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Home › Grade8 › OLYMPIAD › Science › Force & Pressure › Force and Pressure Worksheet-7

Force and Pressure Worksheet-7

Force and Pressure Worksheet-7

 

  1. A sharp knife enable us to cut through things more easily because

(a) The pressure exerted in lesser when the same force is used

(b) The pressure exerted is greater when the same force is used

(c) The sharp edge can pass through the material slowly

(d) The sharp edge is not felt when cutting through the material

 

  1. Which of the following properties of an object cannot be changed by altering the force acting on it

(a) Mass                                         (b) Speed

(c) Direction of movement         (d) Shape

 

  1. The diagram shows an object hanging from a string. Select the correct statement about the diagram.

(a) The object does not fall because there is no gravity

(b) The object does not fall because there is friction between the object and the string

(c) The object does not fall because a magnetic force is acting on it

(d) The object does not fall because the string is exerting a force against the earth's gravity

 

  1. Which of the objects exerts the most pressure on the floor? (All objects have the same mass).

     

(a)                    (b)

(c)                          (d)

 

  1. Pressure at a certain depth (h1) in river is P1 and at another depth h2 (< h1) is P2, then

(a) P1 = P2                                      (b) P1 > P2

(c) P1 < P2                                      (d) P1 – P2 = atmospheric pressure

 

  1. A rubber sucker, when pressed on a surface sticks to it, because

(a) Gravitational pull acts on it

(b) Atmospheric pressure acts on it

(c) Rubber sucker has some glucine it

(d) None of these

 

  1. A charged body _____ an uncharged body.

(a) Attracts        (b) Repels          (c) Pushes          (d) None of these

 

  1. Match the columns and select the correct option from the codes given below.

(a) (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

(b) (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

(c) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(d) (a)-(ii), (b)-(iv), (c)-(i),(d)-(iii)

 

Answer Key:

(1)-(b); (2)-(b); (3)-(a); (4)-(d); (5)-(a); (6)-(b); (7)-(b); (8)-(a)