Management of Natural Resources — Science STD 10 — Question

The flow of electric pulse from one neuron to another takes place from :

The magnetic lines of force due to a bar magnet are :

The metal which can be extracted from the bauxite ore is:

Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

In order to obtain a real image twice the size of the object with a convex lens of focal length 15 cm, the object distance should be:

Acetic acid solution turns :

The element which can from an acidic oxide should be the one whose atomic number is:

Which of the following statement(s) is (are) true about respiration?
i. During inhalation, ribs move inward and the diaphragm is raised
ii. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air
iii. Haemoglobin has a greater affinity for carbon dioxide than oxygen
iv. Alveoli increase surface area for exchange of gases

Which of the following endocrine gland does not occur as a pair in the human body?