Science Questions

1. Question: A man with a load jumps from a high building. What will be the load experienced by him?
Answer: Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.

2. Question: A piece of chalk when immersed in water emits bubbles. Why?
Answer: Chalk consists of pores forming capillaries. When it is immersed in water, the water begins to rise in the capillaries and air present there is expelled in the form of bubbles.

3. Question: Why does a liquid remain hot or cold for a long time inside a thermos flask?
Answer: The presence of air, a poor conductor of heat, between the double glass wall of a thermos flask, keeps the liquid hot or cold inside a flask for a long time.

4. Question: Why does a ball bounce upon falling?
Answer: When a ball falls, it is temporarily deformed. Because of elasticity, the ball tends to regain its original shape for which it presses the ground and bounces up (Newton's Third Law of Motion).

5 Question: Why is standing in boats or double decker buses not allowed, particularly in the upper deck of buses?
Answer: On tilting the centre of gravity of the boat or bus is lowered and it is likely to overturn.

6. Question: Why is it recommended to add salt to water while boiling dal?
Answer: By addition of salt, the boiled point of water gets raised which helps in cooking the dal sooner.

7. Question: Why is it the boiling point of sea water more than that of pure water?
Answer: Sea water contains salt, and other impurities which cause an elevation in its boiling point.

8. Question: Why is it easier to spray water to which soap is added?
Answer: Addition of soap decreases the surface tension of water. The energy for spraying is directly proportional to surface tension.

9. Question: Which is more elastic, rubber or steel?
Answer: Steel is more elastic for the same stress produced compared with rubber.

10. Question: Why is the sky blue?
Answer: Violet and blue light have short waves which are scattered more than red light waves. While red light goes almost straight through the atmosphere, blue and violet light are scattered by particles in the atmosphere. Thus, we see a blue sky.

11. Question: Why Does ink leak out of partially filled pen when taken to a higher altitude?
Answer: As we go up, the pressure and density of air goes on decreasing. A Partially filled pen leaks when taken to a higher altitude because the pressure of air acting on the ink inside the tube of the pen is greater than the pressure of the air outside.

12. Question: On the moon, will the weight of a man be less or more than his weight on the earth?

Answer: The gravity of the moon is one-sixth that of the earth; hence the weight of a person on the surface of the moon will be one-sixth of his actual weight on earth.

13. Question: Why do some liquid burn while others do not?
Answer: A liquid burns if its molecules can combine with oxygen in the air with the production of heat. Hence, oil burns but water does not.

14. Question: Why can we see ourselves in a mirror?
Answer: We see objects when light rays from them reach our eyes. As mirrors have a shiny surface, the light rays are reflected back to us and enter our eyes.

15. Question: Why does a solid chunk of iron sink in water but float in mercury?
Answer: Because the density of iron is more than that of water bus less than that of mercury.

16. Question: Why is cooking quicker in a pressure cooker?
Answer: As the pressure inside the cooker increases, the boiling point of water is raised, hence, the cooking process is quicker.

17. Question: When wood burns it crackles. Explain?
Answer: Wood contains a complex mixture of gases and tar forming vapors trapped under its surface. These gases and tar vapors escape, making a cracking sound.

18. Question: Why do stars twinkle?
Answer: The light from a star reaches us after refraction as it passes through various layers of air. When the light passes through the earth?s atmosphere, it is made to flicker by the hot and cold ripples of air and it appears as if the stars are twinkling.

19. Question: Why is it easier to roll a barrel than to pull it?
Answer: Because the rolling force of friction is less than the dynamic force of sliding friction.

20. Question: If a feather, a wooden ball and a steel ball fall simultaneously in a vacuum, which one of these would fall faster?
Answer: All will fall at the same speed in vacuum because there will be no air resistance and the earth?s gravity will exert a similar gravitational pull on all.

21. Question: When a man fires a gun, he is pushed back slightly. Why?
Answer: As the bullet leaves the nozzle of the gun?s barrel with momentum in a forward direction, as per Newton's Third Law of Motion, the ejection imparts to the gun as equal momentum in a backward direction.

22. Question: Ice wrapped in a blanket or saw dust does not melt quickly. Why?
Answer: Both wood and wool are bad conductors of heat. They do not permit heat rays to reach the ice easily.

23. Question: Why do we perspire on a hot day?
Answer: When the body temperature rises, the sweat glands are stimulated to secrete perspiration. It is nature's way to keep the body cool. During the process of evaporation of sweat, body heat is taken away, thus giving a sense of coolness.

24. Question: Why does ice float on water but sink in alcohol?
Answer: Because ice is lighter than water it floats on it. However, ice is heavier than alcohol and therefore it sinks in alcohol.

25. Question: Why do we perspire before rains?
Answer: Before the rain falls, the atmosphere gets saturated with water vapors; as a result, the process of evaporation of sweat is delayed.

GK

No.	General Knowledge Question	Answer
1	The first Prime minister of Bangladesh was	Mujibur Rehman
2	The longest river in the world is the	Nile
3	The longest highway in the world is the	Trans-Canada
4	The longest highway in the world has a length of	About 8000 km
5	The highest mountain in the world is the	Everest
6	The country that accounts for nearly one third of the total teak production of the world is	Myanmar
7	The biggest desert in the world is the	Sahara desert
8	The largest coffee growing country in the world is	Brazil
9	The country also known as "country of copper" is	Zambia
10	The name given to the border which separates Pakistan and Afghanistan is	Durand line
11	The river Volga flows out into the	Caspian sea
12	The coldest place on the earth is	Verkoyansk in Siberia
13	The country which ranks second in terms of land area is	Canada
14	The largest Island in the Mediterranean sea is	Sicily
15	The river Jordan flows out into the	Dead sea
16	The biggest delta in the world is the	Ganges Delta
17	The capital city that stands on the river Danube is	Belgrade
18	The Japanese call their country as	Nippon
19	The length of the English channel is	564 kilometres
20	The world's oldest known city is	Damascus
21	The city which is also known as the City of Canals is	Venice
22	The country in which river Wangchu flows is	Myanmar
23	The biggest island of the world is	Greenland
24	The city which is the biggest centre for manufacture of automobiles in the world is	Detroit, USA
25	The country which is the largest producer of manganese in the world is	China & South Africa
26	The country which is the largest producer of rubber in the world is	Malaysia
27	The country which is the largest producer of tin in the world is	China
28	The river which carries maximum quantity of water into the sea is the	Amazon River
29	The city which was once called the `Forbidden City' was	Peking
30	The country called the Land of Rising Sun is	Japan
31	Mount Everest was named after	Sir George Everest
32	The volcano Vesuvius is located in	Italy
33	The country known as the Sugar Bowl of the world is	Cuba
34	The length of the Suez Canal is	162.5 kilometers
35	The lowest point on earth is	The coastal area of Dead sea
36	The Gurkhas are the original inhabitants of	Nepal
37	The largest ocean of the world is the	Pacific ocean
38	The largest bell in the world is the	Tsar Kolkol at Kremlin, Moscow
39	The biggest stadium in the world is the	Strahov Stadium, Prague
40	The world's largest diamond producing country is	South Africa
41	Australia was discovered by	James Cook
42	The first Governor General of Pakistan is	Mohammed Ali Jinnah
43	Dublin is situated at the mouth of river	Liffey
44	The earlier name of New York city was	New Amsterdam
45	The Eifel tower was built by	Alexander Eiffel
46	The Red Cross was founded by	Jean Henri Durant
47	The country which has the greatest population density is	Monaco
48	The national flower of Britain is	Rose
49	Niagara Falls was discovered by	Louis Hennepin
50	The national flower of Italy is	Lily
51	The national flower of China is	Narcissus
52	The permanent secretariat of the SAARC is located at	Kathmandu
53	The gateway to the Gulf of Iran is	Strait of Hormuz
54	The first Industrial Revolution took place in	England
55	World Environment Day is observed on	5th June
56	The first Republican President of America was	Abraham Lincoln
57	The country famous for Samba dance is	Brazil
58	The name of Alexander's horse was	Beucephalus
59	Singapore was founded by	Sir Thomas Stamford Raffles
60	The famous British one-eyed Admiral was	Nelson
61	The earlier name of Sri Lanka was	Ceylon
62	The UNO was formed in the year	1945
63	UNO stands for	United Nations Organization
64	The independence day of South Korea is celebrated on	15th August
65	'Last Judgement' was the first painting of an Italian painter named	Michelangelo
66	Paradise Regained was written by	John Milton
67	The first President of Egypt was	Mohammed Nequib
68	The first man to reach North Pole was	Rear Admiral Robert E. Peary
69	The most famous painting of Pablo Picasso was	Guermica
70	The primary producer of newsprint in the world is	Canada
71	The first explorer to reach the South Pole was	Cap. Ronald Amundson
72	The person who is called the father of modern Italy is	G.Garibaldi
73	World literacy day is celebrated on	8th September
74	The founder of modern Germany is	Bismarck
75	The country known as the land of the midnight sun is	Norway
76	The place known as the Roof of the world is	Tibet
77	The founder of the Chinese Republic was	San Yat Sen
78	The first Pakistani to receive the Nobel Prize was	Abdul Salam
79	The first woman Prime Minister of Britain was	Margaret Thatcher
80	The first Secretary General of the UNO was	Trygve Lie
81	The sculptor of the statue of Liberty was	Frederick Auguste Bartholdi
82	The port of Baku is situated in	Azerbaijan
83	John F Kennedy was assassinated by	Lee Harvey Oswald
84	The largest river in France is	Loire
85	The Queen of England who married her brother-in-law was	Catherine of Aragon
86	The first black person to be awarded the Nobel Peace Prize was	Ralph Johnson Bunche
87	The first British University to admit women for degree courses was	London University
88	The principal export of Jamaica is	Sugar
89	New York is popularly known as the city of	Skyscrapers
90	Madagascar is popularly known as the Island of	Cloves
91	The country known as the Land of White Elephant is	Thailand
92	The country known as the Land of Morning Calm is	Korea
93	The country known as the Land of Thunderbolts is	Bhutan
94	The highest waterfalls in the world is the	Salto Angel Falls, Venezuela
95	The largest library in the world is the	United States Library of Congress, Washington DC
96	The author of Harry Potter Books is	JK Rowling
97	Nickname of New York city is	Big Apple
98	What do you call a group of sheep?	A Flock of Sheep
99	In which sport do players take long and short corners?	Hockey
100	Who was the youngest President of the USA?	Theodore Roosevelt
101	How many legs do butterflies have?	6 Legs & 2 Pair of Wings
102	Who invented the Nintendo Wii?	Kashi Kabushiki
103	What year does the Nintendo Wii come out?	Late 2006
104	Who invented the Light Bulb?	Humphry Davy
105	Who invented the washing machine?	James King
106	Who invented the first electric washing machine?	Alva Fisher
107	Who invented the safety pin?	Walter Hunt
108	Who invented the Vacuum Cleaner?	Hubert Booth

Engligh Alphabets - Amazing part of Team Work

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