Madhyamik Class 10 Physical Science Solved Paper 2024

Multiple choice questions. Four alternative answers are given below each of the following questions. Write the correct one: [1 × 15 = 15]

Group – A

Question 1.1

The major constituent of Biogas is

(a) CH₄

(b) CFC

(c) CO₂

(d) CO

Question 1.2

A real gas behaves as an ideal gas at

(a) High pressure and high temperature

(b) High pressure and low temperature

(c) Low pressure and high temperature

(d) Low pressure and low temperature

Question 1.3

The number of moles present in 44.8 litres CO₂ at STP is

(a) 3 (b) 1 (c) 2 (d) 1.5

Question 1.4

The value of the ratio of the volume coefficient to the pressure coefficient of an ideal gas is

(a) 1/2

(b) 0

(c) 1/273

(d) 1

Question 1.5

The equation expressing the correlation between refractive index and wavelength of light is

(a) μ = A + B/λ

(b) μ = A + Bλ²

(c) μ = Aλ + B

(d) μ = A + B/λ²

Question 1.6

The magnified virtual image is formed by

(a) convex mirror

(b) convex lens

(c) plane mirror

(d) concave lens

Question 1.7

An electric current is flowing through a wire. If in this situation the wire is stretched to increase its length then the flow of current through the wire

(a) will increase

(b) will decrease

(c) will at first increase and then decrease

(d) will not depend upon the increase in the length of the wire

Question 1.8

If 5 ampere current is conducted for 30 seconds through any conductor then the total conducted charge would be

(a) 6 coulomb

(b) 150 coulomb

(c) 300 coulomb

(d) 30 coulomb

Question 1.9

The number of a and β particles emitted in the reaction ₈₆A²²² → ₈₄B²¹⁰ wouldrespectively be

(a) 6α, 3β

(b) 3α, 4β

(c) 4α, 3β

(d) 3α, 6β

Question 1.10

If the elements are arranged in ascending order of their electropositivity, then choose the correct order

(a) C < N < 0 < F

(b) C > N > 0 > F

(c) O < N < C < F

(d) F > C > O > N

Question 1.11

The electronic configuration of Na and Cl atoms in the compound NaCl is

(a) Na – 2, 8, 8 : Cl – 2, 8

(b) Na – 2, 8, 7 : Cl – 2, 8, 1

(c) Na – 2, 8, 1 : Cl – 2, 8, 7

(d) Na – 2, 8, : Cl – 2, 8, 8

Question 1.12

Decide which of the following statements is not correct regarding the conductance of electricity through electrolyte

(a) Chemical change occurs

(b) Conducts electricity in dissolved or molten state

(c) Resistance usually increases with the increase in temperature

(d) Electricity is conducted through ions

Question 1.13

The gas which is identified by using Nessler’s reagent is

(a) NO₂

(b) H₂S

(c) HCl

(d) NH₃

Question 1.14

The metal which is extracted through thermal reduction is

(a) Ag

(b) Mg

(c) Fe

(d) Au

Question 1.15

Identify the chemical reaction which yields chloroform

(a) CH₄ + Cl₂

(b) CH₃Cl + Cl₂

(c) CH₂Cl₂ + Cl₂

(d) CHCl₃ + Cl₂

Group – B

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

Question 2.1

Chlorine atom (Cl) destroys Ozone molecule (O3) – show with the help of a chemical reaction.  [1]

Question 2.2

In which layer of the atmosphere is the minimum temperature noted? [1]

OR

In which layer of the atmosphere does the orbit of the International Space Station lie ? [1]

Question 2.3

What is the nature of P vs 1/V graph? [1]

Question 2.4

Write down the correlation between absolute temperature and density of gas. [1]

Question 2.5

The coefficient of linear expansion of aluminium is 24×10^{-6 º}C^-1. What would be its value in the SI unit? [1]

OR

From which law is the value of the volume expansion coefficient of gas obtained? [1]

Question 2.6

State whether the refractive index of a medium would increase or decrease if the angle of incidence is increased. [1]

Question 2.7

Where is the image formed if the object is placed in between f and 2f of a convex lens ? [1]

Question 2.8

What would be the equivalent resistance of a circuit containing resistances of 6 Ω and 3 Ω connected in parallel with another resistance of 1 Ω connected in series? [1]

Question 2.9

By which rule is the direction of rotation of Barlow’s wheel determined? [1]

Question 2.10

Mention one practical application of controlled chain reaction. [1]

Or

Why is a nuclear fission conducted before a nuclear fusion ? [1]

Question 2.11

Match the right column with the left column:

Left Column	Right Column
(1) Noble Gas	(a) Cs
(2) Inver	(b) Rn
(3) Least electronegative element	(c) Reduction with carbon
(4) ZnO + C → Zn + CO	(d) An alloy

Question 2.12

KCl is soluble in which of water and benzene ? [1]

Question 2.13

In which electrode docs oxidation take place during electrolysis of water ? [1]

OR

Which one between AC and DC is used in electrolysis ? [1]

Question 2.14

Why does an aqueous solution of HCl gas conduct electricity?

Question 2.15

Write the name and formula of an organic fertiliser produced from ammonia. [1]

OR

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

Question 2.16

Which compound is used to prepare melamine ? [1]

Question 2.17

Write down the names of two organic compounds with different functional groups designated by the formula C₂H₆O. [1]

Question 2.18

Write down the structural formula of the principal constituent of LPG. [1]

OR

Write down the structural formula of 1, 1, 2, 2 tetrabromoethane. [1]

Group – C

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

Question 3.1

Write down the formula of Fire ice. How is methane gas obtained from it ?[1+1]

Question 3.2

A certain amount of gas occupies 750 cc at – 3°C. The gas is heated at constant pressure till its volume becomes 1 litre. What is its final temperature? [2]

OR

What will be the volume of 8 g of H₂ gas (H=1)at a pressure of 4 atmospheres and a temperature of 27°℃? [R=0.082 litre atmosphere mole^-¹K^-¹]. [2]

Question 3.3

At what angle must a light ray fall on the surface of an equilateral prism so that its angle of minimum deviation will be 20°? [2]

OR

Calculate the time required by a ray of light to traverse a glass slab of thickness 2 mm. The refractive index of glass=1.5. [2]

Question 3.4

Establish the relationship between internal resistance and EMF of an electric cell. [2]

Question 3.5

Define the Octet rule. Give two examples of such compounds in which an exception to the Octet rule is observed. [1+1]

OR

Write two important differences between ionic and covalent compounds.

Question 3.6

Why is the formula weight appropriately used instead of the molecular weight in the case of the ionic compounds?

Question 3.7

Why is concentrated H₂SO₄ not used to dry ammonia gas ? [2]

Question 3.8

Why is dehydrated calcium chloride added during the extraction of sodium through electrolysis of sodium chloride ? [2]

OR

Mention two ways of preventing the rusting of iron. [2]

Question 3.9

What is a denatured spirit? [2]

OR

Write one use each of Ethyl alcohol and Acetic acid. [2]

Group – D

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

Question 4.1

Mention a phenomenon by which it can be said that the gas molecules are in constant motion. Mention two incorrect postulates of the Kinetic Theory of gas. [1+2]

Question 4.2

How much H₂ is obtained when steam is passed over 21g red hot iron? What would be the volume of that H₂ at STP? [Fe=56] [2+1]