Time: 30 minutes Marks: 100
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Which of the following is the best conductor for electricity? A. Distilled water B. Salt water C. Tap water D. Rain water A sprayer works on the principle expounded by A. Newton B. Archimedes C. Boyle D. Pascal Cloudy nights are warmer because A. clouds prevent radiation of heat from the ground into the air B. of low atmospheric pressure C. of the compact density of air D. more dust particles gather in the air A moving body on earth ordinarily comes to rest by itself because of the A. law of inertia B. force of friction C. conservation of momentum D. gravity An isotherm is a line joining places having equal A. Humidity B. Air pressure C. Temperature D. Rainfall Railway tracks are banked on curves so that A. necessary centrifugal force may be obtained from the horizontal component of the weight of the train B. frictional force can be avoided between the tracks and wheels C. necessary centripetal force may be obtained from the horizontal component of the weight of the train D. the train may not fly off in the opposite direction In deserts, clouds do not precipitate because of A. low pressure B. low humidity C. high wind velocity D. low temperature The spinning of Earth on its axis is called A. Rotation B. Revolution C. Orbit D. Movement The ink of a pen leaks out in an aeroplane because A. atmospheric pressure increases B.pressure of ink inside is more than the ambient pressure C. high spe ed of the aeroplane D. temperature difference In an electric kettle water becomes hot by A. conduction B. radiation C. moving particles D. convection Which of the following criteria is necessary for any metal to be used as a cooking utensil? A. less thermal conductivity B. more thermal conductivity C. less electrical conductivity D. more density Clouds float in the atmosphere because of their low A. temperature B. speed C. pressure D. density Light year is a unit of A. time B. distance C. light D. intensity of light Fish can survive inside a frozen lake because A. fish are cold blooded animals B. fish can breathe when embedded in ice C. fish move to the bottom of the lake where the water is at 40C and hence cannot freeze D. fish move to the top of the lake where the water is at 40C and hence cannot freeze Magnetism at the centre of a bar magnet is A. minimum B. maximum C. zero D. minimum or maximum Seismograph is an instrument used for measuring A. windspeed B. rainfall C. earth quake D. snow fall Why are we able to hear short wave broadcasts better than long wave broadcasts? A. short wave broadcasts are made by nearby radiostations B. short waves are unaffected by atmospheric disturbances
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C. short waves are more energetic than long waves D. by convention, short waves are meant for long distances whereas long waves are reserved for short distances Which of the following is a good conductor of heat but bad conductor of electricity ? A. asbestos B. celluloid C. silver D. mica On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because A. mercury is a metal B. the density of mercury is greater than that of water C. the cohesion of mercury is greater than its adhesion with glass D. the cohesion of water is greater than its adhesion with glass Bats can fly in the dark because A. they can see better in the dark B. the pupils of their eyes are very wide C. they are guided by the ultrasonic waves that they produce D. they are guided by micro waves When a ship floats on water A. it displaces no water B. the mass of water displaced is more than the mass of the ship C. the mass of water displaced is equal to the mass of the ship D. the mass of water displaced is less than the mass of the ship A capacitor (condenser) is used in an electrical...