NOTE:- Kindly solve physics, chemistry and biology in separate answer sheet.
Physics (Marks-33)
1.
2.
1
1
1
Define resistivity.
How many joules are there in 1 kWh.
3. Why the filament of bulb has high melting point?
4. Give two uses of concave mirror.
5. What is the focal length of convex mirror whose radius of curvature is 30 cm?
6.
Draw a schematic diagram of a circuit consisting of a battery of 6 cell of 1.5 volt each,
three resistors each of 3 ohm in series and a plug key.
7. What is Joule's heating effect of current? Derive its expression.
8. The refractive index of glass is 1.54 and the speed of light in air is 3 x 10 m/s. Calculate
the speed of air in glass.
9. What do you understand by refraction of light? Draw the labelled ray diagram.
10. An electrical appliance of power 2 KW works at potential difference of 220 V. Does it
require fuse of 5 A. Give reason.
11. Three resistances of 20, 30 and 50 are connected in the electric circuit. Calculate th
i. Maximum effective Resistance ii. Minimum effective resistance
12. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far
object placed from the lens? Draw the ray diagram.
13. Two thin lenses of power +3.5D and -2.5D are placed in the contact. Find the pow
focal length, if lens are in combination.
14. On what factor the resistance of conductor depends? Give its mathematical expr
Give the S.I. unit of resistivity.
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