7th grade electricity and magnetism
7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS2-3, NGSS.HS-PS2-5 · England: KS3 Physics: Electricity and electromagnetism (magnetism), KS4 Combined Science: Magnetism and electromagnetism
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Date
Score/ 16
Question 1
Electromagnets: which statement is NOT true?
- A. A copper core makes an electromagnet much stronger.
- B. Increasing the current makes an electromagnet stronger.
- C. Electromagnets are used in electric bells, speakers and motors.
- D. An electromagnet only works when a current flows.
Question 2
A wire carrying a current has…
- A. a magnetic field around it
- B. a static charge
- C. no effect on a compass
- D. a gravitational field only
Question 3
An electromagnet picked up these numbers of paper clips: 5 turns: 2 clips 10 turns: 4 clips 15 turns: 6 clips 20 turns: 8 clips If the pattern continues, how many clips would 30 turns pick up?
Answer
Question 4
Electromagnets: which statement is NOT true?
- A. An electromagnet only works when a current flows.
- B. Increasing the current makes an electromagnet stronger.
- C. An electromagnet stays magnetic forever after it is switched off.
- D. Electromagnets are used in electric bells, speakers and motors.
Question 5
What core material makes an electromagnet strongest?
- A. plastic
- B. iron
- C. copper
- D. wood
Question 6
An electromagnet picked up these numbers of paper clips: 10 turns: 4 clips 20 turns: 8 clips 30 turns: 12 clips 40 turns: 16 clips If the pattern continues, how many clips would 50 turns pick up?
Answer
Question 7
Electromagnets: which statement is NOT true?
- A. An electromagnet only works when a current flows.
- B. Electromagnets can pick up aluminium cans.
- C. Increasing the current makes an electromagnet stronger.
- D. Electromagnets are used in electric bells, speakers and motors.
Question 8
A wire carrying a current has…
- A. a magnetic field around it
- B. a static charge
- C. a gravitational field only
- D. no effect on a compass
Question 9
An electromagnet picked up these numbers of paper clips: 5 turns: 2 clips 10 turns: 4 clips 15 turns: 6 clips 20 turns: 8 clips If the pattern continues, how many clips would 30 turns pick up?
Answer
Question 10
Electromagnets: which statement is NOT true?
- A. An electromagnet only works when a current flows.
- B. A copper core makes an electromagnet much stronger.
- C. The magnetic field of a coil is like that of a bar magnet.
- D. Increasing the current makes an electromagnet stronger.
Question 11
What core material makes an electromagnet strongest?
- A. iron
- B. plastic
- C. copper
- D. wood
Question 12
An electromagnet picked up these numbers of paper clips: 10 turns: 2 clips 20 turns: 4 clips 30 turns: 6 clips 40 turns: 8 clips If the pattern continues, how many clips would 50 turns pick up?
Answer
Question 13
Electromagnets: which statement is NOT true?
- A. Electromagnets can pick up aluminium cans.
- B. An electromagnet only works when a current flows.
- C. Increasing the current makes an electromagnet stronger.
- D. The magnetic field of a coil is like that of a bar magnet.
Question 14
Why is an electromagnet useful in a scrapyard crane?
- A. It can be switched off to drop the iron and steel
- B. It is always on
- C. It picks up all metals including aluminium
- D. It never needs electricity
Question 15
An electromagnet picked up these numbers of paper clips: 5 turns: 3 clips 10 turns: 6 clips 15 turns: 9 clips 20 turns: 12 clips If the pattern continues, how many clips would 30 turns pick up?
Answer
Question 16
Electromagnets: which statement is NOT true?
- A. Increasing the current makes an electromagnet stronger.
- B. Electromagnets are used in electric bells, speakers and motors.
- C. Electromagnets can pick up aluminium cans.
- D. An electromagnet only works when a current flows.
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