2014
PHYSICAL SCIENCE
(Bifurcated Syllabus)
(For Regular & External Candidates)
Time : 3 Hours 15 Minutes Full Marks :90 (for Regular Candidates)
(First fifteen minutes for :100 (for External candidates)
reading question paper only
and 3 hours for writing)
Special credit 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 ten questions from Groups
‘B’, ‘C’ and ‘D’ taking at least two from Group ‘B’ and at
least three from each of the Groups ‘C’ and ‘D’.
Besides this only the External Candidates will answer Group ‘E’.
Figures in the margin indicate full marks for each question.
Group ‘A’
1. Give very short answers to any ten questions. 1x10
1.1 What is the number of neutrons in 92U235 ?
1.2 How many groups are present in the long form of periodic table?
1.3 How many oxygen atoms are there in 1 mole of CO2 ?
1.4 What is gram molecular mass of nitrogen ? (N=14)
1.5 Where will the image of sun be formed by a convex lens with respect to the sun?
1.6 Between a thick and thin wore of copper of same length which wire has greater resistance ?
1.7 What is the boiling point of water in Kelvin scale at standard pressure ?
1.8 What is SI unit of electric power ?
1.9 Which gas is evolved by the reaction of common salt with concentrated H2SO4 ?
1.10 What is the difference in number of hydrogen atoms between an alkene and an alkyne having
the same number of carbon atoms ?
1.11 Which component is present in higher percentage in brass ?
1.12 Mention one use f acetylene.
1.13 Which acid produces brown fumes on heating ?
Group ‘B’
2.1 The atomic number of an element is 13; write electronic arrangement of its atom. 2
2.2 There are seven electrons in the outer most orbit of an atom of an element. What are its atomic
number and valency ? (Outermost orbit is M orbit) 1+1
2.3 State Charles’s law. At constant pressure the volume of a definite mass of a gas at 0C is doubled by heating. What will be its final temperature? 2+2
3.1 1H1, 1H2, 1H3 – what is the relation among them? In the nucleus of which of them there is no
neutron ? 1+1
3.2 What is absolute zero temperature ? What is its value in Celsius scale ? 2+1
3.3 What is the value of standard pressure ? How does the pressure of a gas depend on the motion
of a gas molecule ? 1+2
4.1 Define ion. How many types of ion are there? Write with example. 2+1+1
4.2 At a constant temperature the volume of a certain amount of gas is compressed to half of its initial volume by applying pressure. Calculate the increase in pressure. 2
4.3 SO3 is prepared by oxidizing SO2 with oxygen in presence of a catalyst. How many gram of SO2 will be required to produce 40 g of SO3 ? (O=16, S=32) 2
5.1.1 Define molecular mass in C-12 scale.
5.1.2 At STP n number of N2 molecules occupies a volume of v litre. What volume n/2 number of CO2 molecules will occupy at STP? 2+1
5.2 If the number of molecules present in 9 gram of water is n, what will be the number of molecules present in 44 gram of carbon dioxide ? [H=1, C=12, O=16] 2
5.3 What is molar volume of a gas ? What is its value at STP ? 2+1
Group ‘C’
6.1 Define specific heat.
