M16 SAINS HABA T5

Apakah maksud haba? (What is the meaning of heat?)

• Suatu bentuk tenaga yang dipindahkan daripada panas kepada sejuk (A form of energy transferred from hot to cold)

• Darjah kepanasan atau kesejukan sesuatu objek. (The degree of hotness or coldness of an object.)

• Bahan yang diukur menggunakan termometer. (A substance that is measured using a thermometer.)

• Unit piawai bagi suhu dalam Sistem Antarabangsa. (The standard unit for temperature in the International System.)

Apakah maksud suhu? (What is the meaning of temperature?)

• Ukuran darjah kepanasan atau darjah kesejukan sesuatu bahan. (The degree of hotness or coldness of a substance.)

• Tenaga yang mengalir dari objek panas ke objek sejuk. (Energy that flows from a hot object to a cold object.)

• Bacaan pada termometer apabila bahan dipanaskan. (The reading on a thermometer when a substance is heated.)

• Jumlah haba yang diperlukan untuk menaikkan suhu bahan. (The amount of heat needed to raise the substance’s temperature.)

Apakah alat dan unit piawai untuk menyukat suhu? (What is the instrument and standard unit for measuring temperature?)

• Barometer dan pascal. (Barometer and pascal.)

• Termometer dan darjah Celsius (°C). (Thermometer and degree Celsius (°C).)

• Termometer dan darjah Fahrenheit (°F). (Thermometer and degree Fahrenheit (°F).)

• Stesen cuaca dan darjah Celcius. (Weather station and degree Celcius.)

Gambar rajah di bawah menunjukkan termometer dengan dua skala suhu. Apakah unit bagi skala yang ditanda dengan huruf “F”? (The diagram below shows a thermometer with two temperature scales. What unit is represented by the scale labeled “F”?)

• Fahrenheit

• Celcius

• Joule

• Kelvin

Yang manakah tidak betul tentang cara menyukat suhu menggunakan termometer? (Which of the following is not correct about how to measure temperature using a thermometer?)

• Pegang termometer secara menegak semasa mengambil bacaan. (Hold the thermometer vertically upright when taking a reading.)

• Pastikan bebuli termometer terendam di dalam cecair yang diukur. (Ensure the thermometer bulb is submerged in the liquid being measured.)

• Pastikan bebuli termometer menyentuh dasar bekas cecair. (Ensure the thermometer bulb touches the bottom of the container.)

• Laraskan kedudukan mata pada aras meniskus cecair sebelum membaca suhu. (Adjust your eye position to the liquid’s meniscus level before reading the temperature.)

Haba mengalir dari ____. (Heat flows from ____.)

• objek sejuk ke objek panas. (a cold object to a hot object.)

• objek panas ke objek sejuk. (a hot object to a cold object.

• objek yang mempunyai suhu sama. (objects that have the same temperature.)

• persekitaran ke objek tanpa mengira suhu. (the surroundings to an object regardless of temperature.)

Apabila air dipanaskan lebih lama, suhunya akan ________, manakala apabila air disejukkan lebih lama, suhunya akan ________. (When water is heated for a longer time, its temperature ________, whereas when water is cooled for a longer time, its temperature ________.)

• bertambah, berkurang (increases, decreases)

• berkurang, bertambah (decreases, increases)

• kekal, berkurang (stays the same, decreases)

• bertambah, kekal (increases, stays the same)

Gambar menunjukkan termometer diletakkan di dalam ais. Berapakah takat beku air? (The image shows a thermometer placed in ice. What is the freezing point of water?)

• 0°C – Air membeku menjadi ais pada suhu ini. (0°C – Water freezes into ice at this temperature.)

• 25°C – Suhu bilik biasa. (25°C – Typical room temperature.)

• 32°F – Titik beku dalam unit Fahrenheit. (32°F – Freezing point in Fahrenheit.)

• 100°C – Takat didih air tulen. (100°C – The boiling point of pure water.)

Gambar menunjukkan air sedang mendidih di dalam cerek atas dapur. Berapakah takat didih air pada tekanan atmosfer? (The image below shows water boiling in a kettle on a stove. What is the boiling point of water at atmospheric pressure?)

• 212°C

• 100°C

• 50°C
  
  

• 0°C

Secawan air teh panas dibiarkan di atas meja pada suhu bilik seperti dalam gambar. Apakah yang akan berlaku kepada suhu air itu selepas 30 minit? (A cup of hot tea is left on a table at room temperature as shown in the picture. What will happen to the water’s temperature after 30 minutes?)

• Suhu air menurun menghampiri suhu bilik kerana haba mengalir ke persekitaran. (The water’s temperature drops to around room temperature as heat flows to the surroundings.)

• Suhu air meningkat kerana haba persekitaran mengalir ke dalam air. (The water’s temperature rises as heat from the surroundings flows into the water.)

• Suhu air kekal sama kerana tiada pertukaran haba berlaku. (The water’s temperature remains the same as no heat exchange occurs.)

• Air akan menjadi beku selepas 30 minit berada di bilik. (The water will become frozen after 30 minutes in the room.)