Worksheet Solutions: Science Fair Project Ideas - 2 | DIY Science Fun: Cool School Projects - Class 6 PDF Download

Fill in the Blanks

Q1: In the Light Travels in a Straight Line Experiment, we explore the concept of __________ propagation of light.
Ans: rectilinear

Q2: The working model of lungs offers insights into the functioning of the __________ system.
Ans: respiratory

Q3: The Floating Egg Science Experiment helps us understand the concept of __________ and its behavior in different solutions.
Ans: density

Q4: The Homemade Compass Science Project explores the properties of __________ and their role in navigation.
Ans: magnets

Q5: The Rocket Balloon Science Project demonstrates Newton's __________ law of motion.
Ans: third

Multiple Choice Questions

Q1: In the Light Travels in a Straight Line Experiment, what is used to observe how light travels in a straight path?
(a) Mirror
(b) Lens
(c) Cardboard
(d) Prism
Ans: (c) Cardboard
In the experiment, cardboard with aligned holes is used to observe how light travels in a straight path.

Q2: What organ does the Working Model of Lungs science project focus on?
(a) Liver
(b) Kidneys
(c) Lungs
(d) Stomach
Ans: (c) Lungs
The Working Model of Lungs project focuses on the function and importance of the lungs in the respiratory system.

Q3: What concept does the Floating Egg Science Experiment teach us about?
(a) Magnetism
(b) Density
(c) Electricity
(d) Temperature
Ans: (b) Density
The Floating Egg Science Experiment helps us understand the concept of density and its behavior in different solutions.

Q4: What is used as a freely suspended indicator in the Homemade Compass Science Project?
(a) Paper clip
(b) Rubber band
(c) Bar magnet
(d) Paper
Ans: (c) Bar magnet
In the Homemade Compass project, a bar magnet is used as a freely suspended indicator to point towards the north and south poles.

Q5: What scientific principle is demonstrated by the Rocket Balloon Science Project?
(a) Archimedes' principle
(b) Bernoulli's principle
(c) Newton's first law of motion
(d) Newton's third law of motion
Ans: (d) Newton's third law of motion
The Rocket Balloon Science Project demonstrates Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

True and False (5 points each)

Q1: True or False: In the Light Travels in a Straight Line Experiment, we use a lens to bend light.
Ans: False
False. In the experiment, we use a cardboard with aligned holes to observe the rectilinear propagation of light, not a lens.

Q2: True or False: The Working Model of Lungs project helps us understand the functioning of the circulatory system.
Ans: False
False. The Working Model of Lungs project focuses on the respiratory system, not the circulatory system.

Q3: True or False: The Floating Egg Science Experiment is related to the study of chemistry.
Ans: True
True. The Floating Egg Science Experiment explores the behavior of an egg in different solutions, which is a chemistry-related concept.

Q4: True or False: The Homemade Compass in the science project uses a paper clip as the indicator.
Ans: False
False. The Homemade Compass project uses a bar magnet as the freely suspended indicator.

Q5: True or False: The Rocket Balloon Science Project demonstrates the principle of buoyancy.
Ans: False
False. The Rocket Balloon Science Project demonstrates Newton's third law of motion, not the principle of buoyancy.

Short Answer Questions (10 points each)

Q1: Explain the concept of rectilinear propagation of light in the Light Travels in a Straight Line Experiment.
Ans: Rectilinear propagation of light is the principle that light travels in straight lines. In the Light Travels in a Straight Line Experiment, we use a cardboard with aligned holes to observe this phenomenon. When light passes through the aligned holes, it continues to travel in a straight path, demonstrating that light does not bend or change direction unless it encounters an obstacle or a medium with different optical properties. This experiment helps us understand how light travels and behaves when it encounters openings in a material.

Q2: Describe the significance of the Working Model of Lungs science project and what it helps students learn.
Ans: The Working Model of Lungs science project is significant because it provides students with a hands-on opportunity to learn about the respiratory system and the functioning of the lungs. By creating a model of the lungs, students can visualize how the expansion and contraction of the lungs allow us to breathe and exchange oxygen and carbon dioxide. This project enhances students' understanding of the vital role of the lungs in the respiratory process and the importance of maintaining healthy respiratory functions. It also inspires curiosity about human anatomy and physiology.

Q3: In the Floating Egg Science Experiment, explain why an egg may float in one solution and sink in another.
Ans: In the Floating Egg Science Experiment, the behavior of the egg depends on the density of the solution it is placed in. An egg will float in a solution where its density is lower than that of the solution. This occurs when the solution has a higher concentration of solute (e.g., salt) and a higher density than water. The egg sinks in pure water because its density is greater than that of water. Therefore, the experiment demonstrates how changes in the density of the surrounding solution can cause objects like an egg to either float or sink.

Q4: How does a Homemade Compass work, and what role does the bar magnet play in it?
Ans: A Homemade Compass works by utilizing the magnetic properties of a bar magnet. The bar magnet is freely suspended, allowing it to align itself with the Earth's magnetic field. One end of the bar magnet typically points to the Earth's magnetic north pole, while the other end points to the south pole. When the Homemade Compass is placed in a horizontal position, the bar magnet aligns itself, indicating the north and south directions. This alignment happens because the north pole of the bar magnet is attracted to the Earth's magnetic north pole, and the south pole is attracted to the Earth's magnetic south pole. The bar magnet serves as the indicator, helping us determine direction.

Q5: Explain the principle demonstrated by the Rocket Balloon Science Project and provide an example of how this principle is used in everyday life.
Ans: The Rocket Balloon Science Project demonstrates Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this experiment, when air is rapidly expelled from the inflated balloon, the balloon experiences a force in the opposite direction, causing it to move forward. This action-reaction pair of forces is evident in the balloon's forward motion. An example of this principle in everyday life is the propulsion of rockets. Rockets use the same principle to achieve liftoff and travel in space. When rocket engines expel high-speed exhaust gases backward, the rocket experiences an equal and opposite force propelling it forward into space. This principle of action and reaction is crucial in space exploration and rocketry.