1291. A mobile phone sends and receives messages through :
A. Sound waves
B. Micro waves
C. Ultraviolet waves
D. Radio waves *
1292. Dry Ice is :
A. liquid Nitrogen
B. Water Ice
C. Solid carbon dioxide *
D. Frozen Ethanol
1293. The primary colours are blue,green and :
A. Red *
B. Yellow
C. Orange
D. None of these
1294. What constitute current in a metal wire ?
A. Electrons *
B. Protons
C. Atoms
D. Molecules
1295. Good conductors have many loose bounds :
A. Atoms
B. Protons
C. Molecules
D. Electrons *
1296. Which of the following is a good conductor of heat and electricity ?
A. Diamond
B. Anthracite
C. Granite
D. Graphite *
1297. The various distribution circuits are connected in :
A. Series
B. Parallel *
C. Series or parallel
D. None of these
1298. Which gas is typically used in airships and balloons?
A. Hydrogen
B. Helium *
C. Carbon
D. Nitrogen
1299. Which elements has been found in D.G khan of pakistan is :
A. Uranium *
B. Thorium
C. Radium
D. Plutonium
1300. Non-conventional source of energy best suited for pakistan is ?
A. Solar Energy *
B. Wind Energy
C. Tidal wave energy
D. Nuclear Energy