Madhyamik physical science Question Paper 2022 Solve

WB Madhyamik physical science Solve

Madhyamik Pariksha 2022 Solve- physical science

SUBJECT: physical science Year: 2022

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Group A

Multiple choice questions. Alternative answers are given for each of the following questions. Write the correct one.

1.1 Which layer of the atmosphere has the greatest density?

(a) Troposphere

(b) Stratosphere

(c) Mesosphere

(d) Thermosphere

Ans. (a) Troposphere

1.2 mafara afueras fra fex (The P-V graph of Boyle’s Law related to gas is)

(a)

(b)

(c)

(d)

Ans. (b)

1.3 The relation between molecular mass (M) and vapor density (D) of gaseous substance is –

(a) 2M=D

(b) M = D²

(c) M=2.8 D

(d) M=2D

Ans. (d) M=2D

1.4 I the radius of curvature of a concave mirror is 20 cm. then the focal length of the mirror will be

(a) 20. cm

(b) 15 cm

(d) 40 cm

(c) 10cm

Ans. (c) 10 cm f = r/2 = 20/2 = cm

1.5 The wavelength of which of the following is greater than that of visible light?

(a) x-ray

(b) infrared by

(c) Y – ray

(d) ultraviolet ray

Ans. (b) infrared by

1.6 Dentists use

(a) convex mirror

(b) convex lens

(c) concave mirror

(d) concave lens

Ans. (c) concave mirror

1.7 Charge of an electron is

(a)-3.2×10C

(b)-1.6 10 C

(d) 3.2 × 10C

(c) 1.6×10- C

Ans. (b)-1.6 x 10C

1.8 If the resistance (R) of the conductor and time of flow of current in the conductor (t) remain unchanged, the relation between the heat produced (H) in the conductor and flow of current (I) is.

(a) H an l

(b) Ha 1/l²

(c) H an I²

(d) H an I²/I

Ans.(c) H a l²

1.9 (IT) 12C of charge flows through a conductor for 2 minutes, the electric current is

(a) (6 amperes) (b) (0.1 amperes)

(c) (24 amperes) (d) (10 amperes)

Ans. (b) (0.1 amperes) I=Q/t=12c/2mater=12/120=1/10=0.1

1.10 Number of groups in the long periodic table is

(a) 9 (b) 13 (c) 18 (d) 19

Ans. (c) 18

1.11 The order of oxidizing properties of C1 (17), F (9), and Br (35) belonging to

(a) F < Cl< Br< I

(b) Cl>l>F>Br

(c) Cl>F> Br>I

(d)F>Cl>Br>I

Ans. (d)F>Cl>Br>I

1.12 For the following ionic compounds no ion has octer.

(a) Lit (b) CaO (c) NaCT (d) MgCl₂

Ans. (a) LiH

1.13 The solid state of which of the following compounds is not composed of molecules?

(a) Sugar)

(b) Glucose)

(c) Sodium fluoride

(d) Hydrogen chloride

Ans.(c) Sodium fluoride

1.14 Acetic acid is a weak electrolyte because in an aqueous solution acetic acid is

(a) non-conductor of electricity

(b) completely dissociated

(c) Partially dissociated

(d) not dissociated

Ans. (c) Partially dissociated

1.15 During electrolysis)

(a) oxidation occurs at the cathode and reduction occurs t the anode

(b) oxidation occurs at both the electrodes

(c) reduction occurs at both the electrodes

(d) reduction occurs at the cathode and oxidation occurs at the ode.

Ans. (d) reduction occurs at the cathode and oxidation occurs at the anode.

Group ‘B’

Answer the following questions (Alternatives are to be noted):

2.1 (Mention one fuel that is an alternative to fossil fuel.)

Ans. Biogas, methen, ethanol, etc.

2.2 Write the name of a gas that increases the atmospheric temperature.

Ans. Greenhouse gas CO₂ or methane.

Or,

Fill in the blank:

_______ radiation, coming from the sun is prevented by the ozone layer from falling on the earth’s surface.)

Ans. Ultraviolet

2.3 What is the SI unit of the pressure of the gas?

Ans. Pascal or N/m².

2.4 What are the constants in Charles’ law?

Ans. Mass and pressure are constants.

Or,

Write whether the following statement is True or False.

per degree interval in the kelvin scale of temperature is equal to per the degree interval in the celsius scale.

Ans. True.

2.5 Is it possible to form a virtual image of a shorter length than the length of the object by any mirror?)

Ans. True.

2.6 Which type of mirror is used in the headlight of a motor car?

Ans. Concave mirror or Parabolic mirror.

2.7 If the refractive indices of a medium for red and blue colors of light are Ur and Ub respectively, which one is greater in magnitude?

Ans. The value of us will be greater.

2.8 What is the SI unit of electric charge?

Ans. Kumba.

2.9 What is the unit of electrical conductance?

Ans. mho ohm-¹

Or,

What are the constituents of fuse wire?

Ans. (Tin) and (Lead)

2.10 ‘Kilowatt-hour’ is the unit of I physical quantity?

Ans. Electrical Energy Electrical work.

2.11 Match the Right column with the Left column:

Left column

2.11.1 Acetic acid

2.11.2 Glass

2.11.3 Most electronegative element

2.11.4 One noble element

Right column

(a). nonconductor of electricity

(b) Weak electrolyte

(d) Fluorine

Ans. 2.11.1-(b), 2.11.2-(a), 2.11.3-(d), 2.11.4-(c).

2.12 Arrange F, I, Br, Clin decreasing order of electronegativity:

Ans. F, Cl, Br, I or F > Cl, > Br > I

(d) Fluorine

2.13 In which group of the long periodic tables, elements of all three physical states gaseous, liquid, and, solid are present?

Ans. Elements of group 17 or group 17 exist in all three states.

To which group of the long-period tables can the alkali metals belong?

Ans. (Gr 1)

2.14 Show the conventional representation of the H₂O molecule by the ‘dash’ sign.

Ans. H-O-H

2.15 The electronic configuration of a hydride ion (H^–) is like the electronic configuration of the atom of which element?

Ans. Similar to Helium (He).

Or,

Draw the Lewis dot diagram of H₂ molecule.

2.16 Give an example of a covalent liquid.

Ans. (Water)

2.17 Write whether the following statement is True or False 🙂

The electrical conductivity of solid NaCl is greater than the electrical conductivity of fused NaCl.

Ans. False.

2.18 What reaction occurs at the cathode in the electrolyte method of extraction of aluminum?

Ans. Reduction reaction 2A/+³+ 6e→2A/

Or,

Write whether the following statements are True or False 🙂 Free electrons carry electricity through electrolytic substances.

Ans. False.

Group C

Answer the following questions (alternatives are to be noted):

3.1 What is global warming?

3.2 (At a pressure of 770 mmHg a fixed mass of hydrogen gas occupies a volume of 75cm³ at 27°C. What volume will the mass of hydrogen gas occupy at that temperature and 750 mmHg pressure?)

Or,

What will be the volume of 64g of O₂ gas (O=16) at a pressure of 2 atmospheres and temperature of 300K?

(R 0.080.082-literosphere mol-¹ K-¹ )

3.3 Determine the angle of deviation for the refraction of light rays from rarer to denser medium.) (angle of incidence = I, angle of refraction = r)

Or,

Why do the green leaves of the trees appear ‘green’ in sunlight?)

3.4 Define the electromotive force of an electric cell in an open circuit.)

3.5 Why are the elements of group 2 of the long periodic table called alkaline earth metals?

Give an example of a transitional element and a transuranic element.

3.6 What type of chemical bond is present in NH₃? Draw Lewis electron dot diagram of NH₃.) The atomic number of H and N are I and 7 respectively

3.7 How is the Ionian c bond formed in sodium fluoride?

The atomic number of F and Na are 9 and 11 respectively

C has 4 electrons in its outermost shell and O has 6 electrons in its outermost shell. Draw the Lewis dot diagram of the CO₂ molecule.

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

3.9 What is meant by strong electrolyte?

Or,

What is meant by cathode and anode electrodes?

Group D

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

4.1 Establish the combined form of Boyle’s law and Charles’ law.

4.2 By the reaction of aluminum with 40 grams of metallic oxide and high temperature, 28 grams of the metal and 25.5 grams of aluminum oxide are produced. How many grams of aluminum are insured for the reaction?

The chemical equation for the reaction between sulphuric acid and sodium hydroxide is: H SO, + 2NaOH Na₂SO₄ + 2H₂O

4.9 How many grams of sodium hydroxide will be required to react completely with 4.9 grams of sulphuric acid?

(H=1,0=16, Na = 23, S = 32)

or,

4.3 A light is incident from air medium on another medium. If the refractive index of this medium is 1.5 and the wavelength of light in this medium is 4000A, what is the wavelength of light in the air medium? What is the velocity of the light in this medium?

As a result of the refraction of light through an equilateral prism the, angle of deviation becomes 40°. If the path of the ray through the prism is aisisallel to the base of the prism, determine the angle of incidence at the first surface of the prism.

4.4 Draw refracted rays for the incident rays which are parallel to the principal axis of a convex lens. Mark focus (F).

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 2em in front of a convex lens. What are the linear magnification and image distance?)

4.5 What is long-sightedness? What type of lens is used to remedy this defect?

4.6 If two electric bulbs of ratings 240V 50W’ and ‘2400-100W are connected in series, which one will shine brighter?

(Filaments of both the bulbs are of the same material)

or,

An electric cell of internal resistance 5Ω and emf 2V is connected to a resistor of 5Ω Q. Determine The potential difference between the two ends of the cell.

4.7 Which energy is transformed to which energy in an electric motor? Why are domestic circuits, and electric bulbs? electric fans, refrigerators, etc., are connected in parallel combination?

4.8 State Ohm’s law. If a potential difference of 10V is applied between the two ends of a conductor, an electric current of 0.1A flows. Determine the resistance of the conductor

or,

4.9 The first three elements of group 16 of the long periodic table are O, S, and Se. Arrange them in the order of decreasing atomic radius, increasing electronegativity, and decreasing ionization energy.

4.10 What type of chemical bond is present in MgCI₂? How are the chemical bonds formed in MgCl₂? (Atomic numbers of Mg and Cl are 12 and 17 respectively)

Explain why an aqueous solution of sodium chloride is the conductor of electricity but the aqueous solution of sugar or glucose is not.

4.11 What is electroplating? What is the cathode in the electroplating of silver over a copper material?

4.12 Write the reaction occurring at the cathode in the electrolysis of acidulated water using platinum electrodes. Why is acidulated water instead of pure water used for electrolysis?

Write the reactions occurring at the cathode and anode in the electrolysis of the aqueous solution of CuSO₄ using Cu-electrodes. What is used as an anode in refining impure copper metal by the process of electrolysis?