MCQ
Round off the value $2.845$ to three significant figures.
- A$2.85$
- ✓$2.84$
- C$2.80$
- D$2.83$
$2.845 \Rightarrow 2.84$
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In the experiment $I$ : a copper rod is used and all ice melts in $20$ minutes.
In the experiment $II$ : a steel rod of identical dimensions is used and all ice melts in $80$ minutes.
In the experiment $III$ : both the rods are used in series and all ice melts in $t_{10}$ minutes.
In the experiment $IV$ : both rods are used in parallel and all ice melts in $t_{20}$ minutes.

Where $A$ and $K$ are positive constants