Earth’s Magnetism & Magnetic Materials MCQs
Earth’s Magnetism & Magnetic Materials – MCQs
Class: 12 | Subject: Physics |
Section: Magnetic Effects of Current & Magnetism |
Topic: Earth’s Magnetism & Magnetic Materials
Based on: NCERT Syllabus | CBSE Board Examination Standard
Based on: NCERT Syllabus | CBSE Board Examination Standard
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 12 Board Examination preparation.
1. Earth behaves like a:
Answer: C
Earth produces a magnetic field similar to a giant bar magnet.
Earth produces a magnetic field similar to a giant bar magnet.
2. Angle between magnetic and geographic meridian:
Answer: B
Magnetic declination defines this angular difference.
Magnetic declination defines this angular difference.
3. Magnetic inclination at equator:
Answer: A
Field is horizontal at equator.
Field is horizontal at equator.
4. Inclination at magnetic poles:
Answer: D
Field is vertical.
Field is vertical.
5. Neutral point occurs where:
Answer: A
Resultant magnetic field becomes zero.
Resultant magnetic field becomes zero.
6. Horizontal component strongest at:
Answer: B
Maximum horizontal field.
Maximum horizontal field.
7. Vertical component zero at:
Answer: B
Field horizontal.
Field horizontal.
8. Diamagnetic substances are:
Answer: B
χ negative.
χ negative.
9. Paramagnetic substances:
Answer: A
Small positive χ.
Small positive χ.
10. Ferromagnetic example:
Answer: B
Strong domain alignment.
Strong domain alignment.
11. Retentivity means:
Answer: B
Ability to retain magnetization.
Ability to retain magnetization.
12. Coercivity is:
Answer: B
Opposes magnetization.
Opposes magnetization.
13. Soft iron used for:
Answer: B
Low retentivity.
Low retentivity.
14. Hard steel used for:
Answer: B
High coercivity.
High coercivity.
15. Hysteresis loop area shows:
Answer: A
Heat loss in magnetization cycle.
Heat loss in magnetization cycle.
16. Magnetic permeability unit:
Answer: A
Henri per metre.
Henri per metre.
17. Declination varies with:
Answer: C
Earth field changes.
Earth field changes.
18. Compass needle aligns with:
Answer: B
Along Earth’s magnetic field.
Along Earth’s magnetic field.
19. Earth’s field strength unit:
Answer: C
1 T = 10⁴ gauss.
1 T = 10⁴ gauss.
20. Diamagnetic susceptibility is:
Answer: C
Weakly repelled.
Weakly repelled.
