5) Copper and brass sheets are

Answer is:

Malleable and ductile

Explanation:

Ductility It is a property of a material enabling it to be drawn into wires.
Malleability It is a property of a material enabling it to be drawn into thin sheets.

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6) Which among the following joints is suitable for roofing work ?

Answer is:

Double grooved seam joint

Explanation:

Double grooved seam joint is suitable for roofing works.

Which among the following joints is suitable for roofing work ?

7) Which among the following tools is used for flattening the metal around punched hole ?

Answer is:

Ball pane hammer

Explanation:

Ball pane hammer is used for flattening the metal around punched hole.

Which among the following tools is used for flattening the metal around punched hole ?

8) Which one of the following types of joints is used in which the end of sheet is placed over the end of another sheet and joined together ?

Answer is:

Lap joint

Explanation:

Single riveted lap joint: This is the simplest and most commonly used type of joint. This joint is useful for joining both thick and thin plates. In this, the plates to be joined are overlapped at the ends and single row of rivets is placed in the middle of the lap.

Double riveted lap joint: This type of joint will have two rows of rivets. The overlap is large enough to accommodate two rows of rivets.