CBSE Class 8 Science Exploring Forces (Class 8 NCERT New) Quiz 4

1. If two magnets are placed close together with their north poles facing each other, what will happen?

A They will attract each other B They will repel each other C Nothing will happen D They will lose their magnetism

2. Which of the following is evidence that a magnetic field exists between two objects that are not in contact?

A The objects change color B The objects move toward or away from each other C The objects make a sound D The objects heat up

3. Which statement best describes how you can detect the presence of a magnetic field?

A By measuring the temperature near a magnet B By observing the movement of iron filings near a magnet C By listening for sounds near a magnet D By tasting the air near a magnet

4. You are given two magnets and asked to design an experiment to test how the strength of the magnetic force changes with distance. Which procedure would best help you investigate this?

A Place the magnets at different distances and measure the force needed to separate them B Change the color of the magnets and observe any changes C Heat the magnets and measure their temperature D Weigh the magnets and record their mass

5. A student observes that a paperclip moves toward a magnet even though they are not touching. What does this observation suggest?

A The magnet is broken B A magnetic field exists between the magnet and the paperclip C The paperclip is electrically charged D The paperclip is made of plastic

6. A student places a compass near a magnet and observes the needle move. What does this experiment demonstrate?

A The magnet is losing strength B The compass is broken C The presence of a magnetic field around the magnet D The magnet is electrically charged

7. A student designs an experiment to test the effect of different materials on the strength of magnetic forces. What should the student do to ensure a fair test?

A Change both the material and the distance between objects B Keep the distance the same and only change the material C Change the color of the objects D Use objects of different sizes

8. A student conducts an experiment to test if magnetic fields exist between objects not in contact. They place a magnet under a piece of paper and sprinkle iron filings on top. The filings form patterns. How should the student use this evidence to support their conclusion?

A Ignore the patterns and focus on the color of the filings B Use the patterns to show that magnetic fields exist even when objects are not touching C Only test with different colored filings D Repeat the experiment with no magnet

9. The strongest part of a magnet is...

A the bars. B the force field. C the poles. D the middle.

10. A compass needle responds to a magnetic field, because the compass needle is a

A A. generator. B B. motor. C C. magnet. D D. transformer.