Simple Machines Quiz - CBSE Class 4 Science

Free practice quiz: Simple Machines (CBSE Class 4 Science). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is a simple machine?

   1. A complex tool
   2. A device that makes work easier
   3. A type of engine
   4. A scientific experiment
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   Answer: B. A device that makes work easier

   A simple machine is defined as a device that makes work easier by allowing us to apply a smaller force over a greater distance.

2. How does a screw make work easier?

   1. By increasing speed
   2. By changing direction
   3. By applying force over a distance
   4. By reducing friction
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   Answer: C. By applying force over a distance

   A screw makes work easier by allowing a small circular force to be applied to move things up or down along its spiral.

3. What type of simple machine is commonly used in cranes?

   1. Lever
   2. Pulley
   3. Screw
   4. Wedge
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   Answer: B. Pulley

   Cranes often use pulleys as part of their systems to lift heavy loads with less effort, allowing for easy movement of materials.

4. Which simple machine can be used to hold things together?

   1. Screw
   2. Lever
   3. Pulley
   4. Wedge
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   Answer: A. Screw

   A screw can hold materials together by providing a strong grip as it is driven into a surface, thanks to its helical structure.

5. What is a compound machine?

   1. A machine made of two or more simple machines
   2. A complex tool
   3. A type of computer
   4. A machine that does not work
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   Answer: A. A machine made of two or more simple machines

   A compound machine consists of two or more simple machines working together to accomplish a task more efficiently.

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