1. Draw a ray diagram to determine the position of image formed of an object placed between the pole and the focus of concave mirror. [1]
2. The power of a lens is +5.5D. What is the focal length and nature of this lens? [11
3. A 14 years old student is not able to see clearly the questions written on a blackboard placed at a distance of 5m from him.
(i) Name the defect of vision, he is suffering from,
(ii) Name the type of lens used to correct this defect. [1]
4. What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this? [1]
5. A compound ‘X’ is an important ingredient of an antacid. It is also used in fire extinguisher. Identify ‘X’ & write its chemical formula? [11
6. Giving an example to explain thermit reaction. [1]
7. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor. He reports that,
(i) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are inter changed.
(ii) for a given battery, the degree of deflection of a N-pole decreases when the compass is kept at a point farther away from conductor. Which of the above obseivations of the student is incorrect? Why? [2]
8. What will be observed when the screen is placed,
(i) between the two inverted prism, and
(ii) after the second inverted prism as shown in the figure?
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