Class 12th Physics | SSP Education

Physics Practice

Chapter-wise Physics practice for Class 12th.

Use these original NCERT-style examples to practice formulas, concepts, and exam reasoning chapter by chapter.

Back to Class 12th Physics Chemistry Biology

Chapter-wise Practice

These are original chapter-wise practice questions inspired by Class 12th NCERT-style learning goals, not copied textbook examples.

Question 1

Two charges of 3 x 10^-6 C and 6 x 10^-6 C are placed 2 m apart in air. Find the force between them.

Answer:

Apply Coulomb's law: F = kq1q2 / r^2 = (9 x 10^9 x 18 x 10^-12) / 4 = 4.05 x 10^-2 N.

Question 2

Define electric field intensity and state its SI unit.

Answer:

Electric field intensity is the force experienced by a unit positive test charge at a point. Its SI unit is newton per coulomb (N/C).

Question 1

A conductor has resistance 8 ohm and is connected to a 12 V source. Calculate the current.

Answer:

Using Ohm's law, I = V / R = 12 / 8 = 1.5 A.

Question 2

Why does resistance of a metallic wire increase with temperature?

Answer:

Higher temperature increases lattice vibrations, which causes more collisions for electrons and raises resistance.

Question 1

State the mirror formula and identify each quantity.

Answer:

The mirror formula is 1/f = 1/v + 1/u, where f is focal length, v is image distance, and u is object distance.

Question 2

A convex lens has focal length 20 cm. If an object is at 30 cm, what type of image is formed?

Answer:

Since the object lies between F and 2F, the image will be real, inverted, and magnified beyond 2F.

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