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GK Questions with answers on Science: Physics (Electricity) Set V

GK Questions with answers on Science: Physics (Electricity) 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 as well as academic examinations.
Jul 4, 2016 10:50 IST
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GK Questions with answers on Science: Physics (Electricity) 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 as well as academic examinations.

1. What is the formula for calculating resistivity of the material of a conductor?

A. Resistivity = R * A/ L

B. Resistivity = R + A/ I

C. Resistivity = R - A/ I

D. Resistivity = R * A

Answer: A

2. What is the SI unit of resistivity?

A. Meter

B. Watt

C. Ohm-metre

D. Volt

Answer: C

3. On what does the resistivity of a substance depends?

A. Length

B. Thickness

C. Temperature

D. All of the above

Answer: C

4. What is the resistivity of aluminium?

A. 2.63 * 10-8 ohm-meter

B. 1.60 * 10-8 ohm-meter

C. 44 * 10-8 ohm-meter

D. 184.0 * 10-8 ohm-meter

Answer: A

5. Which of the following metals has the lowest resistivity?

A. Nickel

B. Manganese

C. Silver

D. Mercury

Answer: C

6. Which alloy is used to make the heating elements of electric iron, electric kettle, geysers etc.?

A. Constantan

B. Manganin

C. Nichrome

D. All of the above

Answer: D

7. The heating elements of electric iron and toaster are made of:

A. Metals

B. Alloys

C. Glass

D. Hard rubber

Answer: B

8. Semi-conductors are used for making:

A. Solar cells

B. Toasters

C. Geysers

D. Room heaters

Answer: A

9. Which of the following are semi-conductors?

A. Nichrome

B. Copper

C. Silicon

D. Aluminium

Answer:  C

10. What is the SI unit of electric power?

A. Coulomb

B. Watt

C. Volt

D. Meter

Answer: B