Which of the following metals is used to make aircraft body?
A. Aluminum
B. Silver
C. Copper
D. All Of These
A. Aluminum
B. Silver
C. Copper
D. All Of These
A. Steel can be saved
B. Accidents due to expansion in summer can be avoided
C. Accidents due to contraction in winter can be avoided
D. Air gasp are necessary for bearing the weight of running train
A. Drinking polluted water causes malaria.
B. The instrument used to measure velocity of wind is barometer.
C. Our eye is very sensitive to blue light.
D. Sound can not travel through vacuum.
A. Potential Energy.
A. Third Law of Newton.
A. The weight of hydrogen is greater than the weight of the air.
B. The weight of hydrogen is equal to the weight of the air.
C. The weight of hydrogen is less than the weight of the air.
D. The surface of the balloon I smooth.
A. Plants give out Carbon Dioxide at night.
B. Plants give out Oxygen at night.
C. Plants give out Nitrogen at night.
D. Plants give out Hydrogen at night.