# The diameter and height of a cylinder are measured by a meter scale to be 12.6±0.1 cm and 34.2±0.1 cm, respectively. What will be the value of its volume in appropriate significant figures? (a) 4260±80 cm3 (b) 4300±80 cm3 (c) 4264.4±81.0 cm3 (d) 4264±82 cm3

## Question ID - 50255 :- The diameter and height of a cylinder are measured by a meter scale to be 12.6±0.1 cm and 34.2±0.1 cm, respectively. What will be the value of its volume in appropriate significant figures? (a) 4260±80 cm3 (b) 4300±80 cm3 (c) 4264.4±81.0 cm3 (d) 4264±82 cm3

3537 =2 + =2 + V=12.6× ×314.2

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 At some location on earth the horizontal component of earth’s magnetic field is 18×10−6 T. At this location, magnetic needle of length 0.12 m and pole strength 1.8 Am is suspended from its mid-point using a thread, it makes 45° angle with horizontal in equilibrium. To keep this needle horizontal, the vertical force that should be applied at one of its ends is: (a) 3.6×10−5 N (b) 6.5×10−5 N (c) 1.3×10−5 N (d) 1.8×10−5 N 