Class 5 General Science (G.Sc.) Notes: - Solved Activities of Unit-7: Electricity and Magnetism

General Science (G.Sc.) Class 5 Notes

Based on the Single National Curriculum, PK

(New Book/New Syllabus for 2023-2024 Exams and onward)

National Book Foundation
as
Federal Textbook Boards, Islamabad

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Activity 7.3 (Page no. 94) 

Properties of Charges

Q.1. Do the balloons attract or repel each other in normal conditions? 

Ans: The balloons do not show any change in normal conditions. 

Q.2. What happens when both balloons are rubbed with woolen cloth? 

Ans: Both the balloons repel each other. 

Q.3. Why does this happen? 

Ans: When the balloons are rubbed with woolen cloth both of them acquire a negative charge due to which they repelled each other. 

Q.4. What happens when one balloon is rubbed with a woolen cloth and the other with plastic objects? 

Ans: The balloons acquired opposite charges. Hence they attracted each other. 

Q.4. What inference do you draw from your observations? 

Ans: Similar charges repel each other and opposite charges attract each other. 

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Activity 7.7 Page 100 

Magnetic and Non-Magnetic Materials 

1: Write down the names of the given objects attracted by the magnet.

Ans:

i. Iron Nails 

ii. Steel Clips 

iii. Steel Pins 

2: Which of the given materials is not attracted by the magnet? 

Ans:

i. Copper Wire 

ii. Pencil 

iii. Rubber Eraser 

iv. Stone 

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Activity 7.9 Page 102 

Properties of Magnet

1. What happens when the North Pole of the second magnet comes close to the North Pole of the suspended magnet? 

Ans: Both magnets strongly repel each other. 

2. What happens when the South Pole of the second magnet comes close to the South Pole of the suspended magnet? 

Ans: Both the poles are the same. Hence, they will repel each other. 

3. What happens when opposite poles come near? 

Ans: When opposite poles come near, they attract each other. 

4: What do you conclude from this activity? 

Ans: Two like magnetic poles repel each other, while opposite poles attract each other.

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