WA1 Practice Paper: Weighted Assessment 1 — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer in the brackets provided.

1. 1

   A student records how the temperature of hot water changes as it cools over 10 minutes. Which pair of instruments does she need?

   1. Athermometer and stopwatch
   2. Bthermometer and electronic balance
   3. Cruler and stopwatch
   4. Dmeasuring cylinder and thermometer
   ( )
2. 2

   A measuring cylinder contains 45.0 cm³ of water. A stone of mass 27.0 g is lowered into the water and the reading rises to 55.0 cm³. What is the density of the stone?

   1. A0.37 g/cm³
   2. B0.49 g/cm³
   3. C2.7 g/cm³
   4. D10 g/cm³
   ( )
3. 3

   A bottle shows a hazard symbol of a flame over a circle. What does this symbol mean?

   1. Aflammable
   2. Boxidising
   3. Cexplosive
   4. Dcorrosive
   ( )
4. 4

   Why is the luminous flame used as the “safety flame” when a Bunsen burner is not being used for heating?

   1. AIt is the hottest flame.
   2. BIt produces no soot.
   3. CIt uses no gas.
   4. DIt is easy to see.
   ( )
5. 5

   A student investigates whether the length of a pendulum affects the time for one swing. What is the independent variable?

   1. Athe length of the pendulum
   2. Bthe time for one swing
   3. Cthe mass of the pendulum bob
   4. Dthe number of swings timed
   ( )
6. 6

   Copper is used to make electrical wires. Which properties make copper suitable?

   1. AIt conducts heat poorly and is strong.
   2. BIt conducts electricity poorly and breaks easily.
   3. CIt is hard and has a low density.
   4. DIt conducts electricity well and is flexible.
   ( )
7. 7

   Material P scratches material Q, and material Q scratches material R. Which shows the materials in order from hardest to softest?

   1. AQ, P, R
   2. BR, Q, P
   3. CP, Q, R
   4. DP, R, Q
   ( )
8. 8

   Water has a density of 1.0 g/cm³. Which object floats in water?

   1. Aa cork with a density of 0.24 g/cm³
   2. Ba stone with a density of 2.6 g/cm³
   3. Can iron nail with a density of 7.9 g/cm³
   4. Da glass marble with a density of 2.5 g/cm³
   ( )
9. 9

   Why are the handles of cooking pots often made of plastic or wood?

   1. AThey are good conductors of heat.
   2. BThey are poor conductors of heat.
   3. CThey are good conductors of electricity.
   4. DThey have a high density.
   ( )
10. 10

    A substance melts at −20 °C and boils at 80 °C. What is its state at 25 °C?

    1. Asolid
    2. Bliquid
    3. Cgas
    4. Da mixture of solid and gas
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show your working for calculations.

1. 1

   A student heats 20 cm³ of water in a boiling tube using a Bunsen burner.

   1. (a)

      Name the apparatus she should use to measure out 20 cm³ of water.

      [1]
   2. (b)

      State two safety precautions she should take while heating the boiling tube.

      [2]
   3. (c)

      Explain why she should heat the water with the non-luminous flame and not the luminous flame.

      [2]
2. 2

   A rectangular block measures 3.0 cm × 2.0 cm × 3.0 cm. Its mass is 54 g.

   1. (a)

      Calculate the volume of the block.

      volume =cm³[1]
   2. (b)

      Calculate the density of the block.

      density =g/cm³[2]
   3. (c)

      Water has a density of 1.0 g/cm³. Predict whether the block floats or sinks in water. Explain your answer.

      [2]
3. 3

   Table 3.1 shows some properties of four materials, W, X, Y and Z.

   Table 3.1

   Material	Conducts electricity?	Conducts heat?	Flexible?	Melting point / °C
   W	yes	well	yes	1085
   X	no	poorly	yes	120
   Y	no	poorly	no	1700
   Z	yes	well	no	1538

   1. (a)

      Which material is most suitable for the inside of an electrical wire? Give a reason.

      [2]
   2. (b)

      Which material is most suitable for the plastic covering around the wire? Give a reason.

      [2]
   3. (c)

      Which material is most suitable for lining the inside of a furnace?

      [1]
4. 4

   A student investigates how the temperature of water affects the time taken for 5 g of sugar to dissolve.

   1. (a)

      Identify the independent variable.

      [1]
   2. (b)

      Identify the dependent variable.

      [1]
   3. (c)

      State two variables that must be kept the same.

      [2]
   4. (d)

      Why should she repeat the experiment at each temperature?

      [1]