Natural Sciences And Technology Grade 6 November 2014 Memo

Downloaded from hlayiso.com INTERMEDIATE PHASE GRADE 6 NOVEMBER 2014 NATURAL SCIENCES AND TECHNOLOGY MEMORANDUM MARKS: 80 This memorandum consists of 7 pages.

Downloaded from hlayiso.com 2 NATURAL SCIENCES AND TECHNOLOGY (NOVEMBER 2014) QUESTION 1 1.1 C 1.2 C 1.3 C 1.4 B 1.5 B (5 x 1) [5] QUESTION 2 2.1 E 2.2 C 2.3 A 2.4 F 2.5 D (5 x 1) [5] QUESTION 3 3.1 Switch  3.2 Watts  3.3 Mars  3.4 SALT  3.5 Space Rovers  (5 x 1) [5] Copyright reserved Please turn over

Downloaded from hlayiso.com (NOVEMBER 2014) NATURAL SCIENCES AND TECHNOLOGY 3 QUESTION 4 4.1 4.1.1  Cells/battery   Conductor   Light bulb  (3 x 1) (3) 4.1.2 Cells provide energy in an electric circuit. (1) 4.2 A – Switch  B – Light bulb  C – Conductor  D – Cell  (4 x 1) (4) 4.3 The components of a circuit are not properly connected.  (2) (Any relevant answer to be marked.) 4.4 4.4.1 INSULATORS CONDUCTORS Wood  Iron nail  Rubber band  (3) 4.4.2  Copper wire is a good conductor of electricity.   It does not corrode easily.   It is not too expensive.  (Any two correct responses may be accepted.) (Any 2 x 2) (4) 4.4.3  They do not allow electricity to pass through them.   They are used wherever there is danger of someone getting an electric shock.   To prevent/avoid a short circuit.  (One relevant response.) (Any 1 x 1) (1) [18] Copyright reserved Please turn over

Downloaded from hlayiso.com 4 NATURAL SCIENCES AND TECHNOLOGY (NOVEMBER 2014) QUESTION 5 5.1 5.1.1 DESIGN BRIEF:  To design and make an alarm to protect the building.   It will use a two-cell series battery (3 volts) and will use a buzzer as a warning device.   The alarm will be activated by a secret switch hidden under the door mat.  (3 x 2) (6) 5.1.2 INPUT PROCESS OUTPUT Cells give energy Thief steps on to the The buzzer makes a to the circuit mat and close the noise when the circuit is containing a secret switch. Electric closed.  (1) buzzer and secret current runs through switch.  (1) wires and makes the buzzer buzz.  (2) (4) 5.1.3 The circuit may have broken parts so there is no current flowing in it.  (Any relevant answer is acceptable.) (1) 5.2 5.2.1 TV set, electric stove, electric fan, electric toaster, electric iron, etc.  (Any relevant answer is acceptable.) (5) 5.2.2 Watch TV for entertainment, electric stove cooks food so that we can remain alive, electric fan helps during hot day to cool our bodies, etc.  (Any relevant answer is acceptable.) (4) 5.2.3 We have to pay for electricity because it is expensive to generate and government has to receive money to keep these power stations going.  (Any relevant answer is acceptable.) (2) [22] Copyright reserved Please turn over

Downloaded from hlayiso.com (NOVEMBER 2014) NATURAL SCIENCES AND TECHNOLOGY 5 QUESTION 6 6.1 Earth,  Sun,  Moon  (3) 6.2 Thousands of little pieces of rocks and small stones between Jupiter and Mars that orbits the sun.  (1) 6.3 8 planets (1) 6.4 Alternative home will need:  Oxygen   Liquate water   Protect ultra-violet radiation   Protection from solar wind   Solid surface   Gravity similar to earth.  (Any two relevant answers are acceptable.) (2) 6.5  Earth is closer to the sun.   There is stronger force of gravity acting on it.   To avoid being dragged into the sun, Earth must travel a bit faster than Mars.  (Any two relevant answers are acceptable.) (2) 6.6 Yes, the moon shines by reflecting the light of the sun.  (3) 6.7  Earth’s atmosphere contains oxygen.   Earth is the only planet with liquid water.  (Any one answer is acceptable.) (1) 6.8 There is no oxygen on the moon.  (1) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com 6 NATURAL SCIENCES AND TECHNOLOGY (NOVEMBER 2014) QUESTION 7 7.1 Different model rovers Give a mark for each of the following  The X-axis labelled   The Y-axis labelled   Each point plotted accurately   Points joined by bars   Neatness  (7) 7.2  Wheels made of wire mesh   Electric motors to drive each wheel   Solar panels to recharge batteries   Cameras to take photographs  (Any other relevant explanation is acceptable.) (Any 2 x 1) (2) 7.3  It is very dangerous due to the distance.   It will be extremely expensive.  (2) [11] TOTAL: 80 Copyright reserved Please turn over

Downloaded from hlayiso.com (NOVEMBER 2014) NATURAL SCIENCES AND TECHNOLOGY 7 RUBRIC FOR MARKING 5.1.1 Criteria LEVEL DESCRIPTORS Level 4 Level 3 Level 2 Level 1 Is able to suggest many Is able to suggest and Can suggest and record Is unable to suggest DESIGN BRIEF alternative responses record at least two one possible solution to and record any SPECIFICATION AND for an alarm to work so possible solutions to the problem. solution to the CONSTRAINTS as to protect the solve the problem. problem. building. MARKS RANGE 6 4 2 0