Winter-Break Holiday-Homework

Session 2014-2015

Class-XII (Geography)

1) Fill in the map

India in world

2) Revision work 1 mark question 3 mark question and 5 mark question from

text book.

Books: Fundamentals of Human Geography

India: People and Economy

MLL XII ECONOMICS

FOR WINTER BREAK

Q.1 How many has solved the problems of Barter System?

Q.2 Explain the process of money creation.

Q.3 What are the main functions of RBI?(Any four)

Q.4 Explain the main functions of money.

Q.5 What are the main objectives of Govt. Budget.

Q.6 Distinguish between capital expenditure and revenue expenditure.

Q.7 Distinguish between capital receipt and revenue receipt.

Q.8 Define – Fiscal deficit, Revenue Deficit and Primary Deficit.

Q.9 Define capital account of BOP. Explain its components.

Q.10 Define current account of BOP. Explain its components.

Q.11 Distinguish between autonomous and accommodating items of

BOP.

Q.12 How is flexible rate of exchange determined.

Q.13 Define currency appreciation and currency depreciation.

Q.14 Explain the law of variable proportion with diagram and table.

Q.15 Explain the chain reaction of consumer when income rise.

Q.16 Distinguish between change in supply and change in Q.supplied.

Q.17 Explain the concept of producers equilibrium with MR and MC?

Q.18 Explain three central problems of the economy?

Q.19 What are the main features of oligopoly?

Q.20 Give implications of :- large numbers of buyers and sellers, free

entry and exit of firms, homogeneous product and differentiated

product.

Q.21 Explain factors affecting supply of commodity.

Q.22 What are the simultaneous effect of changes in demand X supply?

Q.23 What are the factors affecting demand of a commodity.

Q.24 Explain consumer’s equilibrium with the help of utility approach?

Q.25 Explain consumer’s equilibrium with the help of IC approach.

Q.26 What is the relation between TR, AR and MR.

Q.27 Explain the concept of investment multiplier.

Q.28 What is PPC? Why it is concave to origin.

Q.29 How is equilibrium level of income and output determined with

the help of AD and AS?

Q.30 How is equilibrium level of income and output determined with

the help of saving and investment.

HOLIDAYS HOMEWORK

CLASS 12 ENGLISH 2014-15

1. Solve all the three sets of the pre board-1 provided to you by the vidyalaya individually.

2. Answer the following questions:-

1. How did the death of Griffin’s father reveal the ugly aspect of Griffin’s personality?

2. What was Griffin’s state of mind after his father’s death?

3. Describe the Encounter of Griffin & the land lord at the Great Portland street?

4. Describe any 2 comical situations that resulted from Griffin’s invisibility?

5. Describe how Griffin manages to get into the Hunch Man’s house? Why did he enter

it?

6. What were the different advantages of invisibility enumerated by Griffin?

7. Kemp had laid a well-planned trap for Griffin to walk in. Still how did Griffin manage

to escape?

8. Why did Griffin leave Kemp’s house in a great fury? How did he express his anger?

9. How and why was Wicksteed murdered?

10. What precautions did Kemp take on reading the letter sent to him by Griffin?

11. Why did the policeman call Dr. Kemp “hero”?

12. How did the invisible man meet his end?

13. Why does H.G. Wells call the experiment of the invisible man “Strange and Evil”?

14. Why did Marvel name his inn “The invisible man”?

15. Justify the title of the novel “The invisible man” .

Hindi १. परथम परी-बोरड परीा -२०१४ क अनय दो सट को( जो

परीा म ककया ह, उसक अतिररकि ) पणिया करना ह.

Maths Class-XII

1) Solution of sample papers prepared during sirsa – 3days workshop

which are uploaded on the school website.

PHYSICS

CLASS- XII

SAMPLE PAPER 1

Each questions carry one marks only.

Q.1 Identify the type of magnetic material which has permeability equal to 0.99876.?

Q.2 If focal lengths of two lenses are +40cm and -20cm. what is the power of combination.?

Q.3 The maximum kinetic energy of ejected photoelectron is 5ev. What is stopping potential.?

Q.4

Whether value of resistance ‘R’ to increased/decreased on kept constant in ckt(circuit).If the

semi conductorin ckt is being heated.

Q.5 Define Transducer?

Each Questions carry 2 marks.

Q.6(a) What are equipotential surfaces.?

(b) Draw equipotential surfaces for two equally positive charges separated by some

distance.?

Q.7 The V-I graph for an alloy is drawn at two temperatures T1&T2. Which temperatures is

higher and why?

Q.8 Derive the expression for force per unit length on current carrying wires kept parallel to

each other in vaccume.

Q.9 What are eddy currents? Write their two applications?

Q.10 Write truth table for NAND GATE & Draw output waveform.

NAND GATE for INPUT as shown:

OR

Draw the truth table for the given Network. Name the Gate formed by combination &Draw its

symbol.

Each question carries 3 marks.

Q.11 Find the expression for electric field due to uniformly positively charged spherical shell at

(i) r>a

(ii) r<a

Where ‘r’ is distance of point from center of shell and ‘a’ is radius of shell.Also give direction of

field?

Q.12 (a) how will you convert a galvanometer into an ammeter?

(b) If full scale deflection current for a galvanometer is 0.2A. what should be value of shunt

resistance to make it an ammeter of range (0-3A). The resistance of galvanometer is 50 .

Q .13 Write three differences between diamagnetic, paramagnetic &ferromagnetic material .?

Q.14 Identify the type of electro magnetic waves on the basis of of their wavelength given

below. Also write one use of each wave .

(i)400nm to 0.6 nm

(ii)700nm to 400 nm

(iii) 10 m to 10 m.

Q.15 Write two essential conditions for sustained interference pattern to be produced on

screen (1)

Draw a graph showing the variation of intersity verses the position in young’s experiment for

(i)both the slits are opened(1)

(ii)only one slit is opened(1)

Q.16 Draw a neat labeled diagram for the formation of image in compound microscope derive

the expression for its magnifying power.(2+1).

Q 17 A biconvex lens is made up of a material of retractive index 1.5.The redii of curvature of

each surface is equal and 20cm. What is the focal length of the lens in the air?

If the lens is immersed in a liquid of retractive index 4/3, What will be change in its focal length?

Q18: The maximum kinetic energy verses frequency graph for two photosensitive metals ‘A’

and ‘B’ is shown here.

Tell on the basis of graph :

(i)Which metal has greater work function?

(ii)Which has greater throshold wavelength?

(iii)What does the slope of curve depict?

Justify your answer in each case.

OR

Write Eientien’s equation of photo electric effect and explain laws of photo electric effect on its

basis.

Q19 Draw binding energy per nucleon curve with mass number and explain on its basis that –

The energy is released in nuclear fission.

What does the constancy of binding energy per nucleon for mass number (A) Greater than 56,

indicate?

Q20 The energy levels of an atom of element are shown in the figure.Which one of the

transition will correspond to wavelength 620nm? Support your answer with mathematical

calculations.

Q21(a) What do you mean by GPS? What is its full form? How many satellites are needed for a

GPS system to cover whole earth?(1+1/2+1/2).

(b) Define LOS and write its formula.(1/2+1/2).

Q22. A wire having uniform cross- section is turned into a circular loop if radius R. For any angle

‘Q ‘ between points A and B JOINING the centre O, Show that magnetic field at the center of the

circle is zero irrespective of the value of the angle.

A B

Q23 Kavya’s friend somya wanted to purchase a pair of goggles.Kavya advised to purchase

polaroid goggles. She explained its advantages over other glasses.

(a)what are qualities displayed by Kavya?(1)

(b) what is a polaroid?(1)

(c) why the polaroid goggles better?( write at least two properties).(2)

Q24 (A)Statekirchoff’s laws of electrical circuit.(2)

(b)Find the current in each branch of the given circuit. 3

OR

(a)State the principle of potentiometer. Draw labeled circuits diagram for determining the

internal resistance of a primary cell by potentiometer.(1+1)

O

θ

(b) from the above circuits determine:

(a) The potential Gradient(1)

(b) The balancing length(1)

(c) What would happen to null point J IF the value of resistance R is increased.(1).

Q 25 (a) State the principle of cyclotron and draw its neat labeled diagram.(1+1)

(b) calculate net force and torque on current carrying loop PQRS, as shown in figure.

OR

(a) What do you meant by resonance in LCR,a.c circuit(1)

(b) From the following circuit diagram determine:

(i) The frequency of a.c source which derives the circuit in resonance

(ii) The impledance of circuit at resonance (1)

(iii) The peak current at resonance(1)

(iv) Quality factor Q (1)

Q26 (A) Explainthe working of n-p-n

Transistor as an amplifier with the help of neat circuit diagram .(3)

(c) A pure silicon crystal has 5x1028 atoms per metercube. It is dopped by 1ppm

concentration of As. Calculate the number of electrons and hole per metercube Given

ni=1.5x10

OR

(a) Draw the circuit diagram of p-n-p transistor in CE (Common- Emitter) Configuration to

study its characteristics.Draw its input characteristics .

(b) A Transistor has current amplification factor of 50 .in common –emitter configuration

The collector resistance is 5k and input resistance is 1k .calculate the output

Voltage for input voltage 0.01V.(2).

SAMPLE PAPER 2

Q1. Draw a graph showing the variation of Potential(V) and Electric Field€ due to point charge Q as a function of distance r from point charge.

Q2. Two conducting wires x and y of same diameter but different materials are joined in series across battery. If the no density of electrons in x is twice that in y. Find the ratio of drift velocity of electrons in the two wires.

Q3. Why should the material used for making permanent magnets have high corcivity? Q4. Two nuclei have mass no in the ratio 2:5 What is the ratio of their nuclear densities? Q5. State the reason,Why two independent sources of light cannot be considered as coherent sources? Q6. A sphere radius r1 encloses a charge Q. If there is another concentric sphere of radius r2(r2>r1)

and there be no additional charges between s1 & s2.Find the ratio of electric flux through s1 & s2. Q7. Define self-inductance of a coil. The power factor of an ac circuit is 0.5.what will be phase difference voltage & current in the circuit.

OR

A bulb B and capacitor of capacitance C are connected in series to the AC mains as shown above the bulb glows with some brightness. How will the brightness of bulb change when dielectric slab is introduced between the plates of capacitor? Justify your answer. Q8. A plot between angle of deviation (δ ) and angle of incidence(i) for a triangular prism.

a) Give reason why angle of deviation corresponds to two values of angle of incidence b) Also discuss the importance of point P

Q9. What is space wave propagation? Which two communication method makes use of this mode of propagation? Q10. Draw biasing circuit of LED and photodiode. Q11. Write the two factors on which the sensitivity of a potentiometer depends.

In the potentiometer circuit shown above the balance point is at X from end. State giving reason how the balance point is shifted when

(i) Resistance R is increased (ii) Resistance S is increased

Keeping R constant Q12. Define relaxation time of the free electrons drifting in a conductor. How is it related to the drift velocity of free electrons? Use their relation to deduce the expression for the electrical resistivity of the material. Q13.

(i) State Ampere’s circuital law. (ii) Sketch the magnetic field lines for a finite solenoid. (iii) How are these field lines different from the electric field lines from an electric dipole

Q14. Name three elements required to specify the earth’s magnetic field at a given place. Draw a labelled diagram to define these elements Explain briefly how these elements are used to determine the magnetic field at a given place on the surface of the earth. Q15. An alternating voltage given by v=70 sin 100πt is connected across a pure resistor of 25 Ω. Find

(i) The frequency of the source (ii) The rms current through the resistor

OR A series LCR Circuit is made by taking R=100Ω L=2/π H, C=100/π µH. This series combination is Connected across an AC source of 220V, 50 Hz. Calculate

(i) The impedance of the circuit and (ii) The peak vale of the current flowing in the circuit (iii) The power factor of this circuit and compare this value with the one at its resonant

frequency Q16. Identify the following e.m .wave as per the frequencies given below. Write one application of Each wave having frequency. (i) 1020 Hz (ii) 1012 Hz (iii) 1011 Hz Q17.Trace the path of ray of light passing through a glass prism(ABC) as shown in the figure. If the refractive index of glass is √3.Find out value of emergence from the prism.

Q18.Describe Young’s double slit experiment to produce interference pattern due to a monochromatic source of light. Deduce the expression for the fringe width. Q19.

(i) The mass of a particle moving with velocity 5x106 m/s has de‘ Broglie wavelength associated with it to be 0.135nm.calculate its mass.

(ii) In which region of the electromagnetic spectrum does this wavelength lie? Q20. Red Light however bright it is cannot produce the emission of electron from a clean zinc sulphate. But even weak ultra violet radiation can do so why? X rays of wavelength λ fall on photosensitive surface, emitting electrons. Assuming that the work function on the surface can

be neglected, Prove that the de Broglie wavelength of Electrons emitted will be√ .

Q21. Draw a plot of potential energy of a pair of nucleons as a function of their separations. Mark the region where the nuclear force is (i) attractive and (ii) Repulsive. Write any two characteristics feature of nuclear forces. Q22. Write the function of each of the following used in communication system.

(i) Transducer (ii) Repeater (iii) Transmitter

Q23. Mr Bharti, a physics teacher was performing an experiment in the lab using dry cell. The dry cell was weak, giving less voltage and was not sufficient to give proper reading. One of the students asked, Sir can’t we step up the voltage using transformer? The teacher replied,” No we cannot step up d.c. voltage using step up transformer. “He explained the students the principle of working of transformer. The students then constructed a transformer for their physics project and studied its working in detail.

a) What were the values displayed by the students? b) What is the Principle of a transformer? c) Why can’t a transformer be used to step up dc voltage?

Q24. (a) Draw 3 equipotential surface corresponding to a field that uniformly increases in magnitude but remain constant along z direction. How are these surfaces different from that of a constant electric field along z direction. (b) Explain, using suitable expressions how will the (capacitance (ii) electric field (iii) energy density of the capacitor change when spacing between plates is reduced to halved and dielectric medium of dielectric constant k=10 is introduced between the plates of capacitor.

OR (a) State Gauss’s Law in electrostatics. Using this Law derive an expression for the electric field of an infinite sheet of charge.

(b) An electron moves along a metal tube with varying cross section. How will its velocity change when it approaches the neck of the tube

Q25. (a) Draw the circuit diagram of common emitter transistor characteristics for npn transistor. Draw its input characteristics curve. (b) use the graph given below to obtain the approximate value of current amplification factor for the transistor Vce=3V.

OR (a) How is a Zener diode fabricated so as to make it a special purpose diode & Explain the

significance of breakdown voltage.Draw IV characteristics of Zener Diode. (b) Show the output waveform(Y) for the input A and B as Shown in the fig of (i) OR gate (ii) NAND

Gate Q26. (a) What is plane polarised light. Two polaroids are placed at 900 to each other and the transmitted intensity is zero. What happens when one more polaroid is placed between these two bisecting the angle between them, how will the intensity of transmitted light vary on further rotating the third polaroid.

(b) If a light beam shows no intensity variation when transmitted through a polaroid which is rotated does it mean light is unpolarised. Explain

OR (i) Draw a labelled ray diagram of a compound microscope showing the formation of image as

the near point of the eye. (ii) A compound microscope uses an objective lens of focal length 4cm eye lens of focal length

10cm An object is placed at 6cm from the objective lens. (a) Calculate magnifying power of the compound microscope if the final image is formed at the

near point. (b) Calculate the length of the compound microscope also.