ISC Physics 2010 Class-12 Solved Previous Year Question Paper for practice. Step by step Solutions of Part I and II with section-A, B and C. Visit official website CISCE for detail information about ISC Class-12 Physics.

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## Previous Year Question Paper ISC Physics 2010 Class-12 Solved

Part – I

Section-A Part – II

Section-B Part – II

Section-C Part – II

### Previous Year Question Paper ISC Physics 2010 Class-12 Solved

Maximum Marks: 70
Time allowed: 3 hours

• Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time
• Answer all questions in Part I and six questions from Part II, choosing two questions from each of the Sections A,B and C.
• All working including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer.
• The intended marks for questions or parts of questions are given in brackets [ ].
• Material to be supplied: Log tables including Trigonometric functions
• A list of useful physical constants is given at the end of this paper.

### Part – I (20 Marks)(Answer all questions)

( ISC Physics 2010 Class-12 Solved Previous Year Question Paper )

Question 1.
A. Choose the correct alternative A, B, C or D for each of the questions given below : 
(i) Electric field intensity ‘E’ at a point P (Figure 1) at a perpendicular distance ‘r’ from an infinitely long line charge X’X having linear charge density λ is given by :
(A) $E=\left(\frac{1}{4 \pi \mathcal{E}_{0}}\right) \frac{2 \lambda}{r^{2}}$
(B) $E=\left(\frac{1}{4 \pi \varepsilon_{0}}\right) \frac{2 \lambda}{r}$
(C) $\mathrm{E}=\left(\frac{1}{4 \pi \varepsilon_{0}}\right) \frac{\lambda}{r^{2}}$
(D) $E=\left(\frac{1}{4 \pi \varepsilon_{0}}\right) \frac{\lambda}{r}$ (ii) A moving coil galvanometer can be converted into a voltmeter by connecting
(A) a low resistance in series with its coil.
(B) a low resistance in parallel with its coil.
(C) a high resistance in parallel with its coil.
(D) a high resistance is series with its coil.

(iii) The loss of power in a transformer can be reduced by :
(A) increasing the number of turns in primary.
(B) increasing ac voltage applied to primary.
(C) using a solid core made of steel.
(D) using a laminated core of soft iron

(iv) Which equation represents the emission of a beta particle by a radioactive nucleus :
(A) $_{0}^{1} n \rightarrow_{1}^{1} \mathrm{H}+_{-1}^{0} e+\overline{v}$
(B) $\gamma \rightarrow_{1}^{0} e+_{-1}^{0} e$
(C) $4 \frac{1}{1} \mathrm{H} \rightarrow_{2}^{4} \mathrm{H} e+2_{1}^{0} e$
(D) $_{2}^{4} \mathrm{He}+_{7}^{14} \mathrm{N} \rightarrow_{8}^{17} \mathrm{O}+_{1}^{1} \mathrm{H}$

(v) An important component of Michelson’s method to determine speed of light is :
(A) a NICOL prism.
(B) a bi prism.
(C) a grating.
(D) an octagonal mirror.

B. Answer all questions briefly and to the point: 
(i) In an electric dipole, what is the locus of a point of zero potential ?
(ii) What is the resistance of a carbon resistor whose coloured bands are shown in Figure 2. (iii) A part of an electric circuit is shown below (Figure 3): Using Kirchhoff’s 2nd Law, find the current I flowing through the 4 Ω resistor.

(iv) Figure 4 below shows a graph of emf ‘e’ generated by an ac generator versus time ‘t’. What is’the frequency of the emf ?

(v) Arrange the three types of magnetic materials, i.e. para magnetic, diamagnetic and ferromagnetic materials, in decreasing order of their magnetic susceptibility.

(vi) Which electromagnetic wave is longer than X ray but shorter than light wave ?

(vii) Calculate the critical angle for glass and water pair. (The refractive index for glass is 1.50 and the refractive index for water is 1.33).

(viii) Name an optical device, which, when used with a spectrometer, can determine the wavelength of the given monochromatic light.

(ix) Young’s double slit experiment was performed with monochromatic light of blue color. The experiment was then repeated, first with light of red color and then, with light of yellow color. Which color produces interference pattern with maximum fringe separation (i.e. fringe width) ?

(x) Calculate dispersive power of glass, accurately upto three decimal places, from the following data:
Refractive index of glass for red colour = 1.60
Refractive index of glass for yellow colour =1.61
Refractive index of glass for violet colour = 1.62

(xi) De Broglie wavelength of electrons of kinetic energy E is λ. What will be its value of kinetic energy of electrons is made 4E ?

(xii) How much energy will be created if 1 g of matter is destroyed completely ?

(xiii) Complete the following nuclear reaction: $\frac{1}{0} n+_{6}^{12} \mathrm{C} \rightarrow_{5}^{-12} \mathrm{B}+\ldots .$

(xiv) State one important use of a Zener diode.

(xv) Draw a labelled graph of voltage versus time for a signal voltage used in digital circuits.
A.

(i) The correct choice is B i.e. $E=\frac{1}{4 \pi \varepsilon_{0}} \frac{2 \lambda}{r}$

(ii) D, i.e. a high resistance in series with the coil.

(iii) D, by using a laminated iron core.

(iv) The correct choice is A.

(v) D, an octagonal mirror.

B.

(i) A straight line passing through the center of the dipole and perpendicular to its axis.

(ii) 24 x 10° = 24 Ω (according to color code)

(iii) Since, there is no battery in the closed mesh
ABC, therefore Σir = 0
∴ Applying second law to the mesh ABCA, we get \begin{aligned} 3 \times 2+\mathrm{I} \times 4-6 \times 2 &=0 \\ 4 \mathrm{I} &=6 \\ \mathrm{I} &=\frac{6}{4}=1.5 \mathrm{A} \end{aligned}

(iv) If study the (e. t) curve it is quite evident that to produce one cycle of a.c., the time taken is 0.10 s
∴ T = 0.1 s
∴ Frequency v = 1/T = 1/0.1 = 10 Hz

(v) Ferromagnet, paramagnetic and diamagnetic.

(vi) Ultraviolet rays

(vii) Given here is 1.5 (viii) Diffraction grating.

(ix) Since the fringe width is directly proportional to the wavelength of light, the fringe width will be maximum with red light. (xii) According to Einstein relation

(xiii) The completed nuclear reaction is $\frac{1}{0} n+_{6}^{12} \mathbf{C} \rightarrow_{5}^{11} \mathbf{B}+_{1}^{2} \mathbf{H}$

(xv) Section-A Part – II (20 Marks)

(Answer six questions in this part, choosing two questions from each of the Sections A, B and C)

### ( ISC Physics 2010 Class-12 Solved Previous Year Question Paper )

Question 2.
(a) An isolated 16 μF parallel plate air capacitor has a potential difference of 1000 V (Figure 5a). A dielectric slab having relative permittivity (i.e. dielectric constant) = 5 is introduced to fill the space between the two plates completely (Figure 5 b). Calculate :  (i) the new capacitance of the capacitor.
(ii) the new potential difference between the two plates of the capacitor. (b) An electron revolves around the nucleus of hydrogen atom in a circular orbit of radius 5 x 10-11 m. Calculate: 
(i) intensity of electric field of the nucleus at the position of the electron.
(ii) electrostatic potential energy of the hydrogen nucleus and electron system

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