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The length of a blackboard is 240 cm. Ra...

The length of a blackboard is 240 cm. Rakesh tries to measure this length using a small wooden stick of length 40 cm. The number of times that the stick must be revolved over the blackboard to completely cover the length is

A

6

B

12

C

28

D

24

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Knowledge Check

  • The length of an astronomical telescope is 40 cm. The focal lengths of its lenses will be

    A
    35 cm and -5 cm
    B
    `-35` cm and -5 cm
    C
    35 cm and +5 cm
    D
    `-35` cm and +5 cm

  • The length of a metal wire is 10cm when the tension in it is 20N and 12cm when the tension is 40N . Then natural length of the wire is in cm

    A
    `6`
    B
    `4`
    C
    `8`
    D
    `9`

  • Rahim bought 7 magic sticks, each of length 5 cm 3 mm. What is the total length of all the sticks?

    A
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    B
    5.05 cm
    C
    37 cm 1 mm
    D
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