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Jumat, 16 Desember 2011

contoh soal fisika rsbi smp kelas 8 semester 1

PHYSICS PROBLEMS
1.      1. Observe the following properties :
          (1).cannot be devided into its smallest part
            (2).consist of two kinds of substance
            (3).has negative electric charge
       The properti(ies) of ion is (are)..
a.       1
b.      2
c.       3
d.      1 and 2
NO
Substance
Chemical Formula
1
Oxygen
O2
2
Carbon
C
3
Water
H2O
4
Hydrogen
H2
      2. The element molecule  and element are...
a.       1 and 2
b.      2 and 3
c.       2 and 4
d.      4
3.                       3.   Which one is the property of a compound ?
a.        It has the same number  of electron
b.      It has different properties from its contituent element
c.       It has different number of electron
d.      It has the same properties as its constituent element
      4   Based on the graph aboe, the distance coered in two second is...
a.       16 m                        v (ms -1)             
b.      17m
c.       20m                                                                         t (s)
d.      4m                                                  2            10
     5.Based on the graph aboe the acceleration of the object is..
a.       20 m/s2                                                        
b.      10 m/s2                                                     10
c.       5m/s2                                                           5
d.      15m/s2                                               1   2
6. Some racers are riding their bikes in a qualification race.The following table shows the qualification data of  one of the bikes.
No
Initial velocity (ms -1)
Final Velocity (ms -1)
Time (S)
1
20
18
1
2
30
26
2
3
40
34
3
  

The decleration of the bikes is...


a.       10 ms -2
b.      2 ms -2
c.       5 ms -2
d.      7 ms -2
   7. Based on the graph above, the magnitude of declaration is....
                        a. 3 ms -2                                                             18    
                        b. 2 ms -2                                       14
                        c. 6 ms -2                                       10
                        d.1 ms -2                                                   4     6                          
                   8. Study the table below.
No
Properties
1
Distance between two points
2
Something that express quantity
3
Degree of hotness and coldness of an object
4
Ability to do work
a.       1 and 4
b.      1
c.       4
d.      2 and 3
9.    The box moves 3 meter to the left.
                      How much work is done by the people ?
a.       203 Joule                                                   F = 200 N                                                                          
b.      700 Joule
c.       7000 Joule
d.       6.6 Joule

10.  A tin plate is on thr second floor a house. The mass of the plate is 2,0 kg, what is the potential    energy of the tin plane ? ( g = 10 ms-2 )
a.       20 joules
b.      200 joules                                                                                               tin plate
c.       400 joules
d.      40 joules                                                                             10 m
11. A car is moving on the street. The car movingnwith a constant. The speed of the caris 10 ms-1 and its mass is 1000 kg. What is the kinetik ennergy of the car ?
a.       200,000 J
b.      100,000 J
c.       20,000 J
d.      10,000 J
12. Study the graph below
                                                                          Based on the graph beside the magnitude of the mechanical                   energy is....
           200                                                a. 1400 J                                    c.   1000 J
                                                       b.     500 J                                   d. 900 J
                                300              700              
                                                                                                                                                                                   

 13. Based on the figure on the right what is the right
       ideal mechanical advantage of the scissors ?                                   10 cm   
a.       1 times                                                                              30 cm
b.      2 times
c.       3 times
d.      3.3 times
14.

                                             2.5 m
                                     1 m
                  
Look at the figure above.
A box is moved by using a ramp.One box is 25 kg and g =10 ms-2.What is the minimum force needed to lift up one box through the ramp ?
a.       200 N
b.      100 N
c.       500 N
d.      125 N
             15.                                                             Look at the figure on the left.
                                                                What is the ideal mechanical advantage of the pulley system on the
                                                                left?
a.       1
b.      2
c.       3
d.      4




16. Observe the following figure.
No
Phenomenon
1
A comet moves periodically
2
A car is braked, so that is stops
3
Weight of a body on the polar is bigger then its weight on the equator
4
Astronuot’s weight on the moon is smaller than his weight on the earth
                     The phenomenon that shows newton’s First Law is....
a.       1
b.      2
c.       3
d.      4
17. Observe the follo2wing figure.
                    (1)                                                 (2)



             V1 = 4 m.s -1                                    V2 = 10 m.s -1
A trolley is moving for 3 second as shown on the figure above. If the mass the trolley is 5 kg, the force that acts on the trolley is...
a.       23 N
b.      66 N
c.       10 N
d.      20 N
18. which one is the correct pair of action –reaction forces ?                          N
a.       F1  and  F2
b.      F1 and N                                                                           F1                                                                                   F2
c.       F2 and A                                                      
d.      F1 and A
19. The resultant force as shown in the figure is....                                           A
a.       5 N
b.      35 N                                                                                           20 N
c.       40 N
d.      45N                                                                                     15 N
20. The resultant force is shown in the figure is....                        
a.       2 N                                                                                    18N            20 N 
b.      -2 N
c.       38 N
d.      -38 N
21. The children’s has played tug of war. Andi pulling the rope to the right with 150 N to the right. Aji                          pulling the rope with 125 N to the left, what’s resultant force?
a.       275 N to the right
b.      275 N to the left
c.       25 N to the right
d.      25 N to the left
22.  A force exerted  on a nail.The magnitude of the force is 20 N.
                                                            Hammer


                              Nail                                                    surface area = 0.1 cm2


                                     Wood
The pressure on wood is...
a.       2,000 Nm-2
b.      20,000 Nm-2
c.       200,000 Nm-2
d.      2,000,000 Nm-2
        23.Observe the following table
No
Magnitude of force(N)
Contact Area(m2)
1
10
0,5
2
15
2,5
3
5
0,5
4
100
5
The same magnitude of pressure in the table aove are shown by number ..
a.       1 and 2
b.      1 and 4
c.       2 and 3
d.      3 and 4
Can:  B 
24. Some water is poured into a jar.The density of the water  is 1000 kg-3  and the acceleration due to gravity is 10 m-2.



                                                                                40 cm



                                                                              10 cm
                                                                               0 cm

What is the hidrostatik pressure at point  B ?
a.       500 Nm  -2
b.      2000 Nm -2
c.       1500 Nm -2
d.      1000 Nm -2



25.
                              A                          
                                             C                                                     B
                                                D
                Baswd on the figure, which point has the lowest pressure ?
a.       A
b.      B
c.       C
d.      D
26. Water is poured into a compartment the density of water is 1000 kgm -3. Then a wooder block is put into it the volume of the wooden block is 100 cm3 (g = 10 ms-2). What is the bouyancy force that acting at the block?
a.       1.5 N
b.      1.0 N
c.       30 N
d.      10 N
27. observe the following figure !
                         F1 = 250                                         F2
                                                      A1 = 10 cm2                                              A2 =  30 cm2

                                                                                                                               
                  The magnitude of F2 is....
a.       675 N
b.      400 N
c.       375 N
d.      385 N
28. The volume of piston was 150 cm3. The air pressure in the piston was 3 Pa. Then, we copress it.      Its volume becomes 25 cm3. Now the air pressure in the piston is.....
a.       19 Pa
b.      18 Pa
c.       20 Pa
d.      8 Pa
29. The high of a town is 500 m above sea level. The atmospheric in this town is.....
a.       72 cmHg
b.      70 cmHg
c.       60 cmHg
d.      65 cmHg
30. The atmospheric pressure in of a montain is 50 cmHg. Its height is.... above sea level
a.       2700 m
b.      490 m
c.       2600 m
d.      260 m
                                                                                                                                

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