341. Water covers __________ of the Earth’s surface?
A. 61%
B. 67%
C. 71%
D. 76%

342. In general, wind speed of 10 –13 kph caused_______?
A. minor or no damage
B. considerable damage
C. severe damage
D. extreme damage

343. Acid rain is mainly caused by emissions of __________ in the atmosphere?
A. Sulfur Dioxide and Potassium Nitrate
B. Sulfur and Charcoal
C. Nitrogen Oxide and Potassium Nitrate
D. Sulfur Dioxide and Nitrogen Oxide

344. About 50% of the Earth’s crust, including the waters on the Earth and atmosphere, is?
A. Oxygen
B. Cabon Dioxide
C. Silicon
D. Clay

345. The fourth state of matter is?
A. Water
B. Salts
C. Vapours
D. Plasma

346. The device used to convert Alternate Current into Direct Current is called?
A. Anemometer
B. Battery
C. Galvanometer
D. Rectifier

347. In night, when photosynthesis is stopped, plants__________?
A. take in Carbon Dioxide
B. take in Oxygen
C. give off Carbon Dioxide
D. give off Oxygen

348. __________ are called the powerhouses of the cell?
A. Mitochondria
B. Vesicles
C. Lungs

349. One of the countries through which equator passes is___________?
A. Kenya
B. Malaysia
C. Malta
D. Pakistan

350. Copper can be converted into gold by ?
A. Artificial radioactivity
B. heating
C. Electroplating
D. Chemical reaction