SORTING MATERIALS INTO GROUPS

REVISION

1.An iron nail is kept in each of the following liquids. In which
case would it lose its shine and appear dull?
(a) Mustard oil (b) Soft drink
(c) Coconut oil (d) Kerosene
2. Pick one material from the following which is completely soluble
in water.
(a) Chalk powder (b) Tea leaves
(c) Glucose (d) Saw dust
3. You are provided with the following materials
(i) Magnifying glass (ii) Mirror
(iii) Stainless steel plate (iv) Glass tumbler
Which of the above materials will you identify as transparent?
(a) (i) and (ii) (b) (i) and (iii)
(c) (i) and (iv) (d) (iii) and (iv)
4. Boojho found a bag containing the following materials
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles

Help Boojho in finding out the material(s) which is/are opaque.
(a) (i) only (b) (iv) only
(c) (i) and (iii) (d) (ii) and (iv)
5. While doing an activity in class, the teacher asked Paheli to
handover a transluscent material. Which among the following
materials will Paheli pick and give her teacher?
(a) Glass tumbler (b) Mirror
(c) Muslin cloth (d) Aluminium foil
6. Which pair of substances among the following would float in a
tumbler half filled with water?
(a) Cotton thread, thermocol
(b) Feather, plastic ball
(c) Pin, oil drops
(d) Rubber band, coin
7. Which among the following are commonly used for making a
safety pin?
(a) Wood and glass (b) Plastic and glass
(c) Leather and plastic (d) Steel and plastic
8. Which of the following materials is not lustrous?
(a) Gold (b) Silver
(c) Wood (d) Diamond
9. Which of the following statements is not true?
(a) Materials are grouped for convenience.
(b) Materials are grouped to study their properties.
(c) Materials are grouped for fun.

(d) Materials are grouped according to their uses.

10. Find the odd one out from the following
(a) Tawa (b) Spade
(c) Pressure cooker (d) Eraser
11. Which type of the following materials is used for making the
front glass (wind screen) of a car?
(a) Transparent
(b) Translucent
(c) Opaque
(d) All the above

VERY SHORT ANSWER QUESTIONS

12. It was Paheli’s birthday. Her grandmother gave her two gifts
made of metals, one old dull silver spoon and a pair of lustrous
gold earrings. She was surprised to see the difference in the
appearance of the two metals. Can you explain the reason for
this difference?
13. Mixtures of red chilli powder in water, butter in water, petrol
in water, and honey in water were given to Radha, Sudha,
Sofia and Raveena, respectively. Whose mixture is in solution
form?
14. On a bright sunny day, Shikha was playing hide and seek
with her brother. She hid herself behind a glass door. Do you
think her brother will be able to locate her. If yes, why? If no,
why not?
15. Take a small cotton ball and place it in a tumbler/bowl filled
with water. Observe it for atleast 10 minutes. Will it float or

sink in water and why?

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 rice, pulses and fresh chapati.