1.1 Various options are provided as possible answers to the following questions - NSC Agricultural Technology - Question 1 - 2021 - Paper 1
Question 1
1.1 Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1.... show full transcript
Worked Solution & Example Answer:1.1 Various options are provided as possible answers to the following questions - NSC Agricultural Technology - Question 1 - 2021 - Paper 1
Step 1
1.1.1 A part where lubricants are applied to a bearing preventing it from seizing on the shaft.
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Answer
The correct answer is C) Grease nipple. A grease nipple, also known as a grease fitting, is a small device that allows a grease gun to pump lubricating grease into a bearing or other component.
Step 2
1.1.2 Electricity, heat, and noise are examples of ... hazards.
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The correct answer is D) physical. Physical hazards refer to environmental factors that can harm an employee, such as electricity, heat, and noise.
Step 3
1.1.3 ... is not sold as a stand-alone motor fuel, although in its pure form it is commonly used as racing fuel.
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Answer
The correct answer is A) Ethanol. Ethanol is often used as a fuel additive and in various racing applications due to its high octane rating.
Step 4
1.1.4 A travelling sprinkler gun uses a ... pipe that winds around a steel drum while the sprinkler travels across a field to water the crop.
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The correct answer is B) steel. Steel is commonly used for durability and strength in travelling sprinkler systems.
Step 5
1.1.5 ... irrigation applies water directly to the roots of a plant.
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Answer
The correct answer is A) Drip. Drip irrigation is a method that delivers water directly to the roots of plants using a network of tubing.
Step 6
1.1.6 Farm implements and tractor spares must comply with certain requirements, e.g., interchangeability. This is known as ...
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Answer
The correct answer is D) standardisation. Standardisation ensures that parts are interchangeable and function correctly across different systems.
Step 7
1.1.7 A ... water purification system can be installed on the water delivery system of a farmhouse to remove impurities from borehole water.
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Answer
The correct answer is A) reverse osmosis. Reverse osmosis is a widely used filtration technology for water purification.
Step 8
1.1.8 Round bales weigh between ...
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The correct answer is A) 1 000 kg and 3 500 kg. Round bales typically fall within this weight range, depending on their size and density.
Step 9
1.1.9 A ... separates the grounded material effectively from the air in the hammer mill.
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Answer
The correct answer is C) cyclone. A cyclone is used in hammer mills to separate grounded material from air based on centrifugal force.
Step 10
1.1.10 Which ONE of the following CANNOT cause a power take-off shaft to fail when providing drive to a baler?
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The correct answer is A) A work angle less than 20 degrees. This angle typically avoids excessive wear and strain on the components.
Step 11
1.2.1 A speedometer is installed on a harvester to measure the quantity of the harvested crop.
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Answer
The underlined word should be changed to 'harvesting'. A speedometer is not used in this context; instead, a yield monitor is used.
Step 12
1.2.2 Manganese is the only alloy element that does not attribute to the corrosive resistant property of stainless steel.
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The underlined word should be changed to 'chromium'. Chromium is the key alloy in stainless steel that provides corrosion resistance.
Step 13
1.2.3 A system of pulleys, belts, and chains keeps the weight of the cylindrical bale constant while it is turning.
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The underlined word should be changed to 'speed'. This mechanism maintains the speed of rotation rather than weight.
Step 14
1.2.4 Compressed air is used as a hydraulic fluid in the bottle jack of a car.
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Answer
The underlined word should be changed to 'hydraulic fluid'. Typically, hydraulic oil is used instead of compressed air.
Step 15
1.2.5 Oxygen is a poisonous gas released by a motor vehicle.
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The underlined word should be changed to 'carbon monoxide'. Carbon monoxide is the toxic gas emitted by vehicles.
Step 16
1.3.1 An instrument used to measure the rate of evapotranspiration in a crop.
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The correct answer is A) feel method. This method allows the assessment of water loss through evapotranspiration.
Step 17
1.3.2 A method used to measure the moisture content of soil.
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The correct answer is B) evaporation pan. This device helps determine soil moisture levels by measuring evaporation.
Step 18
1.3.3 A mechanical connection that allows two connected shafts to rotate at an angle.
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Answer
The correct answer is D) differential lock. It enables power transfer between shafts at different speeds.
Step 19
1.3.4 Prefers technological advancement using the use of animal-drawn implements.
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The correct answer is C) mechanisation. Mechanisation refers to the use of technology to improve agricultural practices.
Step 20
1.3.5 Is built into the drive system of a vehicle.
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The correct answer is E) rain meter. This device is part of the vehicle's drive system, regulating performance in response to rain.
