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##### In which of the following systems of units, a weber is the unit of magnetic flux?
1. [ ] CGS
2. [ ] MKS
3. [x] SI
4. [ ] FPS
##### A student measured the length of a rod and, wrote it as 3.50 cm . Which instrument did he use to measure it? $\rightarrow$ JEE Main:2014
1. [ ] A meter scale
2. [x] A vernier calliper where the 10 divisions in vernier scale matches with 9 divisions in main scale and main scale has 10 divisions in 1 cm
3. [ ] A screw gauge having 100 divisions in the circular scale and pitch as 1 mm
4. [ ] A screw gauge having 50 divisions in the circular scale and pitch as 1 mm
##### The respective number of significant figures for the numbers 23.023, 0.0003 and $2.1 \times 10^{-3}$ are
1. [x] $5,1,2$
2. [ ] $5,1,5$
3. [ ] $5,5,2$
4. [ ] $4,4,2$
##### The radius of a uniform wire is $r=0.021\hspace{1mm}cm$. The value of $\pi$ is given to be 3.142. What is the area of cross-section of the wire up to appropriate significant figures?
1. [x] $0.0014\hspace{1mm}cm^{2}$
2. [ ] $0.00139\hspace{1mm}cm^{2}$
3. [ ] $0.001386\hspace{1mm}cm^{2}$
4. [ ] $0.0013856\hspace{1mm}cm^{2}$
##### A man runs 100.5 m in 10.3 s . Find his average speed up to appropriate significant figures.
1. [x] $9.76\hspace{1mm}ms^{-1}$
2. [ ] $9.708\hspace{1mm}ms^{-1}$
3. [ ] $9.7087\hspace{1mm}ms^{-1}$
4. [ ] $9.70874\hspace{1mm}ms^{-1}$
##### If the length of rod $A$ is $3.25 \pm 0.01\hspace{1mm}cm$ and that of $B$ is $4.19 \pm 0.01\hspace{1mm}cm$, then the rod $B$ is longer than $\operatorname{rod} A$ by
1. [ ] $(0.94 \pm 0.00)\hspace{1mm}cm$
2. [ ] $(0.94 \pm 0.01)\hspace{1mm}cm$
3. [x] $(0.94 \pm 0.02)\hspace{1mm}cm$
4. [ ] $(0.094 \pm 0.005)\hspace{1mm}cm$
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