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GK Questions with answers on Science Physics (Magnetic field of electric Current) Set V

GK Questions with answers on Science Physics (Magnetic field of electric Current) Set V ,in this set you will find repository of 10 Objective Type Questions that will help you to attune and equipped for different competitive examinations like UPSC-prelims, IAS-prelims, NDA, CDS, SSC, State Services etc as well as academic examinations.
Jul 28, 2016 10:12 IST
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GK Questions with answers on Science Physics (Magnetic field of electric Current) Set V ,in this set you will find repository of 10 Objective Type Questions that will help you to attune and equipped for different competitive examinations like UPSC-prelims, IAS-prelims, NDA, CDS, SSC, State Services etc as well as academic examinations.

1. If the current reverses direction after equal intervals of time, it is called:

A. Direct current

B. Alternating current

C. Induced current

D. Ionic current

Ans: B

2. At what time interval does the alternating current produced in India reverse its direction?

A. 1/100 second

B. 5 seconds

C. 1 minute

D. 5 minutes

Ans: A

3. Which of the following are the sources for producing alternating current?

A. Power house generators

B. Bicycle dynamos

C. Car alternators

D. All of the above

Ans: D

4. Which of the following convert’s mechanical energy into electrical energy?

A. Refrigerator

B. Fan

C. Electric motor

D. Electric generator

Ans: D

5. What is the frequency of alternating current produced in India?

A. 15 Hz

B. 50 Hz

C. 55 Hz

D. 65 Hz

Ans: B

6. In generators, the voltage produced can be increased by:

A. Coil with more turns

B. Rotating coil faster

C. Using coil with larger area

D. All of the above

Ans: D

7. Which of the following parts of the generators is stationary to produce electricity in large powerhouses?

A. Coil

B. Electromagnet

C. Slip rings

D. Carbon brush

Ans: A

8. Which of the following parts is not there in A.C. generator?

A. Slip rings

B. Coil

C. Commutator

D. Galvanometer

Ans: C

9. Where do we use transformers?

A. Power stations

B. Radio sets

C. Television

D. All of the above

Ans: D

10. How much electric potential does the live wire carry?

A. 100 volts

B. 150 volts

C. 185 volts

D. 20 volts

Ans: D