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

We can see the sun even when it is little below the horizon because of ______.

Answer the following:

Explain the role of latent heat in the change of state of a substance.

Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia = 341 cal/g)

A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? (Given : latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)

Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?

Write name.
 Alloy of sodium with mercury.

Write name.

Molecular formula of the common ore of aluminium.

Write name.

The oxide that forms salt and water by reacting with both acid and base.

Write name.

The device used for grinding an ore.

Write name.

The nonmetal having electrical conductivity.

Write name. 

 The reagent that dissolves noble metals.

Write scientific reason.

Generally the ionic compounds have high melting points.

Write scientific reason.

Sodium is always kept in kerosene.

Write scientific reason.

Pine oil is used in froth flotation.

Write scientific reason.

Anodes need to be replaced from time to time during the electrolysis of alumina.

When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.

The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.

When a liquid is getting converted into solid, the latent heat is  ………………………………

Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator

Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X