Home
Class 11
PHYSICS
(A): The bridges declared unsafe after a...

(A): The bridges declared unsafe after a long use.
(R) : Elastic strength of bridges losses with time due to elastic fatigue.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • MECHANICAL PROPERTIES OF SOLIDS

    AAKASH SERIES|Exercise EXERCISE IB (ASSERTION (A) AND REASON ( R) TYPE QUESTIONS (BULK MODULUS; RIGIDITY MODULUS; STRAIN ENERGY; POISSION.S RATIO))|12 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    AAKASH SERIES|Exercise EXERCISE - 2 (YOUNG.S MODULUS)|33 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    AAKASH SERIES|Exercise EXERCISE -IA (ASCENDING OR DESCENDING ORDER)|4 Videos

  • MECHANICAL PROPERTIES OF FLUIDS

    AAKASH SERIES|Exercise EXERCISE-3|43 Videos

  • MOTION IN A PLANE

    AAKASH SERIES|Exercise Practice Exercise|84 Videos

Similar Questions

Explore conceptually related problems

(A) Vulcanised Rubber suits industry than natural Rubber. (R) Elastic properties of Rubber can be reduced due to vulcanization.

(A): Spring balances show wrong readings after they has been used for a long time (R): On using for a long time, spring balances loose its elastic strength

Natural rubber or raw rubber consists of basic material latex which is a dispersion of isoprene. Natural rubber can treatment this isoprene polymers to form a high molecular weight polymer of isoprene. Natural rubber can be obtained from five hundred different species of plants. (i) Tensile strength of vulcanized rubber is almost ten times more than raw rubber. (ii) Elasticity of raw rubber is very high.

(A): A medium must have elasticity to support wave motion. (R): Restoring force responsible for wave motion results due to elasticity of the medium.

Four rods A, B, C and D of the same length and material but of different radii r, r sqrt(2),r sqrt(3) and 2r respectively are held between two rigid walls. The temperature of all rods is increased through the same range. If the rods donot bend, then a) The stress in the rods A, B, C and D are in the ratio 1:2:3:4 b) The forces on them exerted by the wall are in the ratio 1:2:3:4 c) The energy stored in the rods are due to elasticity are in the ratio 1:2:3:4 d) The strains produced in the rods are in the ratio 1:2:3:4

(A) : With increase in temperature, elastic property of a substance decreases (R): Elasticity is due to intermolecular forces which decrease with increase of intermolecular distance

Assertion (A) Ductile metals are used to prepare thin wires. Reason (R) In the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

(A) Honey has been used for a long time as an instant source of energy by vaids in ayurvedic medicine. (R) If the body needs glucose, enzymes break the glycogen down to glucose.

AAKASH SERIES-MECHANICAL PROPERTIES OF SOLIDS-EXERCISE IB (ASSERTION (A) AND REASON ( R) TYPE QUESTIONS (STRESS; STRAIN ; ELASTICITY; YOUNGS MODULUS))
  1. (A): Silver is a ductile material (R): For a ductile material yie...

    Text Solution

    |

  2. (A): Strain is a unitless quantity. (R): Strain is equivalent to fo...

    Text Solution

    |

  3. (A): The bridges declared unsafe after a long use. (R) : Elastic s...

    Text Solution

    |

  4. (A): Two identical solid balls, one of ivory and the other of wet-clay...

    Text Solution

    |

  5. (A) : Young's modulus for a perfectly plastic body is zero. (R): ...

    Text Solution

    |

  6. (A): Force constant K = (YA)/(l) where Y is Young's modulus. A is Area...

    Text Solution

    |

  7. (A): A wire may be stiffer than another wire B. But B may stronger tha...

    Text Solution

    |

  8. (A) : Wet clay does not regain its shape (R) : Young's modulus for...

    Text Solution

    |

  9. (A): Two rods of same material but of different lengths are fixed betw...

    Text Solution

    |

  10. (A): Metals have larger values of Young's modulus than its alloys (...

    Text Solution

    |

  11. (A) : With increase in temperature, elastic property of a substance de...

    Text Solution

    |

  12. (A): Elastic restoring forces may be conservative. (R): The value ...

    Text Solution

    |

  13. (A): Spring balances show wrong readings after they has been used for ...

    Text Solution

    |

  14. (A): A load bearing bar is usually constructed in 'I' shape. (R):...

    Text Solution

    |

  15. (A): Solids are least compressible. (R) : There is tight coupling b...

    Text Solution

    |

  16. (A) : Rubber is an elastomer. (R) : Stress-strain curve of rubber ...

    Text Solution

    |

  17. (A) : Steel is preferred than aluminium in heavy-duty machines (R...

    Text Solution

    |

  18. (A): If radius of a sphere attached to a wire is doubled, elongation o...

    Text Solution

    |

  19. (A) : Tissue of aorta is an elastomer. (R) : Strain-stress curve i...

    Text Solution

    |

  20. (A): Elastomers does not obey Hooke's law. (R): For elastomers, s...

    Text Solution

    |