Class 5 General Science (G.Sc.) Notes: Unit-7: Electricity and Magnetism: Solved Exercise ( MCQs, Questions and Answers)

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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"1. Tick ( ✓ ) the Correct Answers"

i. The flow of current in an electric circuit is controlled by:

(a) a bulb
(b) a copper wire
(c) a switch
(d) rubber

... Answer is (c)  a switch
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ii. Current can easily pass through:

(a) a steel paper clip
(b) a glass strip
(c) a plastic comb
(d) a wooden spoon

... Answer is (a)  a steel paper clip
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iii. How many poles are there of a ring-shaped magnet?

(a) 1
(b) 2
(c) 3
(d) 4

... Answer is (b) 2
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v. Which one of the following is a true statement?

(a) North pole attracts the north pole
(b) North pole repels the north pole
(c) South pole repel north pole
(d) South pole attract south pole

... Answer is (b) North pole repels the north pole
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2. "Write Short Answers"

Q(i). Why does a bulb light up in a closed circuit?

Ans: When the circuit becomes complete and current starts flowing through the bulb. Then it lights up.

Q(ii).  You are given a bulb. What other components are required to light it up? 

Ans: The components are: 

Bulb, battery (cell), switch, wires to connect.

Q(iii).  Why an iron nail stuck to a magnet attracts another nail?

Ans: An iron nail stuck to a magnet attracts another nail because it becomes a temporary magnet.

Q(iv).  How can directions be found by using a magnetic compass?

Ans: The directions can be found & when the magnetic compass is rotated slowly until the north pole of the needle is aligned with the north direction of the compass.

Q(v).  A balloon is charged by rubbing it with a woolen cloth. Why does it stick to a wall?

Ans: When we rub a balloon with a woolen cloth, it gets a negative charge. When we brought it near a wall. It sticks to the wall because the wall has a positive charge. Negative and positive charges attract each other.

3. "Constructed Response Question"

Q (i). Two ring magnets are shown on a wooden stand. The upper magnet rises up and is suspended in the air as shown in the figure. 

Q(a). Why does the upper magnet float in the air?

Ans: The same pole repels each other that's why the upper magnet floats in the air.

Q(b). Label the N and S poles of magnet.

Ans:  

Q(ii). There is a bar magnet without any indication. How will you identify the South Pole? 

Ans: The unknown poles of a bar magnet can be marked by suspending it freely by a string. The geographical north-facing end of the magnet is its north pole and the geographical south-facing end is its south pole.

Q(iii). There are three similar metal bars. One is a magnet, the second is iron and the third is aluminum. How would you identify each bar?

Ans: 

1. I immediately find that one bar is attracted to neither of the other.  Mark this one as "Aluminum". 

2. Next, drop the Aluminum bar onto each of the other bars. It will drop slightly slower onto the magnet. Mark this one as a magnet. 

3. Mark's third bar is "iron". 

Investigate Question:

Q. You are provided with different materials. Investigate which material allows magnetic attraction to pass through it.

Ans-

1. Bar magnet. Attracted by magnet 

2.Paper pin. Attracted by magnet

3. Glass. Not attracted

4. Plastic. Not attracted

5. Aluminum. Not attracted

6. Steel plates. Attracted by magnet 

7.Wooden board. Not attracted

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1.  5th Class: English Notes

2.  5th Class: Social Study (S.St.) Notes

3.  5th Class: General Science (G.Sc.) Notes

4.  5th Class: Urdu (اُردو) Notes

5.  5th Class: Islamiyat (اسلامیات) Notes

6.  5th Class: Mathematics Notes

7.  Easy English Grammar Notes

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