Magnetic field of earth always has a horizontal component except at:

1. Equator
2. Magnetic Pole
3. At 60 degrees latitude
4. None of these
5. All of these

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Which one of the following does not depend on the magnetic effect of current for its working:

1. Carbon microphone
2. Telephone receiver
3. Electric Fan
4. None of these
5. All of these

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Which pure substance will not conduct electricity?

1. Molten NaCI
2. Molten KOH
3. Liquified HCl
4. None of these
5. All of these

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Energy is carried by:

1. Longitudinal progressive wave
2. Transverse progressive wave
3. Stationary wave
4. None of these
5. All of these

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A wave in which the particles of the medium vibrates back and forth in the same direction in which the wave is moving is called:

1. Longitudinal Wave
2. Electromagnetic Wave
3. Transverse Wave
4. None of these
5. All of these

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The detect of eye Hypermetropia is corrected by using:

1. Concave lens
2. Convex lens
3. Concave lens
4. Spherical lens
5. None of these

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Light emitting diodes are made from specific compounds of:

1. Hydrogen
2. Copper
3. Gallium
4. None of these
5. All of these

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Speed of sound is maximum through

1. Air
2. Glass
3. Water
4. All of these
5. None of these

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Ball bearings are used to reduce friction by:

1. Applying lubricant in the balls used
2. Reducing the area of the contact with the use of metallic balls
3. Increasing the area of contact with the use of metallic balls
4. None of these
5. All of these

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Copper wires are generally used for electrical power transmission instead of iron wires because:

1. Copper is cheaper than Iron
2. Copper is a better conductor than iron
3. Copper is lighter than iron
4. None of these

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