Sample Question Paper Class Xii Physics Applicable For-Books Pdf

Sample Question Paper Class XII Physics Applicable for
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mass of neutron 1 675 X 10 27 kg,mass of proton 1 673 X 10 27 kg. Avogadro s number 6 023 X 1023 per gram mole,Boltzmann constant 1 38 X 10 23 JK 1. 1 Figure shows a point charge Q located at a distance R 2 from the centre of a. spherical metal shell Draw the electric field lines for the given system. 2 Give an example of a material each for which temperature coefficient of. resistivity is i positive ii negative 1, 3 A device X is connected to an a c source V Vo sin t The variation of. voltage current and power in one complete cycle is shown in the following. i Which curve shows power consumption over a full cycle. ii Identify the device X,Page 2 of 23, 4 An object is placed in front of convex lens made of glass How does the image. distance vary if the refractive index of the medium is increased in such a way. that still it remains less than the glass 1, 5 Name the network within an institution made by connecting all or some of their.
computers 1, 6 Two cells of E M F 10 V and 2 V and internal resistances 10 and 5. respectively are connected in parallel as shown Find the effective voltage. across R 2, 7 Figure shows a system of two polarizing sheets in the path of initially. unpolarized light The polarizing direction of first sheet is parallel to x axis and. that of second sheet is 60o clockwise from x axis Calculate what fraction of. intensity of light emerges from the system 2,Page 3 of 23. State Huygen s principle Using it construct a ray diagram for a plane wave. front getting incident on a denser medium 2, 8 A monochromatic light source of power 5mW emits 8X1015 photons per. second This light ejects photoelectrons from a metal surface The stopping. potential for this set up is 2V Calculate the work function of the metal 2. 9 The following table shows some measurements of the decay rate of a. radionuclide sample Find the disintegration constant 2. Time min lnR Bq, 10 Distinguish between any two types of propagation of Electromagnetic waves.
with respect to i frequency range over which they are applicable ii. communication systems in which they are used 2, 11 Given a uniformly charged plane sheet of surface charge density 2X1017. i Find the electric field intensity at a point A 5mm away from the sheet on. the left side, ii Given a straight line with three points X Y Z placed 50 cm away from. the charged sheet on the right side At which of these points the field due to. the sheet remain the same as that of point A and why. Page 4 of 23, 12 The potential difference across a resistor r carrying current I is Ir 3. i Now if the potential difference across r is measured using a voltmeter of. resistance Rv show that the reading of voltmeter is less than the true value. ii Find the percentage error in measuring the potential difference by a. iii At what value of Rv does the voltmeter measures the true potential. difference, You are given two sets of potentiometer circuit to measure the emf E1 of a cell. Set A consists of a potentiometer wire of a material of resistivity 1 area of. cross section A1 and length l, Set B consists of a potentiometer of two composite wires of equal lengths l 2.
each of resistivity 1 2 and area of cross section A1 A2 respectively. i Find the relation between resistivity of the two wires with respect to their. area of cross section if the current flowing in the two sets is same. ii Compare the balancing length obtained in the two sets 3. Page 5 of 23, 13 i Name the machine which uses crossed electric and magnetic fields to. accelerate the ions to high energies With the help of a diagram explain the. resonance condition 2, ii What will happen to the motion of charged particle if the frequency of the. alternating voltage is doubled 1, 14 The magnetic field through a single loop of wire 12cm in radius and 8 5. resistance changes with time as shown in the figure The magnetic field is. perpendicular to the plane of the loop Plot induced current as a function of. 15 Identify the type of waves which are produced by the following way and write. one application for each 3,i Radioactive decay of the nucleus. ii Rapid acceleration and decelerations of electrons in aerials. Page 6 of 23, iii Bombarding a metal target by high energy electrons.
16 Consider a two slit interference arrangement shown in figure such that the. distance of the screen from the slits is half the distance between the slits. Obtain the value of D in terms of such that the first minima on the screen fall. at a distance D from the centre O 3, 17 A compound microscope consists of an objective of focal length 1cm and eye. piece of focal length 5cm separated by 12 2cm a At what distance from the. objective should an object be placed so that the final image is formed at least. distance of distinct vision b Calculate the angular magnification in this case. 18 Compare the photoelectric effect on the basis of photon theory and wave theory. of light and hence explain why the wave theory failed to explain it 3. 19 Derive the expression for the magnetic field at the site of a point nucleus in a. Hydrogen atom due to the circular motion of the electron Assume that the. atom is in its ground state and give the answer in terms of fundamental. constants 3, 20 The graph of potential barrier versus width of depletion region for an unbiased. diode is shown in A In comparison to A graphs B and C are obtained after. biasing the diode in different ways Identify the type of biasing in B C and. justify your answer 3,Page 7 of 23,21 Explain the following 3. i In the active state of the transistor the emitter base junction acts as a low. resistance while base collector region acts as high resistance. ii Output characteristics are controlled by the input characteristics in. common emitter transistor amplifier, iii LEDs are made of compound semiconductor and not by elemental. semiconductors, 22 i Write the factors that prevent a baseband signal of low frequency to be.
transmitted over long distances, ii What is to be done to overcome these factors Draw a block diagram to. obtain the desired signal 3, 23 Ria recently read about earth s magnetic field and its causes She became so. much fascinated by the topic that she further studied it in detail She collected. information as follows 4, The magnitude of magnetic field at the Earth s surface ranges from 0 25. to 0 65 gauss, The Earth s magnetic field varies with time There are short term and. long term variations,Page 8 of 23, One the scale of million years the Earth s magnetic field reverses its.
direction and much more, She made a power point presentation on the same and shared all this. information with her classmates, i Suggest another activity related to the same topic which will help a. student to internalize the same values gained by Ria. ii Draw a labelled diagram showing the three magnetic elements of earth. 24 a Two isolated metal spheres A and B have radii R and 2R respectively and. same charge q Find which of the two spheres have greater i Capacitance. and ii energy density just outside the surface of the spheres 2. b i Show that the equipotential surfaces are closed together in the regions of. strong field and far apart in the regions of weak field Draw equipotential. surfaces for an electric dipole 1 1, ii Concentric equipotential surfaces due to a charged body placed at the. centre are shown Identify the polarity of the charge and draw the. electric field lines due to it 1, a Compare the individual dipole moment and the specimen dipole moment for. H2O molecule and O2 molecule when placed in,Page 9 of 23.
i Absence of external electric field 2, ii Presence of external electric field Justify your answer 3. b Given two parallel conducting plates of area A and charge densities. A dielectric slab of constant K and a conducting slab of thickness d each. are inserted in between them as shown, i Find the potential difference between the plates. ii Plot E versus x graph taking x 0 at positive plate and x 5d at negative. 25 a With the help of a diagram explain the principle and working of a device. which produces current that reverses its direction after regular intervals of. b If a charged capacitor C is short circuited through an inductor L the charge. and current in the circuit oscillate simple harmonically. i In what form the capacitor and the inductor stores energy. ii Write two reasons due to which the oscillations become damped 2. a Figure shows the variation of resistance and reactance versus angular. frequency Identify the curve which corresponds to inductive reactance and. Page 10 of 23,resistance, b Show that series LCR circuit at resonance behaves as a purely resistive. circuit Compare the phase relation between current and voltage in series. LCR circuit for i XL XC ii XL XC using phasor diagrams. c What is an acceptor circuit and where it is used 1 3 1. 26 a Draw a ray diagram to show the formation of the real image of a point. object due to a convex spherical refracting surface when a ray of light is. travelling from a rarer medium of refractive index 1 to a denser medium of. refractive index 2 Hence derive the relation between object distance image. distance and radius of curvature of the spherical surface 3. b An object is placed in front of right angled prism ABC in two positions as. shown The prism is made of crown glass with critical angle of 410 Trace. the path of the two rays from P Q 2,Page 11 of 23, a Calculate the value of for which light incident normally on face AB grazes. along the face BC g 3 2 w 4 3 2, b Draw a graph showing the variation of angle of deviation with that of angle.
of incidence i for a monochromatic ray of light passing through a glass prism. of refracting angle A What do you interpret from the graph Write a relation. showing the dependence of angle of deviation on angle of incidence and hence. derive the expression for refractive index of the prism 3. Sample Question Paper Class XII Physics Applicable for March 2016 Examination Time Allowed 3 Hours Maximum Marks 70 General Instructions 1 All questions are compulsory There are 26 questions in all 2 This question paper has five sections Section A Section B Section C Section D and Section E 3 Section A contains five questions of

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