Standard 8 - Physics - Answer key

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Standard 8 Physics Answer key

1. Displacement (1)
2. c. For a constant applied force the pressure increases when the surface area decreases.(1)
3. 15 cm (1)
4. a. Pascal OR N/m² (1)
   b. Vector (1)
5. a. No., The internal force doesn't move the body. (1)
   b. Unbalanced External Force (1)
6. Balanced Force - b, c
   Unbalanced Force – a, d (2)
7. N S N S N S
   N S N S N S (1)

b. 2 (1)

8. a. Torch cells, Insulated copper wire, Nail etc. (1)
   b. Wind the insulated copper wire over the nail and connect it to the battery (1)
9. a. 100 N (1)
   b. 100/.25 = 400 N/ m² (1)
   c. Vertically(the area of contact will be minimum) (1)
10. a. Inertia of Motion (1)
    b. The iron ball.
    when the mass increases inertia increases. (2)
11. a. Magnetic Induction (1)
    b. South(s) (1)
    c. They will repel (1)
12. a. Gravitational Force, Buoyant Force (1)
    b. They are equal and in opposite direction (1)
    c. 100N (1)
    
    
    Standard 8 Physics-anwerkey-2013 dec