South Sudan Secondary School Education

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Questions and Answers

What is the main reason why sugar molecules do not pass through the semi-permeable shell of an egg when it is placed in a sugar solution?

The size of sugar molecules is larger than the pores of the eggshell (correct)

Sugar molecules are heavier than water molecules

Sugar molecules are more cohesive than water molecules

Sugar molecules are attracted to the eggshell

What is the force of attraction between molecules of the same substance called?

Cohesion (correct)

Osmosis

Adhesion

Diffusion

What is the shape of a drop of water on a waxed surface?

Triangular

Spherical (correct)

Oval

Rectangular

Why does a drop of water spread out on a glass plate?

Due to the force of adhesion between water and glass molecules Signup and view all the answers

What is the term for the movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane?

Osmosis Signup and view all the answers

Why do water molecules move into the egg when it is placed in a sugar solution?

Due to the difference in concentration of water molecules inside and outside the egg Signup and view all the answers

What happens to the shape of a large drop of water on a surface?

It spreads out due to its heaviness Signup and view all the answers

What is the reason for the difference in shape of a drop of water on a glass plate and a waxed surface?

The force of adhesion between water and glass molecules is stronger than between water and wax molecules Signup and view all the answers

What is the purpose of making a mark on the blank strip of the force meter in step 2?

To create a 0 mark on the force meter scale Signup and view all the answers

What happens to the force pulling the spring of the force meter when another 100 g mass is added?

It becomes approximately 2 newtons Signup and view all the answers

Why is it necessary to 'calibrate' the force meter?

To create a scale for taking measurements Signup and view all the answers

What is the purpose of Activity 2.6?

To determine one's own strength Signup and view all the answers

What type of material is commonly used in force meters?

Elastic materials Signup and view all the answers

What is the device used to measure the magnitude of a force?

Force meter Signup and view all the answers

What happens to the force acting on the unknown mass when it is hung from the force meter?

It remains the same Signup and view all the answers

Why do we need to record the reading on the spring balance in Activity 2.6?

To record the force exerted by the partner Signup and view all the answers

What is the primary function of the books developed by the Ministry of General Education and Instruction in South Sudan?

To equip students with skills for the modern global society. Signup and view all the answers

Which of the following is NOT a recommended way to take care of your books?

Use a thick pen as a bookmark. Signup and view all the answers

What should you do if your book gets damaged?

Repair it as quickly as possible. Signup and view all the answers

What consequence is mentioned regarding the selling of the books?

The seller will be prosecuted. Signup and view all the answers

Which action is recommended regarding the usage of bookmarks?

Use a book marker and avoid folding pages. Signup and view all the answers

What action should you take if you lose your book?

Report it immediately to your teacher. Signup and view all the answers

What is advised against when it comes to the condition of the book cover?

Do not write on the cover. Signup and view all the answers

What is the nature of the books published by the Ministry of General Education and Instruction?

Not for sale and property of the Ministry. Signup and view all the answers

What do electric circuits use to control the flow of current?

Resistance Signup and view all the answers

Which type of material allows electric charges to flow freely?

Conductors Signup and view all the answers

Which of the following accurately describes potential difference (p.d)?

The energy per unit charge available to move charges through a circuit Signup and view all the answers

What happens to electric current when the resistance in the circuit increases?

It decreases Signup and view all the answers

What is the primary function of a chemical cell in an electric circuit?

To convert chemical energy into electrical energy Signup and view all the answers

Which statement is true regarding electrostatic charges?

Like charges repel, and unlike charges attract Signup and view all the answers

An electric circuit is considered complete when which condition is met?

Current can flow uninterrupted from the source to the load Signup and view all the answers

Which device is used to measure electric current in a circuit?

Ammeter Signup and view all the answers

What defines matter in scientific terms?

Anything that occupies space and has mass Signup and view all the answers

Which of the following is NOT one of the three states of matter?

Plasma Signup and view all the answers

Which property is associated with solids?

Definite shape and volume Signup and view all the answers

What interaction is important for understanding the different states of matter?

The forces between particles Signup and view all the answers

Which application best describes the physical properties of liquids?

They take the shape of their container but have a fixed volume. Signup and view all the answers

Which process would you investigate to understand surface tension?

Conducting an experiment with a drop of water on a coin Signup and view all the answers

What is the significance of particle theory in understanding matter?

It describes how energy can alter the state of matter. Signup and view all the answers

What causes the change of states of matter?

Changes in temperature and pressure Signup and view all the answers

Study Notes

About the Book

Developed by the Ministry of General Education and Instruction, Republic of South Sudan
Designed to meet the secondary school syllabus and equip students with skills for the modern global society
Property of the Ministry of General Education and Instruction, not for sale

How to Take Care of Your Books

Do's:
- Cover with plastic or paper
- Keep hands clean before using
- Use a book marker, don't fold pages
- Repair damaged books quickly
- Be careful who you lend to
- Keep in a dry place
- Report lost books immediately
Don'ts:
- Write on covers or inside pages
- Cut out pictures
- Tear out pages
- Leave open and face down
- Use pens, pencils, or thick objects as bookmarks
- Force into a full schoolbag
- Use as an umbrella or seat

Physics Student's Book 1

Unit 1: States of Matter

Topics:
- States of matter
- Surface tension, osmosis, and capillarity
Learning outcomes:
- Understand that matter can exist in different states
- Perform tests to investigate surface tension, osmosis, and capillarity
- Predict based on the particle theory
- Use appropriate measures and interpret results
- Report findings
Attitudes:
- Show curiosity in carrying out experiments

Topic 1: States of Matter

Definition of matter: anything that occupies space and has mass
Matter can be classified into three states: solids, liquids, and gases
Composition of matter: made up of small particles called molecules
Physical properties of solids, liquids, and gases
Applications of physical properties of matter

Activity 1.1: To Describe Matter

Discuss and compare examples of matter with a partner
Osmosis: water molecules pass through a semi-permeable shell into an egg in a sugar solution

Cohesive and Adhesive Forces

Force of attraction between molecules of the same substance: cohesive force
Force of attraction between molecules of different substances: adhesive force
Examples:
- A free liquid drop is almost spherical
- A drop of water on a glass plate spreads out due to adhesion
- A drop of water on a waxed surface remains spherical due to weaker adhesion

Activity 2.6: To Determine Your Own Strength

Measure force using a spring balance
Record and compare readings with a partner
Determine the difference between your strengths

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Description

This quiz is based on the secondary school series developed by the Ministry of General Education and Instruction, Republic of South Sudan. It covers the skills and knowledge needed to fit in the modern global society.