Solutions-Class-6-General Science-Chapter-6-Properties of Substances-Maharashtra Board

Ice is the solid state of water.

When light rays fall on an opaque substance, light does not pass through.

Oil floats on water; this means the density of oil is less than water.

Solid: (a) Particles are very close to each other and hold each other tightly.

Gaseous: (c) Particles scatter everywhere in the available space.

(Statement (b) describes the liquid state.)

Glass : Transparent substance :: Butter paper : Translucent substance

Solid : Has a specific shape :: Liquid : Takes the shape of its container (has no shape of its own)

The mirror becomes misty/foggy and our image becomes blurred.

Reason: Our breath contains water vapour (gas). When it touches the cooler mirror, it cools and condenses into tiny water droplets (liquid). After some time the droplets evaporate and the mirror becomes clear again.

Lift both boxes. The box of stones is much heavier because stones have greater density (more mass in the same volume). The sponge box is lighter. Both boxes have the same volume but different mass.

(b) Milk, oil, sherbet. 

(Group (a) has stone- a solid, and smoke; group (c) has air- a gas, iron- a solid, and steam.)

Transparent: piece of glass, plastic sheet (clear).

Translucent: butter paper, oiled paper.

(Notebook-cardboard and sandpaper are opaque, so they are in neither list.)

The aroma of the fritters consists of tiny particles in the gaseous state. Gas particles are independent and scatter in all directions and travel long distances through the air, so they reach our nose even from far away, just like the fragrance of an incense stick.

Volume = 3 ml = 3 cm³; Mass = 7.5 g

Density = \(\frac{Mass}{Volume}=\frac{7.5}{3}\) = 2.5 g/cm³

Translucent. The glass does not let all light pass (so it is not fully transparent) but it does not block all light either (so it is not opaque). It reflects much of the outside light and lets only part of the light through.

Check with your teacher: some may also describe it as transparent from inside and opaque-looking from outside. Translucent is the best answer from the three given options.

(c) The glass becomes translucent. The dark film cuts down the light passing through, so the glass allows only a little light through.

1 kg of cotton has the greater volume. Cotton has a much lower density, so the same mass takes up much more space. (Volume = .)

Neither. Both have the same mass (1 kg), so the balance stays level. Only the volume differs, not the mass.

Measure mass: spring balance, pan (beam) balance, weighing machine, large platform balance.

Measure volume: measuring cylinder, injection syringe, measuring jug/cup.

(The clock measures time and the tape and ruler measure length, so they belong to neither group.)

Transparent instruments: measuring cylinder, injection syringe and measuring jug, because the liquid level inside must be seen from outside against the markings.