NCERT Class VI Science Solutions: Chapter 4 – Fibre to Fabric Part 3

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Question 14:

On a bright sunny day. Shikha was playing hide and seek with her brother. She hide herself behind a glass door. Do you think her brother will be able to locate her? If yes. Why? If no. why not?

Answer:

If glass is transparent, her brother able to see her behind the glass door.

If glass is translucent, her brother able to see her behind the glass door in form of shadow.

If glass is opaque, her brother not able to see her.

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Types of Material

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Question 15:

Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?

Answer:

Cotton ball initially floats and then sinks as it absorbs water.

SHORT ANSWER QUESTIONS

Question 16:

Which among the following materials would you identify as soft materials and why?

Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked lice, pulses and fresh chapati.

Answer:

Rubber band, leaf, eraser, cooked rice and fresh chapati are soft materials because they can be compressed or scratched easily.

Question 17:

You are provided with the following materials - turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil.

Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.

Answer:

Soluble:

  1. Honey in water.

  2. Glucose in water.

  3. Groundnut oil in mustard oil.

Insoluble:

  1. Turmeric in water.

  2. Rice flour in water.

  3. Mustard oil in water.

Question 18:

During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in Table below. Help them in filling the Table.

Filling the Table (Q)
Filling the Table (Q)

Name of the material

Appearance (Hard/Soft)

Transparency (Transparent/ Translucent/ Opaque)

Floats/Sinks in water

Soluble/Insoluble in water

Answer:

Filling the Table (A)
Filling the Table (A)

Name of the material

Appearance (Hard/Soft)

Transparency (Transparent/ Translucent/ Opaque)

Floats/Sinks in water

Soluble/Insoluble in water

Lump of salt

Hard

Opaque

Sinks

Soluble

Green grass

Soft

Opaque

Floats

Insoluble

Broken Glass Piece

Hard

Transparent

Sinks

Insoluble

A small thermocol box

Soft

Opaque

Floats

Insoluble

Pen

Hard

Opaque

Sinks

Insoluble

Iron Nails

Hard

Opaque

Sinks

Insoluble

Glass marbles

Hard

Transparent

Sinks

Insoluble

Hair

Soft

Opaque

Floats

Insoluble

Naphthalene ball

Hard

Opaque

Sinks

Insoluble

A piece of sugar candy (mishri)

Hard

Translucent

Sinks

Soluble