Class VIII,Science

I. Fill in the blanks          (5×1=5)

1. Phosphorus is a very _________ non-metal.

2. Copper is _________ reactive than iron.

3. Metals react with acids to produce _________ gas.

4. _________ can be beaten into thin sheets.

5. CUSO4 + Zn _________   + cu

II. State True (T) or False (F) for the statements given below     (5×1=5)

1.  Generally non-metals react with acids.                                                       (            )

2. Coal can be drawn into wires.                                                                      (             )

3. Sodium is a very reactive metal.                                                                   (             )

4. Aluminum foils are used to wrap food items.                                               (            )

5. Synthetic fibres are synthesized from raw material called petrochemicals. (             )

III. Answer the following                      (3×2=6)

1.  Explain the difference between thermoplastic and thermosetting plastics.

2. Write the properties of metals and non-metals.

3. ‘Avoid plastics as far as possible.’ Comment on this advice.

IV. Write the meanings of the following       (4×1=4)  

 1. Malleability                                      2. Conductor  

3. Polymer                                             4. Sonorous

V. Activity                   (10)

VI. Slip Test               (10)

VII. CW/HW             (10)