Atmospheric pressure: barometer, rubber sucker, bicycle tube

1. 1What is atmosphere? [blank_start]From the surface of the earth up to 800[blank_end] [blank_start]km air layer is there which is called[blank_end] [blank_start]atmosphere.[blank_end]

   1. AFrom the surface of the earth up to 800
   2. Bkm air layer is there which is called
   3. Catmosphere.
2. 2What is the pressure of air at sea level? [blank_start]9.8N is the pressure of air at sea level[blank_end].

   1. A9.8N is the pressure of air at sea level
3. 3What is the use of barometer ? [blank_start]Instrument used to measure air-pressure[blank_end] [blank_start]is called Barometer.[blank_end]

   1. AInstrument used to measure air-pressure
   2. Bis called Barometer.
4. 4How is the air pressure in the inflated balloon as compared to atmospheric pressure? [blank_start]The air pressure in the inflated balloon[blank_end] [blank_start]is more as compared to atmospheric[blank_end] [blank_start]pressure[blank_end].

   1. AThe air pressure in the inflated balloon
   2. Bis more as compared to atmospheric
   3. Cpressure
5. 5State a unit to measure atmospheric pressure. [blank_start]The unit to measure air pressure is bar[blank_end].

   1. AThe unit to measure air pressure is bar
6. 6A rubber sucker is released after pressing it on a smooth glass. it sticks to the glass. What is the reason for this? [blank_start]When air-absorber rubber is pressed the[blank_end] [blank_start]air comes out, so pressure inside the[blank_end] [blank_start]air-absorber decreases while the outer[blank_end] [blank_start]air-pressure is more[blank_end].

   1. AWhen air-absorber rubber is pressed the
   2. Bair comes out, so pressure inside the
   3. Cair-absorber decreases while the outer
   4. Dair-pressure is more
7. 7Why does the bicycle tube bursts, if excess of air is filled to it? [blank_start]If excess of air is filled in a bicycle[blank_end] [blank_start]tube, then due to expansion the inner[blank_end] [blank_start]walls of bicycle tube becomes weak. So[blank_end] [blank_start]bicycle tube bursts.[blank_end]

   1. AIf excess of air is filled in a bicycle
   2. Btube, then due to expansion the inner
   3. Cwalls of bicycle tube becomes weak. So
   4. Dbicycle tube bursts.
8. 8What is the work of the valve tube in the bicycle tube? [blank_start]The valve tube is specially designed.[blank_end] [blank_start]So that the air easily enters the tube[blank_end] [blank_start]through valve, but the small tube in the[blank_end] [blank_start]valve tube prevents the air coming out[blank_end].

   1. AThe valve tube is specially designed.
   2. BSo that the air easily enters the tube
   3. Cthrough valve, but the small tube in the
   4. Dvalve tube prevents the air coming out
9. 9Where do you use air pressure in your day-to-day life? Give four examples. [blank_start]We use air pressure in our day-to-day[blank_end] [blank_start]life. Examples are 1) To fill ink in pen[blank_end] [blank_start]with the help of ink filler 2) To drink[blank_end] [blank_start]cold drinks with the help of straw 3) To[blank_end] [blank_start]fill air in bicycle tube with the help[blank_end] [blank_start]of cycle pump 4) To spray water by using[blank_end] [blank_start]water gun.[blank_end]

   1. AWe use air pressure in our day-to-day
   2. Blife. Examples are 1) To fill ink in pen
   3. Cwith the help of ink filler 2) To drink
   4. Dcold drinks with the help of straw 3) To
   5. Efill air in bicycle tube with the help
   6. Fof cycle pump 4) To spray water by using
   7. Gwater gun.
10. 10Close the front part of the syringe without needle. Push the knob with thumb. What do you experience? Give reason. [blank_start]We are not able to press the knob of[blank_end] [blank_start]syringe, because of air inside the[blank_end] [blank_start]syringe[blank_end].

    1. AWe are not able to press the knob of
    2. Bsyringe, because of air inside the
    3. Csyringe

11. 11Give four names of devices working on air pressure. [blank_start]Air absorber rubber cork, Ink filler,[blank_end] [blank_start]Hand pump, Cycle pump[blank_end]

    1. AAir absorber rubber cork, Ink filler,
    2. BHand pump, Cycle pump
12. 12We are not crushed through there is great pressure of air in our surrounding. [blank_start]There is air in our body. The pressure[blank_end] [blank_start]of air inside our body and in[blank_end] [blank_start]surrounding is balanced so we are not[blank_end] [blank_start]crushed[blank_end].
    

    1. AThere is air in our body. The pressure
    2. Bof air inside our body and in
    3. Csurrounding is balanced so we are not
    4. Dcrushed

Descripción

Primary Science 1 Test sobre Sin título, creado por Gopal Kumawat el 11/06/2016.

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Gopal Kumawat

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