Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel :

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Q: 23 (NDA-I/2011)
Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel :

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,10,12,5,6,10,1

keywords: 

{'magnetic substances': [0, 0, 0, 1], 'ferromagnetic substances': [0, 0, 0, 1], 'diamagnetic substances': [0, 0, 0, 1], 'magnets': [0, 0, 0, 1], 'paramagnetic substances': [0, 0, 0, 1], 'cobalt etc': [0, 0, 0, 1], 'iron': [0, 0, 1, 1]}

The correct answer is option 3: diamagnetic substances.

When it comes to magnets, they have the ability to attract certain materials and repel others. The materials that can be attracted to magnets include iron, nickel, and cobalt. These materials are known as magnetic or ferromagnetic substances.

However, magnets can also repel certain materials, and these substances are known as diamagnetic substances. Diamagnetic substances are not attracted to magnets, but instead, they create a weak magnetic field in the opposite direction when placed near a magnet. Some examples of diamagnetic substances include water, copper, and gas.

On the other hand, paramagnetic substances (option 1) are materials that are weakly attracted to magnets. While they are attracted to magnetic fields, they do not possess any inherent magnetic properties.

Therefore, the correct answer is option 3: diamagnetic substances.