12. Light and sound

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12. Light and sound Fill in the blanks.  1. Objects which cannot give out their own light are called Non - luminous.  2. Trandparent   object allow light to pass through them completely.  3. Reflection   is bouncing back of light from a smooth shiny surface.  Write true or false.  1. Sound does not require any medium to travel. (F)   2.The sound of loudspeaker is an unpleasant sound. (T)  3.sound travels through air in the form of particles. (F)  Let us practise 1. Fill in the blanks.  a. Noise is produced by irregular    sound waves.  b. Sun is the main source of heat and light on earth.  c. When light hits a surface and cannot pass through it, the surface is called opaque.  d. Sound is produced due to vibration of objects.  2 . Write 'T' for true and 'F' for false.  a. Honking car is an example of a pleasant sound. (F)  b. Light cannot bend around the cornera. (T)   c. Wat...
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1.Number sense (olympiad)

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 Olympiad
1.Number sense
11,20 questions

11. The smallest 4 - digit number that can be formed by using the digits 5,9,8,7 ( without repeating the digits) will have which number at its tens place? 
Ans. Smallest 4 digit no is - 5789
And at tens place there are 8
So (C) 8

12.The numeral from of eight thousand and seventy six is
Ans. (B) 8076

13.which of the foy child number has at tens place? 
Ans. (A) 

14.which of the follhas the place value of 3 as 300? 
Ans. (C) 

15. If hundred place digit and units place digit are interchanged in each of the given numbers, then which of the following number is even? 
Ans. (D) 

16.select the correct option
Ans. (B) 

17.which of the following abacuses shows the number " Four thousand three hundred and twenty one"? 
Ans. (B) 



Std three olympiad ans

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