Read and download free pdf of CBSE Class 7 Science Changes And Reactions And Electricity Worksheet. Students and teachers of Class 7 Science can get free printable Worksheets for Class 7 Science Changes And Reactions And Electricity in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 7 students should practice questions and answers given here for Science in Class 7 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 7 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests
Worksheet for Class 7 Science Changes And Reactions And Electricity
Class 7 Science students should refer to the following printable worksheet in Pdf for Changes And Reactions And Electricity in Class 7. This test paper with questions and answers for Class 7 will be very useful for exams and help you to score good marks
Class 7 Science Worksheet for Changes And Reactions And Electricity
I. Choose the correct answer:
1) An acid reacts with a base to form a salt & water. This type of reaction is called
a) Combination reaction b) Neutralization reaction
c) Displacement reaction d) Decomposition reaction
2) Filament is made up of
a) Tungsten b) Aluminium c) Copper d) Tin
3) Resistance depends on
a) Material b) Thickness c) Length d) All of these
4) A length of wire wound closely together is called a
a) Resistance b) Coil c) Soft iron d) Fuse
5) The thin & coiled wire inside a bulb is called:
a) Terminal b) filament c) connecting wire d) supporting wire
6) Curdling of milk is a
a) Chemical change b) Physical change c) Both (a) & (b) d) None of these
7) Rusting takes place in
a) Air-free moisture b) Moisture-free air c) Moist air d) None of these
8) The digestion of food is a
a) Physical change b) Chemical change c) Both (a) & (b) d) None of these
II. Fill in the blanks.
1) An electric cell has _________ terminals.
2) A group of connected cells is called a __________
3) A thin wire has a __________ resistance than a thick wire.
4) The lower the resistance, the _________ is the current.
5) The iron used in nails is called _______ iron.
6) Melting of wax is a _______ change.
7) Cooking of food is a _______ change.
8) In a ___________ reaction, two or more reactants add up to form a product.
9) The forming of rust is called _______.
10) Hydrocarbons are compounds made of _____ and _______.
III. State true or false.
1) Electric current flows through a closed circuit.
2) A long wire has a higher resistance than a short wire.
3) The higher the resistance, the lesser is the heat produced.
4) The greater the voltage across a device, the greater is the current through it.
5) Overload & short circuit cause minimum heating.
6) When a substance is burnt only light is emitted.
7) Magnesium combines with oxygen of air to form magnesium oxide.
8) New substances are formed in a physical change.
9) The mixture of water and alcohol forms a heterogeneous mixture.
10) Petrol, diesel and LPG contain mixtures of hydrocarbons.
IV. Match the following.
A B
1) Electromagnets a) baking soda
2) Nichrome b) steel
3) sodium hydrogencarbonate c) heating element
4) metallic solids d) red-brown solid
5) rust e) washing machines
V. Define.
1) Physical change 2) Chemical change 3) Melting 4) Freezing
5) Vaporisation 6) Condensation 7) Rusting 8) Combination reaction
9) Decomposition reaction 10) Displacement reaction 11) Neutralization reaction 12) Current
13) Electric circuit 14) Circuit diagram 15) Resistance 16) Fuse
17) Coil 18) electromagnet
VI. Give reasons
1) Freshly cut apple or brinjal turns brown.
2) Burning of magnesium ribbon is considered a chemical change
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CBSE Class 7 Science Changes And Reactions And Electricity Worksheet
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Worksheet for Science CBSE Class 7 Changes And Reactions And Electricity
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Changes And Reactions And Electricity worksheet Science CBSE Class 7
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Changes And Reactions And Electricity CBSE Class 7 Science Worksheet
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Worksheet for CBSE Science Class 7 Changes And Reactions And Electricity
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