Question : Among the following, in which material is the speed of sound is highest? (at 25°C)
Option 1: Nickel
Option 2: Steel
Option 3: Iron
Option 4: Aluminium
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Correct Answer: Aluminium
Solution : The correct option is Aluminium.
Aluminium typically has the highest speed of sound. Aluminium is known for its relatively low density and high elasticity compared to the other materials listed. The approximate speed of sound in aluminium at room temperature is about 6420 metres per second (m/s). In comparison, the speed of sound in iron, steel and nickel is lower than in aluminium due to their differences in density and elasticity.
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Question : Which one of the following contains the maximum percentage of Carbon?
Option 1: Cast iron
Option 2: Stainless steel
Option 3: Wrought iron
Option 4: High speed steel
Question : An isotope of which of the following is used in the treatment of cancer?
Option 1: Cobalt
Option 2: Iron
Option 3: Nickel
Question : Which one of the following is the purest commercial form of iron?
Option 1: Pig iron
Option 3: Stainless steel
Option 4: Wrought iron
Question : Magnetic keepers are pieces of:
Option 1: nickel
Option 2: cobalt
Option 3: steel
Option 4: soft iron
Question : The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean temperature of the whole week is 25.2°C, then the temperature on the 4th day is:
Option 1: 25.5°C
Option 2: 25°C
Option 3: 25.2°C
Option 4: 25.6°C
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