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A column of length | is hinged at its both ends. Its equivalent length will be equal to
A) 21 B) | C) 0.51 D) 0.7071

The most abundant metal in the earth’s crust is
A) Aluminium B) Iron C) Calcium D) Sodium

Which of the following is the primary element used for making stainless steel alloy ?
A) Vanadium B) Indium C) Chromium D) Zirconium

The heat treatment process used for softening hardened steel is
A) Carburising B) Normalising C) Annealing D) Tempering

The lower critical temperature for all steel is
A) 613°C B) 723°C C) 813°C D) 923°C

Heat treatment of metals is necessary

A) To produce certain desired properties

B) To make good appearance on the component
C) To increase strength of the metal

D) To make the metal rust-proof

The process of heating steel to about 40°C above the upper critical temperature and
cooling it in still air to room temperature is known as

A) Hardening B) Annealing C) Normalizing D) Tempering
Which of the following has a fine gold colour and is used for imitation jewellery ?
A) Silicon bronze B) Aluminium bronze

C) Gun metal D) Babbit metal

Alloy of copper and zinc is known as
A) Brass B) Nickle C) Bronze D) Duralumin

The plastics are

A) Semi conductors

B) Conductors

C) Conducts at above room temperature only
D) Insulators

Which of the following carbides are used for cutting tools ?
A) Silicon carbide B) Tungsten carbide

C) Vanadium carbide D) Chromium carbide

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