Acids, Bases and Salts — Science STD 10 — Question

n order to obtain a magnification of, −0.6 (minus 0.6) with a concave mirror, the object must be placed:

Which of the following statements are true for flowers?

1. Flowers are always bisexual.
2. They contain sexual reproductive organs.
3. They are produced in all groups of plants.
4. After fertilisation they give rise to fruits.

In which of the following compounds, -OH is the functional group?

Progesterone and relaxin bring about changes in the body of a

In extraction of copper, the flux used is :

A solution turns blue litmus red. Its pH is likely to be:

Characters that are transmitted from parents to offspring during reproduction show :

Ozone depletion has resulted in:

A student has to determine the focal length of a concave mirror by obtaining the image of a distant object on a screen. For getting best result he should focus :

An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be: