12. Which grows up from the ground, a stalactite or a stalagmite?
Stalagmite.

13. In radiation wavelenght is measured, radio rays are the longest. What are the shortest?
Gamma rays.

14. If a cathode is a negative electrode, what is a positive electrode?
Anode.

15. Galena is an ore of which metal?
Lead.

16. Which scale of wind velocity was named after a 19th-century English admiral?
The Beaufort Scale.

17. Who built the first successful petrol-driven car?
Karl Benz.

18. What weapon was designed in 1866 by the British engineer Robert Whitehead?
Torpedo.

19. What unit of weight equals 100 kilograms?
Metric ton (tonne).

20. What metallic element shares its name with a famous London theatre?
Palladium.

21. What is the acronym for 'sound navigation and ranging'?
Sonar.

22. Who first stated the laws of gravitation and light and also constructed the first reflection telescope?
Isaac Newton.

23. What in the metric system is equivalent to a cubic decimeter and equals 1.76 English pint?
Litre.

24. How many pounds are there in a kilogram?
2.2

25. What are Astra, Eutelsat, Intelsat and Telecom?
Satellites which transmit, or have transmitted, satellite television channels.

26. Who was the British engineer who invented the ACV (air cushion vehicle) in 1955?
Sir Christopher Cockerell.

27. Of what is metrology the study?
Measurement.

28. Who became Humphry Davy's assistant in 1813?
Michael Faraday.

29. What is measured by a bolometer?
Radiant energy.

30. What is the name given to a quadrilateral which has all its sides equal, but no right angles?
Rhombus.

31. What device was invented in 1954 by C.H.Townes?
Laser.

32. What colour is formed by adding together yellow, cyan and magenta?
Black.

33. In the metric system, what word/prefix stands for one-millionth?
Micro.

34. One tablespoon is equal to how many tespoons?
3.

35. Hg is the chemical symbol for which element?
Mercury.

36. Which element is the best conductor of electricity?
Siver.

37. What is the only gem which is of animal origin?
Pearl.

38. From which country does Indian ink originate?
China.

39. Which star is the constellation Canis Major is also know as the Dog Star?
Sirius.

40. Of what is seismology the study?
Earthquakes.

41. Which French physicist gave his name to the SI unit of electric current?
Ampere.

42. Which famous motor car did Ferdinad Porsche design in 1937?
Volkswagen Beetle.

43. What colour is alabaster?
White.

44. What measurement is equal to the imperial measure of 3.3 feet?
Metre.

45. What alloy consists of a mixture of copper, tin and zinc?
Gun-metal.

46. What radioactive element has the symbol Pm?
Promethium.

47. What kind of weapon is a Bofors?
Ani-aircraft gun.

48. What is know as the Red Planet?
Mars.

49. What wind-powered device was first built in Persia around 500AD?
Windmill.

50. In the metric system, what word/prefix represents one-tenth?
Deci.

51. Which German physicist laid down the principles of quantum theory?
Max Planck.

52. In which science is Karl Fredrich Gauss one of the all-times great?
Mathematics.

53. How many dozen are there in a gross?
12.

54. Which variety of quartz is violet to purple in colour and is the birthstone for February?
Amethyst.

55. Of what was the Flemish geographe, Gerandus Metcator, an originator?
Maps.

56. Which astronomer discovered the planet Uranus?
Herschell.

57. Who invented the electric lamp?
Thomas Edison.

58. What element has the symbol Pb?
Lead.

59. What colour is formed by mixing green and red light?
Yellow.

60. After hydrogen, what is the second most abundant element in the universe?
Helium.

can u tell me plz what is difference between current and voltage?

__________________
"if the going seems easy.......u r going downhill"

Current: A current is measured in amperes (A) and it indicates the rate at which charge is flowing. The size of the electric current is the rate of flow of electrons.
One ampere is equal to one coulomb of electric charge passing any point in a counductor in one second.

Voltage: The voltage is the potential difference - the difference in potential between two charged points. It is also know as p.d. and is measured in volt (V).
One volt is the p.d. between two points when one coulomb of electricity passes between these points and produces one joule of work.

here bi hv two more questions if u can help me out it will b SOOOOOOO kind of u
1:does electrons physiacally move from one point to another in a conductor?
2:according to mathematical reletions:

power =(I^2) * R;

and
power=(v^2)/R; in electric circuits.

how can b power b directly and as well as inversely propotional to resistance(R) at the same time???

__________________
"if the going seems easy.......u r going downhill"

1:does electrons physiacally move from one point to another in a conductor?

If two conductors at different potentials are joined by a conducting wire, electrons will flow from one to the other until both are at the same potential. Free electrons in both conductors then have the same average potential energy.
Electrons always flow from lower to higher potential, i.e. , towards the more positive potential.

Also, if there is a p.d. between any two points on a charged conductor, electrons will flow until both points were at the same potential, as:
All points on a charged conductor are at the same potential.



2:according to mathematical reletions:

power =(I^2) * R;

and
power=(v^2)/R; in electric circuits.

how can power b directly and as well as inversely propotional to resistance(R) at the same time???

The power output of a battery depends on the p.d. across its terminals and on the current it supplies.

Suppose, if a battery has a p.d. of 6V across the terminals. The current in the circuit is 2A. Using the meaning of the volt and the ampere:
each coulomb of charge pushed out of the battery carries 6 joules of electric energy, and 2 coulombs are pushed out every second. The battery therefore supplies 6*2, or 12, joules of electrical energy every second, i.e. its power output is 12 watts.

The power in this case is worked out by multiplying the p.d. by the current, a rule which applies generally:
power= p.d. * current (P= VI)

The power disipated as heat in a resistor can also be calculated using P= VI. If a resistor has a p.d. of 6V across it and a current of 2A flowing through it, then:
power dissipated= VI= 6V*2A= 12W
The resistor therefore gives out 12 joules of thermal energy every second.

Alternative equations for calculating power can be found by substituting V= IR and I= V/R in turn in the equation P= VI as follows:

1. P= VI= IR*I= (I^2)*R

2. P= VI= V*V/R= (V^2)/R

Therefore, in the first equation, using IR in place of V proves R as a direct propotion to P. Whereas, in the second equation, using V/R in place of I proves R as an indirect propotion to P.

so if we need a power of 12W across resistor ,current is 5 amp,voltage is 220v AC,which value of resistance should b chosen so that BOTH of the relations are hold????????

__________________
"if the going seems easy.......u r going downhill"

well, i have a question for miss nida
how valency is balanced in case of Fe3O4 which is compound of iron with oxygen.
hope you have got what i wanted to convey.

__________________
Whatever mind can conceive,it can achieve - W.Clement Stone

According to me, it is impossible to get one value of R which will satisfy both equations as in one equation R is directly proportional while in the other it is indirectly proportional. But this is how you can find the best possible value of R:

First, find the total power and total resistance value in the circuit:
P= V*I = 220*5 = 1100W
R= V/I = 220/5 = 44 ohms (resistance is measured in ohm)

Now to find the resistance value which will give 12W, you can use cross multiplication:
If 44 ohms give 1100W, what value of resistor will give 12W?
(12*44)/1100 = 0.48 ohms


Substituting 12W in both the equations, we get following values for R:

1. P= (I^2)*R
12= (5^2)*R
R= 12/25= 0.48 ohms

2. P= V*V/R
12= 220*220/R
R= 12/48400= 0.00025 ohms

Notice that we get two different values for R, and when you will substitute one R value in the other equation you will not get 12W in any case. This proves that there cannot be one value for R to satisfy both equations. As already mentioned, in one equation R is directly proportional while in the other it is indirectly proportional. So, according to me, the first applied method is correct. This is how I could solve this question. Do tell me if there is any mistake.

@waseem gurmani
I never opted chemistry in my academic, so sorry cannot answer your question. In science, biology and physics are possible.

61. In which layer of the atmosphere does the ozone layer occur?
Stratosphere.

62. Which of the following did Benjamin Hall invent in 1900: the tractor, the safety pin or the zipper?
The tractor.

63. What was first constructed at Artois in France to obtain water from between layers of rock?
An artesian well.

64. Which element has the symbol Au?
Gold.

65. The Ripplecraft was the original name for which vehicle?
The hovercraft.

66. What is measured in Hertz?
Frequency.

67. Who was the English motor manufacturer who died a baron in 1941 and who pioneered the small motor car?
1st Baron Austin.

68. Which Scottish chemist founded the mineral oil industry of Scotland
James Young.

69. What colour does an alkali change litmus paper to?
Blue.

70. What is the common name for calcium carbonate?
Chalk.

71. What is the longest side of a right-angled triangle?
Hypotenuse.

72. What in computer language do the initials ISDN stand for?
Integrated Services Digital Network.

73. What does a baroscope measured?
Atmospheric pressure.

74. What word means the bending of light when passing through a lens?
Refraction.

75. In what type of engine is fuel ignited by compression?
Diesel.

76. What system of measurement is used for precious metals?
Troy.

77. What instrument for detecting radioactivity is named after a 20th-century German physicist?
Geiger counter (Hans Geiger).

78. Brass is an alloy of which two minerals?
Copper and zinc.

79. From what country does the Skoda motor car originate?
Czech Republic.

80. What in France is a TGV?
A high speed train.

81. The US industrialist Leo Hendrick Baekeland, the inventor of Bakelite, was born in which country?
Belgium.

82. Who made the first successful baloon flight in 1783, flying 9 km across Paris?
The Montgofier Brothers.

83. Which gas smells like rotten egg?
Hydrogen Sulphide.

84. Which store in the UK, in 1898, was the first to have an escalator installed?
Harrods.

85. The pineal body, the parietal lobe and the frontal lobe are in which part of the human anatomy?
The brain.

86. What, in our solar system, are Ceres, Palles, Juno and Vesta?
Asteroids.

87. What is the SI unit of temperature?
Kelvin.

88. How many chromosomes has a normal human body cell?
46.

89. What does a cryometer measure?
Extremely low temperatures.

90. Which plan, which has purplish-blue hood-shaped flowers, is also known as 'mook's-hood'?
Aconite.

91. Which of the following were invented by a Greek Philo in 250 BC: nails, springs or screws?
Springs.

92. Which French educationalist perfected a system of reading for the blind?
Louis Braille.

93. What is the colour of the mineral beryl when it contains chromium?
Green.

94. Who, in 1929, propounded the Bing Bang Theory?
Edwin Hubble.

95. What are goolet and ferula type of?
Boats.

96. Which company's name is associated with the Comet aircraft?
De Havilland.

97. Which 3rd-century Greek mathematician wrote Elements of Geometry, which remained a standard text book until the 20th century?
Euclid.

98. What medical apparatus was invented by a French doctor, Rene Theophile Hyacinthe Laennec, in 1816?
The stethoscope.

99. How many yards are there in a furlong?
220.

100. What was first predicted around 600 BC by a Greek scientist, Thales?
An eclipse of the sun.

101. Which German physicist devised a temperature scale with a boiling point of 212 degrees?
Fahrenheit.

102. What is a dirigible a type of?
Airship.

103. What did the Frenchman Joseph Marie Jacquard invent?
A type of loom.

104. Which British leader of an Antartic expedition died in 1912 whilst returning from the South Pole?
Robert Falcon Scott.

105. Who first succeed in transmitting a radio signal across the Atlantic Ocean?
Marconi.