Question

1. (a) State any three characteristic of physicist. marks) (b) Explain the merits of using SI units for measurement marks) (c) State the three fundamental mechanical quantities marks) (d) Copy and complete the Physical Quantity table below. marks) Physical quantity Units Symbol Amount of substance Mol Electric current Length M Mass kg Time Second kelvin K Luminous intensity Candela A (& 2. (a) Tabulate four differences between Mass and weight. (b) State four reliable instrument for measuring the temperature of a body (c) State three reasons why water is NOT used as a thermometric liquid? (d)State two reasons why alcohol is used as thermometric liquid? ( C 3. (a) State three advantages of mercury as a thermometric liquid. (b) Change 65°F to centigrade (c) Explain the concept work" to your science colleague. (d) State the principle of Conservation Of Energy (e) State Isaac Newton First law of motion. 7 =

Answer 1

1 (a) Characteristic of physicist: 1. A physicist should have strong scientific ability. 2. A physicist should be able to think logically. 3. A physicist should be good in problem solving (b) Merits of SI units for measurement: 1. SI unit system is a coherent system of units. 2. SI unit system is a rational system of units. 3. SI is a metric system. Brittleness: It is a property, when a material breaks suddenly under stress, without exhibiting much elastic changes (deformation) in its dimension. Hardness: Hardness is a material's ability to oppose the various forms of indentation, deformation, and penetration. Strength: It is the measurement of how much load a material can withstand before failure. (d) Physical quantity Units Symbol Amount of substance Mole Mol Electric current Ampere A Length Meter Mass Kilogram Kg Time Second T Temperature Kelvin K Luminous intensity Candela cd M

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