Which of the following `"is"//"are"` ture?

During extraction of copper, it is obtained in the form of molten matte. Which of the following is not ture?

Which of the following is ture ?

Which of the following is ture ?

Which of the following is ture ?

Which of the following is ture ?

If A={1,2,3}, B={4,5,6},C={1,2,3,9,6} then which of the following is not ture?

Which of the following is not ture?

A rectanglar body is held at rest by pressing it againts a vertical wall for which mult1 . Which of the following is generally ture?