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1. Moment of inertia is

vector scalar phasor tensor
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2. Rectifiers are used to convert

Direct current to Alternating current Alternating current to Direct current high voltage to low voltage low voltage to high voltage
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3. Materials for rain-proof coats and tents owe their water-proof properties to

surface tension viscosity specific gravity elasticity
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4. Railway tracks are banked on curves

necessary centrifugal force may be obtained from the horizontal component weight of the train to avoid frictional force between the tracks and wheels necessary centripetal force may be obtained from the horizontal component of the weight of the train the train may not fly off in the opposite direction
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5. magnetism at the centre of a bar magnet is

minimum maximum zero minimum or maximum
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6. Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its life enable it to withstand higher voltages increase its electrical conductivity increase its electrical resistivity
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7. Large astronomical telescopes always use as objective

lens mirror combinations of lenses None of the above
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8. RADAR is used for

locating submerged submarines receiving a signals in a radio receiver locating geostationary satellites detecting and locating the position of objects such as aeroplanes
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9. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Water, iron and air Iron, air and water Air, water and iron Iron, water and air
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10. One should not connect a number of electrical appliances to the same power socket because

this can damage the appliances due to overloading this can damage the domestic wiring due to overloading this can damage the electrical meter the appliance will not get full voltage
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