Madhyamik Physical Science Question Paper 2019
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 2019. 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 2019.
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Physical Science 2019 |
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West Bengal Board Secondary Education
1. Multiple choice
questions. Four alternatives are given as answer for each of following
questions. Write the correct one.
1.1. Which among the following gases absorb long
wavelength infrared radiation emitted from the earth's surface?
(a)N2 (b) 02 (c)
CH4 (d)
He
(a) 4.4g Co2 (b) 0.64g SO2 (c)
28g CO (d) 16gO2 [Ć = 12,0
= 16, S = 32]
(a) 6.022 x 1023 (b) 1.806 X 1024 (c) 6.022 x 1022 (d) 6.022 x 1024
(a) one (b)
two (c) three (d) four
(a) x-ray (b)
Y-ray (c) infrared ray (d) ultraviolet ray
(a) 75° (b)
15° (c) 7.5° (d) 37.5°
(a) V∞ 1 (b)
V ∞ 12 (c) V ∞1-1 (d) Voc 1-2
(a) Q = WV (b)
Q=v/w (c) Q = v/w2 (d) Q = W/v
(a) mass number increases (b) atomic number increases
(c) mass number decreases (d) atomic number decreases
(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
(a) Pure water (b)
aqueous solution of sugar
(c) liquid hydrogen chloride (d) aqueous solution of acetic
acid
(a) NO (b)
NO2 (c) N2O5 (d) HNO3
(a) AL2O2 (b)
Al2O2H2O (c)
A1203.2H20 (d)
AIF3 .3NaF
(a) methyl (b)
ethyl (c) propyl (d) isopropyl
2. Answer the following
questions (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
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 gram of N, gas is 224 litro 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.
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 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 nuclear fission
reaction. 1
Or, which law explains the release of huge amount
of energy in nuclear fusion? 1
2.11. Match the right column with the left column: 1x4=4
|
Left
Column |
Right
Column |
|
2.11.1 . Oxide layer protects from attack by
water vapour |
(a) Cu |
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2.11.2. Group 1 element of the long periodic
table having |
(b) Be the least reducing property |
|
2.11.3. When the metal remains exposed to air,
the metal slowly develops green patches on its surface |
(c) Al |
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2.11.4. Group 2 element of the long periodic
table having the least atomic radius the least atomic radius. |
(d) Li |
2.13. Which kind of electricity is used in
electrolysis? 1
Or, Write down the cathode reaction in the
electrolysis of acidulated platinum electrodes.
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 Nessie action of ammonia with Nessler's reagent? 1
2.16. Write down the formula of the precipitate
formed when H2 S gas is passed through an aqueous solution of silver
nitrate. 1
Or, write the name of the compound which is formed
by the reaction or nitrogen with magnesium metal at a high temperature. 1
2.17. What is the value of h-C-H bond angle in
methane? 1
Or, Write the IUPAC name of CH3CH2COOH.
1
2.18. What is the industrial source of CNG? 1
3. Answer the following
questions (alternatives are to be noted): 2x9=18
3.1. What is the concept of sustainable
development? 2
3.2. 1g of a gas at 7°C and 2 atmosphere pressure
occupies a volume of 410 ml. Determine the molar mass of the gas. (R=0.082
litre atmosphere mole-1 K-1)
2
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? 2
3.3. What is the refractive index of a medium? 2
Or, Which type of defect of vision is rectified by
a convex lens? 2
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. 2
3.5. How did Kossel explain the formation of ionic
bond? 2
Or. Liquid hydrogen chloride cannot conduct
electricity, but molten sodium chloride can conduct electricity.- Explain. 2
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 balanced
chemical equation.
3.8. Why zinc blende 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.
4. Answer the following
questions (alternatives are to be noted):
4.1. What is meant by molar volume of a gas?
Mention two reasons for deviation of real gases from the behaviour of ideal
gases. 1+2
4.2. How many gram of Al is required to prepare
558g of Fe by the reduction of Fe2o2 with Al at high temperature?
How many mole of Fe2O3 will be required in the reaction?
[Fe = 55.8, AI = 27,0 = 16] 2+1
4.3. Which quantities remain fixed in the
definition of volume expansion coefficient 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?
4.4. What type of mirror is used by the dentists?
Why a ray of light does not deviate as a result of refraction through a glass
slab? 1+2
4.5. When an object is placed 20cm 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? 1+2
Or, The length of an object is 5cm. An image of
length 10cm is obtained placed at a distance of 2cm in front of a convex lens.
What are the linear magnifica tion and image distance? 1+2
4.6. Write in brief the basic principle of
hydroelectric power generation. 3
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 110V mains? 3
Or. Find the ratio of resistances for two bulbs of
220V-60W and 110V-OUW. 3
4.8. Explain why a new element is formed by ∞-particle
emission but no new element is formed by Y-ray emission from a radioactive
element. 1+2
4.9. Write down Dobereiner's law of triads. Arrange
Cl, Br, I, Fin increasing order of their oxidising power.
2+1
Or, What is the important conclusion of Moseley's
experiment? What is the importance of this conclusion in regard to periodic
table? 2+1
4.10. Write two differences between the conduction
of electricity through a metallic wire and an electrolyte during electrolysis. In
electrolytic refining of copper metal, impure copper rod is used as which
electrode? 2+1
4.11. Write the names of the chemicals used and
balanced chemical equation in the industrial production of urea. 3
4.12. (A) and (B) are two unsaturated hydrocarbons,
each containing 2 carbon atoms. On reaction with bromine, (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
of reaction of (B) with bromine. 1+2
Or Write balanced chemical equation of the reaction
of sodium hydroxide with acetic acid. Which one between jute and polyethene is
environment friendly for packaging and why? 2+1