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Wednesday, 5 February 2020

Important 2 Marks Questions - 10th Class Physical Sciences - by Sri Ganesh Sir

10th Class Physical Sciences - Important 2 Marks Questions with Answers పశ్చిమ గోదావరి జిల్లా ఏలూరు కు చెందిన భౌతిక, రసాయన శాస్త్రముల ఉ... thumbnail 1 summary

10th Class Physical Sciences - Important 2 Marks Questions with Answers

Important Questions with answers
పశ్చిమ గోదావరి జిల్లా ఏలూరు కు చెందిన భౌతిక, రసాయన శాస్త్రముల ఉపాధ్యాయులు శ్రీ గణేష్ గారు పదవ తరగతి చదువుతున్న విద్యార్ధినీ విద్యార్ధులకోసం కనీసం పాస్ కావడానికి సహకరించే, 2 మార్కుల విభాగానికి, 1 మార్కు విభాగానికి ఉపయుక్తమైన చక్కని ప్రశ్నలు - సమాధానాలను రూపొందించి అందించడం జరిగింది. జస్ట్ రెండు పేజీలలో ప్రింట్ తీసుకోవడానికి వీలుగల ఈ ప్రశ్నలు - సమాధానాలు
పిడిఎఫ్ ను డౌన్ లోడ్ చేసుకోవడానికి ఇక్కడ క్లిక్ చేయండి.


1) Why dog’s pant during hot summer days using the concept of evaporation?
1. Dog didn’t have sweat glands on its skin except on Its foot pads.
2. On a hot day to control its temperature it pants, and water evaporates.
3. Evaporation is a cooling process.
4. so dog pant during hot summer days.
2) Why do we get dew on the surface of a cold soft drink bottle kept in open air?
1. The vapour in the surroundings of cold soft drink bottle condensed into water.
2. so we get the dew on the surface of a cold soft drink bottle.
3) Write differences between evaporation and boiling.
Evaporation
Boiling
1. The conversion of gas into liquid below its boiling point called evaporation
1. The conversion of gas into liquid at constant temperature called boiling
2. No bubbles formed during evaporation
2. Bubbles formed during evaporation

4) Convert 200C into Kelvin scale?
            200C + 273 = 293 K
5) Ask questions to differentiate between evaporation and boiling?
1. What is boiling?
2. What is evaporation?
6) What happens to the water when wet clothes dry?
1. water evaporates into surroundings whom wet clothes dry.
7) Equal amount of water is kept in a cap and in a dish,  which evaporates faster why?
1. water in a dish evaporates faster
2. Because its surface area is more than a cap
8) What role does specific heat play in keeping watermelon cool for a long time after removing it from a fridge on a hot day?
1. Watermelon contains more percentage of water.
2. Specific heat of water is high; it takes more time to loose it’s coolness.
9) What is a neutralization reaction? Give two examples.
1. When acid react with base, it gives salt and water called neutralization reaction.
Example: NaOH + HCl à NaCl + H2O
            KOH + HCl à KCl + H2O
10) What happens when an acid (or) base mixed with water?
1. when acid (or) base mixed with water it splashes out
2. when water is mixed with acid (or) base it will be diluted.
11) Why does tooth decay starts when pH of mouth is lower than 5.5?
1. Tooth enamel made up of calcium phosphate.
2. When pH of mouth lower than 5.5 it will be corded then tooth decay starts.
12) Why doesn’t distilled water conduct electricity?
Distilled water doesn’t have ions, so they don’t conduct electricity.
13) Why pure acetic acid doesn’t conduct electricity
Pure Acetic acid doesn’t have ions. so, it doesn’t conduct electricity.
14) Plaster of Paris should be stored in moisture proof container. Explain why?
When water is added plaster of Paris turns into hard solid mass called Gypsum. So, it should be stored in moisture proof container.
15) How does the flow of acid rain into a river make the survival of aquatic life in a river difficult?
1. If the pH of rainwater less than 5.6 it is called acid rain.
2. Living organisms can survive only in a narrow range of pH change
3. When acid rain flows into river aquatic animals’ survival will be difficult
16) What is baking power? How does it make the cake soft and spongy?
1. Baking power is a mixture of baking soda and tartaric acid.
2. When baking power heated (or) mixed with water it produces CO2
3. CO2 will make cake soft and spongy.
17) Give two important uses of washing soda and baking soda?
Uses of Baking soda:
1. Used to make baking power
2. Used in making antacid tablets.
Uses of Washing Soda:
1. Used as cleaning agent in domestic purposes
2. Used in soap, glass and paper industries.
18) what is electronic configuration?
The arrangement of electrons in shells, subshells, orbitals called electronic configuration.
19) What is nlx method? How it is useful?
1. nlx method is used to write electronic configuration
2. n – principle quantum number; l – azimuthal quantum number, x – number of electrons.
20) What is an emission spectrum?
when an atom of an element excited it emits a colour of specific wavelength called emission spectrum.
21) What is an absorption spectrum?
When an atom of an element excited in presence of white light it absorbs a light of specific wavelength called absorption spectrum.
22) Give example for Dobereiner triodes?
1. Li, Na, K    2. Cl, Br, I
23) What is Mendeleeff’s periodic law?
The physical and chemical properties of the elements are periodic functions of their atomic weights.
24) What is modern periodic law?
The physical and chemical properties of the elements are periodic functions of their electronic configurations.
25) What is Atomic Radius?
The distance from the nucleus of atom to the Outermost shell called atomic radius.
26) What is ionization energy?
The energy required to remove an electron from the outermost orbit or shell of a neutral gaseous atom is called ionization energy.
27) What is octet rule?
Every element tries to get eight electrons in it’s outermost shell called octet rule.
28) What is Difference between valence electrons and Covalency?
Valence electrons: The number of electrons in the outermost shell of an atom.
Covalency: The number of covalent bonds formed by an atom.
29) Silver is a better conductor of electricity for conduction of electricity.
Silver is costlier than copper. So, we prefer copper to Silver.
30) Why do we use fuses in household circuits?
1. When the current drawn from main exceeds the max limit 20 A called over loading.
2. When fuse is added household circuit it will melt when current exceeds 20 A to save the devices in our houses.
31) What is Lenz’s law?
The induced current set up in the coil in such a direction that it opposes the changes in the flux.
32) What happens if we connect electrical appliances in the household circuits in Series?
1. Electrical appliances in the household circuits are connected in parallel.
2. If they connected in Series, when one of the resistors in series break down, the circuit becomes open and current don’t flow in the circuit
33) Why do we consider tungsten as suitable material for making the filament of a bulb?
1. Tungsten has high resistivity and high melting point.
2. So it is used in the making of filament of a bulb
34) Are the head lights of a car connected in series or parallel why?
1. The head lights of car are connected in parallel.
2. If they connected in Series one of them failed to work another one also stop to work.
35) Why is it difficult to shoot a fish swimming in water?
1. Due to refraction the fish appears to be raise in the water.
2. So we can’t judge the actual position of fish to shoot it.
36) Refractive index of glass relative to water is 9/8. What is the refractive index of water relative to glass?
Answer is 8/9
37) What is the reason behind the shining of diamonds and how do you appreciate it?
1. Total internal refraction is the main reason for shining of diamonds
2. The critical angle of diamond is very low (24.4) so if a light ray enters into diamond, it is very likely to undergo total internal reflection.
3. So I appreciate the scientific reason behind brilliance of diamonds.
38) Why do starts appear twinkling?
1. The light from the stars undergo multiple refractions through the layers of atmosphere.
2. So starts appear twinkling.
39) A man wants to get a picture of zebra. He photographed a white donkey after fitting a glass with black stripes on the lens of his camera. What photo will he get explain?
He will get a photo of donkey with less brightness.
40) Write lens maker’s formula? explain.
here f – focal length of lens
n – refractive index of the material of lens
R1, R2 – radii of curvatures.
41) Explain the reason for blue colour of sky?
1. Scattering is the phenomenon involved in blue colour of sky.
2. Oxygen, Nitrogen in our atmosphere scatters blue colour more than other colours so sky appears blue in colour.
42) How do you appreciate the working of ciliary muscles in the eye?
1. Ciliary muscles help us to get image exactly on retina wherever the object is.
2. It adjusts our eye lens depending on objects distance called accommodation.
3. So I appreciate ciliary muscles.
43) Why does the picture distorted when a bar magnet is brought close to the screen of a television?
1. The magnetic field affects the motion of electrons.
2. So the picture distorted when a bar magnet is brought close to the screen of a television.
44) Give few applications of Faraday’s law of induction in daily life?
1. in security checkups
2. in tape recorders
3. For working of ATM cards.
4. For working of Induction Stove.
Faraday’s law of induction will be used in daily life.
45) List three metals that are found in nature in free state (or) uncombined form?
Gold, Silver, Copper
46) Write the names of any two ores of Iron?
Haematite, Magnatite
47) What is the difference between Roasting and Calcination?
Roasting is a process of heating ore in presence of oxygen.
Calcination is a process of heating ore in absence of air.
48) Magnesium is an active metal. If it occurs as chloride in nature, which method of reduction is suitable for its extraction?
Electrolysis
49) What is activity Series? How it helps in extraction of metals?
1. Arranging metals in the descending order of their reactivity called activity series.
K, Na, Ca, Mg, Al, Zn, Fe, Pb, Cu
2. By this series we can choose the process of material’s extraction.
50) What is thermite process? Mention its applications in daily life?
1. Highly reactive metals displace metals of lower reactivity from their compound called thermite process.
2. This method is used to join railing of railway tracks or cracked machine parts.
51) Name the simplest Hydrocarbon?
Methane (CH4)
52) What are the general molecular formulae of alkanes, alkenes, Alkynes?
Alkanes: CnH2n+2
Alkenes: CnH2n
Alkynes: CnH2n-2
53) Name the product other than water formed on burning of ethanol in air?
Carbon Dioxide (CO2)
54) What do we call self-linking property of carbon?
If an element forms bonds between its own atoms to give big molecules called catenation.
55) Name the compound formed by heating ethanol at 443K with excess of Con. H2SO4?
Ethylene (C2H4)
56) Give the names of functional groups 1. – CHO     2.  C=O
1. – CHO : Aldehyde
2.   C=O : Ketone
57) Name the acid present in Vinegar?
Acetic acid or Ethanoic acid
58) What happens when small piece of sodium is dropped into ethanol?
it liberates Hydrogen gas.
59) Define the terms 1. Gangue  2. Slag.
1. Gangue: the unwanted impurities like sand and clay in the ore called gangue.
2. Slag: when flux is reacted with Gangue it given slag.
60) What is the lens formula


Prepared by
Sri N Ganesh Sir
School Assistant in Physical Sciences
Eluru, West Godavari District.

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