SSC (English Medium) 10th Standard - Maharashtra State Board Question Bank Solutions for Science and Technology 1

Give scientific reasons for the following:

Atomic radius goes on decreasing while going from left to right in a period.

Write scientific reason.
Atomic radius goes on increasing down a group.

Study the radius of the element given below and answer the following questions.

a) Which of the above elements have the smallest atom?
b) In which group of the modern periodic table the above element are belongs?
c) What is the periodic trend observed in the variation of atomic radii down a group?

Observer the following diagram and answer the questions.
a) Which eye defect is shown in this diagram?
b) What are the possible reasons for this eye defect?
c) How this defect is corrected, write it in brief?

Rewrite the following table so as to match second and third column with first column.

Anuja cannot see the blackboard writing but she can see nearby things.
(a) What is the eye defect she is suffering from?
(b) State the possible reason for her defect.
(c) How is it corrected

On moving from left to right in a periodic table, the size of the atom _______.

The size of an atom is indicated by its _______.

_______ is the distance between the nucleus of the atom and its outermost shell.

Atomic radius is expressed in the unit _______.

While going from top to bottom in a group the atomic radius _______.

When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.

In Myopia the human eye _______.

Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.

Nearsightedness: elongated eyeball : : farsightedness: _______

Nearsightedness : concave lens : : farsightedness : _______

Write chemical formula for rust.

Nanometer unit is used to measure atomic radius.