1) How many cm in a metre? a) 1 b) 10 c) 100 d) 1000 e) 10000 f) 6 2) How many mm in a cm? a) 1 b) 10 c) 100 d) 1000 3) How many mm in a metre? a) 1 b) 10 c) 100 d) 1000 e) 10000 4) What units are most things in a cell measured in? a) Metres b) Centimetres c) Millimetres d) Micrometres 5) How many micrometres fit into a single millimeter? a) 1 b) 10 c) 100 d) 1000 e) 10000 f) 1000000 6) An onion cell is 0.075mm wide. Under the microscope it looks 7.5mm wide. What magnification was it viewed under? a) x10 b) x100 c) x1000 d) x10000 7) The width of a cell is 0.02mm The length of the cell is 0.08mm Estimate the area of the cell. a) 0.04mm b) 0.25mm c) 0.25mm2 d) 0.016mm e) 0.0016mm2 f) 0.16mm2 8) The width of a cell is 0.02mm The image of the cell under the microscope looks 8mm. What magnification was it viewed under? a) x16 b) x0.16 c) x4 d) x40 e) x400 f) x0.0025 9) Choose the reason why electron microscopes are better than light microscopes a) They are cheaper b) They are easier to use c) They are smaller d) They have a higher magnification 10) What is 0.0025 in standard form? a) 2.5x10-1 b) 2.5x10-2 c) 2.5x10-3 d) 2.5x10-4 e) 2.5x10-5

B1 Topic 1 Microscopes

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