MCQ Basic Physical Concepts|Physics MCQ Electrical
- The atomic number of an element is determined by:
A. The number of neutrons.
B. The number of protons.
C. The number of neutrons plus the number of protons.
D. The number of electrons. - The atomic weight of an element is approximately determined by:
A. The number of neutrons.
B. The number of protons.
C. The number of neutrons plus the number of protons.
D. The number of electrons.
MCQ Electrical Quantities|Objective Questions Electrical
- Suppose there is an atom of oxygen, containing eight protons and eight
neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting
atomic weight is about:
A. 8.
B. 10.
C. 16.
D. 18. - An ion:
A. Is electrically neutral.
B. Has positive electric charge.
C. Has negative electric charge.
D. Might have either a positive or negative charge. - An isotope:
A. Is electrically neutral.
B. Has positive electric charge.
C. Has negative electric charge.
D. Might have either a positive or negative charge. - A molecule:
A. Might consist of just a single atom of an element.
B. Must always contain two or more elements.
C. Always has two or more atoms.
D. Is always electrically charged. - In a compound:
A. There can be just a single atom of an element.
B. There must always be two or more elements.
C. The atoms are mixed in with each other but not joined.
D. There is always a shortage of electrons. - An electrical insulator can be made a conductor:
A. By heating.
B. By cooling.
C. By ionizing.
D. By oxidizing. - Of the following substances, the worst conductor is:
A. Air.
B. Copper.
C. Iron.
D. Salt water. - Of the following substances, the best conductor is:
A. Air.
B. Copper.
C. Iron.
D. Salt water. - Movement of holes in a semiconductor:
A. Is like a flow of electrons in the same direction.
B. Is possible only if the current is high enough.
C. Results in a certain amount of electric current.
D. Causes the material to stop conducting. - If a material has low resistance:
A. It is a good conductor.
B. It is a poor conductor.
C. The current flows mainly in the form of holes.
D. Current can flow only in one direction. - A coulomb:
A. Represents a current of one ampere.
B. Flows through a 100-watt light bulb.
C. Is one ampere per second.
D. Is an extremely large number of charge carriers. - A stroke of lightning:
A. Is caused by a movement of holes in an insulator.
B. Has a very low current.
C. Is a discharge of static electricity.
D. Builds up between clouds. - The volt is the standard unit of:
A. Current.
B. Charge.
C. Electromotive force.
D. Resistance. - If an EMF of one volt is placed across a resistance of two ohms, then the
current is:
A. Half an ampere.
B. One ampere.
C. Two amperes.
D. One ohm. - A backwards-working electric motor is best described as:
A. An inefficient, energy-wasting device.
B. A motor with the voltage connected the wrong way.
C. An electric generator.
D. A magnetic-field generator. - In some batteries, chemical energy can be replenished by:
A. Connecting it to a light bulb.
B. Charging it.
C. Discharging it.
D. No means known; when a battery is dead, you have to throw it away. - A changing magnetic field:
A. Produces an electric current in an insulator.
B. Magnetizes the earth.
C. Produces a fluctuating electric field.
D. Results from a steady electric current. - Light is converted into electricity:
A. In a dry cell.
B. In a wet cell.
C. In an incandescent bulb.
D. In a photovoltaic cell.
Answers
1 B 2. C 3. D 4. D 5. D 6. A 7. B 8. C 9. A 10. B 11. C 12. A 13. D 14. C 15. C 16. A 17. C 18. B 19. C 20. D
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