Science-GK Related Question Answers

26. Why is food preserved in a refrigerator?

Most bacteria are destroyed as the temperature of the surroundings rises. Temperatures higher than 40° C do not favour growth of bacteria. Similarly low temperatures prevent bacteria from multiplying. Hence food is preserved in the refrigerator by keeping its contents at low temperature.

27. What is ecology?

Ecology is the study of plants and animals in relationship to their environment. Everything that affects plants and animals and how they are dependent upon their surroundings is the subject matter of the study of ecology.

28. Galileo's first scientific discovery was


29. The first human being to land on moon was

Neil Armstrong

30. The basic building blocks of proteins are

Amino acids

31. What is the name for the unit of electric power?


32. Chlorine is very injurious to health. So is sodium. The table salt we use is sodium chloride. Why is it not dangerous to health?

It must be noted that a compound formed from two or more elements need not have a single property of its constituent elements. Sodium and Chlorine combine to form table salt, which is healthy (in small amounts). Water, which sustains life, is formed from hydrogen and oxygen. The properties of hydrogen as well as oxygen are not found in water.

33. What is smog?

Smog is a mixture of solid and liquid fog and smoke particles. Fog is formed when the humidity is high. The word smog is derived from smoke + fog.

34. Toxicology is the study of


35. A tangent galvanometer is used to study the

Strength of direct current

36. How much time does light take to reach the earth from the sun?

8 minutes.

37. What was the name of the instrument used by Jagadis Chandra Bose to measure sensitivity of plants?


38. What is the common unit of measurement of electric power?

Kilowatt Hour.

39. Why do we feel sleepy after a heavy meal?

The blood circulation to the digestive tract increases. As a result the blood circulation to the brain is reduced. This makes us sleepy.

40. How can astronauts walk in space without any support to walk on?

Because there is hardly any gravity far away from the earth. (Or any heavenly body).

41. What is a fungus?

A fungus is a plant without chlorophyll or true leaves, stem and root. Since they are unable to make their own food, they must live on other living or dead plants and animals. Fungi (plural of fungus) are found almost everywhere. Mushrooms are fungi.

42. How many parts was a day divided into, in ancient India?

Eight parts, called prahars. The Hindi word 'dupahar', for noon, is derived from 'du' (two) and pahar (prahar).

43. Who discovered the Laws of Motion?

Sir Isaac Newton,

44. Who was the founder of the system of medicine known as Homoeopathy?

Samuel Hahnemann.

45. Electromagnet was invented by

William Sturgeon

46. The role of heredity was demonstrated by


47. What method of healing is also known as shiatsu?


48. What is a cocoon?

It is a silk case, that covers a caterpillar before it becomes a moth (butterfly). After the caterpillar is completely wrapped in its cocoon, it sleeps through the winter.

49. From which material is aluminum made?


50. What is a Supernova?

A star, which suddenly burns up a lot of its matter and gives a brilliant light.
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