Daily Practice Problems

Class 12 · Physics

Ch 5 — Magnetism and Matter

📅 30 July 2026 ✎ 5 Questions ⏰ 10 minutes

Assertion (A): Magnetic field lines form continuous closed loops.
Reason (R): Isolated magnetic monopoles do not exist.

Choose the correct option:

A. Both A and R are true, and R is the correct explanation of A B. Both A and R are true, but R is NOT the correct explanation of A C. A is true, but R is false D. A is false, but R is true

📝 SolutionBecause monopoles don't exist, field lines cannot begin or end at a point and must form closed loops. R correctly explains A.

The Earth behaves like a giant:

A. capacitor B. bar magnet C. resistor D. battery

📝 SolutionThe Earth has a magnetic field similar to that of a huge bar magnet tilted with respect to its axis.

Soft iron is used to make electromagnets because it:

A. retains magnetism permanently B. loses magnetism easily when current stops C. cannot be magnetised D. is diamagnetic

📝 SolutionSoft iron gets strongly magnetised but loses magnetism as soon as the current is switched off, making it ideal for electromagnets.

The angle between the geographic and magnetic meridian is called the:

A. dip B. declination C. inclination D. azimuth

📝 SolutionMagnetic declination is the angle between the geographic (true) north and the magnetic north at a place.

Permanent magnets are made of materials with:

A. low retentivity B. high retentivity and coercivity C. zero coercivity D. diamagnetic property

📝 SolutionPermanent magnets need high retentivity (to stay magnetised) and high coercivity (to resist demagnetisation), like steel.

← Previous DPP (29 July 2026) Next DPP (2 August 2026) →

📚 View All DPPs (Archive)

🔔 Don't miss tomorrow's DPP!

Get a new DPP every morning, straight to WhatsApp — free.

📱 Get DPP on WhatsApp

Class 12 · Physics

Fully prepared for the board exam?

Check out Alpha Classes' Exam Kits — notes, PYQs, mock tests and much more.

View Exam Kits →