Sonic booms’ refer to:

Related Mcqs:

1. To check sonic booms, control should be exerted over:

   A. Traffic on high ways
   B. Sirens of every kind
   C. Air traffic directions
   D. Noise producing devices

2. Plant associations refer:

   A. A group or community of plants living together in common habitat
   B. A group may include different species of plants, belonging to different families
   C. Both (a) & (b)
   D. None of these

3. Besides dung, the weed that can be used in biogas production is:

   A. Eichhornia crassipes
   B. Solanum nigrum
   C. Hydrilla
   D. Parthenium hysterophorus
   E. All of these

4. What is the intensity of sound in normal conversation?

   A. 10-20 dB
   B. 40-60 dB
   C. 90-12 dB
   D. 120-150 dB

5. Which of the following isotopes is most dangerous to Homo sapiens?

   A. P32
   B. Sr90
   C. Cs137
   D. I131

6. Most harmful heavy metals causing water pollution:

   A. Pb, Hg, Cr, Cd
   B. P,Mn,B,Mg
   C. N,K,Mo
   D. Zn,Mo,Mg,Ag

7. The atmospheric UV radiations are absorbed in the zone called:

   A. Troposphere
   B. Stratosphere
   C. Mesosphere
   D. Thermosphere

8. The presence of O3 in atmosphere of earth:

   A. Has been responsible for increasing the average global temperature in recent
   B. Is advantageous since it supplies O2 for people travelling in jets
   C. Hinders higher rate of photosynthesis
   D. Helps in checking the penetration of ultra violet rays to earth

9. Exposure of plants to high fluoride concentration results in necrosis or chlorosis characteristics in:

   A. Petiole but not in lamina
   B. Only mid rib of lamina
   C. Leaf tip and leaf margin
   D. Stems tips only

10. Air pollution is not caused by:

    A. Thermal power plant
    B. Diesel engine
    C. Hydroelectric power station
    D. Pollen grain