ISC Physics 2017 Class-12 Solved Previous Year Question Paper

ISC Physics 2017 Class-12 Solved Previous Year Question Paper for practice. Step by step Solutions of Part I and II with section-A, B, C. Visit official website CISCE for detail information about ISC Class-12 Physics.

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Previous Year Question Paper ISC Physics 2017 Class-12 Solved


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Part – I 

Section-A Part – II

Section-B Part – II

Section-C Part – II


Class-12 Solved Previous Year Question Paper ISC Physics 2017\

Maximum Marks: 70
Time allowed: Three 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 ten questions from Part II, choosing four questions from
  • Section A, three questions from Section B and three questions from Section 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: Long 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 2017 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: [5] (i) The electrostatic potential energy of two point charges, 1 μC each, placed 1 metre apart in air is :
(a) 9 x 103 J
(b) P x 10J
(c) 9 x 10-3J
(d) 9 x 10-3 eV

(ii) A wire of resistance R ’ is cut into ‘n ’ equal parts. These parts are then connected in parallel with each other. The equivalent resistance of the combination is :
(a) nR
(b) R/n
(c) n/R2
(d) R/n2

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(iii) Magnetic susceptibility of platinum is 0.0001. Its relative permeability is :
(a) 1.0000
(b) 0.9999
(c) 1.0001
(d) 0

(iv) When a light wave travels from air to glass :
(a) its wavelength decreases
(b) its wavelength increases
(c) there is no change in wavelength
(d) its frequency decreases.

(v) A radioactive substance decays to 1/16th of its initial mass in 40 days. The half life of the substance, in days, is:
(a) 20
(b) 10
(c) 5
(d) 2.5

B. Answer all questions given below briefly and to the point: [15]
(i) Maximum torque acting on the electric dipole of moment 3 × 10-29 Cm in a uniform electric field E is 6 × 10-25 Nm. Find E.
(ii) What is meant by drift speed of free electrons ?
(iii) On which conservation principle is Kirchhoff’s Second Law of electrical networks based ?
(iv) Calculate magnetic flux density of the magnetic field at the center of a circular coil of 50 turns, having radius of 0.5 m and carrying a current of 5 A. .
(v) An a.c. generator generates an emf ‘s’ where e = 314 Sin (50 πt) volt. Calculate the frequency of the emf ∈.
(vi) With what type of source of light are cylindrical wave fronts associated ?
(vii) How is fringe width of an interference pattern in Young’s double slit experiment affected if the two slits are brought closer to each other ?
(viii) In a regular prism, what is the relation between angle of incidence and angle of emergence when it is in the minimum deviation position ?
(ix) A converging lens of focal length 40 cm is kept in contact with a diverging lens of focal length 30 cm. Find the focal length of the combination.
(x) How can the spherical aberration produced by a lens be minimised ?
(xi) Calculate the momentum of a photon of energy 6 x 10-19 J.
(xii) According to Bohr, Angular momentum of an orbiting electron is quantised. ’ What is meant by this statement ?
(xiii) Why nuclear fusion reaction is also called thermo-nuclear reaction ?
(xiv) What is the minimum energy which a gamma ray photon must possess in order to produce electron-positron pair ?
(xv) Show the variation of voltage with time, for a digital signal.
Answers:
ISC Class 12 Physics Previous Year Question Papers Solved 2017 55
ISC Class 12 Physics Previous Year Question Papers Solved 2017 56
ISC Class 12 Physics Previous Year Question Papers Solved 2017 57
ISC Class 12 Physics Previous Year Question Papers Solved 2019 58


Section-A Part – II (20 Marks)

(Answer any four questions)

Answer ten questions in this part, choosing four questions from Section A, three questions from Section B and three questions from Section C

( ISC Physics 2017 Class-12 Solved Previous Year Question Paper )

Question 2.
(a) Show that electric potential at a point P, at a distance ‘r’ from a fixed point charge Q, is given by: [4] \mathrm{V}=\left(\frac{1}{4 \pi \varepsilon_{0}}\right) \frac{Q}{r}

(b) Intensity of electric field at a perpendicular distance of 0.5 m from an infinitely long line charge having linear charge density (X) is 3.6 x 103 Vm-1. Find the value of λ . [1] Answer:
ISC Class 12 Physics Previous Year Question Papers Solved 2017 59
ISC Class 12 Physics Previous Year Question Papers Solved 2017 60
ISC Class 12 Physics Previous Year Question Papers Solved 2017 61

Question 3.
(a) Three capacitors C1 = 3 μF, C1 = 6 μF and C1= 10 μF are connected to a 50 V battery as shown in the Figure 1 below : [3]
ISC Class 12 Physics Previous Year Question Papers Solved 2017 62
Calculate :
(i) The equivalent capacitance of the circuit between points A and B.
(ii) The charge on C1
(b) Two resistors R1 = 60 Ω and R2 90 Ω are connected in parallel .If electric power consumed by the resistor R1 is 15 W, calculate the power consumed by the resistor R2. [2] Answer:
a) C1 = 3 μF1, C2 = 6 μF, C3 = 10 μF
If C’ be in equivalent capacitance between C1 and C2, then
ISC Class 12 Physics Previous Year Question Papers Solved 2017 63
ISC Class 12 Physics Previous Year Question Papers Solved 2017 64
Question 4.
(a) Figure 2 below shows two resistors R1 and R2 connected to a battery having an emf of 40 V and negligible internal resistance. A voltmeter having a resistance of 300 Ω is used to measure potential difference across R1. Find the reading of the voltmeter. [3] ISC Class 12 Physics Previous Year Question Papers Solved 2017 65
(b) A moving coil galvanometer has a coil of resistance 59 Ω. It shows a full scale deflection for a current of 50 mA. How will you convert it to an ammeter having a range of 0 to 3A ? [2] Answer:
ISC Class 12 Physics Previous Year Question Papers Solved 2017 66

Question 5.
(a) In a meter bridge circuit, resistance in the left hand gap is 2 Ω and an unknown resistance X is in the right hand gap as shown in Figure 3 below. The null point is found to be 40 cm from the left end of the wire. What resistance should be connected to X so that the new null point is 50 cm from the left end of the wire ?
ISC Class 12 Physics Previous Year Question Papers Solved 2017 67
b) The horizontal component of earth’s magnetic field at a place is 1/√3 times the vertical component. Determine the angle of dip at that place.
Answer:
ISC Class 12 Physics Previous Year Question Papers Solved 2017 68
Question 6.
(a) Using Ampere’s circuital law, obtain an expression for the magnetic flux density ‘B’ at a point X’at a perpendicular distance ‘r from a long current carrying conductor. (Statement of the law is not required). [3] (b) PQ is a long straight conductor carrying a current of 3A as shown in Figure 4 below. An electron moves with a velocity of 2 × 107 ms-1 parallel to it. Find the force acting on the electron.
ISC Class 12 Physics Previous Year Question Papers Solved 2017 69
Answer:
ISC Class 12 Physics Previous Year Question Papers Solved 2017 70
ISC Class 12 Physics Previous Year Question Papers Solved 2017 71
Question 7.
(a) (i) AB and CD are two parallel conductors kept 1 m apart and connected by a resistance R of 6 Ω as shown in Figure 5 below. They are placed in a magnetic field B = 3 × 10-2 T which is perpendicular to the plane of the conductors and directed into the paper. A wire MN is placed over AB and CD and then made to slide with a velocity 2 ms-l. (Neglect the resistance of AB, CD. and MN). [3] ISC Class 12 Physics Previous Year Question Papers Solved 2017 72
Calculate the induced current flowing through the resistor R.

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