In a vernier calliper, 20 VSD coincide with 16 MSD (each division of length 1 mm ). The least count of the vernier callipers is:
0.2 cm
0.01 cm
0.02 cm
0.1 cm
When a ruler falls vertically, 5 different persons catch it with different reaction times. ( $g=9.8 \mathrm{~m} \mathrm{~s}^{-2}$ )
A. Person A has reaction time of 0.20 s .
B. Person $B$ has reaction time of 0.22 s .
C. Person C has reaction time of 0.18 s .
D. Person D has reaction time of 0.19 s .
E. Person E has reaction time of 0.21 s .
What is the correct order of the distance travelled by the ruler for each person?
B $>$ E $>$ A $>$ C $>$ D
C $>$ D $>$ A $>$ B $>$ E
B $>$ E $>$ A $>$ D $>$ C
C $>$ D $>$ A $>$ E $>$ B
A uniform metallic wire having resistance $4 \Omega$ is bent to form a square loop (ABCD) (see figure). A resistance of $2 \Omega$ is connected between points $B$ and $D$ and a battery of 2 V is connected across points $A$ and $C$ as shown in the figure. Now the value of current $(l)$ is :

2 A
8 A
4.5 A
4 A
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