Reproduction in animals — Science STD 8 — Question

Why do mountaineers usually suffer from nose-bleeding at high altitudes?

Name a device which works on the reflection of reflected light.

Which of the following liquids conduct electricity and which do not conduct electricity?
Lemon juice, Milk, Vinegar, Common salt solution, Sulphuric acid solution, Sugar solution, Distilled water, Honey, Sea water, Rainwater.

Which force is responsible for raising our body hair when we try to take off a terylene or polyester shirt in the dry weather?

Give two examples of situations where you push or pullto change the state of motion of objects.

Name some of the preservatives which are used in the preservation of fruits as jams and jellies.

What are the two ways in which food grains are stored on a large scale?

A person is in open space during a thunderstorm with no shelter (not even a tree) available nearby. Describe the safe position which he should take to protect himself from lightning. Why is this position considered safe?

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

A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection?