Home
Class 11
PHYSICS
A barometer kept in an elevator reads 76...

A barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, the reading will be

A

zero

B

76 cm

C

` gt 76 cm`

D

`lt 76 cm`

Text Solution

Verified by Experts

The correct Answer is:
D
Initially `p_(0)A` supports the weight of mercury column. While in second case it provides acceleration too.
Promotional Banner

Topper's Solved these Questions

  • FLUID MECHANICS

    DC PANDEY ENGLISH|Exercise B) Medical entrance special format question|19 Videos

  • FLUID MECHANICS

    DC PANDEY ENGLISH|Exercise Match the columns|6 Videos

  • FLUID MECHANICS

    DC PANDEY ENGLISH|Exercise Check point 13.4|10 Videos

  • EXPERIMENTS

    DC PANDEY ENGLISH|Exercise Subjective|15 Videos

  • GENERAL PHYSICS

    DC PANDEY ENGLISH|Exercise INTEGER_TYPE|2 Videos

Similar Questions

Explore conceptually related problems

A barometer kept in an elevator accelerating upward reads 76 cm. The air pressure in the elevator is

A barometer kept in a stationary elevator reads 76 cm . If the element starts accelerating up the reading will be

If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be - (a) going up with increasing speed ( b) going down with increasing speed ( c) going up with uniform speed ( d) going down with uniform speed

A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately

A pendulum bobof masss 50 g is suspended from the ceiling of an elevator. Find the tension in the string if the elevator a. goes up with acceleration 1.2 m/s^2 , b. goes up with deceleration 1.2 m/s^2 , c. goes up with uniform velocity, d. goes down with acceleration 1.2 m/s^2 e. goes down with deceleration 1.2 m/s^2 and f. goes downwith uniform velocity.

A collision experiment is done on a horizontal table kept in an elevator. Do you expect a change in the results if the elevator is accelerated up or down because of the noninertial character of the frame?

A block of mass m kg is kept on a weighing machine in an elevator. If the elevator is retarding upward by a ms^(-2) , the reading of weighing machine is (in kgf)

An object is suspended from a spring balance in a lift. The reading is 240 N when the lift is at rest. If the spring balance reading now change to 220N, then the lift is moving

A barometer is faulty . When the true barometer reading are 73 cm and 75 cm of Hg , the faulty barometer reads 69 cm and 70 cm respectively (i) What is the total length of the barometer tube? (ii) What is the reading when the faulty barometer reads 69.5 cm? (iii) What is the faulty barometer reading when the true barometer reads 74 cm?

The total mass of an elevator with a 80 kg man in it is 1000 kg. This elevator moving upward with a speed of 8 m//sec, is brought to rest over a distance of 16m. The tension T in the cables supporting the elevator and the force exerted on the man by the elevator floor will respectively be-

DC PANDEY ENGLISH-FLUID MECHANICS-Taking it together
  1. A wooden block of mass 8 kg is tied to a string attached to the bottom...

    Text Solution

    |

  2. A metal ball immersed in alcohol weighs w(1) " at" 0^(@)C " and" w(2) ...

    Text Solution

    |

  3. A barometer kept in an elevator reads 76 cm when it is at rest. If the...

    Text Solution

    |

  4. The surface energy of a liquid drop is E. It is sprayed into 1000 equa...

    Text Solution

    |

  5. An open tank containing non-viscous liquid to a height of 5 m is place...

    Text Solution

    |

  6. A large open tank has two holes in the wall. One is a square hole of s...

    Text Solution

    |

  7. A piece of steel has a weight w in air, w(1) when completely immersed ...

    Text Solution

    |

  8. Two cylinders of same cross-section and length L but made of two diffe...

    Text Solution

    |

  9. A block of wood is floating on the surface of water in a beaker. The b...

    Text Solution

    |

  10. A beaker containing water is kept on a spring scale. The mass of water...

    Text Solution

    |

  11. A sphere of solid material of specific gravity 8 has a concentric sphe...

    Text Solution

    |

  12. A cubical block of side 10 cm floats at the interface of an oil and wa...

    Text Solution

    |

  13. A liquid stands at the plane level in the U-tube when at rest. If area...

    Text Solution

    |

  14. A capillary tube is dipped in a liquid. Let pressure at point A,B and ...

    Text Solution

    |

  15. The volume of an air bubble becomes three times as it rises from the b...

    Text Solution

    |

  16. Water falls from a tap with A(0)=4 m^(2), A=1 m^(2) and h=2 m, then ve...

    Text Solution

    |

  17. A ball of relative density 0.8 falls into water from a height of 2 m. ...

    Text Solution

    |

  18. A pump is designed as a horizontal cylinder with a piston of area A an...

    Text Solution

    |

  19. If cross- sectional area of limb I is A(1) and that of limb II is A(2)...

    Text Solution

    |

  20. Two capillaries of same length and radii in the ratio 1:2 are connecte...

    Text Solution

    |