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MDCATBiology · Unit 3
08:42

Which structure regulates the passage of water into a plant cell during osmosis?

Cell wall
Partially permeable membrane
CVacuole
DChloroplast
Explanation according to marking scheme

The cell wall is fully permeable, so it can't control water movement — that's why A tempts you. Osmosis is regulated by the partially permeable membrane.

A LevelChemistry · Unit 7
11:05

Increasing the pressure on an equilibrium mixture of N₂ + 3H₂ ⇌ 2NH₃ shifts the position of equilibrium…

To the left, favouring the reactants
To the right, favouring ammonia
CNot at all — pressure has no effect
DLeft, because the forward reaction is exothermic
Explanation according to marking scheme

Le Chatelier's principle shifts equilibrium toward the side with fewer gas moles. Four moles on the left, two on the right — so it moves toward the ammonia. D confuses a pressure change with a temperature one.

O LevelPhysics · Unit 5
06:20

A 2 kg trolley accelerates from rest to 6 m/s in 3 s. What resultant force acts on it?

A12 N
4 N
36 N
D2 N
Explanation according to marking scheme

Find the acceleration first: (6 − 0) ÷ 3 = 2 m/s². Then F = ma = 2 × 2 = 4 N. C comes from multiplying by the velocity instead of the acceleration.

MDCATLogical Reasoning · Unit 2
04:58

All surgeons are doctors. Some doctors are researchers. Which statement must be true?

Some surgeons are researchers
BAll researchers are doctors
Some doctors are surgeons
DNo researcher is a surgeon
Explanation according to marking scheme

"All surgeons are doctors" guarantees the reverse overlap, so some doctors are surgeons. A only *might* be true — the two subsets of doctors need not touch, and assuming they do is the classic trap here.

IGCSEMathematics · Unit 4
09:31

The gradient of the line passing through (2, 3) and (6, 11) is…

2
½
C8
D4
Explanation according to marking scheme

Gradient is rise over run: (11 − 3) ÷ (6 − 2) = 8 ÷ 4 = 2. B is the same two numbers divided the wrong way round.

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Cambridge Assessment International EducationO Level & IGCSE

Cambridge O Level & IGCSE

Topic-wise MCQs plus written theory questions, marked against the Cambridge mark scheme.

  • Biology 0610/5090
  • Chemistry 0620/5070
  • Sociology 0495 /2251
  • Environmental Management 0680
  • Mathematics 4024/0580
  • Additional Mathematics 4037/0606
  • Physics 0625/5054
  • Pakistan Studies 0448/2059
  • Computer Science 0478/2210
  • Islamiyat 0493/2058
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Cambridge Assessment International EducationAS & A Level

Cambridge AS & A Level

AS and A Level topics at full difficulty, with structured theory answers marked the way an examiner marks them.

  • Chemistry 9701
  • Sociology 9699
  • Mathematics 9709
  • Biology 9700
Pearson EdexcelIGCSE & GCSE

Pearson Edexcel International GCSE

Topic-wise MCQs plus written theory questions, marked against the Edexcel mark scheme.

  • Biology (9-1)
  • Mathematics (9-1)
  • Chemistry (9-1)
  • Physics (9-1)
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    • Cambridge Assessment International Education

      Cambridge O Level & IGCSE

      O Level & IGCSE

      • Biology 0610/50905
      • Chemistry 0620/50702
      • Sociology 0495 /22512
      • Environmental Management 06801
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      Cambridge AS & A Level

      AS & A Level

      • Chemistry 97012
      • Sociology 96991
      • Mathematics 97092
      • Biology 97002
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