Worksheet Solutions: Fun and Creative Projects - 4 | DIY Science Fun: Cool School Projects - Class 6 PDF Download

Fill in the Blanks

Q1: The Candle Carousel is a rotating carousel that utilizes _______ energy for motion.
Ans: heat

Q2: To create the spinning effect in the Candle Carousel, you need to cut color paper into a _______ shape.
Ans: spiral

Q3: The circular cardboard serves as the _______ for the Candle Carousel project.
Ans: base

Q4: Convection is a natural process where _______ air rises.
Ans: hot

Q5: _______ is the primary source of power in the Candle Carousel experiment.
Ans: Candle

Q6: The rising hot air creates a _______ current in the Candle Carousel.
Ans: convection

Q7: The heated air in the Candle Carousel experiment causes the carousel to rotate in a _______ motion.
Ans: spiral

Q8: Students learn about _______ and heat transfer mechanisms through the Candle Carousel experiment.
Ans: convection

Q9: The influx of colder air completes the _______ process in the Candle Carousel.
Ans: convection

Q10: Wearing _______ is recommended to protect your eyes during the experiment.
Ans: safety glasses

Multiple Choice Questions

Q1: What source of energy does the Candle Carousel primarily use for rotation?
(a) Electric energy
(b) Manual effort
(c) Water energy
(d) Heat energy
Ans: (d) Heat energy
The Candle Carousel primarily uses heat energy from a candle for rotation.

Q2: What creates a convection current in the Candle Carousel experiment?
(a) Magnetic field
(b) Heat energy from the candle
(c) Manual spinning
(d) Water flow
Ans: (b) Heat energy from the candle
The heat energy from the candle creates a convection current, leading to the rotation of the carousel.

Q3: What scientific concept is primarily demonstrated by the Candle Carousel experiment?
(a) Magnetism
(b) Gravity
(c) Convection
(d) Friction
Ans: (c) Convection
The Candle Carousel experiment primarily demonstrates the concept of convection.

Q4: Why does the rising hot air in the Candle Carousel create a convection current?
(a) To generate electricity
(b) To create a vacuum
(c) To cool down
(d) To maintain equilibrium
Ans: (b) To create a vacuum
The rising hot air creates a convection current by creating a vacuum, which draws in colder air.

Q5: What safety measure is recommended to protect your eyes during the Candle Carousel experiment?
(a) Wearing gloves
(b) Using a face mask
(c) Wearing safety glasses
(d) Covering your ears
Ans: (c) Wearing safety glasses
Safety glasses are recommended to protect your eyes during the experiment to prevent potential hazards.

True and False

Q1: True or False: The Candle Carousel primarily uses electric energy for motion.
Ans: False
The Candle Carousel primarily uses heat energy, not electric energy, for motion.

Q2: True or False: The color paper in the Candle Carousel experiment is cut into a circular shape.
Ans: False
The color paper is cut into a spiral shape, not a circular one.

Q3: True or False: Convection is the process of cold air rising.
Ans: False
Convection is the process of hot air rising, not cold air.

Q4: True or False: The Candle Carousel project can be suitable for science fair presentations.
Ans: True
The Candle Carousel project is suitable for science fair presentations, especially for students in lower grades.

Q5: True or False: Wearing safety glasses is recommended during the experiment to protect your hands.
Ans: False
Safety glasses are recommended to protect your eyes, not your hands, during the experiment.

Short Answer Questions

Q1: Explain the primary source of power in the Candle Carousel experiment and how it initiates motion.
Ans: The primary source of power in the Candle Carousel experiment is a candle, which provides heat energy. When the candle is lit, it produces heat, causing the air surrounding the flame to become hot. Hot air is less dense and rises. As the hot air rises, it creates a region of lower pressure beneath it, effectively creating a convection current. To fill this void, cooler air flows in, and this cycle of rising hot air and incoming cooler air continues. The convection current, generated by the heat from the candle, initiates the motion of the Candle Carousel as it rises and creates a vacuum, leading to the rotation of the carousel.

Q2: Describe the scientific concept of convection as demonstrated in the Candle Carousel experiment.
Ans: Convection, as demonstrated in the Candle Carousel experiment, is the process of heat transfer through the movement of fluids, such as air or liquids. In this experiment, the heat energy from the candle heats the surrounding air, making it less dense and causing it to rise. As the hot air rises, it creates a convection current, which is a continuous cycle of rising hot air and incoming cooler air. This convection current is responsible for the motion of the Carousel as it creates a vacuum beneath it, leading to the rotation of the carousel in a spiral motion. The experiment vividly illustrates the principles of convection, showing how hot air rises and cooler air replaces it, resulting in motion.

Q3: Why is the Candle Carousel experiment an engaging and educational project for students?
Ans: The Candle Carousel experiment is engaging and educational for students for several reasons. First, it involves a hands-on approach that allows students to observe and interact with scientific phenomena. Second, it introduces the concept of convection in a tangible and visually appealing manner, making it easier for students to grasp. Third, it sparks curiosity by demonstrating how heat energy from a candle can lead to motion. This curiosity fosters a deeper interest in the field of science. Additionally, the experiment is accessible and uses readily available materials, making it suitable for students of various age groups. Overall, the Candle Carousel experiment combines practicality, engagement, and educational value, making it an ideal science project for students.

Q4: Why is safety important in the Candle Carousel experiment, and what safety measure is recommended?
Ans: Safety is important in the Candle Carousel experiment to prevent potential hazards and ensure a safe learning environment. The experiment involves the use of fire from a lit candle, which can pose risks if not handled carefully. To protect the eyes from potential hazards, wearing safety glasses is recommended during the experiment. Safety glasses help shield the eyes from any accidental splashes or sparks that may occur while lighting the candle or observing the carousel's motion. Additionally, the experiment should be performed under the supervision of parents, teachers, or responsible adults who can provide guidance and ensure safety protocols are followed. Safety measures are crucial to prevent accidents and ensure a safe and enjoyable learning experience during the experiment.

Q5: Describe the role of the rising hot air and the creation of a vacuum in the Candle Carousel experiment's rotation.
Ans: In the Candle Carousel experiment, the rising hot air plays a central role in initiating the rotation of the carousel. When the candle is lit, it produces heat, causing the air surrounding the flame to become hot. Hot air is less dense than cold air and tends to rise. As the hot air rises, it creates an area of lower pressure beneath it, effectively creating a vacuum. This vacuum is formed as the rising hot air creates a void or empty space beneath the carousel. Nature abhors a vacuum, so to fill this void, cooler air from the surroundings rushes in. The influx of this cooler air helps maintain equilibrium, and this cycle of rising hot air and incoming cooler air continues. As a result, the creation of a vacuum beneath the carousel, caused by the rising hot air, leads to the rotation of the carousel in a spiral motion. The carousel continues to rotate as long as the candle provides heat, sustaining the convection process and the creation of a vacuum.