Question Paper
HSEB Old Question Paper of Physics
Year: 2069 (2012) | Class 11
Sub.Code :110 ‘A’ [Physics]
Candidates are required to give their answers in their own words as far as practicable.The figures in the margin indicate full marks.
Attempt all the questions.
- You may use the following values of physical constants wherever necessary.
- Specific gravity of steel= 7.8
- Latent heat of ice=80 calgm-1
- Latent heat of steam= 540 cal/gm
- Linear expansivity of glass= 1.8 X 10-6 K-1
- Volume expansivity of mercury= 1.8 X 10-4 K-1
Group ‘A’
1. Answer in brief any six questions. [6x2=12]
(a) How does the kinetic energy of a body change if its momentum is halved?
(b) If the sun some how collapsed to form a black-hole, what effect would this event have on the orbit of the earth?
(c) Can the direction of the velocity of a body be changed when its acceleration is constant?
(d) If A and B are non-zero vectors, is it possible for A X B and A.B both to be zero? Explain.
(e) In hot air ballooning, a large balloon is filled with air heated by a gas burner at the bottom. Why must the air be heated?
(f) A man drops his briefcase in an elevator but it does not fall to the floor.What can be concluded about the situation?
(g) An ice cube floats in a glass of water. When the ice melts, will the water level in the glass rise, fall or remain unchanged?Explain.
2. Answer in brief any two questions. [2x2=4]
(a) Frozen water pipes often burst, will a merucry thermometer break if the temperature of the thermometer is brought below the freezing point of mercury?
(b) If you add heat to an object, do you necessarily increase its temperature? Justify your answer.
(c) Why are the polar regions much cooler than the equitorial regions despite the fact that the polar regions are periodically tilted towards sun?
3. Answer in brief any one question. [1x2=2]
(a) Can a convex mirror ever form real image? Justify your answer.
(b) A large object when taken away from your eye appears smaller. Why?
4. Answer in brief any one question. [1x2=2]
(a) Why is it dangerous to take shelter under a tree during lightning?
(b) Can two electric lines of force ever intersect each other? Explain.
Group ‘B’
5. Answer any three questions. [3x4=12]
(a) State the parallelogram law of vector addition.Derive the expression for the magnitude and direction of the resultant of two vectors inclined at an angle H from each other.
(b) What is geo stationay satellite? Obtain an expression for the total energy of a satellite orbitting round the earth?
(c) State the principle of conservation of linear momentum.How does the Newton
(d) Derive an expression for the energy stored in a stretched rod.Define the term energy density of a body under strain.
6. Answer any two questions. [2x4=8]
(a) Define linear and cubical expansivities of solids. Derive an expression for the variation in density of solid when its temperature is raised from H1 oC to H2 oC .
(b) Define adiabatic process in thermodynamics. Show that: PVr=constant where symbols have their usual meanings.
(c) Describe the working of petrol engine with the help of P-V diagram.
7. Answer any one question. [1x4=4]
(a) What is long sightedness? Discuss the possible causes of long sightedness. Explain,how this defect can be remedied.
(b) Derive an expression for lens maker’s formula.
8. Answer any one question. [1x4=4]
(a) State Gauss Theorem. Use this theorem to find the electric field intensity due to a plane charged conductor.
(b) How can a number of capacitors be connected to increase and decrease the effective capacitance? Find the respective expressions for the effective capacitance in each case.
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