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Assesses and reinforces the student's knowledge of SI units, factorial prefixes and unit conversions.
Questions and Answers
1.
What is the base unit for length?
A.
Foot
B.
Metre
C.
Kilogram
Correct Answer B. Metre
Explanation The base unit for length is the metre. The metre is a unit of measurement used to quantify distance or length. It is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second. The metre is widely used in the international system of units (SI) and is the standard unit for measuring length in most countries around the world.
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2.
What is the base unit for temperature?
A.
Degree Kelvin
B.
Degree Fahrenheit
C.
Degree Celsius
Correct Answer(s) A. Degree Kelvin C. Degree Celsius
Explanation The base unit for temperature is the degree Kelvin. The Kelvin scale is an absolute temperature scale where zero Kelvin represents absolute zero, the point at which all molecular motion ceases. The degree Celsius is also a commonly used unit for temperature, but it is not the base unit.
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3.
What is the base unit for mass?
A.
Gram
B.
Ounce
C.
Kilogram
Correct Answer C. Kilogram
Explanation The base unit for mass in the International System of Units (SI) is the kilogram (kg). The kilogram is defined as the mass of the International Prototype of the Kilogram, a platinum-iridium cylinder kept at the International Bureau of Weights and Measures in France. It is the standard unit of mass used for most scientific and everyday purposes.
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4.
What is the unique base unit for area?
A.
M²
B.
Acre
C.
Hectare
Correct Answer C. Hectare
Explanation The hectare is the unique base unit for area. It is a metric unit commonly used in measuring land area. The hectare is equal to 10,000 square meters and is widely used in agriculture and land management. It provides a convenient unit for measuring large areas of land. The other options, m² and acre, are also units of area, but they are not considered base units. The m² is a derived unit from the SI system, and the acre is primarily used in the United States and the UK.
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5.
What is the bulk base unit for mass?
A.
Kg
B.
Ton
C.
Tonne
Correct Answer C. Tonne
Explanation The bulk base unit for mass is the tonne. A tonne is a metric unit of mass that is equal to 1000 kilograms. It is commonly used in industries such as shipping, construction, and agriculture to measure large quantities of materials. The other options, kg and ton, are also units of mass, but they are not considered bulk base units like the tonne.
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6.
What is the base unit for capacity?
A.
Litre
B.
Cubic centimetre
C.
Pint
Correct Answer A. Litre
Explanation The base unit for capacity is the litre. It is a metric unit of measurement for liquid volume. It is commonly used to measure the volume of beverages, containers, and other liquids. The litre is equal to 1000 cubic centimetres or 1.76 pints.
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7.
The prefix kilo means
A.
Base unit ÷ 1000
B.
Base unit
C.
1000 x base unit
Correct Answer C. 1000 x base unit
Explanation The prefix "kilo" is used to denote a multiplication factor of 1000. Therefore, when the base unit is multiplied by 1000, it represents the meaning of the prefix "kilo".
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8.
The prefix milli means
A.
Base unit ÷ 1000
B.
Base unit
C.
1000 x base unit
Correct Answer A. Base unit ÷ 1000
Explanation The prefix "milli" is used to denote one thousandth of a base unit. Therefore, when the base unit is divided by 1000, it represents the value of the prefix "milli".
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9.
The prefix centi means
A.
Base unit ÷ 100
B.
Base unit x 1000
C.
100 x base unit
Correct Answer A. Base unit ÷ 100
Explanation The prefix "centi" refers to a division by 100. It indicates that the unit being referred to is one hundredth of the base unit. For example, if the base unit is meter, then "centimeter" would be one hundredth of a meter. Therefore, the correct answer is "base unit ÷ 100".
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10.
The prefix Mega means
A.
Base unit ÷ 1000, 000
B.
Base unit x 1000, 000
C.
100, 000 x base unit
Correct Answer B. Base unit x 1000, 000
Explanation The prefix "Mega" is used to denote a factor of one million. Therefore, when applied to a base unit, it multiplies the base unit by 1,000,000.
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11.
One hectare is equivalent to a square of sides 100 m in length
A.
True
B.
False
Correct Answer A. True
Explanation One hectare is a unit of measurement for land area and is equal to 10,000 square meters. Since a square with sides of 100 meters has an area of 10,000 square meters, it is equivalent to one hectare. Therefore, the statement "one hectare is equivalent to a square of sides 100 m in length" is true.
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12.
One hectare is how many square metres?
Correct Answer 10, 000 10,000 10000 ten thousand
Explanation The correct answer is 10,000. One hectare is equal to 10,000 square meters.
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13.
34 metres is the same as
A.
340 cm
B.
3400 mm
C.
3400 cm
D.
34000 cm
Correct Answer C. 3400 cm
Explanation To convert metres to centimetres, we multiply the number of metres by 100. In this case, 34 metres multiplied by 100 equals 3400 centimetres. Therefore, 34 metres is the same as 3400 cm.
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14.
34 metres is the same as
A.
340 cm
B.
3400 mm
C.
34000 cm
D.
34000 mm
Correct Answer D. 34000 mm
Explanation To convert metres to millimetres, we multiply by 1000. Therefore, 34 metres is equal to 34,000 millimetres.
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15.
570, 000 mm is the same as
A.
57 m
B.
570 m
C.
570 cm
D.
0.57 km
Correct Answer(s) B. 570 m D. 0.57 km
Explanation 570,000 mm is equal to 570 meters because there are 1,000 millimeters in a meter. Additionally, 570,000 mm is equal to 0.57 kilometers because there are 1,000 meters in a kilometer.
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16.
A rectangle measuring 10 m x 25 m has an area of
A.
2, 500, 00 cm²
B.
25, 000 cm²
C.
250 cm²
D.
2500 m²
Correct Answer A. 2, 500, 00 cm²
Explanation The given rectangle has dimensions of 10 m x 25 m. To find the area, we multiply the length and width of the rectangle. Converting the dimensions to centimeters, we get 1000 cm x 2500 cm. Multiplying these values gives us an area of 2,500,000 cm², which matches the given answer of 2,500,00 cm².
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17.
1 cm³ has a capacity of
A.
10 mL
B.
100 mL
C.
1 mL
Correct Answer C. 1 mL
Explanation The capacity of 1 cm³ is 1 mL. This is because 1 cm³ is equal to 1 milliliter. The conversion factor between cubic centimeters and milliliters is 1:1, meaning that they have the same volume. Therefore, 1 cm³ has a capacity of 1 mL.
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18.
1 L of water has a mass of
A.
10 kg
B.
1 kg
C.
100 g
D.
100 kg
Correct Answer B. 1 kg
Explanation The density of water is 1 g/mL or 1 kg/L. Therefore, 1 L of water has a mass of 1 kg.
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19.
1 cm³ = 1 mL = 1 gm (water)
A.
True
B.
False
Correct Answer A. True
Explanation The statement is true because 1 cm³ is equal to 1 mL, and 1 mL of water weighs 1 gram. This is because water has a density of 1 gram per milliliter. Therefore, 1 cm³ is equal to 1 gram of water.
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20.
1 m³ of water = 1000 L, with a mass of
A.
100 kg
B.
10 tonnes
C.
1 tonne
D.
1000 g
Correct Answer C. 1 tonne
Explanation The given question is asking for the mass of 1 m³ of water. It is known that 1 m³ of water is equal to 1 tonne. Therefore, the correct answer is 1 tonne.
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