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Hong Kong · Grade 8 · Practice Sheet 20

Sheet code: HONG-KONG-G8-S20 · 20 questions

Name: ______________

Date: ______________

1.
A current of 5 A flows through a 12 Ω resistor. Find the voltage across it.
Formula:Ohm's Law
$V = I R$
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2.
HK$ 1,200 is invested at 8% simple interest per year for 2 years. Find the interest earned.
Formula:Simple Interest
$I = \dfrac{P \times r \times t}{100}$
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3.
A circle has a radius of 19 cm. Find its area. (Use π ≈ 3.14159)
Formula:Area of a Circle
$A = \pi r^2$
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4.
A current of 7.3 A flows through a 28 Ω resistor. Find the voltage across it.
Formula:Ohm's Law
$V = I R$
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5.
HK$ 150 is shared in the ratio 3 : 2. Find each share.
Formula:Dividing in a Ratio
$\text{share} = \dfrac{\text{part}}{\text{total parts}} \times T$
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6.
A car travels 237 km in 3 hours. Find its average speed.
Formula:Speed
$v = \dfrac{d}{t}$
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7.
A train moves at 86 km/h for 3.8 hours. How far does it travel?
Formula:Distance from Speed & Time
$d = v \times t$
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8.
HK$ 2,200 is invested at 10% simple interest per year for 2 years. Find the interest earned.
Formula:Simple Interest
$I = \dfrac{P \times r \times t}{100}$
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9.
A circle has a radius of 15 cm. Find its area. (Use π ≈ 3.14159)
Formula:Area of a Circle
$A = \pi r^2$
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10.
A triangle has a base of 7 cm and a height of 11 cm. Find its area.
Formula:Area of a Triangle
$A = \tfrac{1}{2} b h$
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11.
HK$ 252 is shared in the ratio 5 : 4. Find each share.
Formula:Dividing in a Ratio
$\text{share} = \dfrac{\text{part}}{\text{total parts}} \times T$
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12.
A current of 5.8 A flows through a 27 Ω resistor. Find the voltage across it.
Formula:Ohm's Law
$V = I R$
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13.
Find the mean (average) of these numbers: 59, 48, 76, 58.
Formula:Arithmetic Mean
$\bar{x} = \dfrac{\sum x}{n}$
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14.
Find the circumference of a circle whose radius is 7 m. (Use π ≈ 3.14159)
Formula:Circumference of a Circle
$C = 2\pi r$
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15.
A force of 49 N acts on an area of 2.7 m². Find the pressure.
Formula:Pressure
$P = \dfrac{F}{A}$
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16.
A triangle has a base of 34 cm and a height of 7 cm. Find its area.
Formula:Area of a Triangle
$A = \tfrac{1}{2} b h$
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17.
A circle has a radius of 19 cm. Find its area. (Use π ≈ 3.14159)
Formula:Area of a Circle
$A = \pi r^2$
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18.
A train moves at 35 km/h for 1.9 hours. How far does it travel?
Formula:Distance from Speed & Time
$d = v \times t$
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19.
A value changes from 47 to 211. Find the percentage change (to 2 d.p.).
Formula:Percentage Change
$\%\,\text{change} = \dfrac{\text{new} - \text{old}}{\text{old}} \times 100$
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20.
An object has mass 91.5 g and volume 15 cm³. Find its density.
Formula:Density
$\rho = \dfrac{m}{V}$
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