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Science Practice Quiz 244
10 questions · 12 minutes
12:00
Q1.What type of reaction occurs when a cracker is ignited?
Explanation: When a cracker is ignited, the chemical composition undergoes a reaction producing heat, light, and sound, which is a chemical reaction. The explosion is the outcome of this reaction.
Q2.What is formed when materials like candle, magnesium, and camphor are burned?
Explanation: Materials like candle, magnesium, and camphor form a flame when burned, as shown in Table 4.2.
Q3.Why is it important to completely extinguish campfires before leaving a forest?
Explanation: It is important to remember that campfires must be completely extinguished before leaving a forest after a picnic or a visit, to prevent forest fires.
Q4.What is the primary characteristic of a good fuel?
Explanation: A good fuel is one which is readily available, cheap, burns easily in air at a moderate rate, produces a large amount of heat, and does not leave behind any undesirable substances.
Q5.What is the term used to describe the amount of heat energy produced on complete combustion of 1 kg of a fuel?
Explanation: The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value.
Q6.Why do goldsmiths use the outermost zone of a flame for melting gold and silver?
Explanation: Goldsmiths blow the outermost zone of a flame with a metallic blow-pipe for melting gold and silver because this part of the flame is the hottest.
Q7.What are the three main categories of fuels?
Explanation: Fuels can be grouped into three main categories: solid, liquid, and gaseous fuels.
Q8.What is an example of a solid fuel?
Explanation: Coal is an example of a solid fuel, as listed in Table 4.3.
Q9.What is the purpose of Table 4.3 in the text?
Explanation: Table 4.3 is used to group fuels into solid, liquid, and gaseous fuels, providing examples of each type.
Q10.Which of the following is a characteristic of an ideal fuel?
Explanation: A good fuel is one which is readily available, cheap, burns easily in air at a moderate rate, produces a large amount of heat, and does not leave behind any undesirable substances.
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