2024 S2 Science Revision 2

Which of the following are properties of alkalis?
I) bitter taste

II) soapy feel

III) turns moist blue litmus red

• I and II only

• I and III only

• II and III only

• all the above

The table shows the colour of several indicators in solutions of varying pH.
A mixture of methyl orange, bromothymol blue and phenolphthalein is added to a solution

of pH 5. What is the colour of the resulting mixture?

• blue

• yellow

• purple

• orange

Complete the following word equations:

zinc oxide + sulfuric acid → .......................... + water

What are the missing substances in the word equation?

………………………. + nitric acid → sodium nitrate + ………………………… + water

• sodium hydroxide; hydrogen

• sodium hydroxide; carbon dioxide

• sodium; hydrogen

• sodium carbonate; carbon dioxide

Name the chemical reaction shown in the following word equation:

calcium carbonate ---> calcium oxide + carbon dioxide

• thermal decompostion
• oxidation

• combustion

• neutralisation

The diagram below shows a typical plant cell after being placed in solution A for

10 minutes. What could solution A be?

• distilled water

• concentrated salt solution

• dilute salt solution

• dilute sugar solution

The diagram shows a cross-section through the stem of a flowering plant. Which tissue transports sucrose through the stem?

• A

• B

• C

• D

What features of a red blood cell would make it an efficient transporter of oxygen to all

body cells?

• The red blood cell has a convex shape to increase rate of diffusion of

  oxygen.

• The red blood cell lacks a nucleus to increase more space to pack in more

  haemoglobin.

• The red blood cell has a lower surface area to volume ratio to increase rate

  of diffusion of oxygen.

• The red blood cell has an inelastic membrane.

A box of mass 20 kg is pulled 4.0 m along a horizontal floor by a force of 15 N. What is the work

done on the box?

• 60 J

• 300 J

• 800 J

• 1200 J

Wires P and Q are made of the same material and have the same diameter. Wire P is longer than

wire Q when uncoiled.

Which of the following correctly describes the resistance of wires P and Q?

• Wires P and Q have the same resistance.

• Wire P has half the resistance of wire Q.

• Wire P has one-third the resistance of wire Q.

• Wire P has larger resistance than wire Q.