During winter in cold countries, the ____ is mixed to melt the ice on the icy roads.
A. Salt
B. Chlorine
C. Carbon dioxide
D. Water
In a very low temperature which from the following will freeze at last?
A. River water
B. Canal water
C. Sea water
D. Water in a lake
1 nanometer = ?
A. 10-3 meter
B. 10-6 meter
C. 10-9 meter
D. 10-12 meter
Which from the following is true for “Sound”?
A. Sound cannot travel through a vaccum
B. Sound cannot travel through gases
C. Sound cannot travel through liquids
D. Sound cannot travel through solids