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SOAL OSN IPA PART 2

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

An echo sounder produces ultrasound of frequency. The ultrasound travels in water at a speed of 1.5 km/s.

What is the wavelength in water of ultrasound of this frequency?

a)

16 m

b)

0.063 m

c)

63 m

d)

36 m

2.

A lump of metal has a mass of 210 g. It is lowered into a measuring cylinder containing water. The level of the water rises from 35 cm3cm^3 to 140 cm3cm^3 .

What is the density of the metal?

a)

0.67 g/ cm3cm^3

b)

2.0 g/ cm3cm^3

c)

1.5 g/ cm3cm^3

d)

6.0 g/ cm3cm^3

3.

A javelin has a mass of 0.80 kg.

The javelin is released with 250 J of kinetic energy.

What is the speed of the jevelin?

a)

630 m/s

b)

25 m/s

c)

18 m/s

d)

13 m/s

4.

Pada gambar di samping ini urutan perubahan energi adalah ..........

a)

Energi listrik - energi kimia - energi kalor

b)

Energi kimia - energi listrik - energi kalor

c)

Energi listrik - energi kimia - energi cahaya

d)

Energi kimia - energi listrik - energi cahaya

5.

Sebuah rumah menggunakan 4 lampu pijar 25 W selama 10 jam/hari, sebuah TV 50 W dipakai selama 10 jam/hari. Sebuah setrika 300 W selama 4 jam/minggu. Jika 1 Kwh tarifnya Rp 300,00 dan biaya beban listriknya sebesar Rp 2000,00 /bulan. Biaya rekening listrik yang seharusnya di bayar setiap bulan (30 hari) adalah ...............

a)

Rp 22.490,00

b)

Rp 20.490,00

c)

Rp 16.940,00

d)

Rp 14.940,00

6.

Perhatikan gambar berikut ini!

Dari gambar diatas, jika waktu yang dibutuhkan bandul bergerak dari A dampai ke C 0,4 sekon, maka besar frekuensi getaran yang dihasilkan adalah ..............

a)

0,20 Hz

b)

1,25 Hz

c)

2,00 Hz

d)

0,80 Hz

7.

Energi from petrol is used to operate an engine. The engine drives a generator, which produces electrical energy.

What is the overall efficiency of the process?

a)

25%

b)

30%

c)

55%

d)

83%

8.

A loundspeaker produces a sound wave of frequency 50 Hz. The amplitude of the sound wave is increased.

What is heard?

a)

a louder sound of a higher pitch

b)

a louder sound of the same pitch

c)

sound of a higher pitch but the same loudness

d)

sound of the same pitch and loudness as before

9.

The diagram shows a circuit.

Which sircuit diagram shows this circuit?

a)

b)

c)

d)

10.

Which list gives the astronomical objects in order of size, starting with the largets?

a)

planet-galaxy-solar system-Sun

b)

planet-solar system-Sun-galaxy

c)

galaxy-solar system-planet-Sun

d)

galaxy-solar system-Sun-planet