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The work done in increasing the size of ...

The work done in increasing the size of a rectangular soap film with dimensions 8 cm x 3.75 cm to 10 cm x 6 cm is `2 xx 10^(-4) J`. The surface tension of the film in `(N m^(-1))` is

A

`1.65xx10^(-2)`

B

`3.3xx10^(-2)`

C

`6.6xx10^(-2)`

D

`8.25xx10^(-2)`

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The correct Answer is:
B
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NCERT FINGERTIPS-PRACTICE PAPERS-Practice Paper 3
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  2. A spherical soap bubble of radius 1 cm is formed inside another of rad...

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  3. A spherical metal ball of mass m and radius (r ) is falling through a ...

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  4. A vessel contains a mixtrue consisting of m(1) = 7g of nitrogen M(1) =...

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  5. Two thermally insulated vessel 1 and 2 are filled with air at temperat...

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  6. A steel metre scale is to be ruled so that the millimetre intervals ar...

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  7. What is the relationship between time of flight T and horizontal range...

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  8. The disc of a siren revolves 600 times in one minute and it is in unis...

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  9. Which of the following is dimensionless?

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  10. Given vecF=(4hati-10hatj)and vecr=(5hati-3hatj). then torque vectau is

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  11. A man throws balls with the same speed vertically upwards one after th...

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  12. In uniform circular motion

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  13. A ball is rolled off along the edge of the table (horizontal ) with ve...

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  14. Three masses of 1kg, 6 kg and 3 kg are connected to each other with th...

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  15. A liquid of density rho flows along a horizontal pipe of uniform cross...

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  16. A chain of uniform mass m and length L is held on a frictionless table...

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  17. For the same total mass, which of the following will have the largest ...

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  18. Kepler's second law is based on

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  19. A spaceship is launched into a circular orbit close to the Earth's sur...

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  20. A hole is drilled in a copper sheet. The diameter of the hole is 4.24 ...

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  21. Two blocks M1 and M2 having equal masses are to move on a horizontal f...

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