List of top Science Questions asked in Bihar Board X

The atomic number of potassium is 19. What is the valency?
What is the atomic number of fluorine?
A prism is bounded by how many surfaces?
What is the general formula of an alkane?
A solution turns red litmus into blue. The pH value of this solution would be:
What is the refractive index of diamond?
The magnification (m) in a concave lens is equal to:
The focal length of which mirror is taken as negative according to the convention of signs?
Where is the object placed to form a magnified virtual image in a concave mirror?
How many laws of refraction of light are there?
What is the value of refractive index of a medium?
What is the S.I. unit of power of lens?
Which of the following organic compounds is an alkyne?
The sodium salts of higher fatty acids are called
Which of the following is a symbol of carbonyl group?
Iodized salt is:
What is Philosopher’s wool?
How many bonds are there between two atoms of one molecule of oxygen gas?
Which solution is used to test the presence of starch?
Rate of photosynthesis is dependent on which factors?
The pores of the stomata are surrounded by which of the following?
Which gas is liberated during respiration?
What is liberated by complete oxidation of glucose?
What type of membrane is the cell membrane?
Full form of ATP is: