Question

IV. Name the following:
1. A body having no light energy of its own
2. A pair of soft iron pieces used in storing bar magnets --
3. A kind of shadow where no ray of light enters
4. A force called into play when one body is made to slide up
another body -
5. The magnitude of prefix milli
V. Choose the odd one out. Give reason for your choice.
1. newton, metre, kilogram force, gram force
2. plastic, wood, copper, steel
3. fire tongs, handle of pump, scissors, see-saw
4. sun, fire flies, diamond, red hot iron
VI. Label the parts of the pulley shown below:​

Answer 1

Question 1.)

✯ Name the following:-

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❶ A body having no light energy of its own

➠ $\underline{\underline{\bf\green{Non - Luminous}}}$

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➋ A pair of soft iron pieces used in storing bar magnets

➠ $\underline{\underline{\bf\green{Armature}}}$

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➌ A kind of shadow where no ray of light enters

➠ $\underline{\underline{\bf\green{Umbra}}}$

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➍ A force called into play when one body is made to slide up another body

➠ $\underline{\underline{\bf\green{Friction}}}$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

➎ The magnitude of prefix milli

➠ $\underline{\underline{\bf\green{10^{-3}}}}$

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Question 2.)

✯ Choose the odd one out and give the reason:-

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❶ Newton, metre, kilogram force, gram force

➠ $\underline{\underline{\bf\green{Metre}}}$

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★ Reason:-

Rest all are the unit of force whereas metre is the unit of length.

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➋ Plastic, wood, copper, steel

➠ $\underline{\underline{\bf\green{Wood}}}$

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★ Reason:-

Rest of all melt on heating at high temperatures whereas wood turns into ash.

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➌ Fire tongs, handle of pump, scissors, see-saw

➠ $\underline{\underline{\bf\green{Fire \: tongs}}}$

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

★ Reason:-

Rest of all are examples of 1st order class lever whereas fire tongs is an example of 3rd class lever.

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➍ Sun, Fire flies, diamond, red hot iron

➠ $\underline{\underline{\bf\green{Diamond}}}$

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★ Reason:-

Rest all are examples of Luminous objects except diamond.

Answer 2

Required Answer :-

IV]

1] Non Luminous Object

2] Armature

3] Umbra

4] Friction

5] $\sf 10^{-3}$

V]

1. meter

Reason - We may observe that the given option are related to force. Whereas meter is related to length

2. Wood

Reason - Wood come naturally to us.

3. Fire tongs

Reason - The concept used is of lever. Fire tongs belongs to 3rd class lever whereas  handle of pump, scissors, see-saw belong to 1st class lever.

4.Diamond

Reason - It is a non luminous object