SSC (English Medium) १० वीं कक्षा - Maharashtra State Board Question Bank Solutions

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.

Sodium or potassium salt of higher fatty acid is termed …………

State Fleming’s right-hand rule.

State three differences between direct current and alternating current.

Why should the wires carrying electricity not be touched barefooted?

What is myopia?

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

An object is held 20 cm away from a converging lens of focal length 10 cm. Find the position of the image formed.

Explain the term with examples.

Endothermic reaction  

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.

Electromagnetic induction means ______.

Identify the endothermic and exothermic reaction.

HCl + NaOH → NaCl + H₂O + heat

Identify the endothermic and exothermic reaction.

\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]

Identify the endothermic and exothermic reaction.

\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]

At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.

Give a scientific reason.

Simple microscope is used for watch repairs.

Solve the following example.
5 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm. Determine the position, size and type of the image.

Solve the following example.

An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?

An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?