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PHYSICAL SCIENCE
(For Regular & External Candidates)
Only the External Candidates will answer Group ‘E’. Figures in the margin indicate full marks for each question.
Group ‘A’
(All Questions are Compulsory)
1: Multiple choice questions. Four alternative answers are given below for each of the following questions. Write the correct one. 1×15=15
1.1 The major constituent of Biogas is
(a) CH4.
(c) CO₂
(b) CFC
(d) CO
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
1.3 Number of moles present in 44.8 litre CO₂ at STP is
(a) 3
(b) 1
(c) 2
(d) 1.5
1.4 The value of the ratio of volume coefficient to pressure coefficient of an ideal gas is
(a)1/2 (b) 0 (c) 1/273 (d)1
1.5 The equation expressing 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
1.6 Magnified virtual image is formed by
(a) convex mirror
(b) convex lens
(c) plane mirror
(d) concave lens
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 defend upon the increase in length of the wire
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
1.9 The number of a and ẞ particles emitted in the reaction 86A222 → 84B210 would respectively be
(a) 6a, 3ẞ
(b) 3a, 4ẞ
(c) 4a, 3ẞ
(d) 3a, 6ẞ
1.10 If the elements are arranged in ascending order of their electropositivity, then choose the correct order
(a) C<N<O<F
(b) C>N>O> F
(c) O<N<C<F
(d) F>C> O>N
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: CI-2,8,7
(d) Na-2, 8, : CI-2, 8, 8
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
1.13 The gas which is identified by using Nessler’s reagent is
(a) NO₂
(b) H₂S
(c) HC1
(d) NH3
1.14 The metal which is extracted through thermal reduction is
(a) Ag
(b) Mg
(c) Fe
(d) Au
1.15 Identify the chemical reaction which yields chloroform
(a) CH₁ + Cl₂
(b) CH2Cl2 + Cl₂
(c) CH₂Cl₂ + Cl₂
(d) CHCl3 + Cl₂
GROUP-B
2. Answer the following questions (alternatives are to be noted): (each question carries 1 marks)
2.1 Chlorine atom (CI) destroys Ozone molecule (03) – show with the help of a chemical reaction.
2.2 In which layer of the atmosphere is the minimum temperature noted?
OR, In which layer of the atmosphere does the orbit of the International Space Station lie?
2.3 What is the nature of P vs 1/V graph?
2.4 Write down the correlation between absolute temperature and density of gas.
2.5 The coefficient of linear expansion of aluminium is 24* 106 °C. What would be its value in SI unit?
OR, From which law is the value of volume expansion coefficient of gas obtained?
2.6 State whether the refractive index of a medium would increase or decrease if the angle of incidence is increased.
2.7 Where is the image formed if the object is placed in between f and 2f of a convex lens?
2.8 What would be the equivalent resistance of a circuit containing resistances of 6Ωand 3Ω connected in parallel with 1Ω another resistance of 1Ω connected in series?
2.9 By which rule is the direction of rotation of Barlow’s wheel determined?
2.10 Mention one practical application of controlled chain reaction.
OR, Why is a nuclear fission conducted before a nuclear fusion?
2.11 Match the Right column with the Left column: 1×4-4
| LEFT COLUMN | RIGHT COLUMN |
| (1) Noble gas | (a) Cs |
| (2) Inver | (b) Rn |
| (3) Least electronegative element | (c) Reduction in carbon |
| (4) ZnO + C → Zn + CO | (d) An alloy |
2.12 KCI is soluble in which of water and benzene ?
2.13 In which electrode does oxidation take place during electrolysis of water?
OR, Which one between AC and DC is used in electrolysis?
2.14 Why does aqueous solution of HC1 gas conduct electricity?
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.
2.16 Which compound is used to prepare melamine?
2.17 Write down the names of two organic compounds with different functional groups designated by the formula C₂H6O.
2.18 Write down the structural formula of the principal constituent of LPG?
OR, Write down the structural formula of 1,1,2,2 tetra bromoethane.
GROUP-C
3. Answer the following questions (alternatives are to be noted): (each question carries 2 marks)
3.1 Write down the formula of Fire ice. How is methane gas obtained from it?
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?
OR, What will be the volume of 8 g of H2 gas (H = 1) at a pressure of 4 atmosphere and a temperature of 27°C? [R=0.082 litre atmosphere mole-1 K-1].
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°?
OR, Calculate the time required by a ray of light to traverse a glass slab of thickness 2 mm. Refractive index of glass =1.5.
3.4 Establish the relationship between internal resistance and EMF of an electric cell.
3.5 Define Octet rule. Give two examples of such compounds in which exception to Octet rule is observed.
OR, Write two important differences between ionic and covalent compounds.
3.6 Why is the formula weight appropriately used instead of the molecular weight in case of the ionic compounds?
3.7 Why is concentrated H₂SO4 not used to dry ammonia gas?
3.8 Why is dehydrated calcium chloride added during extraction of sodium through electrolysis of sodium chloride?
OR, Mention two ways of preventing rusting of iron.
3.9 What is denatured spirit?
OR Write one use each of Ethyl alcohol and Acetic acid.
GROUP-D
4. Answer the following questions (alternatives are to be noted): (each question carries 3 marks)
4.1 Mention a phenomenon by which it can be said that the gas molecules are in constant motion. Mention two incorrect postulates of Kinetic Theory of gas.
4.2 How much H2 is obtained when steam is passed over 21 g red hot iron? What would be the volume of that H₂ at STP? [Fe= 56].
OR, SO, is prepared by oxidizing SO, in presence of O2. How much SO, in gram will be required to produce 40 g of SO₂? [S= 32, O=16].
4.3 Define Thermal conductivity. What is the SI unit of Thermal resistance?
OR, Define volume expansion coefficient of a gas. Find its value from Charles’s law.
4.4 Write down the relationship between relative refractive Index and absolute refractive index. On which factors does the relative refractive index of a medium depend?
OR, Show that if a monochromatic light ray passes symmetrically through an equilateral prism then the angle of deviation of that ray will be minimum.
4.5 Define dispersion of light. How would you identify monochromatic light and composite light with the help of a prism?
4.6 The equivalent resistances of two conductors are 9Ω and 2Ω when they are connected in series and parallel combinations respectively. Find the resistances of those two conductors.
OR, Find the equivalent resistance between A and B points of the following circuit diagram.
4.7 Write down the difference between dynamo and electric motor. What is earthing?
4.8 Compare the charge, penetrating power and ionising power of a and y rays.
4.9 What is meant by ionisation energy of an atom of an element ?Arrange Na, Rb, Li and Cs in the increasing order of their ionisation energy.
OR, The atomic numbers of the elements ‘A’, ‘B’ and ‘C’ are (n -2), n, (n + 1) respectively. ‘B’ is an inert gas. In which group of the Periodic Table are ‘A’ and ‘C’ located? Which one among them has the highest reductive power? What is the formula of the compound produced by combining ‘A’ and ‘C’ ?
4.10 What is the purpose of Electro-plating? What electrolyte is used to plate gold on any substance?
4.11 Write the names of the chemicals used and the balanced chemical equation in the industrial production of urea.
4.12 Write down the reaction of the industrial production of Ethylene. Mention two uses of Ethylene.
OR, How is carbon tetrachloride produced by substituting the hydrogen atoms of methane by chlorine atoms in steps?
(For External Candidates Only)
GROUP-E
5. Answer the following questions (any four): 1×4=4
5.1 In which layer of the atmosphere the temperature is minimum?
5.2 What is the volume of 22 g CO2 at STP?
5.3 What is the SI unit of electric power?
5.4 What is the nature of the charge of y ray?
5.5 Mention one use of Acetic acid.
6. Answer the following questions (any three): 2×3=6
6.1 Explain the change of resistivity of conductor and semiconductor with change in temperature.
6.2 When does a convex lens behave as a concave lens?
6.3 Write the name and formula of one ore of copper.
6.4 Define resistance from Ohm’s law. What is the SI unit of resistance?
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