Matter and its nature- 7th Std Science 2nd Term
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Question 1 |
- Fill in the blanks.
Physical | |
Chemical |
Question 2 |
Melting of ice is a _______ change.
Physical | |
Chemical |
Question 3 |
The newly formed ________ have definite geometrical shapes and different sizes.
Stones | |
Crystals | |
Healing |
Question 4 |
A chemical change is _________
reversible | |
irreversible |
Question 5 |
The process of converting a solid directly into its vapour is known as ________
Heat Transfer | |
Evaporation | |
sublimation |
Question 6 |
Hydrated iron oxide is known as ________
Corrosion | |
rust | |
Ark |
Question 7 |
Deposition of zinc over iron is called __________
galvanization | |
Electroplating | |
Coating |
Question 8 |
Curd is ________
Bitter | |
Sour | |
Tangy |
Question 9 |
Orange juice is ________ in nature.
Alcoholic | |
Acidic | |
Citric |
Question 10 |
Soft drinks contain _______ acid.
Carbonic | |
Acetic | |
Nitric |
Question 11 |
Apple is the source of _______ acid
malic | |
Acetic | |
Citric |
Question 12 |
Sulphuric acid is _______ acid.
Organic | |
Inorganic |
Question 13 |
________ are soapy to touch.
Bases | |
Basis |
Question 14 |
________ are oxides or hydroxides of metals.
Bases | |
Basis |
Question 15 |
Bases give ____ ions when treated with water.
Positive | |
Hydroxy | |
Negative |
Question 16 |
The other name of Sodium hydroxide is ________
Caustic Soda | |
Baking Soda | |
Drinking Soda |
Question 17 |
Phenolphthalein is an ________
Indicator | |
Dicator | |
Metric |
Question 18 |
Red cabbage juice gives _________ colour wit a base.
Orange | |
Yellow | |
green |
Question 19 |
The most commonly used natural indicator is ______
litmus | |
Lakmus | |
PH Paper |
Question 20 |
Proteins contain ________ acids.
amino | |
Citric | |
Malic |
Question 21 |
_______ adds taste to our food.
Carbon Monoxide | |
Sulphuric Acid | |
Sodium Chloride |
Question 22 |
Nitric acid gives ________ salt.
Nitrate | |
Carbon | |
Sodium |
Question 23 |
Melting of ice cream is a ______ change.
Chemical | |
Physical |
Question 24 |
The process of obtaining crystals from a solution is known as _________
Condensation | |
Filtration | |
crystallization |
Question 25 |
Camphor undergoes _________
Evaporation | |
sublimation | |
Heat transfer |
Question 26 |
Ice melts into water on ______
Melting | |
Heating | |
Boiling |
Question 27 |
Water vapour when _______ condenses into its liquid state.
cooled | |
Heated | |
Melted |
Question 28 |
Absence of moisture or oxygen can prevent _______
Corrosion | |
rusting | |
Combustion |
Question 29 |
________ and __________ are necessary for rusting.
Water and Sunlight | |
Nitrogen and Sunlight | |
water and oxygen |
Question 30 |
Baking soda is _________ in taste.
Sweet | |
bitter |
Question 31 |
Organic acids are found in _____
In nature | |
Nature |
Question 32 |
Tomato contains _________ acid.
Acetic | |
Oxalic | |
Nitric |
Question 33 |
Bases which are soluble in water are called _______
Alkalis | |
Alkaline | |
Bases |
Question 34 |
The other name of Calcium oxide is _________
Lemon | |
quicklime | |
Acetic Acid |
Question 35 |
Calcium hydroxide is found in ______
Acetic Acid | |
Malic Acid | |
lime water |
Question 36 |
A safe way to find out an acid or a base is to use an _________
Integrator | |
indicator | |
Transmitter |
Question 37 |
Turmeric gives _______ colour in acids.
Green | |
Blue | |
yellow |
Question 38 |
Fats contain ______ acids.
Malic | |
Acetic | |
fatty |
Question 39 |
________ turn red litmus paper to blue.
Acids | |
bases |
Question 40 |
The new substance formed by the neutralization reaction of an acid by a base is
Papper | |
Sugar | |
salt |
Question 41 |
_____ salt is used in baking.
Sulphuric acid | |
Sodium Bicarbonate | |
Carbon Monoxide |
Question 42 |
Potassium nitrate is used in the manufacture of ______
Block Powder | |
Flash Powder | |
Gunpowder |
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There are 42 questions to complete.
