Question

Q1) DEFINE.
1) Fossil fuel
2) Conservation of energy
3) Electrolyte
4) Ionization
5) Ignition temperature
6) Calorific value of fuel
7) Frequency
8) Shill
9) Reforestation
Q2) Fill in the blanks.
Std: 8th Worksheet-02 Subject: Science________________________________
(Based on lesson nos.16,12,11,5,14,4), (P-53 to P-98)
1) Coal is a complex mixture of ___ , _____, _____ and ____ , _____, _____.
2) The process of conversion of wood to coal is called as ______.
3) The first step of coal formation is called as ___.
4) Any susbstance which is thick and sticky is said to be as _____.
5) At anode____ions gets collected.
6) To make rust free iron nail , _____ metal is used for electroplating.
7) Distilled water is _____ conductor of electricity.
8) Magnesium ribbon burns with white light and LPG burns with _____ flame.
9) Complete burning of carbonaceous fuels need ____.
10) Bifocal lens is used to correct ______.
11) Stainless steel is an alloy of ___,_______,______,______
12) Corrosion of iron is called as ______.
Q3) Draw.
1) Petroleum refinery
2) To show process of electrolysis
3) To prove that O2 is needed for combustion.
4) Show different zones of candle flame.
5) Larynx
6) To show law of reflection of light
7) To show that graphite can conduct electricity.
Q4) Name the following .
1) Full form of CNG.
2) The person who isolated sodium
3) Mixture on head of matchstick.
4) The person who invented phonograph .
5) Audible sound range of humans .

6) The first person to explain the phenomenon of dispersion.
7) Two kinds of humour present in human eye.
8) The phenomenon to show the movement in projector and cameras
9) Four allotrophs of phosphorus
10) Who discovered nitrogen gas.
Q5) Write.
1) Three categories of fossil fuel.
2) Three categories of good electrolyte
3) Three conditions necessary for combustions
4) 5 example of non combustible substances.
5) 3 types of differentiation between luminous and non luminous flame.
6) 3 examples of surfaces which can absorb sound.
7) 4 uses of ultrasonic sound waves
8) 3 examples of animals which can create ultrasonic sound.
9) 3 measures to reduce noise pollution
10) 4 charecteristics of image formed by plain mirror.
11) 3 conditions required to see and object
Q6) Explain.
1) Major steps in recycling of paper .
2) Alchohol is good or bad conductor of electricity.
3) What can we do to make pure water as bad conductor of electricity.
4) Why many home appliences have rubber insulation
5) Why sunlight is not coloured
6) Three points of diffrenciation between diamond and graphite
7) Why potassium is stored under kerosene .

Answer 1

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