A. Heat into x-rays
B. Sound into electrical signals
C. Electrical signals into pictures
D. Picture into electrical signals
A. Reduce the friction between the wheel and the axle
B. Increase the friction between the wheel and
C. Reduce the friction between ground and the wheel
D. None of these
A. It is a metal
B. Ratio of stress to strain is more
C. Ratio of stress to strain is less
D. Its density is high
A. Red corpuscles
B. Hemoglobin
C. Plasma
D. Certain secretions
A. To save the cost of metal
B. To allow for the expansion during heat
C. To permit the shrinkage of metal
D. None of the above
A. Sliding to rolling
B. Rolling to sliding
C. Potential energy to kinetic energy
D. Dynamic to static
A. To prevent the dust from collecting on the ice
B. Because ice being cold cannot be lifted with bare hands
C. To provide necessary insulation from heat
D. None of the above
A. Hydrochloric acid
B. Nitric acid
C. Sulphuric acid
D. Carbonic acid