FORM 1 PHYSICS ONLINE TEST SERIES ELECTROSTATICS 1. Three charged balls, P, Q and R are suspended by insulating threads. Ball P is negatively charged. Ball Q is brought close to ball P. Ball Q is now brought close to ball R. A B C D 2. Which of the following statements about an electrical insulator is correct? A. it contains some electrons but more protons B. it contains some protons but more electrons C. it contains electrons but they are not free to move at all D. it contains no electrons at all 3. Two suspended light, aluminium coated with balls have been touched by the same charged perspex rod. They will; A. repel each other but be attacked by the rod B. repel each other and be repelled by the rod C. attract each other but be repelled by the rod D. attract each other and be attracted by the rod 4. A charged rod may be discharged by holding it just above a flame. This is because….. A. the rod is ionized when heated B. the hot gases in the flame are ionized C. the rod is oppositely charged to the flamed D. the hot gases strike the rod and remove its charge 5. A negatively charged strip is brought near to (but not touching) an uncharged conductor. If the conductor is earthed it A. becomes negatively charged B. becomes negatively charged on one side and positively charged on the other C. is attracted by the strip D. is repelled by the strip 6. Four processes are used to charge an isolated metal sphere. P: The sphere is earthed by touching it Q: The earth connection is removed from the sphere R: A charged rod is brought close to the sphere S: The charged rod is removed In which order should these processes be carried out to charge the sphere? A. P Q R S B. P R S Q C. R P Q S D. R S P Q 7. A plastic rod is rubbed with a cloth. At the end of the process, the rod is found to be positively charged and the cloth is found to be uncharged. This involves the movement of A. positive charge from the cloth to the rod B. positive charge from earth to the cloth. C. negative charge from the rod to earth. D. negative charge from earth to the cloth. 8. Two isolated spheres X and Y of unknown materials are touching one another as shown below. Sphere Y is negatively charged and sphere X is earthed. The earth connection is removed from sphere X and then the spheres are separated as shown below. Sphere X is found to be positively charged and sphere Y remains negatively charged. Which of the following describes the nature of the materials from which the spheres are made? Sphere X Sphere Y A. Insulator Insulator B. Insulator Conductor C. Conductor Insulator D. Conductor Conductor A B C D 9. The diagram below shows a positively charged rod brought near an isolated uncharged metal plate. As a result of bringing the rod near to the plate, A. the metal plate will gain a charge dependent on the separation of the rod and the plate. B. the metal plate will remain uncharged C. the metal plate will gain a negative charge D. the metal plate will gain a positive charge. 10. The diagram below shows a charged rod R suspended by insulating strings. When a stationary rod S is placed nearby, rod R is attracted towards it. Consider the following statements regarding the possible nature of the rod S. I. Rod S is charged II. Rod S is an uncharged insulator. III. Rod S is an uncharged conductor. Which statement(s) can explain the attraction of rod R to rod S? A. I only B. II only C. III only D. I and III only Loading … Question 1 of 10
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