Online Daily Test Of Science For 7th Grade 2nd Standard Competition
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SETIAP SISWA HANYA DIPERKENANKAN MENGIKUTI 1 KALI ULANGAN HARIAN ONLINE.
Questions and Answers
- 1.
Kertas lakmus merah jika dimasukkan dalam suatu larutan sehingga menghasilkan warna merah, maka larutan bersifat…
Explanation
If red litmus paper turns red when placed in a solution, it indicates that the solution is neutral or neither acidic nor basic. The solution does not have an excess of hydrogen ions (H+) or hydroxide ions (OH-), which are characteristic of acidic and basic solutions, respectively. The presence of salt in the solution is not indicated by the red litmus paper test.Rate this question:
- 2.
Obat mag (Promag) merupakan contoh larutan ..... dalam kehidupan sehari-hari
Explanation
Promag adalah obat yang digunakan untuk mengatasi masalah pencernaan seperti maag. Obat ini mengandung bahan aktif yang bersifat basa, seperti magnesium hidroksida, yang dapat membantu menetralkan kelebihan asam dalam lambung. Dalam kehidupan sehari-hari, kita juga dapat menemukan larutan basa dalam berbagai hal, seperti sabun, deterjen, atau air sabun yang digunakan untuk mencuci tangan.Rate this question:
- 3.
Kertas lakmus merah yang dimasukkan dalam larutan cuka akan menjadi berwarna ....
Explanation
When red litmus paper is placed in vinegar solution, it will turn red. This is because red litmus paper is used to test for acids, and vinegar is an acidic solution. The red color indicates that the solution is acidic.Rate this question:
- 4.
Air sabun akan membuat kertas lakmus merah menjadi berwarna ...
Explanation
When soap bubbles are blown into the air and come into contact with red litmus paper, they cause a chemical reaction. This reaction causes the litmus paper to turn blue. Therefore, the correct answer is blue.Rate this question:
- 5.
Larutan yang derajat keasamannya kurang dari 7 maka akan bersifat ...
Explanation
Larutan yang derajat keasamannya kurang dari 7 akan bersifat asam. Ini berarti bahwa larutan tersebut memiliki konsentrasi ion hidrogen (H+) yang lebih tinggi daripada konsentrasi ion hidroksida (OH-). Larutan asam umumnya memiliki rasa asam, dapat menghasilkan gelembung gas ketika bereaksi dengan logam, dan memiliki pH kurang dari 7.Rate this question:
- 6.
Zat yang terasa licin di tangan (akustik) merupakan sifat dari larutan ...
Explanation
The correct answer is "basa" because a slippery feel on the hands is a characteristic of a basic solution. Basic solutions have a higher concentration of hydroxide ions (OH-) which can cause a soapy or slippery sensation when touched. This is in contrast to acidic solutions which typically have a sour taste and do not feel slippery.Rate this question:
- 7.
Derajat keasaman (pH) dalam angka di tuliskan dalam skala 1 sampai dengan ....
Explanation
The pH scale is a measure of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 0 being highly acidic, 7 being neutral, and 14 being highly alkaline. In this question, the correct answer is 14,empat belas, which indicates that the pH scale goes up to 14.Rate this question:
- 8.
Asam dan basa bila dicampur akan bereaksi dan menghasilkan larutan ...
Explanation
When acids and bases are mixed together, they undergo a chemical reaction known as neutralization. This reaction results in the formation of a salt. Therefore, the correct answer is "garam", which means salt in Indonesian.Rate this question:
- 9.
Semakin sedikit kadar emas yang dimiliki menunjukkan…
- A.
Semakin banyak kandungan emasnya
- B.
Semakin sedikit kandungan tembaganya
- C.
Semakin banyak kandungan tembaganya
- D.
Sama kandungan emas dan tembaganya
Correct Answer
C. Semakin banyak kandungan tembaganyaExplanation
The correct answer is "Semakin banyak kandungan tembaganya". This is because the statement "Semakin sedikit kadar emas yang dimiliki" means "The less gold content it has". Therefore, if the gold content is less, it means that there is more content of another metal, which in this case is "tembaga" (copper). So, the correct answer is that the more copper content it has.Rate this question:
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- 10.
Zat tunggal yang tidak dapat diuraikan lagi menjadi zat lain dengan rekasi kimia biasa disebut…
- A.
Senyawa
- B.
Unsur
- C.
Campuran
- D.
Larutan
Correct Answer
B. UnsurExplanation
The correct answer is "Unsur". This is because an unsur, or element in English, is a substance that cannot be broken down into simpler substances by ordinary chemical reactions. It is the basic building block of matter and is represented by a unique symbol on the periodic table. Senyawa (compound) is a substance composed of two or more elements chemically combined. Campuran (mixture) is a combination of two or more substances that are not chemically combined. Larutan (solution) is a homogeneous mixture of two or more substances.Rate this question:
-
- 11.
Unsur-unsur hidrogen tersusun dari atom-atom
- A.
Oksigen
- B.
Oksigen dan hidrogen
- C.
Hidrogen
- D.
Hidrogen dan air
Correct Answer
C. HidrogenExplanation
This answer is correct because the question asks for the elements that make up hydrogen, and the only element mentioned in the options is hydrogen itself. Therefore, the correct answer is hydrogen.Rate this question:
-
- 12.
Sifat komponen penyusun campuran adalah…
- A.
Berbeda dengan aslinya
- B.
Karbondioksida lebih banyak
- C.
Oksigen lebih banyak
- D.
Nitrogen lebih banyak
Correct Answer
A. Berbeda dengan aslinyaExplanation
The correct answer is "Berbeda dengan aslinya". This answer suggests that the components of the mixture are different from their original forms. This implies that the mixture is composed of different substances or elements that have undergone some sort of change or transformation.Rate this question:
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- 13.
Rumus yang menyatakan jenis dan jumlah atom yang menyusun zat disebut…
- A.
Rumus fisika
- B.
Rumus atom
- C.
Rumus empiris
- D.
Rumus molekul
Correct Answer
D. Rumus molekulExplanation
The correct answer is "Rumus molekul." Rumus molekul refers to the formula that represents the type and number of atoms in a molecule. It provides information about the composition of a substance at the molecular level. This formula is essential in understanding the structure and properties of compounds.Rate this question:
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- 14.
Udara segar yang kita hirup banyak mengandung…
- A.
Hidrogen lebih banyak
- B.
Karbondioksida lebih banyak
- C.
Oksigen lebih banyak
- D.
Air lebih banyak
Correct Answer
C. Oksigen lebih banyakExplanation
The correct answer is "Oksigen lebih banyak" because udara segar yang kita hirup mengandung lebih banyak oksigen. Oksigen sangat penting bagi kehidupan manusia karena digunakan oleh tubuh untuk proses respirasi dan pembakaran dalam sel-sel. Udara segar yang kaya oksigen dapat memberikan manfaat bagi kesehatan dan energi yang cukup untuk tubuh.Rate this question:
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- 15.
Rumus kimia yang menyatakan perbandingan terkecil jumlah atom pembentuk senyawa disebut…
- A.
Rumus atom
- B.
Rumus fisika
- C.
Rumus molekul
- D.
Rumus empiris
Correct Answer
C. Rumus molekulExplanation
Rumus molekul adalah rumus kimia yang menyatakan perbandingan terkecil jumlah atom pembentuk senyawa. Rumus ini memberikan informasi tentang jenis dan jumlah atom yang terdapat dalam satu molekul senyawa tersebut. Dengan menggunakan rumus molekul, kita dapat mengetahui komposisi kimia suatu senyawa dan menghitung massa molar senyawa tersebut.Rate this question:
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- 16.
Contoh campuran dalam kehidupan sehari-hari
- A.
Asam asetat, soda kue, udara
- B.
Emas, oksigen, hydrogen
- C.
Air sungai, tanah,timbal
- D.
Udara, makanan dan minuman
Correct Answer
D. Udara, makanan dan minumanExplanation
The correct answer is "Udara, makanan dan minuman". This answer is correct because it includes examples of various substances that are commonly found in everyday life. Udara (air) is a mixture of gases that we breathe, while makanan (food) and minuman (drinks) are essential for our sustenance. These examples demonstrate the presence of a mixture of different components in our daily lives.Rate this question:
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- 17.
Berikut ini merupakan senyawa , kecuali…
- A.
Emas
- B.
Air
- C.
Gula
- D.
Garam
Correct Answer
A. EmasExplanation
Emas bukanlah senyawa, melainkan unsur kimia. Senyawa terbentuk dari gabungan dua atau lebih unsur yang berbeda, sedangkan emas adalah unsur tunggal yang terdiri dari atom-atom emas. Oleh karena itu, emas tidak termasuk dalam daftar senyawa yang diberikan.Rate this question:
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- 18.
Berikut ini merupakan unsur, kecuali…
- A.
Emas
- B.
Perak
- C.
Perunggu
- D.
Besi
Correct Answer
C. PerungguExplanation
The given options are all metals, except for "Perunggu" which means bronze in Indonesian. Bronze is an alloy made primarily of copper and tin, and is not a pure metal like gold, silver, and iron. Therefore, "Perunggu" is the correct answer as it does not belong to the category of pure metals.Rate this question:
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Current Version
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Nov 04, 2024Quiz Edited by
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Nov 29, 2012Quiz Created by
Hariyadi95
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