] 

2.15  What colour is formed in the reaction of ammonia with Nessler’s reagent. [1]

2.16  Write down the formula of the precipitate formed when H2S gas is passed through an aqueous solution of silver nitrate. [1]

OR

Write the name of the compound which is formed by the reaction of nitrogen with magnesium metal at a high temperature.  [1]

2.17  What is the value of H-C-H bond angle in methane? [1]

2.18  What is the IUPAC name of CH3CH2COOH. [1]

OR

What is the industrial source of CNG? [1]

Group – C

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

3.1  What is the concept of sustainable development?

3.2  1g of a gas at 7°C and 2 atmosphere occupies a volume of 410 mL. Determine the molar mass of the gas. (R 0.082 mm atmosphere mole-1 K-1)

OR

A fixed mass of gas occupies a volume of 273 cm3 at STP. At what pressure the above gas will occupy a volume of 300 cm3 at 27°C?

3.3  What is the refractive index of a medium?

OR

Which type of defect of vision is rectified by a convex lens?

3.4 Two resistances r1 and r2, when connected separately to the same potential difference, it was seen that the current flowing through r1 was six times the current flowing through r2. Determine the ratio of r1 and r2.

3.5  How did Kossel explain the formation of ionic bond?

OR

Liquid hydrogen chloride cannot conduct electricity, but molten sodium chloride can conduct electricity.-Explain.

3.6  Distinguish between sodium chloride and naphthalene by two physical properties.

3.7  Between two aqueous solutions, one is ferric chloride and the other is aluminium chloride. How would you identify the ferric chloride solution using an aqueous solution of ammonia? Answer with a balanced chemical equation.

3.8  Why zinc blend can be called both mineral and ore of zinc?

OR

Mention two ways of preventing rusting of iron.

3.9  Write with balanced chemical equation what happens when methane is burnt in oxygen.

OR

Mention one use of each of acetic acid and ethyl alcohol.

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