Science

 ARMY PUBLIC SCHOOL, UDHAMPUR

CYCLE TEST 6

SUBJECT : SCIENCE

CLASS VIII

MM. 10

1. Name the scientist who proved that air pressure has greatest force that even eight horses on each side of two hollow hemispheres could not separate it, which were joined together with the help of vacuum created between the hemispheres. 

a. Alexander Fleming        

b. Otto V. Guericke       

c. William Nicholson                            

d. Michael Faraday   (1)                                   

2. The weight of air in a column of unit area is called as

a. Force    

b. Liquid pressure

c. Atmospheric pressure     

d. Perpendicular force (1) 


3. What do you mean by pressure?                   (1) 

4. If at sea level, the weight of air column above our head is approximately equal to the mass of object 225 kg, then why don’t we get crushed under this weight?  Does the weight of air column decreases or increases as we move towards high altitudes? (1.5+0.5) 

5. Explain how does the water gets filled in the dropper when we press it’s bulb in the water. Is it similar to when we suck water from the straw?                         (1.5+0.5) 

6. Give reasons for the following:           (1+1+1) 

a. Fountains of water come out of the leaking joints or holes in the pipes supplying water. 

b. It is easier to cut with a sharp knife rather than a blunt knife. 

c. When we press the sucker on the surface it sticks to it and becomes very difficult to pull it out of the surface. 


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