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SEE Science and Technology model questions with answers

12 free practice questions for Grade 10, written in the pattern of recent SEE papers. Try each one, then tap “Show answer”.

Scientific Learning

Q1 · Scientific Learning · 2 marks · SEE Group C “check by unit analysis”, in 5 of 9 recent papers

Check whether the equation v² = u² + 2as is correct by comparing the units of both sides. (v, u = velocity, a = acceleration, s = distance)

(i)

What is the SI unit of the left side, v²?

  1. m/s²
  2. m²/s
  3. m²/s²
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(c) m²/s²

(m/s)² = m²/s². u² has the same unit.

(ii)

What is the SI unit of 2as?

  1. m/s
  2. m²/s²
  3. m²/s
  4. it depends on the 2
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(b) m²/s²

(m/s²) × m = m²/s²; the 2 has no unit. Every term is m²/s², so the equation is correct by units.

Q2 · Scientific Learning · 2 marks · SEE Group C “check by unit analysis”, in 5 of 9 recent papers

Force (F) × time (t) = mass (m) × velocity (v)

Using units, is this relation correct?

  1. No: the left is kg·m/s² and the right is kg·m/s
  2. No: the left is N and the right is J
  3. Yes: both sides are kg·m/s
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(c) Yes: both sides are kg·m/s

F × t = (kg·m/s²) × s = kg·m/s. m × v = kg × m/s = kg·m/s. Both sides match.

Q3 · Scientific Learning · 2 marks · SEE Group C “show the unit in base units”

Pressure = force ÷ area. Which is the unit of pressure in SI base units?

  1. kg·m⁻¹·s⁻²
  2. kg·m·s⁻²
  3. kg·m⁻²·s⁻¹
  4. kg·m²·s⁻²
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(a) kg·m⁻¹·s⁻²

(kg·m·s⁻²) ÷ m² = kg·m⁻¹·s⁻², which is one pascal.

Q4 · Scientific Learning · 1 mark · SEE Group B, 1 mark

Which fundamental units make up the newton?

  1. kilogram, metre, kelvin
  2. kilogram, metre, second
  3. metre, second, ampere
  4. kilogram and second only
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(b) kilogram, metre, second

1 N = 1 kg × 1 m/s², so it uses the kilogram, the metre and the second.

Q5 · Scientific Learning · 2 marks · SEE Group A/B “name the variable”, in 5 of 9 recent papers

Mina plants bean seeds in five pots. She gives each pot a different amount of water every day and measures the height of each plant after two weeks.

(i)

Name the independent variable.

  1. The height of the plants
  2. The type of seed
  3. The amount of water
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(c) The amount of water

Mina chooses a different amount of water for each pot, so water is the independent variable.

(ii)

Name the dependent variable.

  1. The height of the plants
  2. The amount of water
  3. The number of pots
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(a) The height of the plants

Height is measured to see how water affects growth, so it is the dependent variable.

Q6 · Scientific Learning · 1 mark · SEE Group A/B “name the variable”, in 5 of 9 recent papers

Bikash times how long ice cubes of different sizes take to melt in the same room.

What is the dependent variable?

  1. The size of the ice cube
  2. The temperature of the room
  3. The time taken to melt
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(c) The time taken to melt

He changes the size (independent), keeps the room the same (controlled) and measures melting time (dependent).

Q7 · Scientific Learning · 1 mark

Which of these is a fundamental quantity?

  1. Force
  2. Mass
  3. Pressure
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(b) Mass

Mass is one of the seven fundamental quantities. Force and pressure are derived.

Q8 · Scientific Learning · 1 mark

Build the dimensional formula of velocity.

Velocity = displacement ÷ time

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[M0 L1 T-1]

[L] ÷ [T] = [LT⁻¹]

Q9 · Scientific Learning · 2 marks

Build the dimensional formula of pressure.

Pressure = force ÷ area

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[M1 L-1 T-2]

[MLT⁻²] ÷ [L²] = [ML⁻¹T⁻²]

Q10 · Scientific Learning · 1 mark

The SI unit of pressure, the pascal, is the same as:

  1. N m
  2. N/m²
  3. kg m/s
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(b) N/m²

1 Pa = 1 N ÷ 1 m² = 1 N/m².

Q11 · Scientific Learning · 1 mark

Sita tests how water temperature affects how quickly sugar dissolves.

What is the dependent variable?

  1. The temperature of the water
  2. The amount of water
  3. The time the sugar takes to dissolve
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(c) The time the sugar takes to dissolve

She changes temperature (independent), keeps the amount of water the same (controlled) and measures dissolving time (dependent).

Q12 · Scientific Learning · 2 marks

Build the dimensional formula of kinetic energy.

KE = ½ × mass × velocity²

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[M1 L2 T-2]

[M] × [L²T⁻²] = [ML²T⁻²], the same as work.

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