STI Pre - 2012


21. 

The valency of magnesium is 2 and that of chlorine is 1. Then what is the molecular formula of magnesium chloride ?

22. 

If a bulb of 60 W is connected across a source of 220 V, then how much current is flowing through it ?

23. 

What is the modern periodic table based on ?

24. 

What is the S.I. unit of frequency?

25. 

A substance which does not take part in a chemical reaction, but by its mere presence speeds up a chemical reaction is known as

26. 

The process of rusting of iron is _________ process.

27. 

________ of the following is not a sexually transmitted disease.

28. 

One mole of a substance means how many number of molecules ?

29. 

What are radishes, carrots and beetroot ? 

30. 

Which scientist first used the term 'cell?

31. 

Which tissues are present in the hard covering of the seeds ?

32. 

What is the name of the common algae which grows in water, but does not produce flower ?

33. 

About how many kilometers of blood vessels are there in the human body?

34. 

The treatment of a disease like cancer by means of X-rays or radioactive substance is called 

35. 

A person travels a distance of 72 km in 4 hours. Then his average speed is

36. 

Which is the largest gland in the body ?

37. 

An object of mass 10 kg is brought 10 m above ground. If acceleration due to gravity at that place is 9.8 m/s2, what is the potential energy gained by the particle ?

38. 

Which vitamin is produced under the skin in the early morning sunlight ?

39. 

The electrical resistance of a 100 W, 240 V bulb will be

40. 

Deficiency of which vitamin causes ‘night blindness' in children ?

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