Class 8 General Science Notes: - Unit-11- Technology in Everyday Life ( Solved Exercise MCQs)

Unit-11- Technology in Everyday Life ( Solved Exercise MCQs)

(National Book Foundation - New Book/New Syllabus Based on National Curriculum Pakistan 2023-2024 and Onwards)

(Class 8 General Science Notes for 8th Centralized Exam 2023-2024 and onward, FDE, Islamabad)

A. MCQs (Choose the Correct Answers).

1. Which of the following is NOT a component of toothpaste?

a. Glycerine
b. Baking soda
c. Lye
d. Salt

... Answer is c. Lye
Lye is a strongly alkaline solution

2. Which substance is used to make milk plastic?

a. Baking soda
b. Glycerine
c. Vinegar
d. Borax

... Answer is b. Glycerine
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3. What type of mirror is used in solar cookers?

a. Plane
b. Convex
c. Concave
d. Flat

... Answer is c.  Concave
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4. A wind turbine converts the wind kinetic energy into

a. heat.
b. electricity.
c. thermal energy
d. solar energy

... Answer is b.  electricity.
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5. In making soap, when lye is completely dissolved, the solution is left to cool to

a. 50°C.
b. 100°C.
c. 5°C.
d. 10°C.

... Answer is b.  100°C.
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