Question 1.1
Which of the following is not a greenhouse gas?
(a) methane
(b) water vapour
(c) carbon dioxide
(d) oxygen
Question 1.2
Which of the following is the SI unit of pressure?
(a) Nm2
(b) Nm-2
(c) Nm
(d) N
Question 1.3
The vapour density of a gas is 32. Which of the following is its molecular weight?
(a) 8
(b) 16
(c) 32
(d) 64
Question 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
Question 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 = 2r/3
Question 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
Question 1.7
Which of the following physical quantities represents ampere?
(a) coulomb-second
(b) volt-ohm-1
(c) volt-ohm
(d) volt-1 ohm
Question 1.8
The resistivity of which of the following decreases with increase in temperature?
(a) conductor
(b) semiconductor
(c) superconductor
(d) insulator
Question 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
Question 1.10
Which of the following has the highest atomic radius?
(a) K
(b) H
(c) Li
(d) Na
Question 1.11
In which of the following a covalent bond is present?
(a) hydrogen chloride
(b) sodium chloride
(c) lithium hydride
(d) calcium oxide
Question 1.12
Which of the following is a weak electrolyte in aqueous solution?
(a) CH3COOH
(b) NaOH
(c) H2SO4
(d) NaCl
Question 1.13
Which of the following is used to dry moist ammonia?
(a) conc.H₂SO₄
(b) P₂O₅
(c) CaO
(d) CaCl₂
Question 1.14
Which of the following is an ore of aluminium?
(a) bauxite
(b) hematite
(c) malachite
(d) Chalcopyrites
Question 1.15
Which of the following is the functional group of aldehydes?
(a) -OH
(b) - CHO
(c) >C=O
(d) - COOH
Question 2.1
Fill in the blank:
In troposphere temperature ___ with increase in altitude. [1]
OR
Mention one harmful effect of global warming. [1]
Question 2.2
Which atom, released from chlorofluorocarbon under the influence of UV rays, decomposes ozone into oxygen?
Question 2.3
Write whether the following statement is true or false:
Under the same conditions of temperature and pressure, equal volumes of CO₂ and N₂ gas contain different numbers of molecules.
Question 2.4
Write down the relation between the pressure and volume of a given mass of a gas according to Boyle's law when the temperature remains constant.
Question 2.5
Between apparent and real expansion coefficients of a liquid which one is its own characteristic?
OR
What is the Sl unit of thermal conductivity?
Question 2.6
Give a natural example of the dispersion of light.
Question 2.7
Which type of lens can rectify myopic vision?
Question 2.8
What will be the change in the motion of a Barlow's wheel if the direction of the current is reversed?
Question 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 a particle is emitted from 92U238?
Question 2.11
Match the right column with the left column: [1 × 4]
| Left Column | Right Column |
| 1. A transition element. | (a) Aluminium |
| 2. A transuranium element. | (b) Nickel |
| 3. Reduces Fe₂SO3 at high temperatures in the thermit process. | (c) Tin |
| 4. Present in the alloy bell metal. | (d) Plutonium |
Question 2.12
Draw a Lewis dot diagram of the F2 molecule. (F =9)
Question 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?
Question 2.14
Which ion migrates towards the cathode during the electrolysis of aqueous solution of CuSO4 using Cu-electrodes.
Question 2.15
Write down the formula of the 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?
Question 2.16
Two substances are used in the production of urea, One is ammonia, what is the other?
Question 2.17
Mention one use of poly (vinyl chloride)
Question 2.18
Write down the IUPAC name of CH₃CH₂CH₂OH.
OR
Write down the constitutional formula of an isomer of CH₃CH₂OH.
Question 3.1
What is meant by the calorific value of a fuel? Between coal and diesel which has greater calorific value? [1 + 1]
Question 3.2
If the volume of a given mass of a gas at STP is 52 m³ what will be its volume at the pressure of 104 cm Hg temperature remaining constant? [2]
OR
What will be the volume of 8g of H2 gas (H=1) at the pressure of 4 atmospheres and temperature of 300 K? [2](R=0.082 litre atmosphere mol-1 K-1)
Question 3.3
How does the refractive index of a medium depend on the velocity of light?
OR
What kind of mirror is used in the headlight of a car and why?
Question 3.4
Mention two advantages of using a CFL lamp over an incandescent lamp.
Question 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 the case of sodium chloride?
Question 3.6
Compare the following two properties of naphthalene and sodium chloride:
melting point and solubility in water.
Question 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.
Question 3.8
How is metallic zinc obtained from zinc oxide? Write the reaction with a balanced chemical equation. [1 + 1]
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. [1 + 1]
Question 3.9
Show with the help of structural formula of ethylene that it is an unsaturated hydrocarbon.
OR
What is a denatured spirit?
Question 4.1
State Charles' law related to gases and represent it graphically (V vs T).
[2+1]
Question 4.2
How many grams of ammonium sulphate will be required to prepare 6.8 g of ammonia by heating ammonium sulphate with a caustic soda solution? [3]
(H = 1, N = 14, O = 16, S = 32)
OR
CaCl₂, CO₂ and H₂O are produced by the reaction of dilute HCl with CaCOs. 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? [2+1](H = 1, Cl = 35.5)
Question 4.3
What is the volume expansion coefficient of a gas at fixed pressure? What is its value?
[2+1]
OR
Mention two similarities between heat conduction and electrical conduction. Mention a non-metal having high thermal conductivity.[2 + 1]
Question 4.4
State the two laws of refraction of light. Write also the mathematical form of the second law.
[2+1]
Question 4.5
In the case of a concave mirror find the relationship between focal length and radius of curvature.
[3]
OR
A ray of light passes through a prism. Show that the angle of deviation δ = i₁+i₂- A (Symbols have usual meaning).[3]
Question 4.6
Write Faraday's laws of electromagnetic induction. What is meant by alternating current?
[2+1]
Question 4.7
An electric bulb of resistance 440 ohm is connected to 220-volt mains for 10 hours. Find the amount of electrical energy consumed in the BOT unit.
[3]
OR
A metal wire of resistance 6 ohm is stretched so that its length becomes double its original length. What would be the final resistance?[3]
Question 4.8
What is meant by mass defect? What is the source of energy released in nuclear fusion?
[2+1]
Question 4.9
Write with an example of what is meant by the periodic property of elements. Mention a property which is not periodic.
[2+1]
OR
What is meant by the electronegativity of an element? How does the electronegativity of Group 1 elements of the long periodic table change from top to bottom?[2+1]
Question 4.10
Which energy is responsible for the chemical reaction to occurs during electrolysis? What reactions do occur at the cathode and the anode during the electrolysis of acidulated water?
[1+2]
Question 4.11
Write a 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?
[2+1]
Question 4.12
Write a balanced chemical equation of the addition reaction of hydrogen with acetylene mentioning the conditions of reaction. Mention one use of LPG.
[2+1]
OR
How would you convert CH3CH2OH to CH2=CH2? How is biopolymer protein biodegraded in nature?[2+1]
Question 5.1
What is the main component of biogas ?
(For External Candidates)
Question 5.2
What is the Sl unit of electric charge?
(For External Candidates)
Question 5.3
How many elements are there in the third period of the long periodic table?
(For External Candidates)
Question 5.4
What is the radioactive ray that is not made up of particles?
(For External Candidates)
Question 5.5
What is the industrial source of CNG?
(For External Candidates)
Question 6.1
What is the absolute scale of temperature?
(For External Candidates)
Question 6.2
Mention two advantages of AC over DC
(For External Candidates)
Question 6.3
Write with a balanced chemical equation what happens when an aqueous solution of ammonia is added to an aqueous solution of ferric chloride.
(For External Candidates)
Question 6.4
Write with a balanced chemical equation what happens when methane undergoes combustion in oxygen?
(For External Candidates)
Question 1.1
Which of the following greenhouse gasses has the maximum contribution towards global warming?
(a) N2O
(b) CH4
(c) CO2
(d) H2O vapour
Question 1.2
According to Boyle’s law which is the PV vs P graph?
Question 1.3
If the vapour density of a carbon-containing gaseous substance is 13, which of the following can be its molecular formula?
(a) CO2
(b) C2H4
(c) C2H6
(d) C2H2
Question 1.4
The unit of coefficient of linear expansion of a solid is
(a) m
(b) M-1
(c) °C-1
(d) °C
Question 1.5
An object is placed in between the optical centre and the focus of a thin convex lens. What is the nature of the image of the object?
(a) real and inverted
(b) virtual and inverted
(c) real and erect
(d) Virtual and erect
Question 1.6
When a ray of light is incident perpendicularly on a transparent glass slab, what will be its angle of deviation?
(a) 0°
(b) 180°
(c) 30°
(d) 90°
Question 1.7
Which of the units given below is the SI unit of resistance?
(a) volt
(b) ampere
(c) Coulomb
(d) ohm
Question 1.8
In a domestic electric circuit, the fuse wire is connected to which of the following?
(a) Earth line
(b) live line
(c) neutral line
(d) both live and neutral line
Question 1.9
β-ray emitted from a radioactive element is
(a) a stream of electrons
(b) a stream of protons
(c) a stream of neutrons
(d) electromagnetic wave
Question 1.10
How many groups are in the long periodic table
(a) 7
(b) 8
(c) 9
(d) 18
Question 1.11
In formation of which of the following compounds octet rule is not obeyed?
(a) NaCl
(b) LiH
(c) KCl
(d) CaO
Question 1.12
Which of the following can conduct electricity?
(a) molten NaCl
(b) liquid HCl
(c) solid NaCl
(d) aqueous solution of glucose
Question 1.13
What will be the colour of the resulting solution when excess aqueous ammonia is added to an aqueous solution of copper sulphate?
(a) Yellow
(b) Green
(c) deep blue
(d) Brown
Question 1.14
In which of the following alloys is zinc present?
(a) bell metal
(b) Brass
(c) Bronze
(d) Duralumin
Question 1.15
Which of the following is a saturated hydrocarbon?
(a) C3H6
(b) C2H4
(c) C2H2
(d) C2H6
Question 2.1
Mention one use of biogas.
Question 2.1 OR
What is the role of NO in the decomposition of ozone in the ozone layer?
Question 2.2
Among charcoal, petrol and ethanol which one is a fossil fuel?
Question 2.3
Under constant pressure at what temperature in degrees Celsius the volume of an ideal gas will be 0 according to Charles’ law?
Question 2.4
What is the unit of M in the equation PV=W/M RT? (symbol has usual meaning)
Question 2.5
Whether the following statement is true or false?
The real expansion of any liquid depends on the expansion of the vessel in which it is kept.
OR
Among iron, invar and copper which one has the least coefficient of linear expansion?
Question 2.6
Between the angle of incidence and the angle of refraction which one is greater when light travels from a rarer to a denser medium?
Question 2.6
What type of mirror is used in the viewfinder of a motor car?
Question 2.7
What type of mirror is used in the viewfinder of a motor car?
Question 2.8
How does the resistance of semiconductors change with the increase in temperature?