SSC (English Medium) 10th Standard - Maharashtra State Board Question Bank Solutions

Identify the type of chemical reaction given below:

\[\ce{2Mg + O2 -> 2MgO}\]

Correlate the given sequence:

Hypermetropia : Convex lens : ______ : Concave lens

When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.

Answer the questions that follow based on this reaction.

1. Write the equation.
2. What type of reaction is it?
3. Complete the blanks:
   In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H₂O) is formed, meaning ______ of hydrogen takes place.

Answer the questions based on the equation below:

\[\ce{CH3 - CH2 - OH ->[{[O]}][K2Cr2O7/H2SO4] CH3 - COOH}\]

1. What type of reaction is it?
2. What is the role of the chemical written on the arrow?
3. Give one example of one such type of chemical as in answer (b).

It is recommended to use air tight containers for storing oil for a long time.

Observe the figure whether it is correct or not and explain the phenomenon.

Observe the figure and answer the following questions: 

1. Name the defect of vision represented in the above figure.
2. State the reasons for this defect.
3. How is it corrected?
4. Draw the diagram to show the correction of this defect.

Complete the following table by observing the given figures:

Figure →
Points ↓
(a) Name of the defect	______	______
(b) Position of the image	______	______
(c) Lens used to correct the defect	______	______

A simple microscope is used by watch repairers. Give reason.

Define Radius of curvature of the spherical mirror

Define the Focal length of a spherical mirror

What is corrosion?

Compare roasting and calcination.

A stone is thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is the same as the time taken to come down.

An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s² 

Observe the following picture a write down the chemical reaction with the explanation.

Write a scientific reason.

Metallic character goes on decreasing while going from left to right in a period.

Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.

Solve the problem.

If the mass of a planet is eight times the mass of the Earth and its radius is twice the radius of the Earth, what will be the escape velocity for that planet?

What will be the weight of a person on earth, who weighs 9N on the moon?