(a) -> (ii)
(b) -> (ii)
(c) -> (i)
(d) -> (i)
(e) -> (i)
(f) -> (ii)
(g) -> (ii)
(h) -> (ii)
Sam found a bag containing the following materials
(ii) Paper stained with oil
(iv) Glass spectacles
Which is/are these materials are opaque.
(a) (i) only
(b) (iv) only
(c) (i) and (iii)
(d) (ii) and (iv Answers
Fill in the blanks
(a) Materials that do not allow light to pass through them are called ____.
(b) Metals have a shiny appearance called _____.
(c) Materials which can be pressed easily are called _____ materials.
(d) Copper and gold are _______
(e) Dried leaves fallen on the surface of a pond _____ in the pond
(f) ______ and ________ dissolves in water Answers
State whether the statements given below are True or False.
(i) Wood is opaque, while glass is transparent .
(ii) Materials are grouped for convenience ,study their properties and their uses
(iii) Hydrogen dissolves in water.
(iv) A piece of wood floats on water.
(v) All gases dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Nitrogen dissolves in water.
(ix) Salt is soluble in water while sand is not.
(x) cooked rice is a soft material Answers
Which ones are correct
(a) A stone is hard. It therefore sinks in water.
(b) Sponge is soft. It can be compressed easily.
(c) Water in transparent. Things can be clearly seen through it.
(d) All are correct.
Which one is compressible?
Which pair of substance float in water?
(a) Pin, oil drops
(b) Coin, rubber band
(c) Plastic ball, feather
(d) Iron nail, cotton thread Answers 12-14
Question 15 Crossword Puzzle
2. cotton is a ____materials
4. The materials which are difficult to compress are known as _________
5. Iron,copper , aluminium is called _____
6. The materials through which objects can be seen, but not clearly, are known as _________
8. shiny appearance is termed as ______ Down
1. Opaque material which we got from trees
3. water is a _______ liquid
7. vinegar is ______ in water Answers
Pick one material from the following which is completely soluble in water.
(a) Chalk powder
(b) Tea leaves
(d) Saw dust
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)
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 Answers 16-18
Question 19 FILL IN THE BLANKS. [1 mark]
Materials which can be compressed are called __________.
__________ and ____________________ are examples of transparent materials.
Wood is a __________ material. (based on visibility through it)
Some materials are __________. in water whereas some others are __________.
Objects around us are made up of __________ materials.