CTET Paper II (Upper Primary: Class 6-8)

Materials - Fibres Plastics Metals Non-Metals Acids Bases Salts question bank (Mathematics & Science)

Practice 121 free CTET Paper II (Upper Primary: Class 6-8) Mathematics & Science - Materials - Fibres Plastics Metals Non-Metals Acids Bases Salts questions with answers and step-by-step solutions.

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Q1.

A teacher provides students with samples of cotton, wool, silk, and synthetic nylon fibers. She asks them to perform a burn test and observe the odor, residue, and flame behavior. What pedagogical approach is being demonstrated here?

Topic: Materials - Fibres Plastics Metals Non-Metals Acids Bases Salts | Source: AI Generated (CTET Paper II (Upper Primary: Class 6-8))

(A)
Behaviorist drill and practice
(B)
Inquiry-based empirical investigation
(C)
Passive lecture demonstration
(D)
Teacher-centered rote learning
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Q2.

Why do school science textbooks emphasize that thermoplastic polymers can be repeatedly melted and reshaped, whereas thermosetting plastics cannot?

Topic: Materials - Fibres Plastics Metals Non-Metals Acids Bases Salts | Source: AI Generated (CTET Paper II (Upper Primary: Class 6-8))

(A)
Thermosetting plastics have linear polymer chains held together by weak hydrogen bonds.
(B)
Thermoplastics have cross-linked polymer chains that break permanently upon heating.
(C)
Thermoplastics possess linear or slightly branched chains with weak intermolecular forces that soften on heating, while thermosetting plastics undergo extensive cross-linking forming a rigid, infusible network.
(D)
Thermosetting plastics are made from natural fibers, while thermoplastics are metallic alloys.
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