Science-GK Related Question Answers

76. The botanical name for brinjal is

Solanum melongenal

77. Which is the second most common element on the earth's surface?

Silicon.

78. How are hereditary characters transmitted from one generation to the next?

Genes are believed to be responsible for transmitting hereditary characters. Every human cell contains 23 pairs of chromosomes, which are made up of many paired particles or units called genes.

79. What is the disease that causes dogs to turn mad?

Rabies.

80. How do bats communicate with each other?

Bats produce screeching sounds. As these sounds strike objects around them, they produce echoes, which are heard by the bats. This helps the bats in navigation. Human beings cannot hear the sounds produced by the bats as they have much higher frequency than the audible range of the human ear.

81. The response of a plant to touch is called

Trigmotropism

82. Who invented the aeroplane heavier than an air machine that could fly?

Orville and Wilbur Wright.

83. What is the principal enzyme in the gastric juice?

Pepsin.

84. Fruits that are formed without fertilization are called

Parthenocarpic

85. What is vulcanisation of rubber?

The process of hardening rubber by adding sulphur and heating the mixture is vulcanisation. Vulcanisation was discovered by Charles Goodyear. Raw rubber is sticky. It hardens when the temperature is low and softens when it is high. Charles Goodyear discovered that by combining raw rubber with sulphur and by heating it, the rubber becomes stronger and elastic and also resistant to solvents. Today almost all rubber, whether natural or synthetic is vulcanized.

86. What is the meaning of the word "DINOSAUR"?

Terrible lizard.

87. Bismuth was discovered by

Valentine

88. Why do planes flying at great speeds leave white fumes behind?

The planes leaving fume behind are jet planes. In a basic jet engine air is compressed and forced into a chamber, where fuel is added. Here combustion (burning) takes place. The hot gases that are produced escape from the base of the engine. This pushes the aircraft forward. The white fumes that you see are the hot gases as they escape out. Since the temperature around the jet is low, the fume condenses and becomes visible.

89. What does milking of poisonous snakes mean?

It means drawing out poison from the serpents for medical use.

90. How does an Octopus camouflage itself?

By changing its colour and merging with the background.

91. What are radioactive elements?

These are elements in which protons and neutrons are not in balance. They slowly breakdown to form stable elements.

92. Who discovered the germ, which causes tuberculosis?

Robert Koch, a famous German physician.

93. ISAC stands for

ISRO Satellite Centre

94. Why does the sound of water keep changing when a vessel is being filled under a tap?

Sound is produced by the movement of columns of air. Strike a stainless steel glass with a spoon. A sound is produced. Stop the vibration of the steel glass with your fingers. There will be no sound. When water is being filled in a vessel, sound is produced because of the movement of the column of air. This column becomes smaller and smaller as the water level rises in the vessel. Hence the sound changes.

95. Who was the scientist who initiated the Atomic Energy Programme of India?

Homi Bhabha.

96. How many lobes does a human liver have?

Four

97. The symbol Rb stands for

Rubidium

98. How do bees communicate?

Bees communicate the source of nectar to others by the pattern of the dance they perform.

99. Stethoscope was invented by

William Stockes

100. What is the study of prehistoric animal and plant life through the analysis of fossils called?

Palaeontology.
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