What type of electric charge is acquired by a rubber balloon when rubbed with a woolen cloth?

What are the two kinds of electric charges?

What kind of electric charge is acquired:

(a) by a glass rod rubbed with silk cloth?

(b) by a plastic comb rubbed with dry hair?

A negatively charged object attracts another charged object placed near it. What is the nature of charge on the other object?

A positively charged object repels another charged object kept close to it. What is the nature of charge on the other object?