Madhyamik Physical Science Question paper 2015



Time – Three Hours Fifteen Minutes

(First fifteen minutes for reading the question paper only)

Full Marks – 90

(For Regular and Sightless Regular Candidates)

Full Marks – 100

(For External and sightless External Candidates)

Special credits will be given for answers which are brief and to the point.

Marks will be deducted for spelling mistakes, untidiness and bad handwriting.

Figures in the margin indicate full marks for each question.

Group A is compulsory. Answer 10 more questions from Group B, C and D taking at least 2 from Group B and at least 3 from each of the Groups C and D. Figures in the margin indicate full marks for each question.

(Group E is given only for External Candidates)

 Group – A

1. Give very short answers to any ten questions : [1 x 10 = 10]

1.1 What is the total number of charged particles in 20Ca40?

1.2 Express 327°C in Kelvin.

1.3 What is the number of molecules in 2.24 litre SO2 at STP?

1.4 What is the relation between 8O17 and 8O18?

1.5 Specific heat of which liquid is the highest?

1.6 In Fleming’s left hand rule the direction of which is indicated by the forefinger?

1.7 What type of lens is used to convert a parallel beam of light into a converging beam?

1.8 Write the name of the radioactive ray which has no charge.

1.9 To which group of Mendeleev’s periodic table do the alkali metals belong?

1.10 Which acid can be detected by the ring test?

1.11 Which type of chemical bond is present in hydrogen chloride molecule?

1.12 Write the name of an organic greenhouse gas.

1.13 How many hydrogen atoms are present in an alkyne containing three carbon atoms?

Group B

2.1 What is the nucleus of an atom? [2]

2.2.1 Write the name of two particles. present in the nucleus of an atom (except hydrogen atom). [2]

2.2.2 Why do the chemical properties of the isotopes remain the same? [2]

2.3 Why the electronic configuration of an atom having atomic number 12 can not be K(2), L(9), M(l)? What will be the electronic configuration of the atom?

3.1 State Boyle’s law and express it in mathematical form. [2 + 1]

3.2 Express the combined Boyle’s law and Charles’ law in the form an equation. What do the symbols used in this equation indicate? [2 + 1]

3.3 At 90 cm Hg pressure the volume of a fixed mass of a gas is 500 cm3.  What will be the volume of the gas at 60 cm Hg pressure at the same temperature? [2]       

4.1 State Avogadro’ s law and mention two of its deductions. [2 + 2]

4.2 Define atomic mass of an element m C-12 scale. [2]

4.3 How many grams of sulfur trioxide will contain the same number of molecules as present in 6.4 gram of sulfur dioxide? (0 = 16, S = 32) [2]

5.1 A bipositive ion is produced from an atom. Which particle will differ in number between the atom and the ion? In which this particle will be present in greater number and by how many? [2 + 1]

5.2.1 Whose unit is mole?

5.2.2 Write with example what is meant by gram molecular mass. [1 + 2]  

5.3 How many grams of (i) magnesium chloride (ii) hydrogen will be produced when 36 gram of magnesium reacts with excess dilute hydrochloric acid? (H=1, Mg =24, Cl = 35.5).  [2 + 1]

Group C

6.1 On what factors does the heat taken or given out by a body depend and how?  [3]

6.2 Write the fundamental principle of calorimetry.  [3]

6.3.1 Write SI unit of heat.

6.3.2 How much heat Will be required to raise the temperature of 250 g of water from 10°C to 100°C? [1 + 2]

7.1.1 What is called a convex lens?

7.1.2 What is meant by the focal length of a convex lens? [2 + 2]

7.2 Mention two differences between real and virtual image. [2]

7.3 What is called dispersion of light? [2]

8.1 What is linear magnification of image formed by a lens? [2]

8.2 State Ohm’s law. How is the definition of resistance obtained from this law?  [2 + 2]

8.3 In which combination are the three conductors of resistances 2 ohm, 3 ohm and 4 ohm to be connected so that the same current flows through each of them? Find the equivalent resistance of the combination.  [1 + 1]

9.1 On what factors does the heat produced due to the flow of electric current in a conductor depend and how? [3]

9.2 Name two instruments we use in daily life which utilize the heating effect of current. [2] 

9.3.1 Which one is the earth pin of a three-pin top?

9.3.2 Mention two characteristics of fuse wire. [1 + 2]

10.1 An electric current is Bowing through a wire. If a magnetic needle is placed under the wire parallel to it, the needle is deflected. Write the rule regarding the direction of deflection of the magnetic needle. [3]

10.2 What effect is observed on the rotation of a Barlow s wheel when

(i) strength of the magnet is increased

(ii) direction of electric current is reversed  [2]

10.3.1 What is an electromagnet?

10.3.2 The electromotive force of a cell is E volt. How much work is to be done when 1 coulomb of charge is taken from the positive pole to the negative pole of the cell?  [2 + 1]

11.1 What is called thermionic emission? [2]

11.2 Mention one property and one use of X-ray. [2]

11.3 1 What is natural radioactivity?

11.3 2 Mention two characteristics of nuclear fusion.  [2 + 2]

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