SSC (English Medium) इयत्ता १० वी - Maharashtra State Board Question Bank Solutions for Science and Technology 1

Define ‘redox reaction’. Give one example.

Given below is a diagram showing a defect of human eye. Study it and answer the following questions.

(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.

Suggest measures to minimize electricity consumption at home.

In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.

Answer the following questions:

(1) What does the negative power indicate?

(2) What does the positive power indicate?

(3) Generally which type of spectacles do most of the students use?

(4) What defect of eyesight do most of the students suffer from?

(5) Give two possible reasons for the above defect.

The chemical formula for rust is.............. .

What is myopia?

Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.

Define corrosion.

What is meant by rust?

Write the chemical formula of rust.

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS

Identify from the following reaction the reactants that undergo oxidation and reduction.

\[\ce{2Ag2O → 4 Ag + O2 \uparrow}\]

Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O₂ → 2MgO

Identify from the reaction the reactants that undergo oxidation and reduction.

\[\ce{NiO + H2 -> Ni + H2O}\]

Write the name and symbol of the element from the description.

The atom having the smallest size.

Write the name and symbol of the element from the description.

The atom having the smallest atomic mass.

Write the name and symbol of the element from the description.

The noble gas with the smallest atomic radius.

Give scientific reasons for the following:

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

Write a scientific reason.

Atomic radius goes on increasing down a group.