Evaluasi Berkala Tahap 2
Kerjakan dengan jujur dan bertanggung jawab !
Questions and Answers
- 1.
Perhatikan tabel berikut!Besaran turunan, satuan dalam SI dengan alat ukur yang benar ditunjukkan oleh ....
- A.
(1), (2), dan (3)
- B.
(2), (3), dan (4)
- C.
(3), (4), dan (1)
- D.
(4), (2), dan (1)
Correct Answer
D. (4), (2), dan (1)Explanation
The correct answer is (4), (2), dan (1). This is because the correct order for the derivative quantities, SI units, and proper measuring instruments is (4), (2), dan (1).Rate this question:
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- 2.
Perhatikan gambar!Disediakan sebuah gelas ukur kosong, kemudian dituangkan segelas air ke dalam gelas ukur itu. Selanjutnya, sebuah batu dimasukkan ke dalamnya sehingga tampak seperti pada gambar. Dalam rangkaian peristiwa tersebut dapat disimpulkan zat P, zat Q, dan zat R masing-masing …
- A.
![Evaluasi Berkala Tahap 2 - Quiz]()
- B.
![Evaluasi Berkala Tahap 2 - Quiz]()
- C.
![Evaluasi Berkala Tahap 2 - Quiz]()
- D.
![Evaluasi Berkala Tahap 2 - Quiz]()
Correct Answer
C. -
- 3.
Ibu mencampur 2 kg air yang suhunya 100ºC dengan 5 kg air yang suhunya 30ºC. Berapa suhu akhir campuran?
- A.
75ºC
- B.
50ºC
- C.
45ºC
- D.
30ºC
Correct Answer
B. 50ºCExplanation
When two substances with different temperatures are mixed together, the final temperature of the mixture can be calculated using the principle of heat transfer. In this case, the first substance is 2 kg of water at 100°C, and the second substance is 5 kg of water at 30°C. To find the final temperature, we can use the equation:
(m1 x T1 + m2 x T2) / (m1 + m2)
where m1 and m2 are the masses of the substances and T1 and T2 are their respective temperatures. Plugging in the values, we get:
(2 kg x 100°C + 5 kg x 30°C) / (2 kg + 5 kg) = 50°C
Therefore, the final temperature of the mixture is 50°C.Rate this question:
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- 4.
Perhatikan gambar berikut!Peristiwa sehari-hari yang terjadi berdasarkan konsep hukum III Newton ditunjukkan oleh gambar . . .
- A.
1 dan 2
- B.
1 dan 3
- C.
2 dan 3
- D.
2 dan 4
Correct Answer
D. 2 dan 4Explanation
The correct answer is 2 dan 4. Without the image provided, it is difficult to determine the exact events that are being referred to. However, based on the given options, it can be inferred that the events depicted in images 2 and 4 are related to Newton's third law of motion. This law states that for every action, there is an equal and opposite reaction. Therefore, it is likely that the events shown in images 2 and 4 demonstrate this principle.Rate this question:
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- 5.
Perhatikan gambar berikut!Sebuah mobil melaju kencang di jalan raya dan menyalib/mendahului mobil lain yang ada di sebelahnya. Jika kecepatan mobil tersebut 144 km/jam dan massanya 1.500 kg. Energi kinetik yang dimiliki mobil tersebut adalah....
- A.
30 kJ
- B.
60 kJ
- C.
1.200 kJ
- D.
12.000 kJ
Correct Answer
C. 1.200 kJExplanation
The kinetic energy of an object is given by the equation KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object. In this case, the mass of the car is given as 1,500 kg and the velocity is given as 144 km/h. To calculate the kinetic energy, we need to convert the velocity from km/h to m/s by dividing it by 3.6. After converting, we can plug the values into the equation to find the kinetic energy, which is 1,200 kJ.Rate this question:
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- 6.
Perhatikan gambar!Kelompok pesawat sederhana yang sejenis dari alat-alat seperti tampak pada gambar tersebut, ditunjukkan pada gambar nomor ....
- A.
1 dan 2
- B.
2 dan 3
- C.
3 dan 4
- D.
4 dan 1
Correct Answer
A. 1 dan 2Explanation
The correct answer is 1 dan 2.Rate this question:
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- 7.
Perhatikan gambar alat alarm kebakaran dan tabel koefisien muai panjang zat berikut ini!Dari data yang tampak pada gambar (I) dan (II) serta tabel, disimpulkan bahwa….
- A.
![Evaluasi Berkala Tahap 2 - Quiz]()
- B.
![Evaluasi Berkala Tahap 2 - Quiz]()
- C.
![Evaluasi Berkala Tahap 2 - Quiz]()
- D.
![Evaluasi Berkala Tahap 2 - Quiz]()
Correct Answer
C.Explanation
From the data shown in the picture (I) and (II), as well as the coefficient of linear expansion table, it can be concluded that the material used in the fire alarm device is chosen based on its coefficient of linear expansion. The material with a higher coefficient of linear expansion will expand more when heated, causing the alarm to activate.Rate this question:
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- 8.
Perhatikan gambar!Agar kedua pengisap seimbang, maka besar F adalah . . . .
- A.
20 N
- B.
40 N
- C.
60 N
- D.
100 N
Correct Answer
D. 100 NExplanation
The correct answer is 100 N because in order for the two suction cups to be balanced, the force exerted by each suction cup must be equal. Since there is only one suction cup shown in the image, the force exerted by that suction cup must be equal to the combined force exerted by the two suction cups. Therefore, the force F must be 100 N.Rate this question:
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- 9.
Gambar berikut ini menunjukkan grafik simpangan terhadap waktu suatu gelombang pada taliDari data yang tampak pada grafik tersebut, disimpulkan bahwa .....
- A.
![Evaluasi Berkala Tahap 2 - Quiz]()
- B.
![Evaluasi Berkala Tahap 2 - Quiz]()
- C.
![Evaluasi Berkala Tahap 2 - Quiz]()
- D.
![Evaluasi Berkala Tahap 2 - Quiz]()
Correct Answer
B. -
- 10.
Perhatikan gambar di bawah!Jika bandul C diayun, maka bandul yang turut berayun adalah....
- A.
A dan E, karena frekuensinya sama
- B.
A dan B, berat bebanya sama besar
- C.
B dan D, panjang tali penggantungnya sama
- D.
D dan E, keduanya berdekatan
Correct Answer
A. A dan E, karena frekuensinya samaExplanation
The correct answer is A dan E, karena frekuensinya sama. This means that the pendulums A and E will swing together because they have the same frequency. The frequency of a pendulum is determined by the length of its string and the acceleration due to gravity. Since the lengths of the strings for pendulums A and E are the same, their frequencies will also be the same. Therefore, when pendulum C is swung, pendulums A and E will also swing at the same frequency.Rate this question:
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- 11.
Benda terletak di depan lensa dan bayangannya tampak seperti gambar!Jarak fokus lensa berdasarkan data pada gambar tersebut adalah ….
- A.
80 cm
- B.
30 cm
- C.
15 cm
- D.
40 cm
Correct Answer
D. 40 cmExplanation
Based on the given information, the object is located in front of the lens and its image appears as a picture. The distance between the object and the lens is the object distance (u). The image distance (v) is the distance between the lens and the image formed. The focal length (f) of the lens can be calculated using the lens formula: 1/f = 1/v - 1/u. Since the image appears as a picture, it can be inferred that the image distance is equal to the focal length of the lens. Therefore, the focal length of the lens in this case is 40 cm.Rate this question:
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- 12.
Kaca digosok dengan kain sutera. Setelah penggosokan berulang-ulang, kaca memperoleh muatan listrik ....
- A.
Negatif, karena kaca menerima elektron dari sutera
- B.
Negatif, karena kaca melepaskan elektron ke sutera
- C.
Positif, karena kaca melepaskan elektron ke sutera
- D.
Positif, karena kaca menerima proton dari sutera
Correct Answer
C. Positif, karena kaca melepaskan elektron ke suteraExplanation
When glass is rubbed with silk, it gains a positive charge because it loses electrons to the silk. This is due to the triboelectric effect, where certain materials become electrically charged when they come into contact and then separate. In this case, the glass has a higher affinity for electrons compared to silk, causing it to lose electrons and become positively charged.Rate this question:
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- 13.
Perhatikan rangkaian listrik berikut!Berdasarkan data pada gambar, kuat arus listrik I1 adalah ....
- A.
9A
- B.
7,5A
- C.
5,5A
- D.
4,5A
Correct Answer
C. 5,5AExplanation
Based on the given circuit diagram, the current flowing through the branch containing I1 is determined by the current divider rule. The current divider rule states that the current through a branch is inversely proportional to the resistance of that branch. Since the resistance of the branch containing I1 is higher compared to the other branch, the current flowing through it (I1) will be lower. Therefore, the correct answer is 5.5A.Rate this question:
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- 14.
Lampu pijar dihubungkan pada jaringan listrik PLN dengan tegangan 220V. Jika kuat arus listrik yang mengalir pada lampu 500mA, energi yang diperlukan lampu untuk menyala selama 10 menit adalah....
- A.
13200J
- B.
66000J
- C.
110000J
- D.
660000J
Correct Answer
B. 66000JExplanation
The energy consumed by an electrical device can be calculated using the formula: E = P × t, where E is the energy in joules, P is the power in watts, and t is the time in seconds. In this case, the power can be calculated using the formula: P = V × I, where V is the voltage in volts and I is the current in amperes. Given that the voltage is 220V and the current is 500mA (which is equivalent to 0.5A), we can calculate the power as P = 220V × 0.5A = 110W. Since the time is given as 10 minutes (which is equivalent to 600 seconds), we can calculate the energy as E = 110W × 600s = 66000J. Therefore, the correct answer is 66000J.Rate this question:
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- 15.
Balok besi KL dan MN didekatkan pada batang magnet seperti gambar.Ujung K-L-M-N secara berturutan menjadi kutub magnet ....
- A.
U-S-U-S
- B.
S-U-S-U
- C.
U-S-S-U
- D.
S-U-US
Correct Answer
A. U-S-U-SExplanation
When the iron bars KL and MN are brought close to a magnet, the magnetic field induces a temporary magnetism in the iron bars. This causes the ends K and N to become magnetized with opposite poles. Since opposite poles attract, the end K becomes a south pole, attracting the north pole of the magnet. Similarly, the end N becomes a north pole, attracting the south pole of the magnet. The middle ends L and M, being closer to the magnet, experience a stronger magnetic field and become magnetized with the opposite polarity to K and N. Therefore, the correct sequence of magnetization is U-S-U-S.Rate this question:
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- 16.
Lampu sepeda yang dihidupkan dengan menggunakan dinamo, menyala makin terang ketika sepeda berjalan makin cepat karena ....
- A.
Medan magnet yang timbul makin besar
- B.
Perubahan jumlah garis gaya magnet dalam kumparan makin cepat
- C.
Jumlah garis gaya magnet yang memotong kumparan makin besar
- D.
Inti besi pada kumparan memperbesar medan magnet
Correct Answer
B. Perubahan jumlah garis gaya magnet dalam kumparan makin cepatExplanation
The correct answer is "perubahan jumlah garis gaya magnet dalam kumparan makin cepat." When the bicycle moves faster, the speed of the rotation of the dynamo increases. This leads to a faster change in the number of magnetic field lines passing through the coil of the dynamo. According to Faraday's law of electromagnetic induction, a faster change in the magnetic field induces a larger current in the coil. As a result, the brightness of the bicycle lamp increases as the speed of the bicycle increases.Rate this question:
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- 17.
Perhatikan posisi matahari (M), bumi (B) dan bulan (b) berikut iniPosisi bulan yang menyebabkan pasang naik maksimum air laut terjadi pada nomor
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1Explanation
The correct answer is 1 because it is the position where the moon is directly aligned with the sun and the Earth, creating a gravitational pull that causes the highest tidal range. This alignment is known as the syzygy and it occurs during the new moon and full moon phases.Rate this question:
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- 18.
Data komposisi pada kemasan makanan: Tepung terigu, tepung tapioka, minyak sayur, perisa ayam, rempah-rempah, pemantap nabati, tartrazin Cl 19140, monosodium glutamate, asam folat, garam gula, dan bubuk cabe.Bahan peyedap sintetis yang terdapat pada makanan tersebut adalah ....
- A.
Monosodium glutamat
- B.
Tartrazin Cl 19140
- C.
Pemantap nabati
- D.
Rempah-rempah
Correct Answer
A. Monosodium glutamatExplanation
The correct answer is monosodium glutamate. Monosodium glutamate is a synthetic flavor enhancer commonly used in food products. It is often added to enhance the savory taste of food and create a more satisfying flavor. In this case, monosodium glutamate is listed as one of the ingredients in the composition of the food packaging, indicating that it is a synthetic flavor enhancer present in the food.Rate this question:
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- 19.
Narkotika golongan halusinogen menyebabkan pemakainya berhalusinasi (berkhayal). Efek halusinasi menunjukkan bahwa narkotika jenis tersebut ….
- A.
Mempengaruhi fungsi system saraf pusat
- B.
Menurunkan fungsi saraf simpatik
- C.
Meningkatkan saraf parasimpatik
- D.
Menghambat kerja sumsum tulang belakang
Correct Answer
A. Mempengaruhi fungsi system saraf pusatExplanation
Halusinogen adalah jenis narkotika yang dapat menyebabkan pemakainya mengalami halusinasi atau berkhayal. Halusinasi adalah pengalaman sensorik yang tidak nyata, seperti melihat, mendengar, atau merasakan sesuatu yang sebenarnya tidak ada. Efek halusinasi ini menunjukkan bahwa narkotika golongan halusinogen mempengaruhi fungsi sistem saraf pusat, yaitu bagian sistem saraf yang terdiri dari otak dan sumsum tulang belakang.Rate this question:
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- 20.
Perhatikan gambar berikut.Mahluk hidup yang menunjukkan proses menanggapi dan menerima rangsang cahaya adalah gambar nomor ….
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
D. 4Explanation
The correct answer is 4 because the image shows a plant bending towards the light source. This is a response to the stimulus of light, known as phototropism. Plants have the ability to detect the direction of light and adjust their growth accordingly to maximize their exposure to sunlight for photosynthesis. This process allows plants to receive the necessary energy for growth and survival.Rate this question:
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- 21.
Perhatikan nama-nama hewan berikut.
- lumba-lumba
- bandeng
- pesut
- kakap
- A.
1 dan 2
- B.
1 dan 3
- C.
2 dan 4
- D.
3 dan 4
Correct Answer
B. 1 dan 3Explanation
The animals mentioned in the question are lumba-lumba (dolphin), bandeng (milkfish), pesut (Irrawaddy dolphin), and kakap (grouper). Among these animals, dolphins (lumba-lumba) and Irrawaddy dolphins (pesut) are mammals. Therefore, the correct answer is 1 and 3, which means option 1 and option 3 are correct.Rate this question:
- 22.
Contoh interaksi antara dua makhluk hidup berikut yang merupakan simbiosis komensalisme adalah....
- A.
Bakteri patogen dengan jamur Pennicilium notatum
- B.
Interaksi yang erat antara harimau dengan rusa
- C.
Tanaman Azzola pinata dengan bakteri nitrogen
- D.
Tanaman paku dengan pohon inang yang ditumpanginya
Correct Answer
D. Tanaman paku dengan pohon inang yang ditumpanginyaExplanation
The correct answer is "tanaman paku dengan pohon inang yang ditumpanginya". This is an example of commensalism symbiosis because the fern benefits by using the host tree for support and access to sunlight, while the host tree is not harmed or benefited.Rate this question:
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- 23.
Perhatikan grafik berikutGrafik yang menunjukan hubungan antara kebutuhan air bersih akibat pengaruh peningkatan populasi manusia diperkotaan adalah....X: kepadatan populasi manusiaY: kebutuhan air bersih
- A.
![Evaluasi Berkala Tahap 2 - Quiz]()
- B.
![Evaluasi Berkala Tahap 2 - Quiz]()
- C.
![Evaluasi Berkala Tahap 2 - Quiz]()
- D.
![Evaluasi Berkala Tahap 2 - Quiz]()
Correct Answer
A.Explanation
Grafik tersebut menunjukkan bahwa semakin tinggi kepadatan populasi manusia (X), semakin tinggi juga kebutuhan air bersih (Y) akibat peningkatan populasi manusia di perkotaan. Ini menunjukkan adanya hubungan positif antara kepadatan populasi manusia dan kebutuhan air bersih. Semakin banyak manusia yang tinggal di perkotaan, semakin banyak pula kebutuhan mereka akan air bersih.Rate this question:
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- 24.
Perhatikan tabel berikutData pada tabel yang sesuai untuk masing-masing jenis sel darah adalah ….
- A.
1 dan 2
- B.
2 dan 3
- C.
3 dan 4
- D.
4 dan 1
Correct Answer
D. 4 dan 1Explanation
The correct answer is "4 dan 1". This suggests that the data in the table corresponds to the fourth type of blood cell and the first type of blood cell. However, without further information or context, it is difficult to determine the exact meaning of the numbers and how they relate to the types of blood cells.Rate this question:
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- 25.
Perhatikan gambar berikutZat yang dihasilkan oleh bagian yang ditunjuk dengan tanda panah memiliki fungsi....
- A.
Mengendapkan protein pada kasein
- B.
Mengasamkan cairan dalam lambung
- C.
Menghancurkan partikel-partikel lemak
- D.
Mengaktifkan pepsinigen menjadi pepsin
Correct Answer
C. Menghancurkan partikel-partikel lemakExplanation
The correct answer is "menghancurkan partikel-partikel lemak". This is because the arrow in the picture is pointing towards a part of the digestive system, which suggests that the substance produced by that part is involved in the process of breaking down fat particles. Therefore, it can be inferred that the substance functions to destroy or break apart fat particles.Rate this question:
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- 26.
Perhatikan data berikut!
- Kontraksi otot tulang rusuk, rongga dada terangkat
- Paru-paru membesar
- Tekanan udara dalam paru-paru besar
- Udara luar masuk ke dalam paru-paru
- A.
1, 2 dan 3
- B.
1, 2 dan 4
- C.
2, 3 dan 4
- D.
3, 4 dan 1
Correct Answer
B. 1, 2 dan 4Explanation
The given data describes the process of inspiration during breathing. The contraction of the rib muscles and the lifting of the chest cavity indicate the expansion of the lungs. This expansion leads to an increase in the air pressure inside the lungs. As a result, the external air enters the lungs. Therefore, the correct answer is 1, 2, and 4, as these options include the steps mentioned in the data.Rate this question:
- 27.
Perhatikan gambar berikut!Pernyataan berikut yang benar terkait dengan gambar tersebut, adalah...
- A.
A dan B bergerak hanya dua arah
- B.
B bergerak ke segala arah dan A diam
- C.
A bergerak ke segala arah dan B diam
- D.
A dan B dapat bergerak ke segala arah
Correct Answer
B. B bergerak ke segala arah dan A diamExplanation
Based on the given image, it can be observed that B is shown moving in multiple directions, while A is shown to be stationary. Therefore, the correct statement is that B moves in all directions while A remains still.Rate this question:
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- 28.
Perhatikan data berikut ini:
- KOH
- NaCl
- HNO3
- KNO3
- HCl
- A.
1 dan 3
- B.
2 dan 5
- C.
3 dan 4
- D.
4 dan 5
Correct Answer
D. 4 dan 5Explanation
Senyawa asam adalah senyawa yang dapat melepaskan ion H+ (ion hidrogen) ketika dilarutkan dalam air. Dalam data yang diberikan, hanya HNO3 (asam nitrat) dan HCl (asam klorida) yang merupakan senyawa asam. Oleh karena itu, nomor 4 dan 5 (HNO3 dan HCl) merupakan senyawa asam dalam data tersebut.Rate this question:
- 29.
Perhatikan gambar!Bagian yang ditunjuk dengan tanda panah berfungsi untuk...
- A.
Menghantarkan impuls menuju ke badan sel saraf
- B.
Menghantarkan impuls dari badan sel ke sel otot
- C.
Mempercepat jalannya impuls ke pusat koordinasi sel
- D.
Menjawab rangsang dan menghantarkannya ke indera
Correct Answer
A. Menghantarkan impuls menuju ke badan sel sarafExplanation
The arrow in the image is pointing towards a structure that is responsible for conducting impulses towards the cell body of a nerve cell. This suggests that the function of the structure is to transmit signals towards the nerve cell body.Rate this question:
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- 30.
Perhatikan gambar penampang daun berikut!Bagian yang ditunjuk dengan huruf Y berfungsi untuk ….
- A.
Mengangkut hasil fotosintesis
- B.
Melindungi jaringan yang di bawahnya
- C.
Mengangkut air yang masuk dari batang
- D.
Menyimpan cadangan makanan
Correct Answer
D. Menyimpan cadangan makananExplanation
The correct answer is "menyimpan cadangan makanan." The image shows a cross-section of a leaf, and the part labeled as Y is the mesophyll layer. The mesophyll layer contains chloroplasts where photosynthesis occurs, and it also functions as a storage site for carbohydrates produced during photosynthesis. Therefore, it is responsible for storing food reserves in the form of starch.Rate this question:
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- 31.
Perhatikan gambar salah satu jenis Leguminaceae berikut!Apabila intensitas cahaya lemah (malam hari) maka respon yang dilakukan oleh tumbuhan tersebut adalah....
- A.
Mekar bagian mahkota bunga
- B.
Menutup daun majemuk
- C.
Memecahkan polong biji
- D.
Menutup bagian kelopak bunga
Correct Answer
B. Menutup daun majemukExplanation
The correct answer is "menutup daun majemuk" because leguminous plants have compound leaves that can fold or close in response to low light conditions, such as during the night. This behavior helps to reduce water loss and protect the plant from potential damage.Rate this question:
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- 32.
Perhatikan gambar percobaan Fotosintesis berikut!Tujuan dari tahapan III adalah ...
- A.
Mematikan sel-sel yang menyusun jaringan pada daun
- B.
Melemahkan bakteri yang melekat pada daun
- C.
Melarutkan klorofil yang terdapat pada daun
- D.
Menentukan jenis zat hasil proses fotosintesis
Correct Answer
C. Melarutkan klorofil yang terdapat pada daunExplanation
In the given question, the image shows a process of photosynthesis. The purpose of stage III in photosynthesis is to break down or dissolve the chlorophyll present in the leaves. This is because chlorophyll captures light energy and plays a crucial role in the conversion of sunlight into chemical energy during photosynthesis. Therefore, the correct answer is "melarutkan klorofil yang terdapat pada daun" which means "dissolving the chlorophyll present in the leaves."Rate this question:
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- 33.
Perhatikan pernyataan berikut!
- Tidak kembali pada bentuk semula
- Bertambah ukuran
- Bertambahnya kedewasaan
- Matangnya organ-organ reproduksi
- A.
3 dan 4
- B.
2 dan 3
- C.
1 dan 3
- D.
1 dan 2
Correct Answer
A. 3 dan 4Explanation
The statement "Bertambah ukuran" indicates growth, which is a characteristic of development. The statement "Matangnya organ-organ reproduksi" indicates the maturity of reproductive organs, which is also a characteristic of development. Therefore, the correct answer is 3 dan 4.Rate this question:
- 34.
Perhatikan contoh berikut!
- Ikan air laut mengekskresi urine pekat agar terjaga keseimbangan kadar air tubuhnya
- Rayap sering memakan kembali kulit ari kelupasannya
- Beruang kutub tidur panjang saat musim dingin
- Herbivora menghasilkan enzim selulase untuk mencerna selulosa
- A.
1 dan 2
- B.
1 dan 3
- C.
2 dan 3
- D.
4 dan 1
Correct Answer
D. 4 dan 1Explanation
The correct answer is 4 dan 1. This is because the statement "Ikan air laut mengekskresi urine pekat agar terjaga keseimbangan kadar air tubuhnya" (Marine fish excrete concentrated urine to maintain body water balance) and "Herbivora menghasilkan enzim selulase untuk mencerna selulosa" (Herbivores produce cellulase enzyme to digest cellulose) both indicate physiological adaptations. These adaptations help the marine fish and herbivores to survive and thrive in their respective environments.Rate this question:
- 35.
Persilangan antara tanaman ercis berbiji bulat dengan tanaman ercis berbiji kerut menghasilkan tanaman ercis berbiji bulat. Apabila F1 disilangkan dengan sesamanya maka akan diperoleh perbandingan fenotip F2 ...
- A.
1: 1
- B.
1: 2
- C.
2: 1
- D.
3: 1
Correct Answer
D. 3: 1Explanation
When two plants with round-seeded and wrinkled-seeded traits are crossed, and the resulting plant has round seeds, it indicates that the round-seeded trait is dominant. When the F1 generation is crossed with itself, the resulting F2 generation will have a phenotypic ratio of 3:1, meaning that for every three plants with round seeds, there will be one plant with wrinkled seeds. This is because the round-seeded trait is dominant and the wrinkled-seeded trait is recessive.Rate this question:
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- 36.
Mikroba yang dimanfaatkan dalam pembuatan produk keju adalah ...
- A.
Lactobacillus plantarum
- B.
Lactobacillus lactis
- C.
Aspergillus soyae
- D.
Saccaromyces cereviceae
Correct Answer
B. Lactobacillus lactisExplanation
Lactobacillus lactis is used in the production of cheese because it is a lactic acid bacteria that plays a crucial role in the fermentation process. This bacteria helps convert lactose, the sugar present in milk, into lactic acid. The production of lactic acid lowers the pH of the milk, which creates an acidic environment that inhibits the growth of harmful bacteria and promotes the growth of desirable bacteria. Lactobacillus lactis also contributes to the flavor and texture development of cheese through its metabolic activities during fermentation.Rate this question:
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- 37.
Adi mengamati suatu fenomena bahwa besi dapat ditarik oleh gaya magnet. Dia juga menjumpai fakta besi juga dapat berkarat bila bereaksi dengan oksigen yang ada di udara. Kesimpulan tentang sifat besi tersebut adalah ... .
- A.
Besi dapat ditarik magnet adalah sifat kimia, besi berkarat adalah sifat fisika.
- B.
Besi dapat ditarik magnet adalah sifat fisika, besi berkarat adalah sifat kimia
- C.
Besi dapat ditarik magnet adalah sifat fisika, besi berkarat adalah sifat fisika
- D.
Besi dapat ditarik magnet adalah sifat kimia, besi berkarat adalah sifat kimia
Correct Answer
B. Besi dapat ditarik magnet adalah sifat fisika, besi berkarat adalah sifat kimiaExplanation
The correct answer is "Besi dapat ditarik magnet adalah sifat fisika, besi berkarat adalah sifat kimia". This is because the ability of iron to be attracted to a magnet is a physical property, as it can be observed and measured without changing the chemical composition of the iron. On the other hand, the rusting of iron when it reacts with oxygen in the air is a chemical property, as it involves a chemical reaction that changes the composition of the iron.Rate this question:
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- 38.
Budi mereaksikan karbit dengan air, dan merasakan terjadinya kenaikan suhu pada dinding gelas tempat reaksi dilakukan. Besar kenaikan suhu diukur dengan termometer. Yang dapat disimpulkan dari hal tersebut adalah ...
- A.
Terjadi perubahan kimia yang endoterm
- B.
Terjadi perubahan kimia yang eksoterm
- C.
Terjadi perubahan fisika yang endoterm
- D.
Terjadi perubahan fisika yang eksoterm
Correct Answer
B. Terjadi perubahan kimia yang eksotermExplanation
From the given information, Budi observed an increase in temperature when he mixed karbit with water. This indicates that a chemical reaction took place. The increase in temperature suggests that the reaction is exothermic, meaning it releases heat to the surroundings. Therefore, the correct answer is "Terjadi perubahan kimia yang eksoterm" (There is an exothermic chemical change).Rate this question:
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- 39.
Kondisi air sungai yang berada di kota besar sangat memprihatinkan, warnanya airnya hitam, bau tidak sedap akibat tercemar limbah rumah tangga maupun limbah industri, usaha yang dapat di lakukan oleh anggota masyarakat untuk mengatasi pencemaran tersebut adalah ….
- A.
Melarang penggunaan detergent di rumah tangga
- B.
Menutup pabrik pembuat makanan kemasan kaleng
- C.
Membuat saluran pembuangan limbah rumah tangga
- D.
Membuat undang-undang anti pencemaran air
Correct Answer
C. Membuat saluran pembuangan limbah rumah tanggaExplanation
The correct answer suggests that one way to address the pollution problem in the river is to create a separate channel for household waste disposal. This would help to prevent the mixing of household waste with the river water, reducing pollution levels.Rate this question:
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- 40.
Perhatikan gambar berikut!Bagian yang ditunjuk oleh tanda panah, berfungsi untuk....
- A.
Menyaring darah yang masuk tubulus
- B.
Menyerap kembali urine primer yang masuk
- C.
Menampung urine dari tubulus kolektivus
- D.
Menambahkan zat-zat yang harus dibuang
Correct Answer
C. Menampung urine dari tubulus kolektivusExplanation
The correct answer is "menampung urine dari tubulus kolektivus" because the arrow is pointing to a structure called the bladder, which is responsible for storing urine before it is expelled from the body.Rate this question:
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