Electricity and Magnetic Fundamentals

231. There are how many compounds available in nature?

1. 105
2. 1000
3. 300000
4. Unlimited

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232. This paper does not exhibit electricity because it contains the same number of

1. protons and electrons
2. neutrons and electrons
3. neutrons and positrons
4. atoms

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233. Three charges of +5 C, -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?

1. 8 C
2. 14 C
3. 20 C
4. -6 C

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234. Two similar poles, each 1Wb, placed 1 m apart in air will experience a repulsive force of

1. 63OOO N
2. 63 X 10∧-3 N
3. 8 X 10∧12 N
4. 796 kN

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235. Under ordinary conditions, a body is considered

1. positively charged
2. neutral
3. negatively charged
4. stable

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236. Used to maintain strength of magnetic field

1. Container
2. Air gap
3. Keeper
4. Source

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237. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?

1. Ionic
2. Covalent
3. Metallic
4. Van der Waals

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238. What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?

1. Ionic
2. Covalent
3. Metallic
4. Van der Waals

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239. What determines the atomic number of an element?

1. The number of protons
2. The number of electrons
3. The number of neutrons
4. The number of neutrons and protons

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240. What determines the value of the temperature coefficient of resistance of a material?

1. length
2. cross-sectional area
3. volume
4. nature and temperature

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