Madhyamik Physical Science Question paper 2016

2016

PHYSICAL SCIENCE

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

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 of the following questions : [1 x 10 = 10]

1.1. Which particle is present in equal number in 6C14 and 8O16?

1.2. What will be the difference of temperature of two bodies in the Kelvin scale if their temperature difference in Celsius scale is 10°?

1.3 What is the maximum number of electrons that can be present in the M shell of an atom?

1.4 What is the mass in gram of 2.24 litre of N2 at STP? (N = 14)

1.5. The mass and specific heat of a body are respectively m gram and s cal/g/°C. What is the water equivalent of the body in the CGS unit?

1.6 From which part of the atom is β-ray emitted?

1.7 What type of lens converts a parallel beam of light into a divergent beam?

1.8 What is the angle between the magnetic field and electric field in Fleming’s left-hand rule?

1.9 What type of chemical bond is present between oxygen and hydrogen atoms in water molecule?

1.10 Which is the most electronegative element?

1.11 Which gas is evolved when aluminium is heated with an aqueous solution of sodium hydroxide?

1.12 Write the formula of the precipitate formed when an aqueous solution of barium chloride is added to dilute sulphuric acid.

1.13 What is the number of hydrogen atoms in an alkane having n number of carbon atoms?

Group – B

2.1. The outermost shell of an atom of an element is M and it contains 6 electrons. How many electrons are there in K and L shell of the atom? If the number of protons and neutrons in the nucleus of the above atom is same, then what would be its atomic number and mass number of the atom. [1 + 1 + 1]

2.2. Write down the three postulates of Dalton’s atomic theory. [3]

2.3. If 20Ca40 and 17Cl37 form Ca2+ and Cl respectively, then the number of which two particles remain the same in the two ions? [2]

3.1. State Charles’ law and express it in mathematical form. [2 + 2]

3.2. How do the temperature and pressure of a gas depend on the motion of gas molecules? [2]

3.3. A gas of volume 91 cm3 at STP is heated to a temperature of 27°C. If the pressure is kept constant, what will be the volume of that gas at this temperature? [2]

4.1. The number of molecules in 1 mole is the same for the three compounds CO, C2H4 and NO. The number of molecules present in 1g is the same for two of the above compounds while it is different for the remaining compound. Identify the compound. Find out the number of molecules present in 1g of this compound. Which one of the three compounds has the maximum number of atoms in 1g of the compound? [2 + 1 + 1]
(H = 1, C = 12, N = 14, O = 16)

4.2. Write with an example of what is meant by gram atomic mass.        [2]

4.3. How many grams of magnesium oxide is produced when 24 gram of magnesium is completely burnt in oxygen? (Mg = 24, O = 16) [2]

5.1. What is meant by absolute zero temperature? What is the Kelvin scale of temperature? [2 + 2]

5.2. What is the number of oxygen atoms 22.4 L of CO2 at STP? [2]
5.3. A Cl ion is produced from and another Cl ion is produced from 17Cl35. The number of which particle is different in the two Cl ions ? What is the relation between 17Cl37 and 17Cl35? [1 + 1]

Group – C

6.1. Find the temperature at which the reading of Celsius and Fahrenheit scales will be the same. [2]

6.2. Define specific heat. [2]

6.3.1. What will happen when two bodies at different temperatures come in contact with each other? [2]

6.3.2. Write down the SI units of thermal capacity and water equivalent.  [2]

7.1.1 Is the lens of a magnifying glass convex or concave? [1]

7.1.2 What is meant by the optical centre of a convex lens ? [2]

7.2. What are pure and impure spectra ? Is rainbow a pure or an impure spectrum? [2 + 1]

7.3 If white light is passed through a prism, light of which colour is deviated most and light of which colour is deviated least ? [2]

8.1. What will be the length of the image when the length of the object is 5 cm and its linear magnification is 1. 5 ? [2]

8.2. What is meant by resistivity ? How does the resistance of a conducting wire depend on its diameter? [2 + 2]

8.3. If three resistances of 3 ohm, 4 ohm, and 5 ohm are connected to a cell in parallel combination, through which resistance will flow the highest current and through which resistance will flow the lowest current? [2 + 2]

9.1.1. The heat generated by the passage of electric current through a metallic conductor is 800 J. If the current is 1A and the resistance of the conductor is 20 ohm, determine the time for which electricity was passed through the wire. [2]

9.1.2. Mention two differences between potential difference and electromotive force. [2]

9.2. It is written ‘220V – 60W’ on a bulb What does it mean ? [2]

9.3. Explain why the household electrical appliances are connected in parallel Combination. [2]

10.1. What effects on the rotation of a Barlow’s wheel will be seen if (i) the position of the poles of the magnet is reversed (ii) current is Increased? [2]

10.2 Mention three ways by which the strength of an electromagnet can be increased. [3]

10.3.1 Name an instrument where an electromagnet is used. [1]

10.3.2 Why is ‘earthing’ necessary?                                    [2]

11.1. Why is diode called a valve? [2]

11.2. Mention the principle of production of X-rays. [2]

11.3.1. Arrange rays in increasing order of penetrating power. Which one has the highest electric charge? [2]

11.3.2. Mention two characteristic pf nuclear fission. [2]

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