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1) The force of friction can be reduced by the help of a. ball bearing b. lubricants c. cushion surfaces d. all of them
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2) A force which occurs when two surfaces come in contact and slows down motion while acting in a. opposite direction b. same direction c. same and opposite direction d. both a and b
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3) Force can a. speed up b. slow down c. stop an object d. all of them
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4) Friction between moving parts of machine causes a. heat b. light c. energy d. oil
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5) When upthrust is equal to the weight of an object, it a. floats b. sinks c. moves d. stops
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6) The mass of a substance per unit of volume is called its a. weight b. density c. volume d. gravity
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7) There will be a great distance in stopping a vehicle which is moving a. slowly b. steady c. fast d. continuously
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8) The relationship between force, mass and acceleration is a. F=ma b. F=m-a c. F=m/a d. F=a/m
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9) In order to reduce air and water resistance, objects are shaped in a. streamline b. oblongata c. rectangular d. conical
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10) A substance will float on surface of water if its density is less than a. liquid b. gas c. both a and b d. aqueous
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