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

Give scientific reason.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.

Fill in the blank:

The modern periodic table consists of ……………. periods.

Fill in the blank:

The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.

Corrosion can be prevented by using ……………. solution.

Calculate the focal length of a corrective lens having power +2D.

Define ‘redox reaction’. Give one example.

The device used for producing electric current is called _________.

Give the molecular formula of bleaching powder.

Differentiate between resistances in series and parallel.

Complete the following :-

(b)

Complete the following :-

(c)

Elements in the same group show the same valency. Give scientific reason.

Write the electronic configuration of K and Ne.

State Fleming’s right-hand rule.

State three differences between direct current and alternating current.

With a neat labelled diagram and derive the equation for three resistances connected in parallel.

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

Calculate the focal length of a corrective lens having power +2.5 D.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

1. Calculate the average atomic mass of elements A and C.
2. Compare the average atomic mass with atomic mass of B.
3. What could the elements A, B and C be?

An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?