Chemical Reactions and Equations — Science STD 10 — Question

The control rods used in the reactor of a nuclear power plant are made of :

Which of the following statements are true?

1. Sudden action in response to something in the environment is called reflex action.
2. Sensory neurons carry electrical signals from spinal cord to muscles in a reflex action.
3. Motor neurons carry signals from receptors to spinal cord in a reflex action.
4. The pathway of transmitting signals from a receptor to a muscle is a reflex action.

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

1. Good thermal conductivity.
2. Good electrical conductivity.
3. Ductility.
4. High melting point.

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.

The male gametes in a flower and in a human are produced respectively in :

Match the following with correct response.

Column A	Column B
(i) The response of a plant to light	(a) Phototropism
(ii) The response of a plant to gravity	(b) Hydrotropism
(iii) The response of a plant to water	(c) Geotropism
(iv) The response of a plant to chemicals	(d) Chemotropism

The compound obtained on reaction of iron with steam is/ are:

The colour of white light which is deviated the maximum on passing through the glass prism is:

Which of the following is a weak acid?