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

Fill in the Blanks

Q1: The term "JCB" stands for ________________.
Ans: The term "JCB" stands for Joseph Cyril Bamford.
The abbreviation "JCB" refers to the initials of Joseph Cyril Bamford, the founder of the company specializing in manufacturing construction and agricultural machines.

Q2: Hydraulic excavators operate using ________________ as the main component.
Ans: Hydraulic excavators operate using liquid fluids as the main component.
Hydraulic systems utilize liquid fluids, like oil or hydraulic fluid, to transmit force and operate machinery effectively.

Q3: Pascal's law states that when pressure is applied to a fluid inside a closed container, the force is transmitted to the liquid and the container's ________________.
Ans: Pascal's law states that when pressure is applied to a fluid inside a closed container, the force is transmitted to the liquid and the container's walls.
Pascal's law describes the fundamental principle of hydraulic systems, where pressure applied to a confined fluid is transmitted equally in all directions, including the walls of the container.

Q4: In the Hydraulic JCB project, the 20 ml syringe is responsible for moving the ________________ part up and down.
Ans: In the Hydraulic JCB project, the 20 ml syringe is responsible for moving the boom part up and down.
The 20 ml syringe in the Hydraulic JCB model controls the movement of the boom, allowing it to move up and down.

Q5: Hydraulic JCBs make work easier and more efficient in various ________________ scenarios.
Ans: Hydraulic JCBs make work easier and more efficient in various construction scenarios.
Hydraulic JCBs, being construction machinery, significantly improve efficiency and ease of work on construction sites.

Multiple Choice Questions (MCQ)

Q1: What does the term "JCB" stand for?
(a) Just Construction Basics
(b) Joseph Cyril Bamford
(c) Joint Crane Builders
(d) Jackhammer Control Box
Ans: (b) Joseph Cyril Bamford
"JCB" stands for Joseph Cyril Bamford, the company that specializes in manufacturing construction and agricultural machines.

Q2: What is the main component used in hydraulic systems?
(a) Air
(b) Water
(c) Liquid Fluids
(d) Gasoline
Ans: (c) Liquid Fluids
Hydraulic systems operate using liquid fluids as the main component.

Q3: Which of the following is NOT a type of pressure?
(a) Absolute pressure
(b) Gauge pressure
(c) Atmospheric pressure
(d) Velocity pressure
Ans: (d) Velocity pressure
Velocity pressure is not a type of pressure. The correct types of pressure are absolute pressure, gauge pressure, and atmospheric pressure.

Q4: What is the formula for calculating pressure?
(a) P = F/A
(b) P = A/F
(c) P = F + A
(d) P = F x A
Ans: (a) P = F/A
The formula for calculating pressure is P = F/A, where P is pressure, F is force, and A is the are(a)

Q5: What is the function of the 10 ml syringe in the Hydraulic JCB project?
(a) To move the boom part up and down
(b) To move the bucket forward and backward
(c) To control the hydraulic fluid flow
(d) To measure pressure
Ans: (b) To move the bucket forward and backward
The 10 ml syringe in the Hydraulic JCB project is used to move the bucket forward and backward.

True or False

Q1: Pascal's law states that when pressure is applied to a fluid inside a closed container, the force is not transmitted to the liquid.
Ans: False
Pascal's law states that when pressure is applied to a fluid inside a closed container, the force is transmitted to the liquid and the container's walls.

Q2: Hydraulic excavators are commonly used in agriculture but not in construction.
Ans: False
Hydraulic excavators are commonly used in construction, not just in agriculture.

Q3: The 20 ml syringe in the Hydraulic JCB project is responsible for moving the bucket forward and backward.
Ans: False
The 10 ml syringe in the Hydraulic JCB project is responsible for moving the bucket forward and backward.

Q4: The Hydraulic JCB project is an excellent way to learn about important scientific concepts like pressure and hydraulics.
Ans: True
The Hydraulic JCB project is indeed an excellent way to learn about important scientific concepts like pressure and hydraulics.

Q5: Hydraulic systems in vehicles are primarily used for steering control.

Ans: False
Hydraulic systems in vehicles are primarily used for various functions, including steering control.

Short Answer Questions

Q1: Explain the concept of pressure and provide its formula.
Ans: Pressure is the ratio of force applied perpendicularly to the unit area. The formula for pressure is P = F/A, where P is pressure, F is force, and A is the area.

Q2: What is the significance of Pascal's law in hydraulic systems?
Ans: Pascal's law is significant in hydraulic systems because it states that when pressure is applied to a fluid inside a closed container, that force is transmitted to the liquid and the container's walls. This principle forms the basis for the operation of hydraulic machines.

Q3: Describe the main components of the Hydraulic JCB project.
Ans: The main components of the Hydraulic JCB project include wooden blocks of various lengths, nuts, bolts, syringes of different capacities, medical tubes, a base material (such as plywood), and additional materials like hot melting glue and a DIY knife.

Q4: How does the 10 ml syringe contribute to the operation of the Hydraulic JCB model?
Ans: The 10 ml syringe in the Hydraulic JCB project is used to move the bucket forward and backward. By controlling
the flow of hydraulic fluid, it controls the movement of the bucket.

Q5: What are the advantages of conducting the Hydraulic JCB project as a science experiment?
Ans: The advantages of conducting the Hydraulic JCB project as a science experiment include gaining hands-on knowledge about hydraulic systems, understanding scientific concepts like force, pressure, and hydraulics, engaging students in science, motivating them to explore further, and potentially serving as a captivating science fair idea.

Q6: Why is safety important when working on science projects like the Hydraulic JCB?
Ans: Safety is important when working on science projects like the Hydraulic JCB to prevent accidents and injuries. Wearing safety glasses protects the eyes, handling the DIY knife with care prevents injuries, and supervision by parents, teachers, or older siblings ensures safe practices.

Q7: Name one practical application of hydraulic systems other than in construction machinery.
Ans: One practical application of hydraulic systems, other than in construction machinery, is in vehicle brakes. Hydraulic brake systems use fluid pressure to transmit force to the brake pads, allowing for efficient braking.

Q8: How does the Hydraulic JCB project promote student engagement and motivation in science?
Ans: The Hydraulic JCB project promotes student engagement and motivation in science by providing a hands-on and interactive learning experience. It encourages active participation in science workshops and sparks curiosity.

Q9: What is the purpose of wearing safety glasses during the project?
Ans: Wearing safety glasses during the project is essential to protect the eyes from potential hazards such as flying wood splinters or debris when working with tools and materials.

Q10: How does the Hydraulic JCB project demonstrate the principles of hydraulics and pressure?
Ans: The Hydraulic JCB project simulates a hydraulic system, demonstrating how pressure and hydraulic fluid control the movement of the boom and bucket, illustrating the principles of hydraulics and pressure.