Science Exercise Unit 7 Machine

1) Which of the following is true about simple machine?
---------Simple Machine-----------Use
I-------- Pulley---------------Carry object
II--------Wedge----------- Separate one object from the other
III-------Screw------------ Join two objects together
IV------- Wheel and axle-----Changes the speed of objects
A I and IV only
B I, II and III only
C I, II and IV only
D I, II, III and IV

2) Which of the following is true?
--------Simple machine-------Example of tool
A--------Lever----------------Drill bit
B--------Wedge---------------Saw
C--------Screw---------------Broom
D--------Gear----------------Wheelbarrow

3) Which of the following situations use pulley?
I Raising a flag
II Cutting a piece of cloth
III Letting down the sail of a boat
A I and II only
B I and III only
C II and III only
D I, II and III

4) The following information shows the steps involved in designing a model
E-Testing the model
F-Constructing the model
G-Identifying the problem
H-Sketching the model
Choose the correct sequence.
A G, F, E, H
B G, H, F, E
C H, F, E, G
D H, G, F, E

5) Which of the following is not the advantage of machines?
A simply work
B speed up work
C saves time and energy
D Needs lots of human energy

6) Gopal was assigned to raise the Jalur Gemilang during an assembly.
Which simple machine did he use?
A Pulley
B Lever
C Gear
D Screw

7) Which of the following simple machines can be used as a door stopper?
A Lever
B Pulley
C Wedge
D Gear

8 ) Which of the following objects can be used as a lever to open the tight lid of a tin?
A A coin
B A raffia string
C A piece of paper
D A straw

9) What is meant by a complex machine?
A A bigger machine
B Many types of machines
C A combination of several simple machines
D A machine that helps us to do work

10) Which of the following about the uses of machines is not true?
A Machines help us to do work more easily
B We cannot do any work without machines
C Machines help to reduce the amount of effort needed to do work
D We can do work in a shorter time with machines

Answer of Unit 7
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6