Physical Science Question Paper 2017

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Group-A

1.Multiple choice question.

1.1 Which of the following is not a greenhouse gas?
(a) Methane
(b) water vapour
(c) carbon dioxide
(d) oxygen

1.2 Which of the following is the SI unit of pressure?
(a) Nm²
(b)Nm-²
(c) Nm
(d)N

1.3 Vapour density of a gas is 32. Which of the following is its molecular weight?
(a) 8
(b) 16
(c) 32
(d) 64

1.4 On which of the following does the thermal conductivity of a metal depend?
(a) Temperature
(b) length
(c) nature of the material
(d) area of cross section

1.5 What is the relation between the radius of curvature and the focal length of a mirror?
(a) f=2r 
(b) f=r/2
(c) f=r/3
(d) f=3/2 r

1.6 Which of the following colours deviates most when white light is refracted by a prism?
(a) red
(b) yellow
(c) violet
(d) green

1.7 Which of the following physical quantities represents ampere?
(a) coulomb-second
(b) volt/ohm
(c) volt-ohm
(d) ohm/volt

1.8 Resistivity of which of the following decreases with increase in temperature?
(a) conductor
(b) semiconductor
(c) super conductor
(d) insulator

1.9 Which of the following is the correct order of ionising power for α,β and γ rays?
(a) α>β>γ
(b) α>γ>β
(c) γ>β>α
(d) β>α>γ

1.10 Which of the following has the highest atomic radius?
(a) K
(b) H
(c) Li
(d) Na

1.11 In which of the following a covalent bond is present?
(a) Hydrogen chloride
(b) sodium chloride
(c) lithium hydride
(d) calcium oxide

1.12 Which of the following is a weak electrolyte in aqueous solution?
(a) CH3¬COOH
(b) NaOH
(c) H2SO4
(d) NaCl

1.13 Which of the following is used to dry moist ammonia?
(a) conc. H2SO4
(b) P2O5
(c) CaO
(d) CaCl2

1.14 Which of the following is an ore of aluminium?
(a) bauxite
(b) Haematite
(c) Malachite
(d) chalcopyrite

1.15 Which of the following is the functional group of aldehydes?
(a) -OH
(b) -CHO
(c) >C=O
(d)-COOH

                                 Group-B

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

2.1 In troposphere temperature ___ with increase in altitude.

Or, Mention one harmful effect of global warming.

2.2 Which atom is released from a chlorofluoro-carbon under the influence of UV rays, decomposes ozone oxygen?

2.3 Write whether the following statement is true or false

Under the same condition of temperature and pressure equal volumes of CO2 and N2 gas contain different number of molecules.

2.4 Write down the relation between the pressure and volume of a given mass of a gas according to Boyle’s law when temperature remains constant. 

2.5 Between apparent and real expansion coefficient of a liquid which one is its own characteristic?

Or, what is the SI unit of thermal conductivity?

2.6 Give a natural example of dispersion of light.

2.7 Which type of lens can rectify myopic vision?

2.8 What will be the change in the motion of a Barlow’s wheel if the direction of the current is reversed?

2.9 How much work has to be done when 1 coulomb of charge is taken against a potential difference of 1 volt.

2.10 From which part of a radioactive atom is β-particle emitted?

Or, what is the atomic number of the daughter element produced if an α-particle is emitted from 92238U?

2.11 Match the right column with the left column:

Right ColumnLeft Column
2.11.1) Transition elementa)Aluminium
2.11.2) Transuranium elementb)Nickel
2.11.3) Reduces Fe2O3 at high temperature in
thermite process
c)Tin
2.11.4) Present in alloy bell metald)Plutonium

2.12 Draw Lewis dot diagram of F2 molecule. (F=9)

2.13 Why the electrical conductivity of the solution produced by adding little sulphuric acid into pure water is more than the electrical conductivity of pure water?

Or, what are the carriers of electricity in the solution during the electrolysis of an aqueous solution of an electrolyte.

2.14 Which ion migrates towards the cathode during the electrolysis of aqueous solution of CuSO4 using Cu-electrodes.

2.15 Write down the formula of black precipitate formed when H2S gas is passed through an aqueous solution of lead nitrate?

Or, what change of colour is observed when H2S gas is passed through an acidified aqueous solution of potassium dichromate?

2.16 Two substances are used in the production of urea. One is ammonia, what is the other?

2.17 Mention one use of poly vinyl chloride.

2.18 Write down the IUPAC name of CH3CH2OH.

                                 Group-C

3. Answer the following questions.

3.1 What is meant by calorific value of a fuel? Between coal and diesel which has greater calorific value?

3.2 If the volume of a given mass of a gas at STP is 52m³ what will be its volume at the pressure of 104 cm Hg temperature remaining constant?

Or, what will be the volume of 8g of H2 gas (H=1) at the pressure of 4 atmosphere and temperature of 300K? 
(R=0.082 litre atmosphere 〖mol〗^(-1) K^(-1))

3.3 How does the refractive index of a medium depends on the velocity of light?

Or, what kind of mirror is used in the headlight of a car and why?

3.4 Mention two advantages of using a CFL lamp over a incandescent lamp.

3.5 An aqueous solution of sugar cannot conduct electricity, but an aqueous solution of sodium chloride can.Why?

Or, why is it appropriate to use the term formula weight instead of molecular weight in case of sodium chloride?

3.6 Compare the following two properties of naphthalene and sodium chloride: melting point and solubility in water.

3.7 Name a gas which can be prepared in Kipp’s apparatus. Write the balanced chemical equation of the reaction for the preparation of the gas.

3.8 How is metallic zinc is obtained from zinc oxide? Write reaction with balanced chemical equation.

Or, what happens when a piece of zinc is added to an aqueous solution of CuSO4? Show with the help of electronic theory that this is an oxidation-reduction reaction.

3.9 Show with the help of structural formula of ethylene that it is an unsaturated hydrocarbon.

Or, what is denatured spirit?

                                Group-D

4. Answer the following questions.

4.1 State Charles’ law related to gases and represent it graphically (V vs I). 2+1

4.2 How many grams of ammonium sulphate will be required to prepare 6.8 g of ammonia by heating ammonium sulphate with caustic soda solution? (H=1, N=14, O=16, S=32)

Or, CaCl2, CO2 and H2O are produced by the reaction of dilute HCl with CaCO3. How many grams of HCl will be required to prepare 55.5 g of CaCl2, 22.0 g of CO2 and 9.0 g of H2O from 50.0 g of CaCO3? What is the number of moles of HCl required? (H=1, Cl=35.5)

4.3 What is the volume expansion coefficient of a gas at fixed pressure? What is its value?

or, Mention two similarities between heat conduction and electrical conduction. Mention a non-metal having high thermal conductivity.

4.4 State the two laws of refraction of light. Write also the mathematical form of the second law.

4.5 In case of a concave mirror find the relationship between focal length and radius of curvature.

Or, A ray of light passes through a prism. Show that the angle of deviation (δ=i_1+i_2-A)

4.6 Write Faraday’s law of electromagnetic induction. What is meant by alternating current?

4.7 An electric bulb of resistance 440ohm is connected to 220-volt mains for 10 hours. Find the amount of electrical energy consumed in BOT unit.

Or, A metal wire of resistance 6 ohm is stretched so that its length become double of ts original length. What would be the final resistance?

4.8 What is meant by mass defect? What is the source of energy released in nuclear fusion?

4.9 write with an example what is meant by periodic property of elements? Mention a property which is not periodic.

Or, What is meant by electronegativity of an element? How does electronegativity of Group 1 elements of the long periodic table change from top to bottom?

4.10 Which energy is responsible for the chemical reaction to occur during electrolysis? What reactions do occur at the cathode and the anode during electrolysis of acidulated water?

4.11 Write balanced chemical equation with conditions for the industrial manufacture of SO3 from SO2 by the contact process. How is H2SO4 prepared from the SO3 produced?

4.12 Write balanced chemical equation of addition reaction of hydrogen with acetylene mentioning the conditions of reaction. Mention one use of LPG.

Or, How would you convert?
CH3 CH2 OH → CH2=CH2 

How is biopolymer protein biodegraded in nature?

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