1) An ovum has a mass of about 3.6µg, that is equal in value to 3.6 x ......................... g a) 0.01 b) 0.001 c) 0.000 001 d) 0.000 000 001 2) A human cell has a mass of about 1ng, that is equal in value to ......................... g a) 0.01 b) 0.001 c) 0.000 001 d) 0.000 000 001 3) A mosquito has a mass of about 2.5 mg, that is equal in value to 2.5 x ......................... g a) 0.01 b) 0.001 c) 0.000 001 d) 0.000 000 001 4) The mass of an Airbus, A308 plane, without passengers = 361 000 000 g, which is equals to 0.361 x ......................  a) Mg b) kg c) Gg 5) The length of a protozoan = 0.052 mm, which is equals to ......................  a) 52 m b) 52 µm c) 52 nm 6) Earth takes 1 year (365 days) to orbit the Sun. Calculate the rotation in seconds. a) 8 760 s b) 525 600 s c) 31 536 000 s 7) A student measures a circumference of a beaker with the value of 21.5 cm. Change the value to its SI unit. a) 0.215 m b) 2.15 m c) 2 150 m 8) Time taken to complete a precipitation reaction is about 30.8 s. Change the time taken to minute unit. a) 1 848 min b) 1.28 min c) 0.513 min 9) 1 G = ? a) 1 x 109 b) 1 x 106 c) 1 x 103 10) 1 d = ? a) 10-1 b) 10-2 c) 10-3 11) 1 n = ? a) 10-6 b) 10-9 c) 109 d) 106 12) 1 M = ? a) 10-6 b) 10-9 c) 109 d) 106 13) 1 = ?µ a) 10-6 b) 10-9 c) 109 d) 106 14) 2960 m = ? a) 29 600 dm b) 29.60 km c) 29 600 cm 15) 1.62 m = ? a) 162 dm b) 162 cm c) 162 mm

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