Q1. Washing Soda in water behaves like _____.

Q2. Silica is used in _____.

Q3. Detergents dissolved in water help in cleaning clothes by

Q4. What is used in making of alloys?

Q5. Radar transmits short pulses of high frequency called

Q6. Yeast used in making of bread is a:

Q7. Which one of the following can be used to focus sunlight?

Q8. Which one of the following colours has the longest wavelength?

Q9. The ray with high penetrating power is _____.

Q10. The heart of a normal adult human being weighs about _____.

Q11. What is the chemical name of bleaching powder?

Q12. A satellite moving round the earth with a uniform speed has _____?

Q13. Friction can be reduced by changing over from _____.

Q14. A light year is the unit of _____.

Q15. A mobile phone sends and receives messages through _____.

Q16. The acid used in a car battery is _______.

Q17. An instrument to detect the purity of milk is _______?

Q18.  In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as:

Q19. The range of a 100 meter high T.V. transmitter antenna is about:

Q20. Ice blocks are covered with sawdust

Q21. In railway tracks, a small gap is left between the rails _____.

Q22. Bio gas is the common name of ______.

Q23. Amino acids are a product of the digestion of _________.

Q24. The waves used for sending signals to the satellite from ground station are _______.

Q25. Video camera is used to convert ________.