Question1:
What is a characteristic of all living organisms?
(A) excretion
(B) digestion
(C) photosynthesis
(D) sexual reproduction
▶️Answer/Explanation
Ans: A
Question2:
The diagram shows a typical plant cell.
▶️Answer/Explanation
Ans: D
Question3:
Which smaller molecules make up larger fat molecules?
(A) glucose and amino acids
(B) glucose and fatty acids
(C) glycerol and amino acids
(D) glycerol and fatty acids
▶️Answer/Explanation
Ans: D
Question4:
Which type of molecules are enzymes?
(A) carbohydrates
(B) fats
(C) oils
(D) proteins
▶️Answer/Explanation
Ans: D
Question5:
The rate of photosynthesis of an aquatic plant is measured by counting the number of bubbles of oxygen produced every minute, as shown. The rate is measured at different light intensities.
Which two variables need to be kept constant?
(A) size of plant and temperature of the water
(B) light intensity and size of the boiling tube
(C) size of plant and size of the boiling tube
(D) temperature of the water and light intensity
▶️Answer/Explanation
Ans: A
Question6:
Starch is mixed with saliva and placed into a bag made of a partially permeable membrane. The bag is placed into a tube filled with water, as shown.
After one hour, sugar molecules are found in the water outside the bag.
Which process has taken place inside the bag?
(A) assimilation
(B) digestion
(C) egestion
(D) ingestion
▶️Answer/Explanation
Ans: B
Question7:
What is transported by red blood cells?
(A) glucose
(B) insulin
(C) oxygen
(D) urea
▶️Answer/Explanation
Ans: C
Question8:
A person inflates a balloon by breathing into it.
What is the composition of the air in the balloon?
▶️Answer/Explanation
Ans: C
Question9:
A plant is placed in a box.
The box has a hole so that the plant is illuminated from one side.
The plant is observed after one week. The result is shown.
What explains the growth of the plant after one week?
(A) Plant shoots grow towards light, showing phototropism.
(B) Plant shoots grow towards gravity, showing gravitropism.
(C) Plant shoots grow towards light, showing gravitropism.
(D) Plant shoots grow towards gravity, showing phototropism.
▶️Answer/Explanation
Ans: A
Question10:
Which row is correct for sexual reproduction?
▶️Answer/Explanation
Ans: C
Question11:
The graph shows the masses of samples of two different types of potato, Y and Z.
What is shown by the graph?
(A) Genes do not affect the mass of potatoes.
(B) Type Y potatoes show continuous variation.
(C) Type Z potatoes are smaller than type Y.
(D) Type Z potatoes show discontinuous variation.
▶️Answer/Explanation
Ans: B
Question12:
A food chain is shown.
plant → insect → songbird → hawk
Which statements are correct?
1. The hawk is a consumer.
2. The insect is a carnivore.
3. The songbird is a herbivore.
4. The plant is a producer.
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 2 and 4
▶️Answer/Explanation
Ans: B
Question13:
Which process removes carbon dioxide from the atmosphere?
(A) combustion
(B) decomposition
(C) photosynthesis
(D) respiration
▶️Answer/Explanation
Ans: C
Question14:
Cyclopentane is a hydrocarbon.
The melting point of cyclopentane is –94 °C and its boiling point is 49 °C.
In process 1, the temperature of cyclopentane changes from 55 °C to 45 °C.
In process 2, the temperature of cyclopentane changes from –100 °C to –90 °C.
Which row identifies the changes in processes 1 and 2?
▶️Answer/Explanation
Ans: D
Question15:
Which statements about chemical changes are correct?
1. The separation of petroleum into gasoline, naphtha and diesel is a chemical change.
2. The separation of water into hydrogen and oxygen is a chemical change.
3. In a chemical change, a new substance is always formed.
4. In a chemical change, heat is always released.
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 3 and 4
▶️Answer/Explanation
Ans: C
Question16:
Which elements react together to form an ionic compound?
(A) carbon and oxygen
(B) nitrogen and hydrogen
(C) potassium and bromine
(D) sodium and lithium
▶️Answer/Explanation
Ans: C
Question 17:
Hydrogen peroxide is a compound.
A molecule of hydrogen peroxide can be represented as shown.
What is the formula of hydrogen peroxide?
(A) HO (B) H2O2 (C) H2O (D) 2OH
▶️Answer/Explanation
Ans: B
Question 18:
When concentrated aqueous sodium chloride is electrolyzed using inert electrodes, the remaining solution turns red litmus paper to blue.
Which substance causes this color change?
(A) chlorine
(B) hydrogen
(C) hydrochloric acid
(D) sodium hydroxide
▶️Answer/Explanation
Ans: D
Question 19:
When aqueous sodium hydroxide reacts with dilute hydrochloric acid, the temperature of the reaction mixture increases.
Ice cubes take in energy when they melt.
Which row is correct?
▶️Answer/Explanation
Ans: B
Question 20:
Dilute hydrochloric acid reacts with calcium carbonate.
The equation for the reaction is shown.
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
Which change increases the rate of the reaction?
(A) decreasing the temperature of the hydrochloric acid
(B) increasing the concentration of the hydrochloric acid
(C) increasing the size of the calcium carbonate particles
(D) increasing the volume of the hydrochloric acid
▶️Answer/Explanation
Ans: B
Question 21:
Which reactions involve oxidation?
1. C + O2 → CO2
2. 2NaOH + H2SO4 → Na2SO4 + 2H2O
3. 2Mg + O2 → 2MgO
4. CaCO3 → CaO + CO2
(A) 1 and 3 (B) 1 and 4 (C) 2 and 3 (D) 2 and 4
▶️Answer/Explanation
Ans: A
Question 22:
Salts are made when four substances react separately with dilute hydrochloric acid.
1. magnesium
2. magnesium carbonate
3. magnesium hydroxide
4. magnesium oxide
Which substances produce a gas when reacted with dilute hydrochloric acid?
(A) 1 and 2 (B) 1 and 3 (C) 2 and 4 (D) 3 and 4
▶️Answer/Explanation
Ans: A
Question 23:
Lead has a high density of 11.3 g/cm3. Lead(II) iodide is a bright yellow solid.
Which property of lead is not a property of a transition element?
(A) Lead conducts electricity.
(B) Lead forms alloys.
(C) Lead has a relatively low melting point.
(D) Lead(II) oxide is basic.
▶️Answer/Explanation
Ans: C
Question 24:
Which statements about the noble gas helium are correct?
1. It is unreactive.
2. Atoms of helium have two electrons in their outer electron shell.
3. Atoms of helium have incomplete outer electron shells.
4. The formula of helium gas is He2.
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 3 and 4
▶️Answer/Explanation
Ans: A
Question 25:
Water vapour, carbon dioxide and the noble gases are removed from a 100 cm3 sample of clean air.
What is the remaining volume?
(A) 1 cm3 (B) 21 cm3 (C) 78 cm3 (D) 99 cm3
▶️Answer/Explanation
Ans: D
Question 26:
Which statement about manufacturing processes is correct?
(A) Limestone is manufactured from calcium oxide.
(B) Limestone is manufactured from acidic waste products.
(C)Ethene is manufactured by addition polymerisation.
(D) Sulfuric acid is manufactured from sulfur.
▶️Answer/Explanation
Ans: D
Question27:
Which molecule reacts with aqueous bromine?
▶️Answer/Explanation
Ans: B
Question 28:
A car travels at constant speed. It is at point X at time = 0.
Which distance–time graph and speed–time graph represent the motion of the car?
▶️Answer/Explanation
Ans: A
Question 29:
The diagrams show all the forces acting on three objects, X, Y and Z .
Which of the objects experience a resultant force?
(A) X, Y and Z (B) X only (C) Y and Z only (D) Y only
▶️Answer/Explanation
Ans: C
Question 30:
A student places four identical beakers on a bench.
Two beakers contain salt water of density 1.1 g/cm3 and two beakers contain pure water of density 1.0 g/cm3. The quantity of water in each beaker is shown.
Which beaker exerts the greatest pressure on the bench?
▶️Answer/Explanation
Ans: A
Question 31:
The power rating of an electric kettle is 1500 W.
What does this mean?
(A) The kettle requires 1500 J to boil water.
(B) The kettle takes 1500 s to boil water.
(C) The kettle transfers 1500 J of energy every second.
(D) The weight of the kettle is 1500 N.
▶️Answer/Explanation
Ans: C
Question 32:
A glass jar in a warm room has a metal lid that is easy to remove.
The jar with the lid on is left in a refrigerator overnight.
In the morning, the lid of the jar is difficult to remove.
Which statement is an explanation of what happens when the jar is in the refrigerator?
(A) The glass jar contracted more than the metal lid.
(B) The metal lid contracted more than the glass jar.
(C) The glass jar expanded more than the metal lid.
(D) The metal lid expanded more than the glass jar.
▶️Answer/Explanation
Ans: B
Question 33:
A beaker contains water that is all at 20 °C.
A convection current is started in the water, as shown in the diagram.
Four points are labelled W, X, Y and Z.
Which two actions can each, on their own, cause this convection current?
(A) cooling the water at W or heating the water at Y
(B) cooling the water at W or heating the water at Z
(C) cooling the water at X or heating the water at Y
(D) cooling the water at X or heating the water at Z
▶️Answer/Explanation
Ans: D
Question 34:
Which type of electromagnetic wave is emitted by a television remote controller?
(A) gamma (ϒ)-rays
(B) infrared
(C) ultraviolet
(D) X-rays
▶️Answer/Explanation
Ans: B
Question 35:
An electric bell is suspended by a rubber band in a glass jar. The hammer hits the bell and makes it ring.
A pump removes air from the jar. The hammer still hits the bell but no sound can be heard.
Why does this happen?
(A) A medium is needed to transmit sound waves.
(B) The bell cannot vibrate in a vacuum.
(C) The pitch of the sound is now outside the range of human hearing.
(D) There cannot be an electric current in a vacuum.
▶️Answer/Explanation
Ans: A
Question 36:
A cell is connected in a circuit.
Which statement describes how the electromotive force (e.m.f.) of the cell is measured?
(A) It is measured in newtons using a newton meter connected in parallel with the cell.
(B) It is measured in newtons using a newton meter connected in series with the cell.
(C) It is measured in volts using a voltmeter connected in parallel with the cell.
(D) It is measured in volts using a voltmeter connected in series with the cell.
▶️Answer/Explanation
Ans: C
Question 37:
In the circuits shown, all the resistors are identical.
Which circuit has the smallest combined resistance?
▶️Answer/Explanation
Ans: B
Question 38:
The maximum current in an electric circuit is 10A.
What is the most appropriate rating of a fuse for this circuit?
(A) 5A (B) 9A (C) 13A (D) 25A
▶️Answer/Explanation
Ans: C
Question 39:
A current-carrying wire passes through a flat card.
The arrow on the wire shows the direction of the current.
Which diagram shows the pattern of the magnetic field on the card and the direction of the magnetic field lines?
▶️Answer/Explanation
Ans: D
Question 40:
A radioactive material has a half-life of 4.0 days. The rate of emission of radiation from a sample of the material is 32 emissions per minute.
What was the rate of emission from the sample 8.0 days earlier?
(A) 8.0 emissions per minute
(B) 128 emissions per minute
(C) 256 emissions per minute
(D) 1024 emissions per minute
▶️Answer/Explanation
Ans: B