SSC (Marathi Semi-English) 10th Standard Board Exam [इयत्ता १० वी] - Maharashtra State Board Question Bank Solutions for Science and Technology 1

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?

Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si

Taking into consideration the relationship in the first pair, complete the second pair

2H₂ + O₂ → 2H₂O :Combination Reaction :: 2HgO → 2Hg + O₂:_________

The equivalent resistance of the parallel combination of two resistors of 60Ω and 40Ω is _______.

A) 24Ω

(B) 100Ω

(C) 50 Ω

(D) 240Ω

Write the merits of the modern periodic table over Mendeleev’s Periodic table

Kavita from 10th is using spectacles. The power of the lenses in her spectacles is –2.5 dioptre. Answer the following questions:

1) Which lenses are used in her spectacles?

2) State the defect of vision Kavita is suffering from.

3) Find the focal length of the lenses used in her spectacles

Write the chemical name of bleaching powder and write its properties.

Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.

Differentiate between Normal elements and Transition elements.

Define corrosion.

What is meant by rust?

Write the chemical formula of rust.

Complete the following table:

Observe the following figure:

If the current in the coil A is changed, will some current be induced in the coil B? Explain.

Which one of the following does not increase while moving down the group of the periodic table?

Give a scientific reason.

When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

Give scientific reason.

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