201 How many arms does a starfish have? Usually five.
202 What is a solar eclipse? The moon comes in between the sun and the earth, and thereby prevents sunlight from reaching the earth.
203 Who first saw mountains and craters on the moon using a telescope? Galileo Galilei
204 Which is the largest animal on land? African Elephant.
205 Why does a rhinoceros spend so much time in mud? To keep cool and protect itself from insect bites.
206 Which country first used fingerprints to identify people? Assyria and China.
207 In which country was silk first made? China.
208 What is cholesterol? Cholesterol is a fat found in the human body and the body of other large animals. In its pure form it looks like white sugar. It is made up of tiny crystals, which can be seen under a microscope. It is said that too much cholesterol in the blood is responsible for the hardening of arteries and for various other heart ailments.
209 How did the watch get its name? From the fact that you have to watch it to know the time.
210 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.
211 When faced with danger what does a Pangolin do? It rolls into a ball.
212 Where is the entrance to a baya’s nest? At the bottom of the nest.
213 What is glass made from? Limestone, Silica and Soda ash.
214 What is the microscopic study of plant and animal tissue called? Histology.
215 How does a mariner’s compass help the mariner? The needle of the compass always points towards the magnetic north pole. This indicates the direction in which the ship is moving.
216 Which is the second largest planet in our Solar System? Saturn.
217 How many weeks after birth does the young one of a cat opens its eyes? Three weeks.
218 The arms of the Octopus have sucker cups. What is the use of these cups? To hold onto a surface.
219 What food does a bear love most? Honey.
220 How did the Romans rub off what was written on a wooden slate coated with wax? By heating the slate, the wax was melted. The slate became ready to reuse.
221 What are seashells? Outer casings of soft-bodied animals, called molluscs.
222 How is a pearl formed within the body of an oyster? A pearl is formed when a grain of sand or other foreign matter gets between the hard outer shell and the inner coat called the mantle, of a mollusc. The mollusc surrounds the irritation with nacre, a secretion from the mantle. Many thin layers of nacre give the pearl its lustre.
223 How much time does Pluto take to complete a revolution around the sun? 248 years.
224 What is a Catamaran? A boat with twin parallel hulls. [From the Tamil words katta and maram, meaning tied up (katta) tree (maram).
225 How many ears does a spider have? None.
226 How much time does light take to reach the earth from the sun? 8 minutes.
227 What is acceleration? The time rate at which the velocity of a point is changing is acceleration. Velocity is just the speed (miles per hour or kilometres per second). The term acceleration is used when the speed keeps increasing. The term deceleration is used when the speed becomes less and less.
228 How does a spider eat its food? The spider inserts his fangs into the victim’s body and uses them as straws to suck out the liquid.
229 Who invented the telescope? Hans Lippershey.
230 Why do people living in the deserts prefer white colour for their robes? White coloured robes do not absorb light, whereas dark-coloured clothes absorb the light and conduct heat to the body.
231 What is common to dolphins and humans? They are both mammals.
232 In which country was the day first divided into 12 parts? Babylon (modern Iraq).
233 How does a rocket move forward? It moves forward due to propulsion. You must have seen that a boatman pushes the water backwards with his oar. This creates a force in the forward direction. This is propulsion. Newton’s third law of motion states action and reaction are equal and opposite. In a rocket when hot gases come out of the rear with great force as a result of combustion, a force is created in the opposite direction. This takes the rocket forward.
234 What are the things necessary to start a fire? Heat, fuel and oxygen.
235 How many legs does a butterfly have? Six.
236 Who invented the aeroplane heavier than an air machine that could fly? Orville and Wilbur Wright.
237 Who invented the modern lift? Elisha Otis.
238 Why can’t cranes perch on trees branches? They cannot curl their toes. As a result they cannot have a firm grip on a branch.
239 Ancient Sumenans used to write on clay. How could this writing be preserved? By baking the tablets. This would remove the moisture from the tablets and harden them.
240 How big are the tusks of an Indian female elephant? Indian female elephants do not have tusks.
241 Bats cannot see. Then how do they move about? They emit sounds of low intensity, which are reflected from the objects around them. This helps the bats to move about.
242 How does a frog catch an insect? It throws out its tongue, which is sticky and catches the insects.
243 What is a Portuguese Man of War? A name commonly applied to jelly fish, found in tropical seas.
244 Why are oceans important to man? They enable man to travel to distant corners of the world. They also provide food, oil and minerals.
245 What is the transparent portion in front of the eyeball called? Cornea.
246 What is the meaning of the pecking order? Pecking order is an example of hierarchy among animals, particularly hens. In a coup containing hens and cocks, the seniormost cock can peck at all the other hens and cocks in the coup. A hen can peck at others weaker than it, but must permit pecking by senior members in the hierarchy.
247 Who made trains run by steam engine popular? George Stephenson
248 How are volcanoes caused? Deep under the crust of the earth is molten rock or lava, also called magma. It is under great pressure because of the intense heat around it and the weight of the earth’s crust. When this hot boiling mass finds an outlet in the underside of the earth’s crust, it comes through the surface as lava.
249 What is a male ant called? Drone.
250 How can a frog make such a loud sound? As the frog forces air from the lungs, vocal chords in the voice box (larynx) vibrate to make calls, distinctive of its species. The bulls of some species have air sacs, which help, increase the volume of the sound.


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nanu brithwal

I'm Nitesh Brithwal Nanu , An Indian Engineer who is passionate about technology , current affairs , general Knowledge & programming . Constantly learning and experiencing new things.

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