Chapter 4 – Sorting materal into groups
ACTIVITIES:
QUESTION-ANSWERS
Question 1-
What is matter?
Answer- Anything that has mass and occupies space is
known as matter.
Question 2- The
density of an object is slightly less than that of water, will it sink or float in water?
Answer- Float.
Question 3- Is
clear water opaque, transparent or translucent?
Answer- Transparent.
EXERCISE
Question 1- Fill In
The Blanks.
a). Name five objects which can be made from wood.
Table,
chair, door, desk and pencil.
b). Sugar is soluble
in water.
Question 2- Write
True Or False.
a). Stone is transparent. (False)
b). A piece of wood floats on water. (True)
c). A windowpane is opaque. (False)
d). Oil mixes with water. (False)
e). Vinegar dissolves in water (True)
Question 3- Match
The Column ‘A’ With Column ‘B’.
A B
1. Book
a. Glass (2)
2. Tumbler
b. Wood (3)
3. Chair c. Paper (1)
4. Toys
d. Leather (5)
5. Shoes e. Plastic (4)
Question 4. Choose
The Correct Answer.
(i). Which of
the following is not matter?
a) water
b) sound (✓)
c) air
d) fruits
(ii). Which
property is common to all matter?
a) Matter takes up space and has no mass
b) Matter takes up space and some mass
c) Matter takes up space and has mass (✓)
d) Matter takes up space and may or may not have mass
(iii). Which of the following is
transparent?
a) wood
b) glass (✓)
c) paper
d) plastic
Question 5- Very
Short Answer Type Questions.
(i) What is an
atom ?
Answer- Atom is the smallest piece of matter, which
may or may not exist independently.
(ii) Define
density.
Answer- The mass per unit volume of substance is known
as density.
(iii) What are
transparent objects?
Answer- If most of the light can pass through an
object, it is known as transparent object.
(iv) What are
opaque objects?
Answer- If no light can pass through an object, it is
known as opaque object.
(v) What are
translucent objects?
Answer- If light can pass through an object partially,
it is known as translucent object.
Question 6- Short
Answer Type Questions.
(i) What is the
difference between transparent and translucent objects? Give examples.
Answer-
|
Transparent
Objects |
Translucent
Objects |
|
1.
If most of the light can pass through an object, it is known as transparent
object. |
1.
If light can pass through an object partially, it is known as translucent
object. |
|
2.
Examples – Glass and clear water. |
3.
Examples – Frosted glass and wax paper. |
(ii) Select the objects from the
following which shine. Glass bowl, plastic mug, steel chair, cotton shirt, gold chain and silver
ring.
Answer- Glass bowl, steel chair, gold chain and silver
ring.
Question 7- Long
Answer Type Questions.
(i) Are all
liquids soluble in water?
Answer- No, all liquids are not soluble in water. Oil
like substances are not soluble in water, they make layer on water.
(ii) List any
four items that can float on water and five items that cannot float on water.
Answer- Items
that can float on water- Wood, dry leaf, plastic, dry paper, rubber and
empty earthen pot.
Items
that cannot float on water- Iron nail, stone,
aluminium sheet, copper wire, a piece of glass and filled pot.
