151. _ is a good radiator of heat.
A. A dull black surface
B. A green-colored surface
C. A white surface
D. A shining silvered surface
152. False ceiling is done to?
A. Keep the roof clean
B. Lower the height of ceiling
C. Cool the room
D. Insulate the ceiling
153. In __ state of matter, molecules do not leave their position.
A. Gas
B. Plasma
C. Liquid
D. Solid
154. The rate of doing work is called?
A. Torque
B. Energy
C. Power
D. Momentum
155. The altitude of Geostationary orbits in which communication satellite is launched above the surface of the earth is?
A. 860 KM
B. 1000 KM
C. 42300 KM
D. 60000 KM
156. What is the source of electric energy in an artificial satellite?
A. Nuclear reactor
B. A dynamo
C. A thermopile
D. Solar cells
157. Radioactive element which has been found to have reserves in DG Khan area of Pakistan is?
A. Uranium
B. Thorium
C. Radium
D. Plutonium
158. Non-conventional source of energy best suited for Pakistan is?
A. Solar energy
B. Wind energy
C. Tidal wave energy
D. Nuclear energy
159. The magnetic effect of electric current was first observed by?
A. Henry
B. Oersted
C. Faraday
D. Volta
160. In 2010, China became the third country in the world to possess an anti-satellite weapon system. The other two countries are?
A. Germany and Russia
B. France and the USA
C. The USA and Germany
D. The USA and Russia
Admin