PHYSICS. 2. As, we know that pressure is defined as the force acting on a unit area of a surface, then force pressure area
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1 . Rolling Friction PHYSICS The force of friction which comes into play when a body rolls over the surface of another body is called rolling friction, e.g. when a wheel rolls over a road, the rolling friction comes into play. The direction of rolling friction is opposite to the direction of turning of wheels. The rolling friction is less than the sliding friction. Sliding Friction When one body slides over the surface of other, the resistance to its motion is called sliding friction. The force required to keep the object moving with the same speed is a measure of sliding friction. In the above example, if the boy apply some more pushing force on the box, the box will start sliding on the surface and the friction between the surfaces is called sliding friction.. As, we know that pressure is defined as the force acting on a unit area of a surface, then force pressure area F p A p A So, according to formula, pressure is inversely proportional to the area on which force is applied. Therefore with the decrease in area the pressure increase.. We know :- P = h g Given P = h g h 76 0 m 600 kg / m g 0 m / s Pa.0 0 Pa 4. The two methods to reduce friction are (i) Drops of oil are poured on the hinges of a door to move the door smoothly. (ii) Fine powder are sprinkled on the carom board to reduce friction.. Angle of friction () f R mg R N F Monthly Test l July -08 l Class-8 (Solution)
2 The angle of friction between any two surface in contact is defined as the angle which the resultant of the force of limiting friction force F and normal Reaction (N) makes with the direction of normal Reaction (N) Angle of Repose : Is defined as the minimum angle of inclination of a plane with the horizontal, such that a body placed on the plane. Just begins to slide down the Incline. 6. (a) (i) Gravity, Friction (b) Repell (c) Pressure (d) Push (e) Relative motion (f) More. Lead. Sodium & Potassium. (a) Magnesium (b) Iron 4. (a) True (b) False. Gold & Silver. 6. (a), 4 (b) CHEMISTRY 7. (a) The property of metals by which they can be beaten into thin sheets is called malleability. Example:- Aluminium (b) The property of metals by which they can be drawn into wires is called ductility. Example:- Silver 8. (a) Metal (b) Conductor 9. (a) Total number of electron in HO 8 0 (b) Total number of electron in CO 6 8 BIOLOGY. Manure improves the texture to soil, provide humus, improves the water holding capacity of soil and makes the soil porous, enhances the growth of microorganism.. Protozoal disease and is spread by Tse tse fly.. Small pox has been completely eradicated from India and Polio is eliminated. 4. Louise pasteure and the year is 87.. Vaccine in our body works by action of lymphocytes cells specially T-lymphocytes by making antibodies.,it is mediated by Killer,Memory and Helper T cells. 6. It will not grow properly. Due to excess water plant may die and reduces the crop production. Lactobacillus, Rhizobium, propianibacterium etc. 7. Rhizobium, Nitrobacter, Azotobacter. Monthly Test l July -08 l Class-8 (Solution)
3 8. Antibiotics are the chemical substance that kill or stop the growth of microbes (Bacteria) and are derived from same microorganism. Tetracyclin, Chloroamphenicol. Terramicin, Ampicilline etc Additive inverse of 4 6. Usual form of is Prime factorization of 6 is : 6 = = 0 x y z 0 xyz 0 x y z 00 x y z x y z x 4 x 9 9x = 4 (x + ) 9x = 4x + 60 MATHEMATICS 60 9x 4x = 60 x = 60 x 6. Let x be the required number. 4x x 4 4x x x x 4 x = 80 0 required number is Monthly Test l July -08 l Class-8 (Solution)
4 7. 89 = It is clear that in order to get a perfect cube, = 4 must be multiplied to = x x x x x 4 x 4 x 4 x x x 7x x x 7x 6x x x 8x 0x 4 6x 4x 0x x 7x 6x x x 8x 0x 4 6x 4x 0x x 7x 4x 40x =.7 to decimal places x 6 6 x 6 x reciprocal of x 9 m m 9 9 m m n mn m a a and a m n m n a a a m a 4 Monthly Test l July -08 l Class-8 (Solution)
5 m = 4m 4m = 8 m = x x x x x x x x 0 x x x x 0 x x 4 Divisor Quotient + Remainder = x x x 4 x x x x x 4 m a b b a x x x Divisor Hence, verified and Now, Let the number of ` 0 notes be x. Then the number of ` 0 notes = 0 x Total value of ` 0 notes = 0 x = ` 0x and total value of ` 0 notes = 0 (0 x) = ` (000 0x) According to question: 0x x = 800 0x = 00 x = 0 Number of 0 rupee notes = 0 and number of 0 rupee notes = 0 0 = 0 m. (i) Indians ENGLISH (School) Monthly Test l July -08 l Class-8 (Solution)
6 (ii) talkative persons (iii) she was afraid that if each lady decided to go on her independent trip the original schedule would be seriously affected (iv) she was born there and wanted to see her ancestral home (v) she was surprised to see the beauty of Islamabad. (A) No other place in India is as hot as the Thar desert. (B) She is the most beautiful woman in the beauty pageant.. (A) Senior (B) Next (C) Suitable (D) Latter (E) Last 4. (A) Achievement (B) Appearance (C) Collection (D) Application. (A) Suraj proper (B) Record common (C) Wisdom abstract (D) Water material 6. (A) Reflexive (B) Relative (C) Distributive (D) Demonstrative 7. (A) Meadow (B) (C) mown mead Alliteration He enjoys himself wholeheartedly during summers when all other living beings are troubled by heat. (D) John Keats 8. (A) It turned out to be fortunate because now people began to bribe the mother to see the son s nose. The income of the long nosed one grew day by day. In six years the poor cook became a millionaire. (B) (C) The reason was that the people living in the house where he worked could find no peace or quiet because of him. People came visiting night and day, photographers and news-reporters pestered and many things were stolen from the house in the process. The birds hide in cooling tress as they are faint with hot sun. 6 Monthly Test l July -08 l Class-8 (Solution)
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