ICSE Class 6 Physics - Simple Machines - Test 4 (Expert)
1. A student uses a rod to lift a heavy rock. To use less effort, the fulcrum should be moved:
A. Far away from the rock
B. Closer to the rock
C. To the effort end only
2. A door is easier to open when pushed near the handle rather than near the hinges because the handle gives:
A. Less turning effect
B. No force at all
C. Greater turning effect
3. A pair of pliers works mainly as:
A. Two levers working together
B. Only a pulley
C. Only an inclined plane
4. In pliers, the joint between the handles and jaws acts as the:
A. Load
B. Fulcrum
C. Screw thread
5. Tweezers are commonly an example of a:
A. Second-class lever
B. Fixed pulley
C. Third-class lever
6. A worker finds it harder to push a box up a short steep ramp than a long gentle ramp because the short ramp needs:
A. More effort
B. No effort
C. Less load always
7. When a ramp is used to load a box into a truck, the effort decreases but the distance moved:
A. Becomes zero
B. Increases
C. Changes into mass
8. A fixed pulley is used at the top of a pole. If the free end of the rope is pulled downward, the load moves:
A. Downward
B. Sideways only
C. Upward
9. A movable pulley helps lift a heavy load with less effort because the load is supported by:
A. More rope sections
B. No rope at all
C. Only the ground
10. An elevator uses pulleys and other mechanisms. It is best described as a:
A. Single wedge only
B. Complex machine
C. Simple thermometer
11. A sharp chisel cuts wood better than a blunt chisel because its edge is:
A. Wider and flat
B. Made of rope
C. Narrow and sharp
12. When a nail is hammered into wood, its pointed tip helps it enter because the tip acts as a:
A. Wedge
B. Pulley
C. Measuring cylinder
13. A screw with many close threads is useful because it can:
A. Work without turning
B. Hold objects tightly
C. Change into a pulley
14. When a jar lid is twisted shut, it tightens because it works like a:
A. Fixed pulley
B. First-class lever only
C. Screw
15. A cart with wheels is easier to move than a box dragged on the ground because wheels:
A. Reduce friction
B. Increase the load always
C. Remove the need for roads
16. A wheelbarrow is useful because it combines:
A. Only two screws
B. A lever and a wheel and axle
C. Only a wedge and thermometer
17. A real machine cannot be 100% efficient because:
A. It creates energy from nothing
B. It has no moving parts
C. Some energy is lost due to friction
18. Oil is added to the moving parts of a machine mainly to:
A. Reduce friction
B. Increase unnecessary heat
C. Make the machine stop forever
19. Which statement about simple machines is correct?
A. They remove all work completely
B. They help us do work more easily
C. They always make effort greater than load
20. Which situation best shows the advantage of a simple machine?
A. A person lifts a load with bare hands only
B. A load becomes weightless without reason
C. A ramp helps push a heavy box into a van