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ICSE Notes 2016 : Physics

3 pages, 82 questions, 8 questions with responses, 8 total responses,    0    0
Anu krishna
St. Thomas Residential School, Thiruvananthapuram
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Q. 1. (i) What is thermionic emission (ii) Name two factors on which the rate of emission of thermions depend. Q. 2. What is an isotope ? One isotope of uranium has a mass number of 235 and an atomic number of 92. i. What is the number of electrons in a neutral atom of this isotope ? ii. How many protons are there in the nucleus of this atom ? iii. What is the number of neutrons in the nucleus of this isotope iv. Do all the isotopes of uranium have the same number of neutrons v. What is the number of protons in U238 ? Q. 3. Ultraviolet light falls on a dry zinc plate. i. Name the particles emitted from the plate. ii. What is the nature of charge acquired by the plate . iii. Name the phenomenon that takes place. iv. Name one of the devices based upon the above phenomenon. Q. 4. State the mechanism of production of X rays. Give two important properties o X ray. Q. 5. What is the photoelectric effect ? Draw a neat labelled diagram of a photoelectric cell. (out of course) Q. 6. (i) Define nuclear fusion and state the necessary conditions for the same . (ii) Name two factors on which the rate of emission of thermions depend. Q. 7. Why is diode called a valve ? Q. 8. Draw a neat labelled diagram of modern X ray tube. Q. 9. What is the mechanism of energy production in a fission reaction ? Q. 10. An particle absorbs an electron. What does it change to ? Q. 11. A fission reaction is represented as follows : 2 2 4 1H + 1H --> 2He + x Identify x. Q.12. (i) Draw a neat labelled diagram of a hot cathode ray tube. (ii) What is the effect on the beam particles if (a) a hotter filament is used ? (b) the anode voltage is increased ? (iii) Name one device in which the cathode ray tube is used. Q.13. State the factors that affect the rate of emission of electrons in a photoelectric cell. Q.14. (i) A thorium isotope 233Th90 undergoes an decay and changes to radium. What is the atomic number and mass number of radium produced? (ii) If the radium undergoes a further disintegration and emits two particles, represent the reaction in the form of an equation. (iii) What is the source of energy released during the decay ? Q.15. In the nuclear reaction given below, nucleus X changes to another nucleus Y. 226 Y + + energy 88X i. What are the atomic and mass numbers of Y ? ii. Name the gas formed when the -particle acquires two electrons. iii. What is the effect on the motion of the -particle when it passes through a region containing a magnetic field ? Q.16. What is a rectifier ? Give a reason why the diode valve is used as a rectifier. Q.17. What is the main difference between fission reaction and fusion reaction ? Give one example of each. Q.18. An atomic nucleus denoted by ZXA emits an alpha particle. Write an equation to show the formation of the daughter product. Q.19. X-rays are produced in a Coolidge tube when cathode rays are made to strike a target. i. Why is the anode of the tube heated up at the time of emission of X-rays ? ii. How are the strength and penetrating power controlled iii. Which of the soft and hard X-rays have longer wavelength and which has higher penetration power ?

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