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A man of height 'h' is walking away from...

A man of height 'h' is walking away from a street lamp with a constant speed 'v'. The height of the street lamp is 3h. The rate at which the length of the man's shadow is increasing when he is at a distance 10 h from the base of the street lamp is

A

2v

B

v

C

v/2

D

v/3

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KVPY PREVIOUS YEAR-MOCK TEST 1-EXERCISE
  1. A light cylindrical vessel is kept on a horizontal surface it's base a...

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  2. A solid sphere of radius R(1) and volume charge density rho = (rho(0))...

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  3. A man of height 'h' is walking away from a street lamp with a constant...

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  4. An a.c. source of angular frequency omega is fed across a resistor R a...

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  5. A thin spherical shell of radius R lying on a rough horizontal surface...

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  6. Two long cylindrical metal tubes stand on insulating floor. A dielectr...

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  7. A single slit of width a is illuminated by violet light of wavelength ...

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  8. A jumper of mass m and length l is placed on two prabolic rails in x-y...

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  9. A torsional pendulum consists of a solid disc connected to a thin wire...

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  10. A bar magnet suspended at a place P where dip angle is 60^@ gives 10 o...

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  11. A chain of length l is placed on a smooth spherical surface of radius ...

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  12. A star initially has 10^40 deuterons. It produces energy via the proce...

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  13. A rod of length l is pivoted about a horizontal , frictionless pin thr...

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  14. In the circuit given below, V(t) is the sinusoidal voltage source, vol...

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  15. A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if...

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  16. An artificial satelite of the moon revolves in a circular orbit whose ...

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  17. A body falling freely from a given height H hits an inlclined plane in...

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  18. In the arrangement shown, a block (of mass m) is being moved up agains...

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  19. For an ideal gas the molar heat capacity varies as C=CV+3aT^2. Find th...

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  20. A 4 muF capacitor, a resistance of 2.5 M Omega is in series with 12V b...

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