Class IV: Science & Tech
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Questions and Answers

What is the primary aim of the book?

  • To focus on mathematical skills only
  • To provide stories and narratives
  • To teach history and geography
  • To develop competencies in investigations and curiosity (correct)

    • The book is geared towards developing literacy skills in reading, writing, and arithmetic.

    True

    How many chapters are included in the book?

    Eleven

    The chapter on ______ focuses on environmental safety and activities that threaten the safety of the environment.

    <p>Environment</p> Signup and view all the answers

    Match the following chapters with their primary focus:

    <p>Environment = Environmental safety Diseases = Health-related issues Water = Importance and conservation First aid = Emergency response techniques</p> Signup and view all the answers

    Which chapter is NOT included in the book?

    <p>Transportation</p> Signup and view all the answers

    The book supports learning primarily through theoretical explanations.

    <p>False</p> Signup and view all the answers

    What skills aside from scientific and technological skills does the book aim to develop?

    <p>Creativity</p> Signup and view all the answers

    Which of the following best describes a safe environment for living things?

    <p>An environment with clean soil, air, and water.</p> Signup and view all the answers

    A polluted environment can promote the health and growth of living things.

    <p>False</p> Signup and view all the answers

    Name one example of a living thing.

    <p>Animals</p> Signup and view all the answers

    The non-living things in the environment include sand, stones, air, and _____ .

    <p>water</p> Signup and view all the answers

    Match the following types of pollution with their descriptions:

    <p>Soil pollution = Contamination of land surfaces Air pollution = Presence of harmful substances in the atmosphere Water pollution = Degradation of water bodies Noise pollution = Excessive or harmful levels of noise</p> Signup and view all the answers

    What is the consequence of a polluted environment for living things?

    <p>It affects their health and growth.</p> Signup and view all the answers

    Living things include only animals.

    <p>False</p> Signup and view all the answers

    What are two essential components of a safe environment?

    <p>Clean air and clean water</p> Signup and view all the answers

    Clean _____ is essential for the health of living things.

    <p>soil</p> Signup and view all the answers

    Which of these actions can help prevent environmental pollution?

    <p>Recycling materials.</p> Signup and view all the answers

    Which of the following is NOT mentioned as a use of electricity?

    <p>Planting crops</p> Signup and view all the answers

    Rehema explained that electricity is harmful in any situation.

    <p>False</p> Signup and view all the answers

    What are two benefits of electricity mentioned by Rehema?

    <p>Electric cookers for cooking and refrigerators for preserving foods.</p> Signup and view all the answers

    One of the dangers of electricity is _______.

    <p>fires</p> Signup and view all the answers

    Match the following appliances with their respective uses:

    <p>Electric cooker = Cooking food Refrigerator = Preserving food Blender = Making juice Water pump = Pumping water</p> Signup and view all the answers

    What was the primary source of electricity installed in Rehema’s village?

    <p>Solar energy</p> Signup and view all the answers

    Electricity can help create jobs in various industries.

    <p>True</p> Signup and view all the answers

    Name one machine that uses electricity for industrial purposes.

    <p>Welding machine.</p> Signup and view all the answers

    Careless use of electricity can result in _______.

    <p>explosions</p> Signup and view all the answers

    Which of the following is a reason for thanking Rehema?

    <p>Her information on the uses and dangers of electricity</p> Signup and view all the answers

    What can inappropriate connections of electricity cause?

    <p>Fires and damage.</p> Signup and view all the answers

    Which food items are typically kept in the freezer compartment of a refrigerator?

    <p>Meat, fish, and milk</p> Signup and view all the answers

    The temperature in the fridge compartment is always above 5 degrees centigrade.

    <p>False</p> Signup and view all the answers

    What is the main purpose of the freezer compartment in a refrigerator?

    <p>To store food that needs to be preserved for a longer time.</p> Signup and view all the answers

    The part of the refrigerator that keeps foods cold but does not freeze them is called the __________.

    <p>fridge</p> Signup and view all the answers

    Match the following functions with their corresponding parts of the refrigerator:

    <p>Freezer = Preserves food for long-term storage Fridge = Keeps food cold to prevent spoilage</p> Signup and view all the answers

    What is the primary function of a refrigerator?

    <p>To cool and preserve food</p> Signup and view all the answers

    Refrigerators are not used in hospitals to store medicines.

    <p>False</p> Signup and view all the answers

    Why are refrigerators more important in hot climates?

    <p>To keep food fresh and prevent spoilage due to high temperatures.</p> Signup and view all the answers

    A refrigerator uses __________ to operate.

    <p>electricity</p> Signup and view all the answers

    Match the following purposes with their corresponding items:

    <p>Refrigerator = Preserves food Stove = Cooks food Freezer = Stores frozen items Microwave = Heats food quickly</p> Signup and view all the answers

    What is one advantage of using a refrigerator?

    <p>Keeps food fresh for a longer time</p> Signup and view all the answers

    Medicines do not require cool storage.

    <p>False</p> Signup and view all the answers

    What type of energy do refrigerators primarily use?

    <p>Electrical energy</p> Signup and view all the answers

    Refrigerators are important in __________ climate areas to ensure food preservation.

    <p>hot</p> Signup and view all the answers

    What role do refrigerators play in soft drink sales?

    <p>They preserve the taste of soft drinks</p> Signup and view all the answers

    Refrigerators can help save time by reducing the need for frequent shopping.

    <p>True</p> Signup and view all the answers

    What is the primary function of a refrigerator?

    <p>To keep food cold</p> Signup and view all the answers

    Refrigerators are primarily used to cook food.

    <p>False</p> Signup and view all the answers

    Name one advantage of using a refrigerator.

    <p>Food preservation</p> Signup and view all the answers

    The part of the refrigerator that keeps foods frozen is called the __________.

    <p>freezer</p> Signup and view all the answers

    Match the following parts of a refrigerator with their functions:

    <p>Compressor = Circulates refrigerant Condenser = Releases heat Evaporator = Absorbs heat Thermostat = Regulates temperature</p> Signup and view all the answers

    Which type of energy do refrigerators primarily use?

    <p>Electrical energy</p> Signup and view all the answers

    In hot climates, refrigerators are less important for food preservation.

    <p>False</p> Signup and view all the answers

    What is one typical use of a refrigerator in a household?

    <p>Storing perishable food items</p> Signup and view all the answers

    What is the primary function of a wind turbine?

    <p>To convert wind energy into electricity</p> Signup and view all the answers

    Wind farms are constructed to collect solar energy.

    <p>False</p> Signup and view all the answers

    Name one location in Tanzania that is suitable for constructing a wind farm.

    <p>Singida or Makambako</p> Signup and view all the answers

    Electricity is generated when strong wind blows on the blades which rotates turbines connected to an __________.

    <p>electric generator</p> Signup and view all the answers

    Match the following components with their functions:

    <p>Blades = Rotate in strong wind Wind turbine = Converts wind energy to mechanical energy Electric generator = Converts mechanical energy to electricity Wind farm = Location with multiple wind turbines</p> Signup and view all the answers

    What force primarily drives electricity generation in wind turbines?

    <p>Wind</p> Signup and view all the answers

    Wind farms can be constructed in any area regardless of wind conditions.

    <p>False</p> Signup and view all the answers

    What is the common term for a large area with many wind turbines?

    <p>Wind farm</p> Signup and view all the answers

    A place where wind electricity is generated by many wind turbines is called a __________.

    <p>wind farm</p> Signup and view all the answers

    Which component of a wind turbine measures the wind's force and aids rotation?

    <p>Blades</p> Signup and view all the answers

    What does the term 'reflection' refer to in the context of light?

    <p>The bouncing or change of direction of light by a smooth shining surface</p> Signup and view all the answers

    A solar panel converts sunlight energy into electricity.

    <p>True</p> Signup and view all the answers

    What term describes an object that permits light rays to pass through it?

    <p>transparent</p> Signup and view all the answers

    What is included in the definition of environment?

    <p>Both living and non-living things</p> Signup and view all the answers

    An _____ is a negatively charged particle.

    <p>electron</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Opaque = Does not allow light to pass through Media = Materials through which light travels Image = Picture or shape that appears in smooth shining surfaces Fault = Not working properly or damaged</p> Signup and view all the answers

    A polluted environment allows living things to thrive.

    <p>False</p> Signup and view all the answers

    What components make an environment safe for living things?

    <p>Clean soil, air, and water</p> Signup and view all the answers

    If the environment is _____, it becomes unsafe for living things.

    <p>polluted</p> Signup and view all the answers

    Match the following types of pollution with their effects:

    <p>Water pollution = Affects aquatic life Air pollution = Causes respiratory issues Soil pollution = Harms plant growth Noise pollution = Affects animal behavior</p> Signup and view all the answers

    Which activity is likely to threaten the safety of the environment?

    <p>Dumping waste in rivers</p> Signup and view all the answers

    Living things exclusively involve animals.

    <p>False</p> Signup and view all the answers

    Name one way to prevent environmental pollution.

    <p>Recycling materials</p> Signup and view all the answers

    The non-living components of the environment include sand, stones, air, and _____.

    <p>water</p> Signup and view all the answers

    What characterizes a safe environment for living things?

    <p>Clean soil, air, and water</p> Signup and view all the answers

    What is the primary energy conversion taking place in a torch bulb?

    <p>Electrical energy to light energy</p> Signup and view all the answers

    The flow of electric current is necessary for the bulb to light up.

    <p>True</p> Signup and view all the answers

    What happens when the bulb is detached from the positive part of the battery?

    <p>The bulb stops giving light.</p> Signup and view all the answers

    Light can be produced by __________ sources like the sun.

    <p>natural</p> Signup and view all the answers

    Match the following objects with their light behavior:

    <p>Translucent = Allows some light to pass through Opaque = Blocks light completely Transparent = Allows light to pass through completely Reflective = Bounces light off its surface</p> Signup and view all the answers

    What component must be properly connected for the electric current to flow?

    <p>The bulb and dry cells</p> Signup and view all the answers

    Light can pass through all objects without any restrictions.

    <p>False</p> Signup and view all the answers

    What causes electric charges to flow in the circuit?

    <p>The connection of dry cells, wires, and the bulb.</p> Signup and view all the answers

    When the circuit is complete, the bulb gives out __________ and heat energy.

    <p>light</p> Signup and view all the answers

    Which of the following describes light's behavior when it encounters different objects?

    <p>It can be blocked or pass through</p> Signup and view all the answers

    Who served as the designer for the textbook?

    <p>Mr. Kuyonza Kini Kuyonza</p> Signup and view all the answers

    The textbook is the first book in a series of five for Science and Technology.

    <p>False</p> Signup and view all the answers

    Who is the Director General of the Tanzania Institute of Education?

    <p>Dr. Aneth A. Komba</p> Signup and view all the answers

    The Institute expresses gratitude to primary school teachers and pupils who participated in the __________ phase of the manuscript.

    <p>trial</p> Signup and view all the answers

    Match the contributors with their roles:

    <p>Dr. Felista Urasa = Writer Prof. Stelyus Mkoma = Editor Mr. Kuyonza Kini Kuyonza = Designer Alama Art and Media Production Co.Ltd. = Illustrator</p> Signup and view all the answers

    Which committee is mentioned for coordinating the development of the textbook?

    <p>Coordinators Committee</p> Signup and view all the answers

    The Ministry of Education, Science, and Technology was acknowledged for their role in facilitating the writing of the textbook.

    <p>True</p> Signup and view all the answers

    In which year was the textbook published?

    <p>2019</p> Signup and view all the answers

    What is one source of electricity generation?

    <p>Hydro-electricity</p> Signup and view all the answers

    Solar panels are used to convert sunlight into electricity.

    <p>True</p> Signup and view all the answers

    Name one type of energy discussed in the chapter.

    <p>Electrical energy</p> Signup and view all the answers

    Electricity generated using waterfalls is known as __________.

    <p>hydro-electricity</p> Signup and view all the answers

    Match the following energy sources with their respective types of energy:

    <p>Wind = Renewable energy Fossil fuels = Non-renewable energy Sunlight = Renewable energy Waterfalls = Renewable energy</p> Signup and view all the answers

    What should be done to reduce the use of firewood and charcoal as fuel?

    <p>Promote renewable energy sources</p> Signup and view all the answers

    Light energy is not discussed in this chapter.

    <p>False</p> Signup and view all the answers

    List one type of waste material that can be recycled.

    <p>Plastic</p> Signup and view all the answers

    The process of using waste material to form new products is called __________.

    <p>recycling</p> Signup and view all the answers

    Which of the following is NOT an energy conversion system?

    <p>Incinerators</p> Signup and view all the answers

    What is the term for the bouncing or change of direction of light by a smooth shining surface?

    <p>Reflection</p> Signup and view all the answers

    A transparent object allows light rays to pass through it.

    <p>True</p> Signup and view all the answers

    What is an electron?

    <p>A negatively charged particle.</p> Signup and view all the answers

    A device that converts sunlight energy to electricity is called a _________.

    <p>solar panel</p> Signup and view all the answers

    Match the following vocabulary terms with their definitions:

    <p>Image = Picture or shape appearing in smooth shining surfaces Media = Substances or materials light travels through Fault = Not working correctly or damaged Transparent = Object that permits light to pass through</p> Signup and view all the answers

    Which of the following is a common use of electricity in households?

    <p>Heating water</p> Signup and view all the answers

    Electricity is only used for lighting in homes.

    <p>False</p> Signup and view all the answers

    Name one electric appliance commonly found in households.

    <p>Refrigerator</p> Signup and view all the answers

    The primary function of a refrigerator is to keep food __________.

    <p>cold</p> Signup and view all the answers

    Match the following electric appliances with their uses:

    <p>Oven = Cooking food Toaster = Toasting bread Vacuum cleaner = Cleaning surfaces Washing machine = Cleaning clothes</p> Signup and view all the answers

    What type of energy do refrigerators primarily use?

    <p>Electrical energy</p> Signup and view all the answers

    A refrigerator can function without electricity.

    <p>False</p> Signup and view all the answers

    What is one advantage of using a refrigerator?

    <p>Preserves food freshness</p> Signup and view all the answers

    The main purpose of the freezer compartment in a refrigerator is to __________ food.

    <p>freeze</p> Signup and view all the answers

    Why are refrigerators particularly important in hot climates?

    <p>They keep food from spoiling.</p> Signup and view all the answers

    What is the purpose of the power grid?

    <p>To transmit electricity on a national scale</p> Signup and view all the answers

    An electric circuit only functions when the switch is turned off.

    <p>False</p> Signup and view all the answers

    What is required for electricity to flow in a circuit?

    <p>The circuit must be properly connected and the switch turned on.</p> Signup and view all the answers

    An electric circuit consists of the source of electricity, ____, connecting wires or cables, switches, and electrical appliances.

    <p>dry cells</p> Signup and view all the answers

    Match the components of a circuit with their roles:

    <p>Dry Cells = Source of electricity Switch = Controls current flow Connecting Wires = Pathway for current Light Bulb = Electrical appliance that emits light</p> Signup and view all the answers

    Which of the following materials is NOT used in the experiment to show that dry cells produce electricity?

    <p>Transistor</p> Signup and view all the answers

    Removing dry cells from a connected circuit allows electricity to flow.

    <p>False</p> Signup and view all the answers

    To complete the circuit, connect the other end of the second wire to the middle metallic part of the _____.

    <p>bulb</p> Signup and view all the answers

    List one component that must be turned on for the circuit to function.

    <p>Switch</p> Signup and view all the answers

    Match the step of the procedure with its description:

    <p>Step 1 = Connect the dry cells as shown Step 2 = Connect wire to positive terminal and switch Step 3 = Connect wire to bulb from switch Step 4 = Connect wire from bulb to negative terminal</p> Signup and view all the answers

    What is the maximum number of digits that students will learn to add in this chapter?

    <p>Five digits</p> Signup and view all the answers

    Mary bought more chicks in two months than Juma harvested mangoes and avocados combined.

    <p>True</p> Signup and view all the answers

    What is the result of adding 9,645 and 312?

    <p>9,957</p> Signup and view all the answers

    Juma harvested a total of ____ mangoes and avocados combined.

    <p>4,621</p> Signup and view all the answers

    Match the following addition problems with their results:

    <p>9,327 + 432 = 9,759 8,195 + 1,502 = 9,697 5,362 + 235 = 5,597 6,845 + 3,101 = 9,946</p> Signup and view all the answers

    Which of the following addition results is correct?

    <p>4,798 + 2,455 = 7,253</p> Signup and view all the answers

    The knowledge of adding numbers up to five digits can be useful in everyday activities.

    <p>True</p> Signup and view all the answers

    What is the sum of 4,486 and 4,398?

    <p>8,884</p> Signup and view all the answers

    What is the value in the ten thousands place when adding 13,827 and 15,685?

    <p>9</p> Signup and view all the answers

    In the addition of 13,827 and 15,685, the digit written in the ones place after regrouping is 5.

    <p>False</p> Signup and view all the answers

    What is the final sum when adding 13,827 and 15,685?

    <p>29,512</p> Signup and view all the answers

    After regrouping, the number in the hundreds position becomes __________.

    <p>5</p> Signup and view all the answers

    Match the step with the corresponding addition result:

    <p>Add ones = 2 Add tens = 1 Add hundreds = 5 Add thousands = 9</p> Signup and view all the answers

    How many groups of ten are there when regrouping 12 ones?

    <p>1</p> Signup and view all the answers

    1 group of ten thousands is added to the ten thousands place when performing the addition.

    <p>True</p> Signup and view all the answers

    In the vertical addition of 13,827 and 15,685, how is the digit placed in the tens position derived?

    <p>1 is written in the tens position after regrouping 11 tens.</p> Signup and view all the answers

    After completing the addition, the final answer is __________.

    <p>29,512</p> Signup and view all the answers

    Match the following places with their respective values:

    <p>Ones place = 2 Tens place = 1 Hundreds place = 5 Thousands place = 9</p> Signup and view all the answers

    What is the result of adding $58,271 + 32,989$?

    <p>91,260</p> Signup and view all the answers

    The sum of $58,271 + 32,989$ can be achieved without regrouping.

    <p>False</p> Signup and view all the answers

    What is the first step in the addition of $58,271 + 32,989$?

    <p>Add the ones column.</p> Signup and view all the answers

    In adding, if a column sum exceeds 10, you must __________.

    <p>regroup</p> Signup and view all the answers

    Match the following steps with their respective operations in the addition process:

    <p>Add ones = Regroup if sum is 10 or more Add tens = Carry over to hundreds if sum is 10 or more Add hundreds = Carry over to thousands if sum is 10 or more Add thousands = Final sum after regrouping</p> Signup and view all the answers

    What is the correct regrouping process when adding the tens in $58,271 + 32,989$?

    <p>1 + 7 + 8 = 16</p> Signup and view all the answers

    In the addition of numbers, every column must be added in the same order as written.

    <p>True</p> Signup and view all the answers

    What is the maximum sum that can be achieved from the numbers presented?

    <p>99,999</p> Signup and view all the answers

    The sum for $58,271 + 32,989$ leads to a total of __________.

    <p>91,260</p> Signup and view all the answers

    When adding hundreds, what is the sum of $1 + 2 + 9$?

    <p>12</p> Signup and view all the answers

    What is the total of 53 415 and 21 045?

    <p>74 460</p> Signup and view all the answers

    The national park in Tanzania has more zebras than buffaloes.

    <p>True</p> Signup and view all the answers

    Calculate 66 612 + 24 588.

    <p>91 200</p> Signup and view all the answers

    The total number of zebras and buffaloes in the national park is ______.

    <p>80 019</p> Signup and view all the answers

    Match the following addition problems with their answers:

    <p>53 656 + 6 667 = 60 323 48 434 + 23 537 = 72 061 77 999 + 10 001 = 88 000 39 892 + 10 108 = 50 000</p> Signup and view all the answers

    What is the result of adding 2,636 and 8,345?

    <p>11,681</p> Signup and view all the answers

    The sum of 47,345 and 17,092 is 64,637.

    <p>False</p> Signup and view all the answers

    What is the thousands place in the number 60,606?

    <p>60</p> Signup and view all the answers

    The sum of 36,328 and 60,606 is __________.

    <p>96,934</p> Signup and view all the answers

    Match the following sums with their results:

    <p>2,636 + 8,345 = 10,981 47,345 + 17,092 = 64,437 36,328 + 60,606 = 96,934 64,646 + 5,371 = 69,017</p> Signup and view all the answers

    Which number is the result of 16,661 plus 61,836?

    <p>78,497</p> Signup and view all the answers

    The answer to 29,327 plus 10,191 is 39,518.

    <p>True</p> Signup and view all the answers

    If you add 24,042 and 38,977, what is the result?

    <p>62,019</p> Signup and view all the answers

    The combined total of 40,976 and __________ is 51,509.

    <p>10,533</p> Signup and view all the answers

    What is the result of adding 15,051 and 8,269?

    <p>23,320</p> Signup and view all the answers

    What is the highest number of digits that will be covered in this chapter's addition problems?

    <p>Five digits</p> Signup and view all the answers

    Mary bought a total of 8,222 chicks in May and June 2018.

    <p>False</p> Signup and view all the answers

    What is the result of adding 36,328 and 60,606?

    <p>96,834</p> Signup and view all the answers

    How many chicks did Mary buy in total over the two months?

    <p>8,222</p> Signup and view all the answers

    The total of 38,373 and 66,997 is 105,370.

    <p>True</p> Signup and view all the answers

    What is the sum of 24,042 and 38,977?

    <p>62,019</p> Signup and view all the answers

    The process of adding numbers helps in _______ and selling goods.

    <p>buying</p> Signup and view all the answers

    Match the following addition problems with their answers:

    <p>9,327 + 432 = 9,759 5,362 + 235 = 5,597 845 + 5,101 = 5,946 4,798 + 2,455 = 7,253</p> Signup and view all the answers

    The result of adding 15,051 and 85,585 is _____ .

    <p>100,636</p> Signup and view all the answers

    Match the numbers with their corresponding addition problems:

    <p>2,636 = 2,636 + 8,345 47,345 = 47,345 + 17,092 36,328 = 36,328 + 60,606 64,646 = 64,646 + 5,371</p> Signup and view all the answers

    Which addition problem equals 9,735?

    <p>9,735 + 235</p> Signup and view all the answers

    Which of the following sums is equal to 52,534?

    <p>45,745 + 6,789</p> Signup and view all the answers

    The chapter discusses solving addition problems up to three digits.

    <p>False</p> Signup and view all the answers

    What is one application of addition mentioned in the content?

    <p>Data collection</p> Signup and view all the answers

    The sum of 40,976 and 48,180 is less than 90,000.

    <p>False</p> Signup and view all the answers

    What is the result of adding 10,191 to 29,327?

    <p>39,518</p> Signup and view all the answers

    When you add 61,836 to 16,661, the total is _____ .

    <p>78,497</p> Signup and view all the answers

    Match the results with their correct addition sentences:

    <p>48,488 = 48,488 + 10,191 16,615 = 16,615 + 66,997 75,755 = 75,755 + 15,575 40,976 = 40,976 + 17,345</p> Signup and view all the answers

    How much money did Kombe give his daughter in total for both terms?

    <p>95,500 shillings</p> Signup and view all the answers

    The total amount of water used by Mwajuma's family over two years is 12,204 liters.

    <p>True</p> Signup and view all the answers

    How many patients did the doctor attend to on both Monday and Tuesday?

    <p>141</p> Signup and view all the answers

    The combined number of cars inspected in two regions is __________.

    <p>19,566</p> Signup and view all the answers

    Match the following wards with the number of pupils enrolled:

    <p>Twendepamoja ward = 1,050 Mwembetogwa ward = 889</p> Signup and view all the answers

    What is the sum of 53,415 and 21,045?

    <p>74,460</p> Signup and view all the answers

    The total number of zebras and buffaloes in the park is 80,919.

    <p>True</p> Signup and view all the answers

    What is the result of 66,612 + 24,588?

    <p>91,200</p> Signup and view all the answers

    The sum of 48,434 and 23,537 is __________.

    <p>71,971</p> Signup and view all the answers

    Match the following pairs of numbers with their sums:

    <p>43,892 = 8,329 77,999 = 10,001 59,816 = 32,275 67,456 = 11,553</p> Signup and view all the answers

    66,478 + 24,310 equals 91,788.

    <p>False</p> Signup and view all the answers

    Calculate the result of 64,124 + 16,283.

    <p>80,407</p> Signup and view all the answers

    The addition of 75,520 and 9,221 results in __________.

    <p>84,741</p> Signup and view all the answers

    Match the following problems with their answers:

    <p>53,656 + 6,667 = 60,323 57,336 + 12,217 = 69,553 39,892 + 10,108 = 50,000 81,858 + 12,141 = 93,999</p> Signup and view all the answers

    How many zebras and buffaloes were there in total?

    <p>81,019</p> Signup and view all the answers

    Chunya district has more Mathematics books than Kiswahili books.

    <p>False</p> Signup and view all the answers

    What is the total amount of maize stored by the farmer in 2017 and 2018?

    <p>47,590</p> Signup and view all the answers

    The total number of seedlings planted by the youth group is ______.

    <p>81,262</p> Signup and view all the answers

    Match the following items with their quantities:

    <p>Zebras = 78,696 Buffaloes = 2,323 Mathematics books = 24,751 Kiswahili books = 74,552</p> Signup and view all the answers

    How many litres of milk were sold in January and February?

    <p>63,640</p> Signup and view all the answers

    The farmer sold more litres of milk in February than in January.

    <p>True</p> Signup and view all the answers

    How many total books does Chunya district have?

    <p>99,303</p> Signup and view all the answers

    In 2018, the farmer stored ______ kilograms of maize.

    <p>21,913</p> Signup and view all the answers

    Match the following amounts to the activities:

    <p>Kilograms of maize stored in 2017 = 25,677 Total kilograms of maize stored = 47,590 Total litres of milk sold = 63,640 Kiswahili books total = 74,552</p> Signup and view all the answers

    Study Notes

    Environment

    • Environment includes living things like plants and animals
    • Environment includes non-living things like sand, stones, air and water
    • Safe environment for living things is unpolluted
    • Polluted environments are unsafe for living things
    • Clean soil, air, and water make a safe environment

    Energy & Its Use

    • Refrigerators cool food, preserving food
    • Refrigerators use electricity to operate
    • Refrigerators have two parts, a fridge and a freezer
    • The freezer compartment freezes food
    • The fridge compartment keeps food cold and is used to store food that requires low temperatures

    Electrical Energy

    • Electricity is used in various devices including cookers, refrigerators, blenders, water pumps, and hair clippers
    • Electricity is important in industries, hospitals, factories, workshops, and laboratories
    • Electricity can be dangerous if not used with care
    • Electrical faults can cause fires, explosions, and death
    • Solar energy is a source of electricity and has benefits for communities.

    Environment

    • Environmental pollution is caused by activities that threaten the safety of living things including air, water, and soil pollution.
    • A safe environment is one that has not been polluted and allows living things to thrive.
    • A polluted environment affects the health and growth of living things.

    Generating Electricity using Solar Power

    • Solar panels can generate electricity by converting sunlight energy.
    • Solar panels can be placed on rooftops to generate electricity for homes.

    Generating Electricity using Wind Power

    • Wind turbines generate electricity from the wind.
    • Wind turbines are connected to electric generators.
    • Many wind turbines together form a wind farm.

    Soil Pollution

    • Soil pollution occurs when harmful substances enter the soil.
    • Soil pollution can be caused by industrial waste, agricultural chemicals, and sewage.

    Dry Cells and Electric Current

    • Dry cells are a source of electrical energy.
    • Electric current flows from the dry cells through wires.
    • Electric current can pass through a bulb and cause it to light up.

    Properties of Light

    • Light travels in straight lines.
    • Light is a form of energy.
    • The sun is a natural source of light.
    • Light can be reflected and refracted.
    • Reflection occurs when light bounces off a smooth surface.
    • Refraction occurs when light bends as it passes through different mediums.
    • An image is a picture or shape that appears in a smooth, shining surface.
    • Transparent objects allow light to pass through them.
    • Opaque objects block light.

    Electrical Energy

    • Electricity is generated by waterfalls, sunlight, wind, and fossil fuels.
    • These energy sources are converted into electricity using solar panels, wind turbines, water turbines, dynamos, and fueled generators.
    • Hydroelectricity is electricity generated using waterfalls.
    • The transmission of electricity requires special pathways, including a large national scale pathway called the power grid.
    • Small scale pathways found in homes and science laboratories are called electric circuits.
    • An electric circuit is a path through which electric current flows.
    • It consists of the source of electricity, connecting wires or cables, switches, and electrical appliances or devices.
    • Electricity only flows if the circuit is properly connected and a switch is turned on.
    • Dry cells can be used as a source of electricity in simple circuits, which can be constructed with dry cells, connecting wires, switches, and light bulbs.

    Optics: Properties of Light Energy

    • Optics is the study of the general properties of light energy.
    • Light can travel in straight lines, bend, and reflect.
    • Transparent objects, like glass and water, allow light to pass through them.
    • Opaque objects block light, such as wood and metal.
    • The sun is a natural source of light.
    • Reflection occurs when light bounces off smooth surfaces.
    • Refraction occurs when the direction of light changes as it passes from one medium to another.
    • Images are formed by reflection or refraction.

    National Park Animals

    • A national park in Tanzania has 78,696 zebras
    • There are 2,323 buffaloes in the park
    • The total number of zebras and buffaloes in the park is 78,696 + 2,323

    Adding Numbers

    • This chapter focuses on adding numbers up to five digits.
    • Knowledge of adding larger numbers is useful in daily life, including shopping, data analysis, and solving problems.

    Adding Numbers with Regrouping

    • When adding numbers with multiple digits, it's important to regroup when the sum of a column exceeds 9.
    • For example, when adding 31,072 + 29,853, you regroup the units column (2+3=5).
    • You then regroup the tens column (7+5=12), writing down 2 and carrying the 1 to the hundreds column.
    • You continue this process, regrouping into thousands and ten thousands places if necessary, to get the final sum: 60,925.

    Word Problems Involving Addition

    • To solve word problems with addition, first identify the necessary information: the numbers being added and what they represent.
    • Then, add the numbers together to get the total value.
    • For example, if a farmer stored 25,677 kilograms of maize in 2017 and 21,913 kilograms in 2018, to find the total amount stored, you would add these two numbers together: 25,677 + 21,913 = 47,590 kilograms of maize.

    Summary of Addition

    • To add numbers, align them horizontally or vertically.
    • Add the digits in each column, starting from the rightmost column and moving left.
    • Remember to regroup (carry over) when the sum of a column exceeds 9.

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    Related Documents

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    Description

    This quiz covers essential concepts about the environment, energy usage, and electrical energy's importance. It emphasizes the relationship between pollution and safety for living beings, along with the functions of electrical appliances like refrigerators. Test your understanding of these fundamental topics crucial for 10th-grade science.

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