Select and write the correct option from the options given in each question. 1. Magnetic effect of electric current was discovered by: 1. Fleming 2. Oersted 3. Faraday 4. Ampere
2. The SI Unit of magnetic flux is 1. Weber 2. Gauss 3. Oersted 4. Tesla
3. The overlapping of light in geometrical shadow is called 1. Interference 2. Diffraction 3. Polarization 4. Refraction
4. A photon has energy 3 ev. Then wave length of photon is 1- 4125 nm 2- 412-5 nm 3- 4150 nm 4- 4 nm
5. Energy equivalent to 1gm of mass is 1- 9X106 Joule 2- 3X1013 Joule 3- 3X106 Joule 4- 9X1013 Joule
Fill in the blanks: (a) When current flows through the two parallel wires is in same direction then then will…………………each other. (b) The magnetic field at the centre of a current carrying circular coil is………… to its plane. (c) When an electron moves……………………to a magnetic field then no force acts on it. (d) If the rate of loss of energy in an circuit is zero then the current through circuit is called…………………..current. (e) Transformer works on the principle of ………………… (f) The direction of induced current in the coil is given by……………..law. (g) …………………….is the principle of working of optical fibre.
Write the answer in one word or one sentence. 1×7=7 v ad 1. How does increase temperature affect the conductivity of a semi conductor? 2. What is the order of thickness of depletion layer in a P-N Diode ? 3. In which bias does a P-N diode offer greater resistance ? 4. In young’s double slit experiment for which colour of light fringe width is minimum ? 5. What is the cause of colours in thin films ? 6. Write the names of different part of electromagnetic spectrum in increasing order of frequency. 7. Which part of electromagnetic spectrum have maximum penetrating power ?
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