Home
Class 11
CHEMISTRY
Several blocks of magnesium are fixed to...

Several blocks of magnesium are fixed to the bottom of a ship to

A

keep away the sharks

B

prevent rusting of iron ships

C

make the ship lighter

D

prevent punturing by under sea rocks

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ALKALI AND ALKALINE EARTH METALS

    SURA PUBLICATION|Exercise ADDITIONAL SHORT ANSWER|67 Videos
  • ALKALI AND ALKALINE EARTH METALS

    SURA PUBLICATION|Exercise ADDITIONAL LONG ANSWER|22 Videos
  • ALKALI AND ALKALINE EARTH METALS

    SURA PUBLICATION|Exercise ADDITIONAL LONG ANSWER|22 Videos
  • BASIC CONCEPTS OF CHEMISTRY AND CHEMICAL CALCULATIONS

    SURA PUBLICATION|Exercise REDOX REACTION ACTIVITY|35 Videos

Similar Questions

Explore conceptually related problems

A cubical block of wood of edge 3 cm floats in water. The lower surface of the cube just touches the free end of a vertical spring fixed at the bottom of the pot. Find the maximum weight that can be put on the block without wetting it. Density of wood = 800 kgm^-3 and spring constant of the spring =50Nm^-1 Take g=10ms^-2 . ,

A wooden blocks is taken to the bottom of a deep column lake of watre and then released it rises up with a

Figure shows a spring fixed at the bottom end of an incline of inclination 37^0 . A small block of mass 2 kg starts slipping down the incline from a point 4.8 m away from the spring. The block compresses the spring by 20 cm, stops momentarily and then rebounds through a distance of 1 m up the incline. Find a. the frictioin coefficient between the plane and the block and b. the spring constant of the spring. Take g=10 m/s^2 .

A ship in a sea sends SONAR waves straight down into the seawater from the bottom of the ship. The signal reflects from the deep bottom bed rock and returns to the ship after 3.5 s. After the ship moves to 100 Km it sends another signal which returns back after 2s. Calculate the depth of the sea in each case and also compute the difference in height between two cases.

A block of mass m is kept on a horizontal ruler . The friction coefficient between the ruler and the block is mu . The ruler is fixed at one end the block is at a distance L from the fixed end . The ruler is rotated about the fixed end in the horizontal plane through the fixed end a. What can the maximum angular speed be for which the block does not slip? b. If the angular speed of the ruler is uniform increase from zero at an angular acceleration a at angular speed will the block slip?

SURA PUBLICATION- ALKALI AND ALKALINE EARTH METALS-ADDITIONAL QUESTION ( ADDITIONAL CHOOSE THE CORRECT ANSWER)
  1. By adding gypsum to cement

    Text Solution

    |

  2. Give the correct order of thermal stabiiity of alkaline earth metal ca...

    Text Solution

    |

  3. M+2H2OtoM(OH)2+H2 which among the following metals does not undergo ...

    Text Solution

    |

  4. Assertion : The fluorides of alkaline earth metals are almost insolubl...

    Text Solution

    |

  5. Which is insoluble in water?

    Text Solution

    |

  6. The correct statements is / are : (i) BeCl2 is a covalent compound ...

    Text Solution

    |

  7. In which of the following reactions, MgO is not formed

    Text Solution

    |

  8. Several blocks of magnesium are fixed to the bottom of a ship to

    Text Solution

    |

  9. Identify the correct statement

    Text Solution

    |

  10. The metals X and Y that form oxide and nitride , when burnt in air are

    Text Solution

    |

  11. Alkali metal are reactive.

    Text Solution

    |

  12. Spodumene is the silicate mineral of

    Text Solution

    |

  13. Which of the following is incorrect ?

    Text Solution

    |

  14. Monovalent cations having stable electronic configurations similar to ...

    Text Solution

    |

  15. Lithium directly reacts with carbon to form the ionic compound

    Text Solution

    |

  16. The coolant used in fast breeder reactor is .

    Text Solution

    |

  17. Except halides, all the other halides of alkaline earth metals are io...

    Text Solution

    |

  18. Which is the correct statement about sodium chloride?

    Text Solution

    |

  19. The atomic and inoic radii and alkaline earth metals are than the cor...

    Text Solution

    |

  20. Which is known as a natural insulator?

    Text Solution

    |