# Latihan Un IPA 2018 F

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| By Sumantri115top
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Ayo kita latihan lagi agar dapat hasil maksimal di UNBK 2018

• 1.

### Beberapa buah gaya yang segaris bekerja pada balok seperti gambar di bawah ini. Dari gambar tersebut balok yang mempunyai percepatan terbesar adalah ….

• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

C. (3)
Explanation
The block with the greatest acceleration is (3) because it has the largest net force acting on it. This can be determined by looking at the diagram and comparing the magnitudes and directions of the forces acting on each block. The block in (3) has the largest force acting to the right, which results in a greater acceleration compared to the other blocks.

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• 2.

### Perhatikan daftar berikut: l. Fusarum sp 2. Rhizobium sp 3. Chlorella sp 4. Spirulina sp, Jamur dan gangang yang menjadi sumber makanan kelompok protein sel tunggal (PST) adalah ....

• A.

1 ,2, dan 3

• B.

1 ,3, dan 4

• C.

2,3, dan 4

• D.

1,2 dan 4

B. 1 ,3, dan 4
Explanation
The correct answer is 1, 3, and 4. This is because Fusarum sp, Chlorella sp, and Spirulina sp are all types of single-celled organisms that belong to the group of protein-rich fungi and algae. Rhizobium sp, on the other hand, is a type of bacteria and does not fall into this category. Therefore, options 2 and 3 are incorrect.

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• 3.

### Perhatikan diagram persilangan berikut! Berdasarkan diagram tersebut, genotipe MmBb ditunjukan oleh nomor ....

• A.

1,2,3,4

• B.

1,6, 11,16

• C.

4,7,10, 13

• D.

9, 10, 1 4, 15

C. 4,7,10, 13
• 4.

### Dua kelompok siswa melakukan percobaan sebagai berikut: Kedua percobaan menunjukkan bahwa fotosintesis ....

• A.

menghasilkan amilum

• B.

menghasilkan oksigen

• C.

memerlukan cahaya matahari

• D.

. tidak tergantung sinar matahari

C. memerlukan cahaya matahari
Explanation
The correct answer is "memerlukan cahaya matahari" because both experiments showed that photosynthesis requires sunlight.

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• 5.

### Perhatikan skema penampang melintang akar berikut! Bagian akar yang berfungsi untuk memperluas bidang penyerapan air dan garam mineral adalah ....

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
Explanation
The correct answer is 1. In the given cross-sectional diagram of a root, the part that is responsible for increasing the surface area for water and mineral absorption is the root hairs. These tiny, finger-like projections on the surface of the root increase the surface area available for absorption, allowing the plant to take in more water and nutrients from the soil.

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• 6.

### Perhatikan gambar berikut! Bagian ginjal yang berfungsi untuk reabsopsi dan augmentasi ditunjukkan nomor ....

• A.

1 dan 2

• B.

1 dan 3

• C.

2 dan 3

• D.

2 dan 4

B. 1 dan 3
Explanation
The correct answer is 1 and 3. The question asks for the parts of the kidney that function in reabsorption and augmentation. The numbers 1 and 3 are indicated as the correct answer options. Therefore, the parts of the kidney that perform reabsorption and augmentation are represented by numbers 1 and 3.

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• 7.

### Para ahli Biologi pernah melakukan percobaan yang membuktikan bahwa pengambilan bagian kulit batang tumb han akan mengakibatkan gangguan yang serius pada aliiran senyawa organik ke akar. Jaringan yang terbuang pada saat pengambilan kulit batang adalah ....

• A.

Xilem

• B.

Epidermis

• C.

Floem

• D.

Kambium

C. Floem
Explanation
The correct answer is floem. This is because the passage states that removing the bark of a plant stem will result in serious disruption of the flow of organic compounds to the roots. The phloem is responsible for transporting these organic compounds, such as sugars, from the leaves to other parts of the plant, including the roots. Therefore, removing the bark, which contains the phloem tissue, would indeed interfere with the flow of organic compounds to the roots.

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• 8.

• A.

Elastis, mengandung 02

• B.

Tidak elastis, mengandung 02

• C.

Elastis, mengandung CO2

• D.

Tidak elastis, mengandung CO

C. Elastis, mengandung CO2
Explanation
Pembuluh darah dari jantung menuju ke paru-paru adalah elastis, mengandung CO2. Elastisitas pembuluh darah memungkinkan mereka untuk mengikuti pergerakan jantung dan mengatur aliran darah dengan baik. Pembuluh darah ini juga mengandung CO2 yang akan dibawa ke paru-paru untuk dikeluarkan dari tubuh melalui proses pernapasan.

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• 9.

### Perhatikan grafik berikut! Udara residu di tunjukkan oleh nomor ... .

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
Explanation
The correct answer is 1 because the graph shows residual air and the number 1 is pointing to it.

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• 10.

### Perhatikan gambar rangka berikut! Kerja sama antar otot yang menimbulkan gerak flexor dan ekstensor terjadi pada bagian yang ditunjuk oleh huruf ….

• A.

P dan Q

• B.

P dan R

• C.

R dan S

• D.

Q dan S

D. Q dan S
Explanation
Kerja sama antar otot yang menimbulkan gerak flexor dan ekstensor terjadi pada bagian yang ditunjuk oleh huruf Q dan S.

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• 11.

### Perhatikan tabel berikut! Berdasarkan tabel tersebut, bahan makanan yang mengandung glukosa adalah ....

• A.

1,2, dan 3

• B.

2,4, dan 5

• C.

1,2, dan 5

• D.

2,3, dan 5

C. 1,2, dan 5
Explanation
The correct answer is 1,2, and 5. Based on the table, the food items that contain glucose are item 1, item 2, and item 5.

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• 12.

### Perhatikan gambar berikut! Booming Eceng Gondok pada Danau seperti pada gambar mengakibatkan menurunnya cahaya matahari sehingga kelarutan oksigen di dalam air berkurang. Limbah rumah tangga yang dapat menyebabkan masalah tersebut adalah ....

• A.

sisa sayuran

• B.

Sampah plastik

• C.

Air deterjen

• D.

Sampah kertas

C. Air deterjen
Explanation
The correct answer is "air deterjen" because detergents contain chemicals that can be harmful to aquatic life. When detergents enter the water, they can reduce the oxygen levels and disrupt the balance of the ecosystem. This can lead to a decrease in the solubility of oxygen in the water, causing harm to the organisms living in it.

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• 13.

### Perhatikan grafik statistik kependudukan berikut! Berdasarkan statistik Kependudukan Indonesia tersebut, dampak yang terjadi berkaiatan dengan kualitas lin kungan adalah....

• A.

Meningkatkan udara bersih

• B.

• C.

Terpenuhinya air bersih bagi penduduk

• D.

Terpenuhinya perumahan bagi penduduk

Explanation
The correct answer is "menurunkan udara bersih". Based on the given population statistics, the impact that is related to environmental quality is a decrease in clean air. This implies that the increase in population has led to pollution and a decline in air quality.

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• 14.

### Berdasarkan ciri-cirinya hewan-hewan tersebut dimasukkan ke dalam kelompok ....

• A.

lnsecta

• B.

Crustaceae

• C.

Arachnida '

• D.

Myriapoda

B. Crustaceae
Explanation
Based on the characteristics mentioned, the animals are classified into the group Crustaceae.

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• 15.

### Seorang siswa melakukan pengamatan mikroorganisme dengan mikroskop di laboratorium lPA, bayangan gambar sudah didapatkan namun belum fokus dan jelas.m Upaya untuk mendapatkan gambar yang fokus dan jelas adalah ....

• A.

Mernutar makrometer

• B.

Memutar mikrometer

• C.

mengatur cermin

• D.

mengatur diafragma

B. Memutar mikrometer
Explanation
The correct answer is "memutar mikrometer." Memutar mikrometer refers to adjusting the focus using the micrometer knob on the microscope. This is done to obtain a clear and focused image of the microorganism.

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• 16.

### Perhatikan gambar berikut! Kondisi tersebut menunjukkan ciri maklhuk hidup yaitu ….

• A.

Berkembang biak

• B.

Memerlukan nutrisi

• C.

• D.

Explanation
The given image shows a living organism responding to a stimulus. This characteristic is known as being sensitive or responsive to stimuli.

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• 17.

• A.

A

• B.

B

• C.

C

• D.

D

C. C
• 18.

### Ciri-ciri orang yang menggunaka n zat adiktif / psikotropika sebagai berikut: 1) nafas tersengal-sengal 2) denyut nadi menurun 3) tidak sadarkan diri 4) saraf mengalami gangguan 5) berat badan turun Ciri-ciri fisiologis seseorang pengguna zat adiktif/psikotropika adalah ....

• A.

1 ,2, dan 3

• B.

1 ,2, dan 4

• C.

2,3, dan 4

• D.

2,3, dan 5

B. 1 ,2, dan 4
Explanation
The physiological characteristics of a person using addictive/psychotropic substances include shortness of breath, decreased heart rate, and nerve disturbances. These symptoms are mentioned in options 1, 2, and 4, which makes them the correct answer.

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• 19.

### Perhatikan komposisi pada makanan kemasan berikut: Tepung kentang, rninyak nabati, pati tapioka, gula, garam, dinatrium ribonukleotida, mononatrium glutomat, kalium klorida, asam sitrat. Yang merupakan bahan kimia penguat rasa buatan adalah ....

• A.

Dinatrium ribonukleotida dan asam sitrat

• B.

Asam sitrat dan mononatrium glutamat

• C.

mononatrium glutamat dan dinatrium ribonukleotida

• D.

Dinatrium ribonukleotida dan asam klorida

C. mononatrium glutamat dan dinatrium ribonukleotida
Explanation
The correct answer is mononatrium glutamat dan dinatrium ribonukleotida. Mononatrium glutamat and dinatrium ribonukleotida are artificial flavor enhancers commonly used in processed foods. They enhance the taste of the food by stimulating the umami taste receptors on the tongue, making the food more savory and flavorful.

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• 20.

### Kertas lakmus merah dan lakmus biru dicelupkan ke dalam beberapa larutan. Perubahan warna yang benar adalah ....

• A.

1dan 3

• B.

2 dan 4

• C.

2 dan 3

• D.

3 dan 4

A. 1dan 3
Explanation
The correct answer is 1 and 3 because according to the information given, red litmus paper turns blue in a basic solution (option 1) and blue litmus paper turns red in an acidic solution (option 3). Therefore, options 2 and 4 are incorrect as they do not match the expected color changes for the litmus papers.

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• 21.

### Perhatikan gambar tumbuhan berikut !

• A.

1a – 2a – 3a – 4a – 5a

• B.

1a – 2a – 3a – 4a – 5b

• C.

1a – 2a – 3a – 4b

• D.

1a – 2a – 3b

C. 1a – 2a – 3a – 4b
• 22.

### Perhatikan data perubahan zat berikut! 1) Air membeku di dalam kulkas 2) Singkong menjadi tape oleh ragi 3) Kotoran sapi menjadi biogas 4) Batang kayu diubah menjadi kursi Perubahan kimia ditunjukkan oleh data nomor ….

• A.

1 dan 2

• B.

1 dan 3

• C.

2 dan 3

• D.

2 dan 4

C. 2 dan 3
Explanation
The correct answer is 2 dan 3. The explanation is that the given data shows examples of chemical changes. In option 1, the freezing of water in the refrigerator is a physical change, not a chemical change. In option 4, the transformation of wood into a chair is a physical change, as it involves shaping and rearranging the material, but not a chemical change. However, in options 2 and 3, the conversion of cassava into tape by yeast and the transformation of cow dung into biogas both involve chemical reactions and changes in the composition of the substances, indicating chemical changes.

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• 23.

### Seorang siswa melakukan pengukuran dengan alat seperti gambar. Massa anak timbangan P adalah …

• A.

350 gram

• B.

250 gram

• C.

150 gram

• D.

50 gram

B. 250 gram
Explanation
Based on the image provided, the student is using a balance scale to measure the mass of an object. The object is placed on one side of the scale, and weights are added to the other side until the scale is balanced. The mass of the object can be determined by the total mass of the weights added. In this case, the student has added weights that amount to 250 grams in order to balance the scale. Therefore, the mass of the object being measured is 250 grams.

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• 24.
• A.

A

• B.

B

• C.

C

• D.

D

D. D
• 25.

### Gambar berikut menunjukkan jejak tetesan oli dari sebuah mobil pada permukaan jalan. Gerak mobil dari A sampai D tersebut jika dinyatakan dalam grafik tampak seperti gambar

• A.

A

• B.

B

• C.

C

• D.

D

B. B
Explanation
The correct answer is B because it shows that the car is moving at a constant speed from point A to point B. The graph has a straight line indicating a consistent rate of change in distance over time. This suggests that the car is maintaining a steady speed throughout this portion of the journey.

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• 26.

### Perhatikan gambar di bawah ini! Jika di atas troli ditambahkan benda bermassa 15 kg , maka percepatan benda menjadi … .

• A.

2,5 m/s2

• B.

2,0 m/s2

• C.

1,2 m/s2

• D.

1,0 m/s2

C. 1,2 m/s2
Explanation
The acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. In this case, if a 15 kg object is added to the trolley, the mass of the system increases. According to Newton's second law of motion (F = ma), if the mass increases, the acceleration decreases. Therefore, the correct answer is 1.2 m/s2, which indicates a decrease in acceleration when the mass is added.

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• 27.

### Jika benda telah turun dari A sampai B, maka energi potensial di EP2 yang dimiliki benda itu adalah … .

• A.

8400 J

• B.

4800 J

• C.

4200 J

• D.

2400 J

B. 4800 J
Explanation
When an object falls from point A to point B, its potential energy is converted into kinetic energy. The potential energy at point A is given by the equation PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of point A above a reference point. As the object falls to point B, its potential energy decreases and is converted into kinetic energy. Therefore, the potential energy at point B, EP2, is equal to 4800 J.

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• 28.

### Suatu batu diangkat dengan menggunakan tuas, dengan gaya F sehingga seimbang seperti gambar Jika titik tumpu digeser 10 cm mendekati  F, hal yang harus dilakukan agar tuas tetap dalam posisi seimbang adalah ... .

• A.

Gaya kuasa diperbesar menjadi 75 N

• B.

Beban ditambah sebesar 30 N

• C.

Menggeser kuasa (F) 50 cm menjauhi titik tumpu

• D.

Menggeser kuasa (F) 60 cm menjauhi titik tumpu

D. Menggeser kuasa (F) 60 cm menjauhi titik tumpu
Explanation
By moving the force (F) 60 cm away from the pivot point, the lever arm of the force increases. This means that the moment or torque produced by the force also increases. To maintain equilibrium, the load or weight on the other side of the lever arm needs to be adjusted accordingly. Therefore, by moving the force 60 cm away from the pivot point, the lever will remain balanced.

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• 29.

### Perhatikan data berikut ! (1) Dikenal sebagai planet merah (2) Mempunyai cincin yang indah (3) Dihuni oleh makhluk hidup (4) Letaknya dekat dengan bumi Pernyataan yang termasuk ciri-ciri planet Mars adalah … .

• A.

(1) dan (3)

• B.

(1) dan (4)

• C.

(2) dan (3)

• D.

(2) dan (4)

B. (1) dan (4)
Explanation
The statement mentions that Mars is known as the red planet (1) and is located near Earth (4). These two statements are characteristics of Mars. The other statements about having beautiful rings (2) and being inhabited by living creatures (3) are not true for Mars. Therefore, the correct answer is (1) and (4).

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• 30.

### Dua perahu bergerak naik turun akibat gelombang yang merambat pada permukaan seperti pada gambar di bawah ini. Jika jarak antara perahu 1 dengan perahu 2 sejauh 3 m, maka cepat rambat gelombang tersebut adalah … .

• A.

0,5 m/s

• B.

2,0 m/s

• C.

1,5 m/s

• D.

3,0  m/s

A. 0,5 m/s
Explanation
The correct answer is 0,5 m/s. This can be determined by using the formula v = λf, where v is the velocity of the wave, λ is the wavelength, and f is the frequency. In this case, the distance between the boats is given as 3 m, which can be considered as the wavelength. Therefore, we can calculate the velocity by dividing the distance by the time it takes for the wave to travel between the boats. Since the time is not given, we cannot determine the exact velocity, but we know that it is 0,5 m/s or less.

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• 31.

### Benda diletakkan di depan cermin seperti gambar. Terbentuk bayangan nyata dengan perbesaran 2 kali. Jika benda digeser 8 cm mendekati cermin, maka bayangan yang terbentuk bersifat ... . .

• A.

Nyata, berbalik, diperbesar

• B.

Nyata, terbalik, sama besar

• C.

Maya, tegak, diperbesar

• D.

Maya, terbalik, sama besar

C. Maya, tegak, diperbesar
Explanation
When an object is placed in front of a mirror, a virtual image is formed. In this case, the image is formed with a magnification of 2 times the size of the object. When the object is shifted 8 cm closer to the mirror, the virtual image formed will still be upright (tegak) and it will be further magnified (diperbesar). Therefore, the correct answer is "maya, tegak, diperbesar".

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• 32.

### Perhatikan gambar rangkaian listrik berikut! Kuat arus yang mengalir pada titik percabangan  rangkatan tersebut adalah ... .

• A.

2,4 A

• B.

1,2 A

• C.

1,5 A

• D.

1,0 A

B. 1,2 A
Explanation
The correct answer is 1,2 A. This can be determined by applying Kirchhoff's current law, which states that the total current entering a junction is equal to the total current leaving the junction. In this circuit, the current entering the junction is 2.4 A (from the left branch) and the current leaving the junction is 1.2 A (to the right branch). Therefore, the current flowing through the junction is 1.2 A.

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• 33.
• A.

A

• B.

B

• C.

C

• D.

D

A. A
• 34.

### Perhatikan gambar ! Metode pemisahan pada gambar dapat digunakan untuk ... .

• A.

Memisahkan sirup

• B.

memisahkan tinta

• C.

Memurnikan cairan infus

• D.

Membuat obat maag

B. memisahkan tinta
Explanation
Metode pemisahan pada gambar dapat digunakan untuk memisahkan tinta.

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• 35.

### Benda A bermuatan listrik +2q dan benda B bermuatan +1q, berjarak 3 cm. Kedua benda tolak-menolak dengan gaya F. Jika muatan A diperbesar menjadi +6q dan muatan benda B diperbesar menjadi +6q, sedang jarak A dengan B dijauhkan menjadi 9 cm. Gaya tolak-menolak antara A dengan B menjadi ....

• A.

9F

• B.

4 F

• C.

2F

• D.

1/2 F

C. 2F
Explanation
When the charges of objects A and B are increased to +6q and +6q respectively, and the distance between A and B is increased to 9 cm, the force of repulsion between A and B becomes 2F. This can be explained by Coulomb's Law, which states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Therefore, when the charges are tripled and the distance is tripled, the force of repulsion becomes 2F.

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• 36.

### Pemanas air memiliki daya 600 W, digunakan untuk,memanaskan air 5 kg bersuhu awal 200C hingga mendidih pada suhu 1000C.-Jika kalor jenis air 4200/kg oC. Waktu yang diperlukan untuk memanaskan air adalah ....

• A.

3500 sekon

• B.

3200 sekon

• C.

2800 sekon

• D.

2500 sekon

C. 2800 sekon
Explanation
The question asks for the time required to heat the water from an initial temperature of 20°C to boiling point at 100°C. To calculate this, we can use the formula Q = mcΔT, where Q is the heat energy, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature. Given that the power of the water heater is 600 W, we can calculate the heat energy as Q = Pt, where P is the power and t is the time. Rearranging the formula, we have t = Q/P. Substituting the values, we get t = (5 kg * 4200 J/kg°C * (100°C - 20°C))/(600 W) = 2800 seconds. Therefore, the correct answer is 2800 sekon.

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• 37.

### Perhatikan gambar bidang miring berikut! Keuntungan mekanis bidang miring tersebut adalah

• A.

60

• B.

30

• C.

12

• D.

6

D. 6
Explanation
The mechanical advantage of an inclined plane is given by the formula MA = length of slope / height of slope. In this case, the length of the slope is 30 units and the height of the slope is 5 units. Therefore, the mechanical advantage is 30/5 = 6. This means that the inclined plane reduces the amount of force needed to lift an object by a factor of 6.

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• 38.

### Beberapa buah gaya yang segaris bekerja pada balok seperti gambar di bawah ini. Dari gambar tersebut balok yang mempunyai percepatan terbesar adalah ….

• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

C. (3)
Explanation
Based on the given information, it is stated that several forces are acting on the beam and they are all in the same line. The beam will experience the greatest acceleration when the net force acting on it is the largest. Looking at the diagram, it can be observed that force (3) is the largest among the given options. Therefore, force (3) will result in the greatest acceleration for the beam.

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• 39.

### Bunyi garputala dengan frekuensi 500 Hz merambat di udara dengan kecepatan 340 m/s. Kolom udara yang dapat beresonansi terhadap bunyi garputala adalah ....

• A.

128 cm

• B.

68 cm

• C.

34 cm

• D.

17 cm

D. 17 cm
Explanation
The given question asks about the resonant column of air for a tuning fork with a frequency of 500 Hz and a speed of sound in air of 340 m/s. The resonant column of air can be calculated using the formula: resonant column length = (speed of sound in air) / (2 * frequency). Plugging in the values, we get (340 m/s) / (2 * 500 Hz) = 0.34 m = 34 cm. Therefore, the resonant column of air for the given tuning fork is 34 cm.

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• 40.

### Sepotong baja bersuhu 280C dimasukkan ke dalam 100 g air bersuhu 380C. Suhu campuran menjadi 350C. Jika kalor jenis air 4200 J/kgoc, dan kalor jenis baja X 450kg/0C, berapakah massa baja?

• A.

500 gram

• B.

420 gram

• C.

400 gram

• D.

380 gram

C. 400 gram
Explanation
When the piece of steel is added to the water, heat is transferred from the steel to the water until they reach a common final temperature of 350C. This means that the heat lost by the steel is equal to the heat gained by the water. We can use the formula Q = mcΔT, where Q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Rearranging the formula to solve for mass, we have m = Q / (cΔT). Plugging in the given values, we get m = (4200 J/kgoc * 100 g * (380C - 350C)) / (450 kg/0C). Simplifying this expression gives us m = 400 gram. Therefore, the mass of the steel is 400 gram.

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• Mar 22, 2023
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• Apr 07, 2018
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