Thanks dear for correction, but the earth revolves around the sun not rotates arrond it.It only rotates arround its axis.

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Paper 1994

9. Differentiate between any five of the following pairs.
(i) Veins and arteries
(ii) PNP and NPN transistor
(iii) Electronic current and static electricity
(iv) Concave and convex lens
(v) Fats and oils
(vi) Absorption and adsorption

13. Which part of a plant do they belong to?
(i) Ginger
(ii) Raddish
(iii) Potato
(iv) Cinnamon
(v) Peanut
(vi) Saffron
(vii) Almond
(viii) Chillies
(ix) Spinach
(x) Tomato


15. Fill in the blanks.

(i) In a heat engine, heat energy is changed into _________ (mechanical energy, magnetic energy, light energy)
(ii) Frequency of audible sound in Hertz (Hz) is _________ (20 – 20,000Hz, 20,000 – 30,000Hz, 30,000 – 4,000Hz)
(iii) Deficiency of vitamin B causes _________ (rickets, beriberi, night blindness)
(iv) Cheapest source of producing electricity is _________ (coal, natural gas, water)
(v) The smallest unit of measurement of wavelength is _________ (micrometer, angstrom, manometer)
(vi) The chemical generally used in refrigerators is _________ (ethylene, glycofreon, methyl alcohol)
(vii) The unit of ‘TON’ to specify air conditioners is equal to _________ (10,000 BTU/hour, 12,000 BTU/hour, 16,000 BTU/hour)
(viii) Unit of electricity ‘KILOWATT HOUR’ is the unit of (force, work, power)
(ix) Period of famous Muslim scientists is _________ (3rd – 5th century, 6th – 7th century, 7th – 13th century A.D.)
(x) Heat radiation travels at a speed equal to _________ (half the speed of light, speed of light, speed of wind)


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