Worksheet Solutions: Fun and Creative Projects - 1 | DIY Science Fun: Cool School Projects - Class 6 PDF Download

Fill in the Blanks

Q1: Battery-less flashlights reduce costs and promote the habit of ______________.
Ans: recycling

Q2: The main power source for the battery-less flashlight project is the ______________.
Ans: gear motor

Q3: LEDs are polarity-sensitive, meaning they only emit light in one direction of ______________ flow.
Ans: current

Q4: The mechanical flashlight project provides a valuable learning experience about ______________.
Ans: gear motors

Q5: Safety glasses should be worn to protect your ______________ while working on science projects.
Ans: eyes

Q6: ______________ is used to connect jumper wires to an LED's terminals.
Ans: Soldering iron

Q7: To create a handle for the flashlight, a simple ______________ is used.
Ans: metal rod

Q8: The flashlight's reflector can be repurposed from an old ______________.
Ans: flashlight

Q9: Hot melting glue is used to attach the LED to the ______________.
Ans: torchlight reflector

Q10: The battery-less flashlight eliminates the need for ______________.
Ans: batteries

Multiple Choice Questions

Q1: What is the primary advantage of creating a battery-less flashlight?
(a) Increased brightness
(b) Reduced cost and recycling
(c) Longer battery life
(d) Greater portability
Ans: (b) Reduced cost and recycling
Creating a battery-less flashlight reduces costs and promotes recycling, making it an environmentally friendly option.

Q2: What is the primary power source for the battery-less flashlight project?
(a) Batteries
(b) Solar panels
(c) Gear motor
(d) LEDs
Ans: (c) Gear motor
The gear motor serves as the main power source for the battery-less flashlight project.

Q3: Why is it important to connect jumper wires to the terminals of the LED in the flashlight project?
(a) To reduce the brightness of the LED
(b) To make the LED waterproof
(c) To connect it to a computer
(d) To enable soldering to other components
Ans: (d) To enable soldering to other components
Connecting jumper wires to the LED terminals allows it to be easily connected to other components like the gear motor.

Q4: What is the purpose of the metal rod in the flashlight project?
(a) To power the LED
(b) To attach the gear motor
(c) To create a handle for the flashlight
(d) To hold the batteries
Ans: (c) To create a handle for the flashlight
The metal rod is used to create a handle for the flashlight, allowing it to be carried easily.

Q5: Why is it important to wear safety glasses while working on science projects?
(a) To enhance vision
(b) To look stylish
(c) To protect eyes from potential hazards
(d) To prevent soldering accidents
Ans: (c) To protect eyes from potential hazards
Safety glasses are worn to protect the eyes from potential hazards and accidents during science projects.

True and False

Q1: True or False: Battery-less flashlights are not environmentally friendly.
Ans: False
Battery-less flashlights are environmentally friendly as they promote recycling and reduce the need for disposable batteries.

Q2: True or False: The main power source for the battery-less flashlight project is a solar panel.
Ans: False
The main power source for the project is a gear motor, not a solar panel.

Q3: True or False: LEDs emit light in all directions of current flow.
Ans: False
LEDs are polarity-sensitive and emit light in one direction of current flow.

Q4: True or False: Soldering iron is not used in the battery-less flashlight project.
Ans: False
Soldering iron is used to connect jumper wires to the LED and other components.

Q5: True or False: Safety glasses are primarily worn for cosmetic reasons during science projects.
Ans: False
Safety glasses are worn to protect the eyes from potential hazards and are not primarily for cosmetic reasons.

Short Answer Questions

Q1: Explain the significance of reducing costs and promoting recycling in the context of creating a battery-less flashlight.
Ans: Reducing costs by eliminating the need for batteries makes the flashlight more accessible and cost-effective for users. Promoting recycling encourages the reuse of materials, reducing waste and environmental impact. By creating a battery-less flashlight, users can contribute to sustainability and resource conservation.

Q2: What is the main power source in the battery-less flashlight project, and how does it work?
Ans: The main power source in the project is the gear motor. A gear motor combines a DC motor and gears into a single unit. When powered, the motor rotates, and the gears provide mechanical force. This force can be used to generate electricity or mechanical motion for various applications, such as powering an LED in the flashlight.

Q3: Why is it necessary to connect jumper wires to the LED's terminals in the flashlight project?
Ans: Connecting jumper wires to the LED's terminals is necessary to facilitate easy connection to other components in the project, such as the gear motor. It allows for a secure and reliable electrical connection, ensuring that the LED receives power and functions properly.

Q4: How does the metal rod play a role in the battery-less flashlight project?
Ans: The metal rod in the project serves as a handle for the flashlight. It provides a means for users to hold and carry the flashlight comfortably. The handle allows for easy portability and maneuverability of the flashlight.

Q5: Why is it important to wear safety glasses while working on science projects like the battery-less flashlight?
Ans: Safety glasses are important to protect the eyes from potential hazards such as flying debris, hot solder, or chemicals used during the project. They help prevent eye injuries and ensure a safe working environment, making them a crucial safety precaution.