Grade 8 questions

A builder places a 2.9 m ladder on horizontal ground, resting against a vertical wall. To be safe to use, the base of this ladder must be 1.3 m away from the wall. How far up the wall does the ladder reach?

Give your answer to 1 decimal place.

• 2.5 m

• 3.1 m

• 2.6 m

• 3.2 m

Find the missing length y to 1 decimal place.

• 2.3 mm

• 4.7 mm

• 10.7 mm

• 11.9 mm

Work out the size of angle x correct to 2dp.

• 65.77^o

• 26.74^o

• 24.23^o

• 7.85^o

Which of these statements is incorrect?

-11 + 3(b + 5) = 7

• 1
• -1
• 3
• -3

The louder sound has a higher ………………

• Frequency

• Amplitude

• Wavelength

• Pitch

Plants need ………….. to make chlorophyll and ……………. to make proteins

• nitrates, magnesium

• magnesium, nitrates

• oxygen, methane

• carbon dioxide, amino acids

The bond in sodium chloride is …………… bond where the sodium atom …………. to chlorine atom.

• covalent, shares an electron

• ionic, shares an electron

• ionic, loses an electron

• covalent, loses an electron

When red, blue and green lights fall on a blue object. ……………are absorbed.

• red and blue

• red and green

• green and blue

• green and magenta

The enzyme ……………. is secreted in the mouth. It digests ……………….

• lipase, carbohydrates

• amylase, lipids

• protease, proteins

• amylase, carbohydrates