Uji Coba Pra Un IPA Smp Kota Padang Februari 2016

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• 1.

• A.

1000

• B.

2000

• C.

3000

• D.

4000

B. 2000
• 2.

Berikut ini gambar bimetal terbuat dari logam A dan B.

• A.

Koefisien muai panjang logam A lebih kecil dari logam B

• B.

Koefisien muai panjang logam B lebih kecil dari logam A

• C.

Bimetal akan melengkung ke arah logam B bila didinginkan.

• D.

Koefisien muai volume logam B lebih kecil dari logam A

B. Koefisien muai panjang logam B lebih kecil dari logam A
Explanation
The correct answer is "koefisien muai panjang logam B lebih kecil dari logam A." This means that the coefficient of linear expansion of metal B is smaller than that of metal A. This implies that metal B will contract less than metal A when cooled, causing the bimetal to curve towards metal B.

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• 3.

• A.

1000 Pa

• B.

2000 Pa

• C.

10.000 Pa

• D.

20.000 Pa

D. 20.000 Pa
• 4.

Dua buah gaya bekerja pada sebuah benda sehingga berpindah seperti gambar berikut ini. Jika usaha yang dilakukan oleh F1 dan F2 sebesar 200 Joule, maka besar…..

• A.

Gaya F1 = 60 N ; Gaya F2 = 80 N

• B.

Gaya F1 = 20 N ; Gaya F2 = 40 N

• C.

Gaya F1 = 80 N ; Gaya F2 = 60 N

• D.

Gaya F1 = 100 N ; Gaya F2 = 120 N

C. Gaya F1 = 80 N ; Gaya F2 = 60 N
Explanation
The correct answer is Gaya F1 = 80 N ; Gaya F2 = 60 N. This is because the total work done on the object is 200 Joule. The work done by a force is calculated by multiplying the force applied by the distance over which the force is applied. Since the work done by F1 and F2 is equal to 200 Joule, it means that the work done by F1 plus the work done by F2 is equal to 200 Joule. Therefore, the forces F1 and F2 must have magnitudes that result in a total work of 200 Joule.

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• 5.

C.
• 6.

Bandul bergerak dari R ke Q memerlukan waktu  1/5 sekon.  Frekuensi bandul adalah….

• A.

5,0 Hz

• B.

4/5 Hz

• C.

5/4 Hz

• D.

1/5 Hz

C. 5/4 Hz
Explanation
The bandul's movement from R to Q takes 1/5 second. The frequency of a pendulum is the number of complete oscillations it makes in one second. Since the bandul takes 1/5 second to complete one oscillation, the frequency can be calculated by taking the reciprocal of the time, which is 5/1 or simply 5. However, the answer options are in terms of Hz, which represents oscillations per second. So, the frequency is 5/1 Hz, which simplifies to 5 Hz. Therefore, the correct answer is 5 Hz.

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• 7.

Perhatikan gambar gelombang berikut ini. Cepat rambat gelombang adalah….

• A.

5,0 m/s

• B.

25 m/s

• C.

12,5 m/s

• D.

50 m/s

C. 12,5 m/s
Explanation
The correct answer is 12,5 m/s. The question asks for the wave propagation speed. In physics, wave propagation speed refers to the speed at which a wave travels through a medium. It is determined by the properties of the medium, such as its density and elasticity. The given options represent different values for the wave propagation speed. Out of these options, 12,5 m/s is the correct answer as it represents the most appropriate value for the wave propagation speed based on the given information.

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• 8.

Sebuah kapal laut memancarkan ultrasonik kedasar laut dan diterima kembali setelah 3 sekon. Cepat rambat bunyi dalam air 1500 m/s. Kedalaman laut adalah….

• A.

500 m

• B.

2250 m

• C.

1750 m

• D.

4500 m

B. 2250 m
Explanation
The time it takes for the ultrasonic signal to travel to the bottom of the sea and back is 3 seconds. The speed of sound in water is 1500 m/s. To find the depth of the sea, we can use the formula distance = speed x time. Therefore, the depth of the sea is 1500 m/s x 3 s = 4500 m. So, the correct answer is 4500 m.

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• 9.

Sebuah benda berada 30 cm di depan cermin cekung dengan jari – jari 80 cm. Perbesaran  bayangan dari cermin adalah….

• A.

2 kali

• B.

4 kali

• C.

6 kali

• D.

8 kali

B. 4 kali
Explanation
The correct answer is 4 times. This is because a concave mirror with a radius of curvature of 80 cm will produce a magnification of -1. The negative sign indicates that the image is inverted. The magnification formula is given by M = -d_i/d_o, where M is the magnification, d_i is the image distance, and d_o is the object distance. In this case, the object distance is 30 cm. Thus, the image distance can be calculated as -80 cm = 4 * 30 cm. Therefore, the magnification is 4 times.

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• 10.

Perhatikan gambar benda di depan lensa berikut ini. Jarak fokus lensa adalah….

• A.

80 cm

• B.

60 cm

• C.

40 cm

• D.

20 cm

D. 20 cm
Explanation
The correct answer is 20 cm. This means that the focal length of the lens is 20 cm. The focal length of a lens is the distance between the lens and the point where parallel rays of light converge or diverge. In this case, the lens is able to converge the parallel rays of light at a distance of 20 cm from the lens.

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• 11.

Perhatikan jalannya sinar pada mata sebelum dan sesudah pakai kaca mata berikut. Jenis cacat mata dan penyebab terjadinya adalah,....

• A.

Hipermetropi ; Titik dekat mata bergeser menjauhi mata

• B.

Hipermetropi ; Titik dekat mata bergeser mendekati mata

• C.

Miopi ; Titik jauh mata bergeser menjauhi mata

• D.

Miopi ; Titik jauh mata bergeser mendekati mata.

D. Miopi ; Titik jauh mata bergeser mendekati mata.
Explanation
The correct answer is "Miopi ; Titik jauh mata bergeser mendekati mata." This means that the condition being described is myopia, also known as nearsightedness. In myopia, the point of focus for the eyes is shifted closer to the eyes, causing distant objects to appear blurry. This is why the statement says that the point of focus for faraway objects (titik jauh mata) moves closer to the eyes (bergeser mendekati mata).

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• 12.

Sebuah sisir plastik digosok dengan kain wol. Pernyataan yang benar adalah….

• A.

Elektron dari sisir pindah ke kain wol, sisir menjadi bermuatan negatif.

• B.

Proton dari sisir pindah ke kain wol, sisir menjadi bermuatan negatif.

• C.

Elektron dari wol pindah ke sisir plastik, sisir plastik menjadi bermuatan negatif.

• D.

Proton dari wol pindah ke sisir plastik, sisir plastik menjadi bermuatan positif.

C. Elektron dari wol pindah ke sisir plastik, sisir plastik menjadi bermuatan negatif.
Explanation
When a plastic comb is rubbed with wool, electrons from the wool are transferred to the plastic comb. This causes the plastic comb to become negatively charged.

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• 13.

• A.

0,5 A

• B.

1,0 A

• C.

1,5 A

• D.

2,0 A

D. 2,0 A
• 14.

Perhatikan tabel peralatan listrik di sebuah rumah berikut ini. Jika tarif listrik per kWh = Rp 500,00 maka biaya pemakaian listrik selama bulan April 2013 adalah...

• A.

Rp 214.500,00

• B.

Rp 215.400,00

• C.

Rp 245.100,00

• D.

Rp 415.200,00

A. Rp 214.500,00
Explanation
The correct answer is Rp 214.500,00 because to calculate the total electricity usage cost, we need to multiply the total kWh consumed by the tariff per kWh. Since the total kWh consumed is not given, we cannot calculate the exact cost. Therefore, any explanation provided would be speculative.

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• 15.

Perbandingan lilitan suatu transformator adalah 11 : 2 , dan tegangan keluaran transformator  220 volt. Tegangan masukan  adalah....

• A.

440 Volt

• B.

40 Volt

• C.

1210 Volt

• D.

121 Volt

C. 1210 Volt
Explanation
The given information states that the turns ratio of the transformer is 11:2 and the output voltage is 220 volts. The turns ratio is defined as the ratio of the number of turns in the primary coil to the number of turns in the secondary coil. In this case, the primary coil has 11 turns and the secondary coil has 2 turns. To find the input voltage, we can use the formula:

(Input voltage) / (Output voltage) = (Number of turns in primary coil) / (Number of turns in secondary coil)

Plugging in the given values, we get:

(Input voltage) / 220 = 11 / 2

Cross multiplying, we find:

(Input voltage) = (220 * 11) / 2 = 1210 volts

Therefore, the input voltage is 1210 volts.

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• 16.

Sebuah bola lampu dengan hambatan 10 ohm dialiri arus listrik selama 10 menit. Energi yang diserap lampu  adalah 24.000 Joule. Besar kuat arus adalah...

• A.

1 A

• B.

2 A

• C.

3 A

• D.

4 A

B. 2 A
Explanation
The energy absorbed by the lamp can be calculated using the formula: E = P * t, where E is the energy, P is the power, and t is the time. Rearranging the formula to solve for power, we get P = E / t. Given that the energy absorbed is 24,000 Joules and the time is 10 minutes (or 600 seconds), we can substitute these values into the formula to find the power. P = 24,000 J / 600 s = 40 W. Using Ohm's Law, we can find the current by dividing the power by the resistance. I = P / R = 40 W / 10 Ω = 4 A. Therefore, the correct answer is 4 A.

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• 17.

Perhatikan gambar susunan anggota Tatasurya berikut ! Asteroid merupakan planet kecil-planet kecil yang mengorbit di antara orbit planet yang bernomor ….

• A.

( 1 ) dan ( 2 )

• B.

( 3 ) dan ( 4 )

• C.

( 2 ) dan ( 3 )

• D.

( 4 ) dan ( 5 )

D. ( 4 ) dan ( 5 )
• 18.

Perhatikan gambar bulan mengelilingi bumi dan bersama-sama beredar mengelilingi matahari berikut ! Jika (1), (2), dan (3) berturut-turut adalah matahari, bumi, dan bulan, maka akibat pengaruh gaya gravitasi bulan dan matahari terhadap bumi, di daerah berikut air lautnya mengalami ….

• A.

Pasang di A dan D // Surut di B dan C

• B.

Pasang di B dan D // Surut di A dan C

• C.

Pasang di A dan B // Surut di D dan C

• D.

Pasang di A dan B // Surut di B dan D

B. Pasang di B dan D // Surut di A dan C
Explanation
The correct answer is "Pasang di B dan D // Surut di A dan C". This is because the gravitational force of the moon and the sun causes the tides on Earth. When the moon is directly overhead or on the opposite side of the Earth (positions B and D), the gravitational pull is strongest, causing high tides. On the other hand, when the moon is at positions A and C, the gravitational pull is weaker, resulting in low tides. Therefore, the tides are high at B and D and low at A and C.

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• 19.

Perhatikan sederetan benda-benda bermuatan listrik yang digantung dengan benang berikut ! Jika benda C bermuatan listrik positif, maka berturut-turut benda A, B, D, dan E bermuatan listrik ....

• A.

Positif, negatif, positif, dan positif

• B.

Negatif, positif, negatif, dan negatif

• C.

Negatif, negatif, positif, dan positif

• D.

Positif, positif, negatif, dan negatif

B. Negatif, positif, negatif, dan negatif
Explanation
The given correct answer states that if object C is positively charged, then objects A, B, D, and E will be negatively charged, positively charged, negatively charged, and negatively charged respectively. This can be explained by the principle of electrical charge. Like charges repel each other, so if object C is positively charged, it will repel the positive charges of objects A and E, causing them to become negatively charged. Similarly, object C will attract the negative charges of objects B and D, causing them to become positively charged. Hence, the sequence of charges will be negative, positive, negative, and negative.

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• 20.

Lilin dengan tinggi 4 cm terletak didepan cermin cekung pada jarak 20 cm. Jika jari - jari cermin 30 cm, letak bayangan yang dihasilkan adalah….

• A.

60 cm di depan cermin

• B.

60 cm di belakang cermin

• C.

30 cm di depan cermin

• D.

30 cm di belakang cermin.

A. 60 cm di depan cermin
Explanation
When an object is placed in front of a concave mirror, the image formed can be either real or virtual. In this case, the object (candle) is located in front of the mirror at a distance of 20 cm. The radius of curvature of the mirror is given as 30 cm. Since the object is placed beyond the focal point (which is half the radius of curvature), a real and inverted image is formed. According to the mirror formula, 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance. Solving for v, we find that the image distance is 60 cm. Since the image distance is positive, the image is formed in front of the mirror, hence the correct answer is "60 cm di depan cermin" (60 cm in front of the mirror).

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• Current Version
• Mar 20, 2023
Quiz Edited by
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• Apr 05, 2013
Quiz Created by
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