Science Quiz, KBC Quiz, KBC Questions, Multiple Choice Question Answers

Question: Non-luminous bodies become visible when they _______ light into our eyes.

1. Radiate
   
2. Refract
   
3. Reflect
   
4. Diffract
   

Incorrect Answer

Correct Answer
Bodies like the moon and planets do not radiate their own light and they become visible only when they reflect another source of light into our eyes. These bodies are called non-luminous bodies.

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Question: Materials through which light cannot pass are said to be...?

1. Transparent
   
2. Opaque
   
3. Translucent
   
4. Obstructor
   

Incorrect Answer

Correct Answer
Opaque materials are those which do not allow the rays of light to pass through them at all. Hence, objects cannot be seen through opaque materials such as wood and metal.

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Question: Bodies that radiate light are called...?

1. Non-luminous
   
2. Opaque
   
3. Transparent
   
4. Luminous
   

Incorrect Answer

Correct Answer
Bodies like the sun, stars and fire radiate light and hence they are known as luminous bodies.

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Question: The distance between one of the magnetic poles and the centre of the bar magnet is called the...?

1. Magnetic equator
   
2. Effective length
   
3. Equator length
   
4. Length of magnet
   

Incorrect Answer

Correct Answer
The length of magnet is the distance between one of the magnetic poles (north or south) and the centre of the magnet (ON = OS = L). On the other hand, the effective length is the distance between the magnetic north pole and the magnetic south pole of a bar magnet (NS = 2L). Thus, the effective length is twice the length of magnet.

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Question: The distance between the magnetic north pole and magnetic south pole of a bar magnet is called the...?

1. Pole Length
   
2. Effective length
   
3. Equatorial axis
   
4. Length of magnet
   

Incorrect Answer

Correct Answer
The distance between the magnetic north pole and the magnetic south pole of a bar magnet is the effective length (NS = 2L), whereas the distance between one of the magnetic poles (north or south) and the centre of the magnet is called the length of magnet (ON = OS = L). Thus, the effective length is twice the length of magnet.

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Question: Most of the magnetic power appears to be concentrated at certain points of a magnet. These points are called...?

1. Poles
   
2. Inductors
   
3. Keepers
   
4. Pointers
   

Incorrect Answer

Correct Answer
Magnetic poles are the points (N for north and S for south) slightly within the ends of a magnet where most of the magnetic power appears to be concentrated.

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Question: _______ materials are those that can be influenced by a magnet.

1. Magnetic
   
2. Thermal
   
3. Optical
   
4. None
   

Incorrect Answer

Correct Answer
Magnetic substances like iron, steel, cobalt and nickel can be influenced by a magnet.

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Question: The least reactive elements of the periodic table are...?

1. Alkaline Earth Metals
   
2. Noble Gases
   
3. Alkali Metals
   
4. Transition Metals
   

Incorrect Answer

Correct Answer

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Question: The law that "the physical and chemical properties of elements are periodic functions of their atomic weights" was given by...?

1. Mendeleev
   
2. Bohr
   
3. Lothar Meyer
   
4. Moseley
   

Incorrect Answer

Correct Answer

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Question: The Law of Octaves was given by...?

1. Mendeleev
   
2. Dobereiner
   
3. John Newlands
   
4. Bohr
   

Incorrect Answer

Correct Answer

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