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Andhra Pradesh Board of Secondary Education

Physical Science
Biological Science

[Click Here] 10th Class (AP State Board) Model Papers

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Write the differences between Evaporation and Boiling.

Write the differences between Evaporation and Boiling. (or) Mention the different processes that change liquids to gases and compare them. (or) Ravi asked a doubt "Is sea water evaporates or boils?" ? Give the answer to him by comparing the two processes. Answer : There are two processes that changes liquids to gases. They are Evaporation and Boiling. There are some differences between Evaporation and Boiling... Evaporation Boiling 1. The process of escape of molecules from the surface of a liquid at any temperature is called Evaporation. 1. The process of changing of liquid phase to gaseous phase at a constant temperature is called Boiling. 2. Occurs at any temperature. 2. Only occurs at certain temperature. 3. The temperature of the system gets down. 3. The temperature of the system increases upto boiling point. 4. It depends on surface area, humidity, temperature and wind speed. 4. It depends upon the nature

Why do we use Fuses in Household Circuits?

Answer: 1. To prevent damages due to overloading, we connect an electric fuse in Household circuits. 2. When a fuse is connected, the entire current in house will flow through it. 3. The fuse consists of a thin wire with low melting point. 4. When the current in fuse is overloaded, the thin wire will heat up and melt. 5. Now the circuit becomes open and current flow stops in circuit. So all electrical devices are saved from damage due to overload.

What happens to the water when wet clothes dry?

What happens to the water when wet clothes dry? (or) How does the evaporation process takes place in clothes? Answer : Wet clothes dry due to evaporation of water. The water molecules in wet clothes absorbs heat from the outer surroundings. The molecules which are on the clothes surface gets more energy and evaporation takes place. However, some molecules after going into air, return back and settle on the clothes surface. When the number of escaping molecules are more than the number of returning molecules, wet clothes dry. When there is more wind, the molecules which are escaped does not return back to the surface. So, clothes dry faster when wind is blowing.

Explain the formation of Mirage.

Explain the formation of Mirage. (or) Sometimes during the hot summer days, it appears that there is water on the road, but there would really be no water. What do you call this phenomenon? Explain why it happens. Answer: During hot summer days, it appears that there is water on the road. But when we go there, we don't find any water. This phenomenon is called as 'Mirage'. It occurs due to refraction of light. During hot days, air above the road surface is very hot and air at higher altitudes is cool. As the density of air increases with height, Refractive Index of air increases with density. The cooler air at the top has greater refractive index and the hotter air at the surface has low refractive index. If we take any two layers of air, upper layers are denser and lower layers are rarer. So light rays travel far away from Normal. When the light rays pass through particular layer where incident angle is greater than critical angle, Light rays reflect back due to Total Inte

Explain the procedure of finding Specific heat of a solid experimentally.

Explain the procedure of finding Specific heat of a solid experimentally. (or) Determine the experment to find out the Specific heat of a solid. Answer : Aim : To find out the Specific Heat of a solid experimentally. Apparatus : Calorimeter, Thermometer, Stirrer, Water, Steam Heater, Wooden box and Lead Shots. Procedure : Measure the mass of calorimeter with stirrer = m 1 gm Fill the water in Calorimeter and measure the mass = m 2 gm and mark it's temperature as T 1 . Mass of the water = (m 2 - m 1 ) gm . Take few lead shots in steam heater and heat up to 100℃. Let this temperature be T 2 . Pour lead shots into calorimeter and measure the final temperature T 3 . Mass of Calorimeter with Water and Leadshots is m 3 gm . Mass of lead shots = (m 3 - m 2 ) gm . Consider the Specific Heats of Calorimeter, Lead shots and water be S c , S l and S w respectively. We know that Heat lost by hot body = Heat gained by cold bodies. (m 3 - m 1 )S l (T 2 - T 3 ) = m 1 S c (T 3 - T 1

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