Madhyamik Physical Science Question paper (English version)
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 2019. Each paper started on each
day from 11.45 A.M to 3.00 P.M
Here is provided Physical Science question paper 2019. Full Marks is 90 for Regular candidates and 100 for the External Candidates. Time duration is Three Hours Fifteen Minutes.
2019
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”
1. Multiple choice questions. Four alternatives
are given as answer for each of the following questions. Write the correct
ones. 1x15=
15
1.1 Which
among the following gases absorb 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
(a) 4.4 g CO2 (b) .64 g SO2 (c)
28g 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) 6.022x1023 (b 1.806 x1024 (c)
6.022x1022 (d) 6.022x 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)
y-ray (c) infrared ray (d) ultraviolet ray
1 1.6
In case
of refraction, if the angle of incidence and the angle of refraction are
450 and 300 respectively, then the angle of deviation is
(a) 750 (b)
150 (c) 7.50 (d) 37.50
1.7 Temperature
remaining unchanged if the potential difference between two ends
of a conductor
is I, which of the following is true??
(a) V ἁ 1 (b)
V ἁ 12 (c) V ἁ 1-1 (d) V ἁ 1-2
1.8 The
relation among electromotive force (V) word (w) and change (Q) is
(a) Q = WV (b) Q= v/W2 (c) Q= V/W (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) NO (b)
NO2 (c) N2O5 (d) HNO3
1.14 Which of
the following is the formula of bauxite, ore of aluminum?
(a) Al2O3 (b) Al2O3 H2O (c) Al2O3 2H2O (d)
AlF3 3NaF
1.15
Which of
the following is the alkyl group containing two carbon atom?
(a) methyl (b)
ethyl (c) propyl (d)
isopropyl
Group-B
2.
Answer
the following questions. Alternative are to be noted.
Fill in
the blanks;.
2.1 Write
down the unit of calorific value of fuel? 1
Or
Does the temperature increases 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.
2.4 The
product of volume and pressure of how many gram of N gas is 224
litre
atmospheres at STP? 1
2.5
State
whether the following statement is true of 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?
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 following right column with left column.
1x4=4
A
B
2.11.1
Oxide layer protects from attack by water
vapour.
Cu
2.11.2
Group 1 element of the long periodic table
having the least reducing property
Be
2.11.3
When the metal remains exposed to air, the
metal slowly develops green patches on its surface.
Al
2.11.4
Group 2 element of the long periodic table
having the least atomic radius
Li
2.12
Draw the
Lewis dot structure of N2 molecule (atomic number of N is 7) 1
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.
2.17 What is
the value of H –C-H bond angle in methane? 1
Or,
Write the IUPAX name of CH3CH2COOH.
2.18 What is
the industrial source of CNG?
Group C
3.
Answer
the following questions 2x9=18
3.1
What is
the concept of sustainable development? 2
3.2 1g of a gas at 70C and 2 atmosphere
pressure occupies a volume of 410 m.l.
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 cm2 at STP. At what pressure
the above gas will occupy a
volume of 300 cm3 at 270C 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?
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 ration of r1 and r2
3.5 How did
the 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 aluminum
chloride. How would you identify the ferric chloride solution using aqueous
solution of ammonia? Answer with 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
happen when methane is burnt in
oxygen.
Or,
Mention one use of each of acetic acid
and ethyl alcohol.
Group D
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 behavior of ideal gases.
4.2 How many gram of Al is required to prepare 558
g 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, Al= 27, O= 16)
2+1
Or,
By
heating 32.1g ammonium chloride with calcium hydro oxide 10.2g NH3,
33g, CaCl2 and 10.8g H2O are obtained. How many gram of
calcium hydro oxide take part in the reaction? How many mole of NH3
and How many litre of NH3 at STP, are formed in the reaction. (N=14, H=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.
Or,
What is
meant by linear expansion coefficient of copper is 17x10 -6/0C?
Why does the value remain n 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?
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 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 5cm. an image of length 10cm is obtained when is placed
at a distance of 2cm in front of a convex lens. What is the linear
magnification and image distance?
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 main. What
would
be the current when the same bulb is connected to 110V mains?
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 ὰ particle
emission but no new
element is formed by y ray emission from a radioactive
element 2+1
4.9 Write
down Dobereiner’s law of triads. Arrange Cl, Br, I, F in increasing order
of
their oxidizing power
Or,
What is
the importance conclusion of Mosley’s experiment? What is the importance of
this conclusion in regard to periodic table?
4.10
Write
two differences between the conduction of electricity through a metallic
wire
and an electrolyte during electrolysis.
4.11
Write the
names of the chemicals used and balanced chemical equation in the
industrial
production of urea.
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 structural formula of (A)
and
(B). Write balanced chemical equation of reaction of (B) with bromine?
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
Group E
(For
External Candidate only)
5.
Answer
the following question: ( any four) 1x4=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 utilizing catalytic
oxidation of ammonia?
5.4 At ATP an ideal gas occupies a volume of 273cm3.
What volume will the gas
occupy at 76 cm.Hg pressure and at a temperature of
2730C?
5.5 What is
the functional group present in ethyl alcohol?
6.
Answer
the following questions: (Any three) 2x3=6
6.1 What is 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
polymerization reaction of ethylene is carried
out.
-------------------x---------------------
Here is provided Physical Science question paper 2019. Full Marks is 90 for Regular candidates and 100 for the External Candidates. Time duration is Three Hours Fifteen Minutes.
2019
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”
1. Multiple choice questions. Four alternatives
are given as answer for each of the following questions. Write the correct
ones. 1x15=
15
1.1 Which
among the following gases absorb 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
(a) 4.4 g CO2 (b) .64 g SO2 (c)
28g 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) 6.022x1023 (b 1.806 x1024 (c)
6.022x1022 (d) 6.022x 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)
y-ray (c) infrared ray (d) ultraviolet ray
1 1.6
In case
of refraction, if the angle of incidence and the angle of refraction are
450 and 300 respectively, then the angle of deviation is
(a) 750 (b)
150 (c) 7.50 (d) 37.50
1.7 Temperature
remaining unchanged if the potential difference between two ends
of a conductor
is I, which of the following is true??
(a) V ἁ 1 (b)
V ἁ 12 (c) V ἁ 1-1 (d) V ἁ 1-2
1.8 The
relation among electromotive force (V) word (w) and change (Q) is
(a) Q = WV (b) Q= v/W2 (c) Q= V/W (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) NO (b)
NO2 (c) N2O5 (d) HNO3
1.14 Which of
the following is the formula of bauxite, ore of aluminum?
(a) Al2O3 (b) Al2O3 H2O (c) Al2O3 2H2O (d)
AlF3 3NaF
1.15
Which of
the following is the alkyl group containing two carbon atom?
(a) methyl (b)
ethyl (c) propyl (d)
isopropyl
Group-B
2.
Answer
the following questions. Alternative are to be noted.
Fill in
the blanks;.
2.1 Write
down the unit of calorific value of fuel? 1
Or
Does the temperature increases 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.
2.4 The
product of volume and pressure of how many gram of N gas is 224
litre
atmospheres at STP? 1
2.5
State
whether the following statement is true of 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?
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 following right column with left column.
1x4=4
A
|
B
|
|
2.11.1
|
Oxide layer protects from attack by water
vapour.
|
Cu
|
2.11.2
|
Group 1 element of the long periodic table
having the least reducing property
|
Be
|
2.11.3
|
When the metal remains exposed to air, the
metal slowly develops green patches on its surface.
|
Al
|
2.11.4
|
Group 2 element of the long periodic table
having the least atomic radius
|
Li
|
2.12
Draw the
Lewis dot structure of N2 molecule (atomic number of N is 7) 1
2.13
Which
kind of electricity is used in electrolysis? 1
OR,
Write
down the cathode reaction in the electrolysis of acidulated water using
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.
2.17 What is
the value of H –C-H bond angle in methane? 1
Or,
Write the IUPAX name of CH3CH2COOH.
2.18 What is
the industrial source of CNG?
Group C
3.
Answer
the following questions 2x9=18
3.1
What is
the concept of sustainable development? 2
3.2 1g of a gas at 70C and 2 atmosphere
pressure occupies a volume of 410 m.l.
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 cm2 at STP. At what pressure
the above gas will occupy a
volume of 300 cm3 at 270C 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?
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 ration of r1 and r2
3.5 How did
the 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 aluminum
chloride. How would you identify the ferric chloride solution using aqueous
solution of ammonia? Answer with 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
happen when methane is burnt in
oxygen.
Or,
Mention one use of each of acetic acid
and ethyl alcohol.
Group D
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 behavior of ideal gases.
4.2 How many gram of Al is required to prepare 558
g 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, Al= 27, O= 16)
2+1
Or,
By
heating 32.1g ammonium chloride with calcium hydro oxide 10.2g NH3,
33g, CaCl2 and 10.8g H2O are obtained. How many gram of
calcium hydro oxide take part in the reaction? How many mole of NH3
and How many litre of NH3 at STP, are formed in the reaction. (N=14, H=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.
Or,
What is
meant by linear expansion coefficient of copper is 17x10 -6/0C?
Why does the value remain n 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?
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 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 5cm. an image of length 10cm is obtained when is placed
at a distance of 2cm in front of a convex lens. What is the linear
magnification and image distance?
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 main. What
would
be the current when the same bulb is connected to 110V mains?
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 ὰ particle
emission but no new
element is formed by y ray emission from a radioactive
element 2+1
4.9 Write
down Dobereiner’s law of triads. Arrange Cl, Br, I, F in increasing order
of
their oxidizing power
Or,
What is
the importance conclusion of Mosley’s experiment? What is the importance of
this conclusion in regard to periodic table?
4.10
Write
two differences between the conduction of electricity through a metallic
wire
and an electrolyte during electrolysis.
4.11
Write the
names of the chemicals used and balanced chemical equation in the
industrial
production of urea.
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 structural formula of (A)
and
(B). Write balanced chemical equation of reaction of (B) with bromine?
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
Group E
(For
External Candidate only)
5.
Answer
the following question: ( any four) 1x4=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 utilizing catalytic
oxidation of ammonia?
5.4 At ATP an ideal gas occupies a volume of 273cm3.
What volume will the gas
occupy at 76 cm.Hg pressure and at a temperature of
2730C?
5.5 What is
the functional group present in ethyl alcohol?
6.
Answer
the following questions: (Any three) 2x3=6
6.1 What is 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
polymerization reaction of ethylene is carried
out.
-------------------x---------------------
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