 The West Bengal Madhyamik Board Class 10 Physical Science 2019 Question Paper is considered the best resource for students who prepare efficiently for the board exams of Class 10. These Madhyamik question papers lay a proper foundation for the questions that are likely to be asked in the Physical Sciences exam. The West Bengal Madhyamik Board Class 10 Physical Science 2019 Question Paper is the best resource for students to prepare for the board exams.

Madhyamik Students can click on the links provided and download the unsolved question paper PDFs. Madhyamik Students can get the respective question paper’s printable format from the given link. Meanwhile, the questions are also published online on the webpage.

Madhyamik board Students are urged to get familiar with the key topics covered in the West Bengal Board Class 10 Physical Science textbook. The below given question paper is the perfect resource for students who want to get an overview of the question paper design of the WBBSE Class 10 Physical Science exam. Students are also advised to practise these previous year papers of West Bengal Board Class 10 Physical Sciences to thoroughly revise the subject. Referring to these questions will help them to self analyse their performance and preparation level for the board exams. The students can also solve these papers regularly to know how to answer the questions effectively.       ### West Bengal Madhyamik Board Class 10 Physical Science 2019 Question

Group-A

1. Multiple choice questions. Choose the correct answer from the 4 options given below.

[1 x 15= 15]

1.1 Which among the following gases absorbs long wavelength infrared radiation emitted from the earth’s surface?

a. N2

b. O2

c. CH4

d. He

1.2 At STP, 2.24 L is occupied by

[C=12, O=16, S=32]

a. 4.4 gCO2

b. 0.64 gSO2

c. 28 g CO

d. 16 g O2

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. Ɣ- ray

c. Infrared ray

d. Ultraviolet ray

1.6 In the 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 If the temperature remains constant when the potential difference between the two ends of a conductor is V, and the current through the conductor is I, then 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 β-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 compounds 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. NO2

b. NO3

c. N2O5

d. HNO3

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

a. Al2O3

b. Al2O3. H20

c. Al2O3.2H20

d. AlF3.3 NaF

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 questions (Alternatives are also given below)

2.1 Write down the unit of calorific value of fuel.

Or

Does the temperature increase or decrease with increase in altitude in the stratosphere?

2.2 Which radiation coming from the sun, is prevented by the Ozone layer from falling on the earth’s surface?

2.3 State whether the below given statement is true or false:

“The volume of gas molecules is taken into consideration in Avogadro’s Law.”

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

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.

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

2.7 How many rectangular surfaces are there in a prism?

2.8 Give an example of semi-conductor.

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?

2. 10 Mention one misuse of nuclear fission reaction.

Or

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

2.11 Match the left column with the correct answers from the right column [1 x 4=4]

 Left Column Right Column 2.11.1 oxide layer protects from attack by water vapour (a) Cu 2.11.2 Group 1 elements of the long periodic table having the least reducing property (b) Be 2.11.3 When the metals remain exposed to air, green patches develop on its surface (c) Al 2.11.4 Group 2 elements of the long periodic table having the least atomic radius (d) Li

2.12 Draw the Louis dot structure of N2 molecule.

(atomic number of N is 7)

Or

Write down the cathode reaction in the electrolysis of acid diluted water using platinum electrodes.

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

2.15 What colour is formed in the reaction of ammonia with Nessler’s reagent?

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

Or

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

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

2.18 What is the I.U.P.A.C name for CH3CH2COOH?

Or

What is the industrial source of CNG?

Group-C

3. Answer the given questions (alternative options are given) [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 410ml. Determine the molar mass of the gas.

(R=0.082 Litre atmosphere mole -1 K-1)

Or

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

3.3 What is a refractive index of a medium?

Or

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

3.4 Two resistance 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 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.

Group-D

4. Answer the questions below. Alternatives are given for some.

4.1 What is meant by molar volume of a gas? Mention two reasons for the deviation of real gases from the behaviour of ideal gases. [1+2]

4.2 How many grams of AI are required to prepare 558 g of Fe by the reduction of Fe2O3, with Al at high temperature? How many moles of Fe2O3 will be required in the reaction?

(Fe = 55.8, Al= 27, O =16) [2+1]

Or

By heating 32.1g ammonium chloride with calcium hydroxide 10.2 g NH3, 33.3G CaCl3 and 10.8 g H2O are obtained. How many grams of calcium hydroxide takes part in the reaction? How many moles of NH3 and how many litres of NH3, at STP is formed at the reaction? [1+2]

4.3 Which quantities remain fixed in the definition of volume expansion co-efficient of a gas? Name a non-metal, which is a good conductor of heat. [2+1]

Or

What is meant by ‘linear expansion coefficient of copper’ is 17×10-6 / °C? Why does the value remain the same even in kelvin scale? [2+1]

4.4 What type of mirror is used by dentists? Why does a ray of light not deviate as a result of refraction through a glass slab? [1+2]

4.5 When an object is placed 20 cm away from a convex lens, no image is obtained on either side of the lens. What is the focal length of the lens? If the refractive index of glass with respect to air is 1.5, what is the refractive index of air with respect to glass?

Or

The length of an object is 5 cm. An image of length 10 cm is obtained when it is placed at a distance of 2 cm in front of a convex lens. What is linear magnification and image distance? [1+2]

4.6 Write in brief the basic principle of hydroelectric power generation. 

4.7 A current of 1A flows when an electric bulb is connected to 220V mains. What would be the current when the same bulb is connected to a 110V main? 

Or

Find the ratio of resistances for two bulbs of 220V-60W and 110V-60W. 

4.8 Explain, why a new element is formed by α – particle emission, but no new element is formed by γ- ray emission from a radio active element [ 2+1]

Write Cl, Br, I, F in increasing order of their oxidising power.

Or

What is the important conclusion of Moseley’s experiment? What is the importance of this conclusion in regard to the periodic table?

4.10 Write two differences between the conduction of electricity through a metallic wire and an electrolyte during electrolysis. In electrolyte refining of copper metal, impure copper rod is used as which electrode? [2+1]

4.11 Write the names of chemicals used and balanced chemical equations in the industrial production of urea. 

4.12 (A) and (B) are two unsaturated hydrocarbons, each containing 2 carbon atoms. On reaction with bromines, (A) adds one molecule of bromine per molecule and (B) adds two molecules of bromine per molecule. Write the structural formula of (A) and (B). Write balanced chemical equation reaction of (B) with bromine. [1+2]

Write a balanced chemical equation of the reaction of sodium hydroxide with acetic acid.

Which one between jute and polyethene is environmental friendly for packaging and why?

Group- E

(Only for external candidates)

5. (Answer any 4 of the following questions) [1×4=4]

5.1. Give an example of a non-conventional energy with the help of which electricity can be generated.

5.2 Write the SI Unit of electric power.

5.3 Which acid is manufactured utilising catalytic oxidation of ammonia?

5.4 At STP an ideal gas occupies a volume of 273 cm3. What volume will the gas occupy at 76 cmHg pressure and at temperature of 273°C?

5.5 What is the functional group present in ethyl alcohol?

6. Answer any of the three questions from the following. [2×3=6]

6.1 What is a superconductor?

6.2 Mention one use of each of ultraviolet ray and gamma ray.

6.3 Write the name and formula of one ore of iron.

6.4 Write mentioning the product, how polymerisation reaction of ethylene is carried out.