CBSE Physics Sample Paper CBSE Physics Sample Paper 1. An electron, an alpha-particle and a proton have the same kinetic energy. Which one of these particles has the largest de-Broglie wavelength ? 2. Why should the material used for making permanent magnets have high coercivity ? 3. Why is frequency modulation perferred over amplitude modulation for transmission of music ? 4. The output of an OR gate is connected to both the inputs of a NAND gate. Draw the logic circuit of this combination of getes and write its truth table. 5. Draw a plot of potential energy of a pair of nucleons as a function of their separation. What is the significance of negative potential energy in the graph drawn ? 6. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index . 7. Distinguish between the terms ‘average value’ and ‘rms value’ of an alternating current. The Know More About :- Psychology ICSE Sample Paper
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instantaneous current from an a.c. source is I = 5 sin (314 t) ampere. What are the average and rms values of the current ? 8. Write the relation for the force acting on a charge carrier q moving with a velocity through a magnetic field in vector notation. Using this relation, deduce the conditions under which this force will be (i) maximum (ii) minimum. 9.. State the condition under which a microwave oven heats up a food item containing water molecules most efficiently. 10. The de Broglie wavelengths, associated with a proton and a neutron, are found to be equal. Which of the two has a higher value for kinetic energy? 11. Carbon and silicon are known to have similar lattice structures. However, the four bonding electrons of carbon are present in second orbit while those of silicon are present in its third orbit. How does this difference result in a difference in their electrical conductivities? 12. What do the terms ‘depletion region’ and ‘barrier potential’ mean for a p-n junction? 13. We do not choose to transmit an audio signal by just directly converting it to an e.m. wave of the same frequency. Give two reasons for the same. 14. Light of wavelength 550 nm. is incident as parallel beam on a slit of width 0.1mm. Find the angular width and the linear width of the principal maxima in the resulting diffraction pattern on a screen kept at a distance of 1.1m from the slit. Which of these widths would not change if the screen were moved to a distance of 2.2m from the slit? 15. (a) Draw the block diagram of a communication system. (b) What is meant by ‘detection’ of a modulated carrier wave? Describe briefly the essential steps for detection. Read More About :- ICSE Business Studies Sample Papers
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