Home
Class 12
BIOLOGY
Polyblend, a fine powder of recycled mod...

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for :  
(A) making plastic sacks
(B) use as a fertilizer
(C) construction of roads
(D) making tubes and pipes

A

making plastic sacks

B

use as a fertilizer

C

construction of roads

D

making tubes and pipes

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    KUMAR PRAKASHAN|Exercise Section - F (Multiple Choice Question (MCQs))(MCQs FROM .DARPAN. BASED ON TEXTBOOK)|208 Videos

  • ECOSYSTEM

    KUMAR PRAKASHAN|Exercise SECTION - F (MCQs ASKED IN COMPETTIVE EXAM)|84 Videos

  • EVOLUTION

    KUMAR PRAKASHAN|Exercise SECTION - F (Multiple Choice Questions)|198 Videos

Similar Questions

Explore conceptually related problems

Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permancnt deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. Material which is good for making wires by stretching is

Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permancnt deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. If you bough a new shoe which bites in the beginning and later on fits perfectly, then the material used to making the shoe is

Figure shows the relationship between tensile stress and strain for a typical material. Below proportional point A, stress is directly proportional to strain which means Young's moudulus (Y) is a constant. In this region the material obeys Hooke's law. Provided the strain is below the yield point 'B' the material returns to its original shape and size when the force is removed. Beyond the yield point, the material retains a permanent deformation after the stress is removed. For stresses beyond the yeld point, the material exhibit plastic flow, which means that it continues to elongate for little increases in the stress. Beyond C a local constriction occurs. The material fractures at D (i.e. breaking point). The graph below shows the stress-strain curve for 4 different materials. Material which is most brittle is

Science, like any knowledge, can be put to good or bad use, depending on the user. Given below are some of the applications of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised : (a) Mass vaccination against small pox to curb and finally eradicate this disease from the population. (This has already been successfully done in India). (b) Television for eradication of illiteracy and for mass communication of news and ideas. (c) Prenatal sex determination (d) Computers for increase in work efficiency (e) Putting artificial satellites into orbits around the Earth (f ) Development of nuclear weapons (g) Development of new and powerful techniques of chemical and biological warfare). (h) Purification of water for drinking (i) Plastic surgery (j ) Cloning

Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common estimate is difficult to obtain, try to get an upper bound on the quantity ): (a) the total mass of rain-bearing clouds over India during the Monsoon (b) the mass of an elephant (c) the wind speed during a strom (d) the number of strands of hair on your head (e) the number of air molecules in your classroom.

Separation of Motion of a system of particles into motion of the centre of mass and motion about the centre of mass : (a) Show p=p_(i).+m_(i)V where p_(i) is the momentum of the ith particle (of mass m_(i) ) and p_(i).=m_(i)v_(i). . Note v_(i). is the velocity of the i^(th) particle relative to the centre of mass Also, prove using the definition of the centre of mass Sigmap_(i).=0 (b) Show K=K.+(1)/(2)MV^(2) where K is the total kinetic energy of the system of particles, K. is the total kinetic energy of the system when the particle velocities are taken with respect to the centre of mass and (1)/(2)MV^(2) is the kinetic energy of the translation of the system as a whole (i.e. of the centre of mass motion of the system). The result has been used in Sec. 7.14). (c ) Show vecL=vecL.+vecRxxvec(MV) where vecL.=Sigmavec(r_(i)).xxvec(p_(i)). is the angular momentum of the system about the centre of mass with velocities taken relative to the centre of mass. Remember vec(r._(i))=vec(r_(i))-vecR , rest of the notation is the velcities taken relative to the centre of mass. Remember vec(r._(i))=vec(r_(i))-vecR rest of the notation is the standard notation used in the chapter. Note vecL , and vec(MR)xxvecV can be said to be angular momenta, respectively, about and of the centre of mass of the system of particles. (d) Show vec(dL.)/(dt)=sumvec(r_(i).)xxvec(dp.)/(dt) Further, show that vec(dL.)/(dt)=tau._(ext) where tau._(ext) is the sum of all external torques acting on the system about the centre of mass. (Hint : Use the definition of centre of mass and Newton.s Thrid Law. Assume the internal forces between any two particles act along the line joining the particles.)

Genetic engineering has been successfully used for producing (A) Transgenic mice for testing safety of polio vaccine before use in humans (B) Transgenic models for studying new treatments for certain cardiac diseases (C) Transgenic cow-Rosie which produces high fat milk for making ghee (D) Animals like bulls for farm work as they have super power.

KUMAR PRAKASHAN-ENVIRONMENTAL ISSUES-Section - F (Multiple Choice Question (MCQs))(MCQs ASKED IN COMPETITIVE EXAM)
  1. Global warming can be controlled by   (A) Reducing deforestation, cut...

    Text Solution

    |

  2. A scrubber in the exhaust of a chemical industrial plant removes (A) ...

    Text Solution

    |

  3. The zone of atmosphere in which the ozone layer is present is called

    Text Solution

    |

  4. The UN conference of Parties on climate change in the year 2012 was he...

    Text Solution

    |

  5. Eutrophication of water bodies leading to killing of fishes is mainly ...

    Text Solution

    |

  6. Acid rain is caused by increase in the atmospheric concentration of  ...

    Text Solution

    |

  7. Which of the following are most suitable indicators of sulphur dioxide...

    Text Solution

    |

  8. Increase in concentration of the toxicant at successive tropic levels ...

    Text Solution

    |

  9. A lake which is rich in organic waste may result in   (A) increased p...

    Text Solution

    |

  10. The highest DDT concentration in aquatic food chain shall occur in

    Text Solution

    |

  11. Depletion of which gas in the atmosphere can lead to an increased inci...

    Text Solution

    |

  12. Which one of the following statements is not valid for aerosols ?   (...

    Text Solution

    |

  13. Match the items given in Column - I with those in Column - II and sele...

    Text Solution

    |

  14. World Ozone Day is celebrated on

    Text Solution

    |

  15. In stratosphere, which of the following elements acts as a catalyst in...

    Text Solution

    |

  16. Which of the following is a secondary pollutant ?

    Text Solution

    |

  17. Which of these following methods is the most suitable for disposal of ...

    Text Solution

    |

  18. Which of the following pairs of gases is mainly responsible for green ...

    Text Solution

    |

  19. Which of the following protocols did aim for reducing emission of chlo...

    Text Solution

    |

  20. Polyblend, a fine powder of recycled modified plastic, has proved to b...

    Text Solution

    |