UH MAGNET
Quiz
•
Science
•
9th Grade
•
Practice Problem
•
Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Berikut perlakuan pada magnet:
1) dipukul-pukul
2) direndam ke dalam air
3) dialiri listrik bolak - balik
4) dilapisi cat
5) dibakar
Perlakuan yang dapat menghilangkan kemagnetan sebuah magnet adalah ....
a. 1,3,5
b.1,2,4
c.2,4,5
d.1,4,5
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Hewan berikut yang memanfaatkan kemagnetan bumi untuk melakukan navigasi adalah ...
a. nyamuk
b.gurita
c.cumi-cumi
d.bakteri
3.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Peralatan berikut yang memanfaatkan prinsip elektromagnetik adalah ...
A. AC
B. KIPAS ANGIN
C. JAM TANGAN
D. KERETA CEPAT
4.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Pernyataan berikut yang sesuai dengan prinsip pembuatan magnet adalah …
a. Mengubah susunan magnet elementer dari yang semula acak menajadi searah
b.Mengubah susunan magnet elementer dari yang semula acak menajadi berlawanan arah
c.Mengubah susunan magnet elementer dari yang semula searah menajadi acak
d.Mengubah susunan magnet elementer dari yang semula searah menajadi berlawanan arah
5.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Sebuah kawat penghantar panjangnya 4 m berada dalam medan magnet. Kawat mengalami gaya Lorentz sebesar 6 N, karena kawat telah dialiri arus sebesar 0,4 A. Jika kawat dipotong setengahnya dan dialiri arus 1,2 A, maka besarnya gaya Lorentz adalah . . . .
A.39N
B.29N
C.19N
D.9N
6.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Seutas kawat yang panjangnya 3 m berada dalam medan magnet 5 Tesla. Kawat mengalami gaya Lorentz sebesar 30 N, maka besarnya arus listrik yang mengalir adalah …
A. 6 A
B. 4 A
C. 2 A
D. 1 A
7.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Berapakah efisiensi transformator jika daya masukan 300 W dan daya keluaran 250 W?
A. 8,3%
B.83%
C.0,83%
D.18,3%
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