15 important questions of science.

Q1) Law of reflection of light is applicable in which types of surfaces.? 

Ans- concave, convex, plane surfaces

Q2) SI unit of optical power of lens is? 

Ans- diopter

Q3) Direction of electric current is taken opposite to the direction of flow of___? 

Ans- electron

Q4) SI unit of electric charge is____? 

Ans- coulomb

Q5) which property change with change in gravity? 

Ans- weight

Q6) which force is governed by coulombs law? 

Ans- electromagnetic force. 

Q7) The motion of the moon around the earth is governed by? 

Ans- centripetal force

Q8) Twinkling of the star is an effect of which phenomenon? 

Ans- refraction

Q9) which lens is used for correction of myopic condition? 

Ans- concave

Q10) which type of action take place to produce nuclear energy? 

Ans-  nuclear fission

Q11) Rain will be classified as acid rain if the pH of rain water  is less than___? 

Ans- 5.6

Q12) Bleaching powder has chlorine and which chemical element?

Ans- calcium (CaOCl2) 

Q13) Bonds which are formed by sharing of an electron pair between two atoms is referred as? 

Ans- covalent bond

Q14) The arrangement of elements in modern peroidic table is based on____? 

Ans- atomic number. 

Q15)  what is the chemical name of Mohr's salt?

Ans- Ammonium ferrous sulphate.