Answer:

To determine which of the given objects get attracted to a magnet, we need to understand the properties of magnets and the materials they attract.

Magnets and their properties:
- Magnets are objects that produce a magnetic field, which can exert a force on certain materials.
- The two ends of a magnet are called the north pole (N) and the south pole (S).
- Like poles repel each other, while opposite poles attract each other.

Materials attracted to magnets:
- Magnets attract objects made of iron, nickel, and cobalt. These materials are known as ferromagnetic materials.
- When a magnet is brought close to a ferromagnetic material, the material becomes magnetized and is attracted to the magnet.

Analysis of the given objects:
a) Copy book: Copy books are usually made of paper, which is not attracted to magnets. Therefore, copy books are not attracted to magnets.
b) Silver spoon: Silver is not a ferromagnetic material. Therefore, silver spoons are not attracted to magnets.
c) Comb: Combs are commonly made of plastic or wood, neither of which is attracted to magnets. Therefore, combs are not attracted to magnets.
d) Common pins: Common pins are typically made of iron, which is a ferromagnetic material. Therefore, common pins are attracted to magnets.

Conclusion:
Out of the given options, only common pins are attracted to magnets. The rest of the objects (copy book, silver spoon, and comb) are not attracted to magnets because they are made of materials that are not ferromagnetic.