Instruction :-
- All questions are compulsory. Internal options are given in each question from question no. 6 to 20
- Question no 1 to 3 carries 6 marks and question 4 to 5 carries 5 marks. Each sub-question carries 1 mark.
- Question no 6 to 12 carries 2 marks each. For every answer, word limit is 30 words.
- Question no 13 to 16 carries 3 marks each. For every answer, word limit is 75 words.
- Question no 17 to 20 carries 4 marks each. For every answer, word limit is 150 words.
Q.1 Choose the correct option.
(a) SI unit of current density is –
(i) Coulomb per metre (ii) Coulomb per metre2 (iii) Ampere per metre (iv) Ampere per metre2
(b) A moving electron produces –
(i) only the static electric field
(ii) only magnetic field.
(iii) magnetic field and static electric field both.
(iv) neither magnetic field nor electric field
(c) In an inductor L, if I current is flowing then the energy stored in is :
(i) LI^2 (ii) 2LI^2
(iii) 1/4LI^2 (iv) /2 LI ^2
(d) Formula of displacement current (Id) is –
(e) The overlapping of light in geometrical shadow is called –
(i) Interference (ii) Diffraction
(iii) Polarization (iv) Refraction
(f) The energy equivalent of 1 kg of substance is –
(i) 9×10^16 Joule (ii) 9×10^16 calorie
(iii) 9×10^16 electron volt (iv) 9×10^16 Erg
2 Fill in the blanks-
(a) 1 farad = ………….. Stat Farad.
(b) When current flows through the two parallel current carrying wires inopposite direction then they will ………….. each other.
(c) For direct current the inductive reactance is …………..
(d) The reciprocal of a focal length of a lens in meter is called …………..
(e) A wavefront that originates from a source at an infinite distance is called ……….. wavefront.
(f) The rest mass of electron is …………..
Q. 3 Write true/false.
a) The cells are joined in series to obtain high Voltage.
b) The magnetism of a ferromagnetic substance is not affected by the change in temperature.
c) A convex mirror always forms a small image.
d) The binding energy per nuclear of a stable nucleus must be less then 8 Mev.
e) Silicon and Germanium both are examples of Pure semiconductors.
Q.4 Match the following –
A B
a) Electric Dipole moment – i) nh/2π
b) Angle of deviation of light by prism – ii) h/p
c) De – Broglie wave length for matter wave- iii) −e^2/8πε₀ r
d) The total energy of electron in a – iv) (μ-1) A hydrogen atom
e) Angular momentum of electron – v) me4/8ε₀^2 𝑐ℎ^3
f) Rydberg’s constant – vi) q x 2l
Q 5 . Write answer in one word/sentence.
a) What is the effect of presence of dielectric medium on potential of conductor.
b) What is the main source of electromagnetic waves ?
c) Write relation between energy and frequency of a radiation.
d) Write the value of ionization energy of hydrogen atom in eV.
e) Write the cause of energy release in fission and fusion.
Q.6 Define electric flux and write its formula. 2
Or
Define electrical capacity of a conductor and write its a SI unit.
Q.7 Define electromotive force of an electric cell and write its SI unit. 2
Or
Write two necessary limitations of ohm’s law.
Q.8 Write Ampere’s Circuital law and write its expression. 2
Or
How is a current loop equivalent to magnetic dipole? Write on expression for the magnetic dipole moment.
Q.9 Write the main source and two uses of X-rays. 2
Or
Write the main source and two uses of gamma rays.
Q.10 A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal Length 6.0 cm. What is the magnifying power of the telescope ? What is the separation between the objective and the eyepiece? 2
Or
Double-convex lenses are to be manufactured. from a glass of refractive index 1.55 with both faces of some radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm.
Q.11 What is photoelectric effect? Write Einstein’s photo electric equation with the meaning of symbols used. 2
Or
What are de-Broglie waves ? Write the de-Broglie wave equation with the meaning of symbols used.
Q.12 Write two differences between the P and N type semiconductors. 2
Or
Explain the difference between the conductor and semiconductor by drawing their energy band diagrams.
Q.13 A horizontal overhead power line carries a current of 90 A in east to west direction. what is the magnitude and direction of the magnetic field due to the current 1.5m below the line? 3
Or
Two long and parallel straight wires A and B Carrying currents of 8.0 A and 5.0 A in the Same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section.
Q.14 Write Lenz’s law and explain that Lenz law is in accordance with the law of conservation of energy. 3
Or
Write the laws of electromagnetic induction. Establish the formula for the induced electromotive force.
Q.15 A charge 10 micro coulomb is given to a metallic hollow sphere of radius 1cm . Find the potential at the surface of sphere and Capacitance. 3
Or
A condenser of capacity 100 Pico-farad is charged to potential 100 volt. Calculate the charge stored and energy on condenser.
Q.16 Establish the relationship of refractive index with the real and apparent depths of an object placed in dense medium. 3
Or
Explain the phenomenon of total internal reflection write its necessary condition and write relation between critical angle and refractive index.
Q.17 Establish an expression for mutual inductance between two long coaxial current carrying Solenoids of same length wound over each other, Write the name of factors affecting mutual inductance. 4
Or
Explain alternating Current Dynamo (generator) under the basis of following heads!
(1) Principle (2) Labelled diagram (3) Working
Q. 18 Write Gauss’ law related to electric field. use Gauss law to find the intensity of electric field due to a linear charge. 4
Or
Write the definition of electric potential and Due to any point charge find out the electric potential at any point.
Q.19 Write the working of P-N and Junction diode in forward bias and reverse bias by drawing electric circuit. 4
Or
Write the definition of rectification?
Describe the use of P-N Junction diode as a full wave rectifier under the following heads.
(1) Electrical Circuit
(2) Working
(3) Wave form of input and output signals.
Q.20 Describe Compound Microscope on following head – When final image is formed at least distance of distinct vision. 4
(1) Ray diagram of formation of image.
(2) Derivation of formula for magnifying Power when final image is formed at least distance of distinct vision.
(3) Length of tube.
Or
Establish lens maker formula. For any thin lens and by this formula. Establish lens formula
1/f = 1/v-1/u
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