Material Science
JKSSB Junior Engineer (Mechanical) · Material Science & Production Engineering · 32 practice questions with answers and explanations: 7 Easy, 25 Medium, 0 Hard.
Sample questions
Sample Easy question 1
Ductility is the property of a material that allows it to be:
- drawn into wires
- broken easily
- melted easily
- hammered into sheets
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Answer: A. Malleability is the ability to be hammered into thin sheets.
Sample Easy question 2
Toughness is the ability of a material to:
- conduct heat
- resist corrosion
- absorb energy up to fracture
- resist indentation
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Answer: C. It is the area under the stress–strain curve.
Sample Easy question 3
A material that can be re-softened by heating and reshaped is called a:
- ceramic
- thermoset
- composite
- thermoplastic
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Answer: D. Polythene and PVC are thermoplastics.
Sample Medium question 4
The Charpy and Izod tests are used to find the:
- fatigue limit
- hardness
- creep rate
- impact strength (toughness) of a material
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Answer: D. A notched specimen is broken by a swinging pendulum.
Sample Medium question 5
Creep is the slow, permanent deformation of a material under:
- a sudden impact
- constant stress at high temperature over a long time
- a varying stress at room temperature
- no stress
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Answer: B. Turbine blades and boiler tubes are designed against creep.
Sample Medium question 6
The fatigue failure of a component occurs under:
- repeated or fluctuating stresses well below the ultimate strength
- a single static load
- a sudden impact only
- no load
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Answer: A. Cracks start at stress concentrations and grow.