Friday, March 7, 2008


(First Year – Year-Wise Scheme)

Part III – Physical Sciences


Time : 3 Hours (English Version) Max.Marks: 60

Note: Read the following instructions carefully.

1) Answer ALL questions of Section-A. Answer any SIX questions from Section-B and any Two

Questions in Section-C.

2) In Section-A questions from Serial Nos. 1 to 10 are of “Very Short Answer type”. Each question

Carries Two marks. Every answer may be limited to 2 or 3sentences. Answer all these questions

At one place in the same order.

3) In Section-B questions from Serial Nos. 11 to 18 are of “Short Answer Type”. Every question

Carries Four marks. Every answer may be limited to 75 words.

4) In Section-C questions from Serial Nos. 19 to 21 of Long Answer Type”. Each question carries

Eight marks. Every answer may be limited to 300 words.

5) Draw labeled diagrams wherever necessary for questions in Section in Sections B and C


Answer ALL questions.

1. The wavelength of radiation emitted by a sodium lamp is 600nm. Find its frequency.

2. “An atomic number increases, atomic size decreases in a period”. Give the reason for this behaviour .

3. Why H2O has higher boiling point than HF?

4. Calculate the oxidation number of manganese in KMn04 and MnS04.

5. Mention any two uses of heavy water.

6. Why does graphite act as Lubricant?

7. Mention the structure and hybridization of XeF4.

8. Why inert gas elements exhibit zero electron affinity?

9. What are the effects of acid rains?

10. Mention the names of two gases which cause holes in the ozone layer.


Attempt any six questions:

11. Define RMS velocity. Calculate the RMS velocity of oxygen at 300C.

12. State Graham’s law and deduce it form kinetic gas equation.

13. Chemical analysis of a carbon compound gave the following percentage composition. Carbon 70.59%.

Hydrogen 5.83% and the remaining is oxygen. The molecular weight is 136. Calculate it’s molecular


14. How does H202 react with the following? Give the equations.

a) Pbs b) KI c) acidified KMn04 d) 03

15. Explain the following reactions with an example each.

a) Wurtz reaction b)Friedal craft’s alkylation

16. Explain ‘position isomerism’ and ‘functional isomerism’ with an example each.

17. Explain the electrolysis of alumina and write the reactions which take place at anode and


18. Write the equations and the necessary conditions for sodium hydroxide to react with the


A) Cl2 b) NH4Cl c) Feso4 d) Co2


Attempt any TWO question

19.State the important postulates of Bohr’s theory based on these postulates. Explain the various spectral lines

In Hydrogen Spectrum.

20. What is periodic property? Define the following properties and explain how do they vary in a period and


a)Atomic radius

b) Ionization potential c)Electron affinity

21. What are Ionic and covalent bonds? Explain their formation with an example each. Give any Four

Differences between ionic and covalent compounds.

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