Chapter 6: Electrical Circuits & Electric Currents - Science For Grade 7(Science ) Questions and Answers

Question 1. The pure piece of metal which is used to be plated, is made the
  1.    anode
  2.    cathode
  3.    nematode
  4.    posit rode
Explanation:-
Answer: Option A. -> anode
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. Steel cans are made of
  1.    lead
  2.    tinplate
  3.    tungsten
  4.    cobalt
Explanation:-
Answer: Option B. -> tinplate
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. Miniature circuit breaker is a small
  1.    fuse
  2.    magnetic switch
  3.    electromagnetic switch
  4.    two way switch
Explanation:-
Answer: Option C. -> electromagnetic switch
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Electricity is formed by
  1.    positively charged ions
  2.    negatively charged ions
  3.    electrons
  4.    protons
Explanation:-
Answer: Option C. -> electrons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. To make the coil keep rotating, the current is reversed after every half turn by a device called
  1.    brush
  2.    commutator
  3.    mutator
  4.    carbon spring
Explanation:-
Answer: Option B. -> commutator
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The charge flowing in the wire when we turn the light on, is
  1.    positive ions
  2.    negative ions
  3.    electrons
  4.    protons
Explanation:-
Answer: Option C. -> electrons
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Shiny objects are often made by electroplating steel with
  1.    nickel
  2.    titanium
  3.    chromium
  4.    zinc
Explanation:-
Answer: Option C. -> chromium
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The discovery which was made by Hans Oersted was used by an
  1.    British scientist
  2.    French scientist
  3.    English scientist
  4.    Chinese scientist
Explanation:-
Answer: Option C. -> English scientist
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. A good permanent magnet should produce a high magnetic field with a
  1.    high mass
  2.    low mass
  3.    dense mass
  4.    thick mass
Explanation:-
Answer: Option B. -> low mass
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. Ammeter can be connected
  1.    before the cell or battery
  2.    before the bulb
  3.    after the bulb
  4.    anywhere
Explanation:-
Answer: Option D. -> anywhere
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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