MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
What is the density of iron?
Think it through first, then pick an option.
- a 7.80 mg/cc
- b 2.60 mg/cc
- c 1.00 mg/cc
- d 0.25 mg/cc
Answer and explanation
Correct answer: a 7.80 mg/cc
The density of iron is 7.80 gm/cc, so this value is the right one. The paper prints the unit as mg/cc, which is a misprint for gm/cc.
Why the other options are wrong
- b 2.60 mg/cc: The value 2.60 is the density of glass (in gm/cc), not of iron.
- c 1.00 mg/cc: The value 1.00 is the density of water (in gm/cc); iron is far denser than water.
- d 0.25 mg/cc: The value 0.25 is the density of cork (in gm/cc), not of iron.
More board questions on this topic
- What is the density of the human body in kg m⁻¹?
- What is the density of the human body?
- Density of a body depends on which of the following things?
- Even if the volumes of two bodies are equal, the one with-
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