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Question 1:-

Which processes are done by green plants?

1.   detect stimuli and make appropriate responses
2.  break down nutrient molecules to release energy for metabolism
3.  take in carbon dioxide, water and ions for energy, growth and development


(A) 1, 2 and 3            (B) 1 and 2 only             (C) 1 and 3 only                   (D) 2 and 3 only

▶️Answer/Explanation

Ans : A 

Question 2:-

Which conditions will result in the fastest rate of diffusion?

 

▶️Answer/Explanation

Ans : A 

Question 3:-

A sample of food is tested for reducing sugars by adding Benedict’s solution and heating. What indicates that reducing sugars are present?

(A) a blue-black colour
(B) a brick-red precipitate
(C) a purple colour
(D) a white emulsion

▶️Answer/Explanation

Ans : B 

Question 4:-

Which statement about denaturation is correct?

(A) Denaturation is the change in shape of the active site of the enzyme at a pH above the optimum pH.
(B) Denaturation is the change in shape of the active site of the enzyme at a temperature below the optimum temperature.
(C) Denaturation is the change in shape of the active site of the substrate at a pH below the optimum pH.
(D) Denaturation is the change in shape of the active site of the substrate at a temperature above the optimum temperature.

▶️Answer/Explanation

Ans : A

Question 5:-

The diagram shows a cross-section of a leaf of a plant.
The leaf is adapted to float on water with the upper epidermis exposed to the air.

                 

Which statement explains one adaptation visible in the diagram?
(A) Guard cells in the lower epidermis are always closed to stop water escaping the leaf.
(B) The palisade mesophyll cells are next to the lower epidermis to maximise photosynthesis.
(C) The stomata are in the upper epidermis so that gas exchange with the air can take place.
(D) There is no cuticle in the upper epidermis to prevent water entering the leaf.

▶️Answer/Explanation

Ans : C 

Question 6:-

Humans have different types of teeth. Which type of tooth is used for biting off food?

(A) canines
(B) incisors
(C) premolars
(D) molars

▶️Answer/Explanation

Ans : B 

Question 7:-

A student investigates the effect of humidity on transpiration rate.
A plant is placed on a balance for one hour as shown. The mass of the plant decreases.

         

The student repeats the experiment in air of higher humidity. What is the effect of increasing humidity?
(A) larger decrease in mass due to a steeper diffusion gradient of water
(B) larger decrease in mass due to a less steep diffusion gradient of water
(C) smaller decrease in mass due to a steeper diffusion gradient of water
(D) smaller decrease in mass due to a less steep diffusion gradient of water

▶️Answer/Explanation

Ans : D 

Question 8:-

A pupil runs to school.
What happens to the rate and depth of their breathing as they run?

     

▶️Answer/Explanation

Ans : D

Question 9:-

A person looks at a tree in the distance and then starts to read a book. Which changes occur in the eye to enable the person to read their book?

 

▶️Answer/Explanation

Ans : A 

Question 10:-

Which row describes asexual reproduction?

             


▶️Answer/Explanation

Ans : C 

Question 11:-

The diagram shows the inheritance of a disease.

 

▶️Answer/Explanation

Ans : B 

Question 12:-

How does an organism in the first trophic level gain energy?

(A) by absorbing energy from sunlight
(B) by breaking down dead or waste organic matter
(C) by eating organisms in the second trophic level
(D) by eating plants

▶️Answer/Explanation

Ans : A 

Question 13:-

The list shows changes that occur in a lake which is polluted by fertiliser.

1. Decomposers feed on aquatic plants.
2. Growth of algae increases.
3. Oxygen levels decrease in the lake.
4. Aquatic plants die.

In which order do these changes occur?
(A) 2 → 4 → 1 → 3
(B) 2 → 3 → 4 → 1
(C) 3 → 4 → 2 → 1
(D) 3 → 4 → 1 → 2

▶️Answer/Explanation

Ans : A 

Question 14:-

The initial and final readings on a sensitive thermometer used in an experiment are shown

What is the temperature change for this experiment?
(A) 0.4              (B) 4.0                (C) 6.8                   (D) 7.6

▶️Answer/Explanation

Ans : D 

Question 15:-

The boiling point of ammonia is –33ºC. The temperature of a sealed flask containing ammonia is changed from –35º C to –30ºC.

Which row describes and explains the type of change that happens in the flask?

▶️Answer/Explanation

Ans : C

Question 16:-

 Which dot-and-cross diagram represents the outer-shell electrons in a molecule of methanol?

▶️Answer/Explanation

Ans : A 

Question 17:-

Which statements describe the structure of silicon(IV) oxide?

1. Each oxygen atom is attached to two silicon atoms.
2. Each oxygen atom is attached to four silicon atoms.
3. Each silicon atom is attached to two oxygen atoms.
4. Each silicon atom is attached to four oxygen atoms.
(A) 1 and 3               (B) 1 and 4                 (C) 2 and 3                  (D) 2 and 4

▶️Answer/Explanation

Ans : B 

Question 18:-

The equation for the combustion of magnesium is shown.

                                 2Mg + O2 → MgO

What is the mass of magnesium oxide formed from 12 g of magnesium?
(A) 20g              (B) 24g                    (C) 40g                  (D) 80g

▶️Answer/Explanation

Ans : BA

Question 19:-

Two electrolysis experiments are done using inert electrodes. Experiment 1 is the electrolysis of aqueous copper(II) sulfate. Experiment 2 is the electrolysis of molten lithium bromide.

Which row describes the products at each electrode in these experiments?

▶️Answer/Explanation

Ans : C

Question 20:-

A piece of sodium is added to water.
Which row shows the type of reaction and the energy level diagram for the reaction?

▶️Answer/Explanation

Ans : D

Question 21:-

Magnesium ribbon is reacted with 50 cm3 of dilute hydrochloric acid.

Which change does not increase the rate of the reaction?

(A) Increase the concentration of the hydrochloric acid.
(B) Increase the temperature of the hydrochloric acid.
(C) Increase the volume of the hydrochloric acid.
(D) Use powdered magnesium.

▶️Answer/Explanation

Ans : C

Question 22:-

Which metal is used in the test for nitrate ions?

(A) aluminium
(B) copper
(C) magnesium
(D) tin

▶️Answer/Explanation

Ans : A

Question 23:-

Element X is a dense solid with a high melting point.

Which letter shows the position of X in the Periodic Table?

▶️Answer/Explanation

Ans : B 

Question 24:-

Which statement about noble gases is correct?

(A) All of the noble gas atoms have eight electrons in their outer shell.
(B) They all form diatomic molecules.
(C) Argon is used to fill weather balloons.
(D) They are all present in clean air in small amounts.

▶️Answer/Explanation

Ans : D 

Question 25:-

Which statements about the Haber process are correct?

1. The hydrogen used is obtained from the air.
2. The pressure used is about twice atmospheric pressure.
3. The catalyst used is iron.
4. The process takes place at a temperature of about 450 C.
(A) 1 and 2                (B) 1 and 4                       (C) 2 and 3              (D) 3 and 4

▶️Answer/Explanation

Ans : D

Question 26:-

The structure of a molecule of compound X is shown.

Which two formulas represent compounds that are in the same homologous series as X?
(A) C5H10 and C5H12
(B) C4H10 and C6H14
(C) C3H6 and C5H10
(D) C3H6 and C4H10

▶️Answer/Explanation

Ans : C

Question 27:-

Which molecules can be used as monomers in polymerisation processes?

(A) 1 and 2             (B) 1 and 3                 (C) 2 and 4                         (D) 3 and 4

▶️Answer/Explanation

Ans : B 

Question 28:-

Which statement describes a system that is in equilibrium?

(A) There is a resultant force and there is a resultant turning effect on the system.
(B) There is a resultant force but there is no resultant turning effect on the system.
(C) There is no resultant force but there is a resultant turning effect on the system.
(D) There is no resultant force and there is no resultant turning effect on the system.

▶️Answer/Explanation

Ans : D

Question 29:-

An irregularly shaped piece of aluminium is lowered into a measuring cylinder that contains 43 cm3 of water. The aluminium is totally immersed in the water and the water level in the measuring cylinder rises to 51 cm3 . The density of aluminium is 2.7 g/ cm3.

What is the mass of the aluminium?

(A) 15.9 g           (B) 18.9 g           (C) 21.6 g           (D) 127 g

▶️Answer/Explanation

Ans : C

Question 30:-

An object of mass 5.0 kg falls vertically from rest through a height of 13 m in a vacuum.

The gravitational field strength g is 10 N/ kg.

What is the final speed of the object?

(A) 8.1 m/s             (B) 10 m/s            (C) 11 m/s             (D) 16 m/s

▶️Answer/Explanation

Ans : D 

Question 31:-

For which energy resource is the Sun not the source of the energy?

(A) geothermal
(B) natural gas
(C) water behind a hydroelectric dam
(D) wind

▶️Answer/Explanation

Ans : A 

Question 32:-

In a room, hot air above a heater rises and is replaced by cool air that falls.

What is the name of this process, and how does the density of the hot air compare with the density of the cool air?

▶️Answer/Explanation

Ans : D 

Question 33:-

A wave has an amplitude, a frequency and a wavelength.

Three definitions for these quantities are given.

1. the maximum displacement from the rest position
2. the number of wavefronts passing a point in unit time
3. the distance between two adjacent wave crests

Which definition corresponds to each quantity?

▶️Answer/Explanation

Ans : A 

Question 34:-

A thin converging lens produces a real image of an object.

What happens to the image as the object is moved away from the lens?

(A) It becomes larger and stays inverted.
(B) It becomes larger and stays upright.
(C) It becomes smaller and stays inverted.
(D) It becomes smaller and stays upright.

▶️Answer/Explanation

Ans : C 

Question 35-

A bar of soft iron and a bar of steel are held in contact with a strong magnet.

Both bars become magnetised.

The two bars are now moved away from the magnet.

Which statement about the bars is correct?

(A) Both bars lose their magnetism.
(B) Neither of the bars loses its magnetism.
(C) The soft iron bar loses its magnetism but the steel bar retains its magnetism.
(D) The steel bar loses its magnetism but the soft iron bar retains its magnetism.

▶️Answer/Explanation

Ans : C

Question 36:-

The current in an ammeter is 1.5A.

How much charge passes through the ammeter in one minute?

(A) 0.025 C         (B) 1.5 C           (C) 40 C               (D) 90 C

▶️Answer/Explanation

Ans : D 

Question 37:-

Two resistors with different resistances are connected to a power supply. The resistors can be connected either in parallel or in series.

Which statement is correct?

(A) For resistors in parallel, the currents in the resistors are equal.
(B) For resistors in parallel, the potential differences (p.d.s) across the resistors are different.
(C) For resistors in series, the currents in the resistors are equal.
(D) For resistors in series, the potential differences (p.d.s) across the resistors are equal.

▶️Answer/Explanation

Ans : C 

Question 38:-

There is an alternating current (a.c.) in a metal wire.

Which statement about the current is correct?

(A) It is a flow of both positively and negatively charged particles.
(B) It is a flow of charged particles, first in one direction then in the opposite direction repeatedly.
(C) It is a flow of charged particles in both directions at the same time.
(D) It is a flow of charged particles steadily in one direction

▶️Answer/Explanation

Ans : B 

Question 39:-

A 100% efficient step-down transformer has 120 turns on its primary coil and 10 turns on its
secondary coil.

A 240V supply provides 48W of power to the primary coil.
What is the current in the secondary coil?

(A) 0.017A           (B) 0.2A               (C) 2.4A               (D) 20A

▶️Answer/Explanation

Ans : C

Question 40:-

A proton has charge q and mass m. A neutron has no charge and mass m.

Which row shows the charge and mass of an alpha (σ)-particle?

▶️Answer/Explanation

Ans : B 

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