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Physics | ICSE Board | Grade 12 | 2015
Q. What is the signeficance of binding energy per nucleon of a nucleus of a radioactive element?
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Q. Wavelengths of the first lines of the Lyman series, Paschen series and Balmer series in hydrogen spectrum are denoted by λL, λPandλB respectively. Arrange these wavelength in increasing order.
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Q. Two points charges of 10C each are kept at a distance of 3m in vacuum. Calculate their electrostatic potential energy.
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Q. If EP and Ek represent potential energy and kinetic energy respectively, of an orbital electron, then according to Bohr's theory:
  1. Ek=Ep
  2. Ek=2Ep
  3. Ek=2Ep
  4. Ek=Ep/2
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Q. Derive an expression for intensity of electric field at a point broadside position or an equatorial line of an electric dipole.
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Q. State Moseley's law.
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Q. A moving electron entres a uniform and perpendicular magnetic field. Inside the magnetic field, the electron travels along:
  1. A straight line
  2. A parabola
  3. A hyperbola
  4. A circle
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Q. Draw labelled graphs to show how electrical resistance varies with temperature for:
(a) A metallic wire.
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Q. An emf of 2V is induced in a coil when current in it is changed from 0A to 10A in 0.40 sec. Find the coefficient of self-inductance of the coil.
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Q. State how magnetic susceptibility is different for the three types of magnetic materials, i.e., diamagnetic, paramagnetic and ferromagnetic materials.
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Q. Draw labelled graphs to show how electrical resistance varies with temperature for:
(a) A piece of carbon.
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Q. A short electric dipole (which consists of two point charges +qandq) is placed at the centre O and inside a large cube (ABCDEFGH) of length L, as shown in figure. The electric flux, emanating through the cube is:
596416_32cd3c9b12994b258b5eda214bb8fa33.png
  1. Zero
  2. q/3πε0L
  3. q/4πε0L
  4. q/2πε0L
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Q. State any one advantage of using a reflecting telescope in place of a refracting telescope.
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Q. Two resister R1=400Ω and R2=20Ω are connected in parallel to a battery. If heating power developed in R1 in 25 W, find the heating power developed in R2.
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Q. What type of lens is used to correct long-sightedness?
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Q. Four capacitors, C1, C2, C3 and C4 are connected as shown in figure below. Calculate equivalent capacitance of the circuit between points X and Y.
596458_4d0a8ad888d94b41a7f40918328f20af.png
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Q. With the help of labelled diagram, show that the balancing condition of Wheatstone bridge is:
R1R2=R3R4 where the terms have their usual meaning.
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Q. Write any one balanced equation representing nuclear fission.
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Q. A monochromatic ray of light falls on a regular prism. What is the relation between angle of incidence and angle of emergence in the case of minimum deviation ?
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Q. How are electric vector (E), magnetic vector (B) velocity vector (c) oriented in an electromagnetic wave ?
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Q. The equivalent resistance between points a and f of the networks shown in figure.
596418.PNG
  1. 24 Ω
  2. 110 Ω
  3. 140 Ω
  4. 200 Ω
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Q. A resistor R is connected to a cell of emf e and internal resistance r. Potential difference across the resistor R is found to be V. State the relation between e, V, R and r.
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Q. Three identical cells each of emf 2V and internal resistance 1Ω are connected in series to form a battery. The battery is then connected to a parallel combination of two identical resistors, each of resistance 6Ω. Find the current delivered by the battery.
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Q. What is the difference between analog signal and digital signal?
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Q. Name three elements of the earth's magnetic field which help in defining earth's magnetic field completely.
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Q. A 10 m long uniform metallic write having a resistance of 20 Ω is used as a potentiometer wire. This wire is connected in series with another resistance of 480 Ω and a battery of emf 5 V having negligible internal resistance. If an unknown emf e is balanced across 6 m of the potentiometer wire, calculate:
(i) The potential gradient across the potentiometer wire.
(ii) The value of the unknown emf e.
596682_7c414b86734140698a0f624cd4eb219c.png
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Q. Explain the term hysteresis.
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Q. What is meant by term Quantization of of charge?
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Q. State any two methods by which ordinary light can be polarised.
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Q. A fish which is at a depth of 12 cm in (μ=43) is viewed by an observer on the bank of lake. Its apparent depth as observed by the observer is:
  1. 3 cm
  2. 9 cm
  3. 12 cm
  4. 16 cm
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