MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
Gamma iron exits at following temperature |
| A. | room temperature |
| B. | near melting point |
| C. | between 1400°C and 1539°C |
| D. | between 910°C and 1400°C |
| Answer» E. | |
| 602. |
Pure iron is the structure of |
| A. | ferrite |
| B. | pearlite |
| C. | anstenite |
| D. | ferrite and cementite |
| Answer» B. pearlite | |
| 603. |
The following types of materials are usually the most ductile |
| A. | face-centred cubic lattice |
| B. | body-centred cubic lattice |
| C. | hexagonal close-packed lattice |
| D. | all of the above |
| Answer» B. body-centred cubic lattice | |
| 604. |
Which of the following represents the allotropic forms of iron |
| A. | alpha iron, beta iron and gamma iron |
| B. | alpha iron and beta iron |
| C. | body centred cubic a-iron and face centred cubic a-iron |
| D. | alpha iron, gamma from and delta iron |
| Answer» E. | |
| 605. |
Which of the following constituents of steels is softest and least strong |
| A. | austenite |
| B. | pearlite |
| C. | ferrite |
| D. | cementlte |
| Answer» D. cementlte | |
| 606. |
Delta iron occurs at temperature of |
| A. | room temperature |
| B. | above melting point |
| C. | between 1400°C and 1539°C |
| D. | between 910°C and 1400°C |
| Answer» D. between 910°C and 1400°C | |
| 607. |
Points of arrest for iron correspond to |
| A. | stages at which allotropic forms change |
| B. | stages at which further heating does not increase temperature for some time |
| C. | stages at which properties do not change with increase in temperature |
| D. | there is nothing like points of arrest |
| Answer» B. stages at which further heating does not increase temperature for some time | |
| 608. |
The elastic stress strain behaviour of rubber is |
| A. | linear |
| B. | non-linear |
| C. | plastic |
| D. | no fixed relationship |
| Answer» C. plastic | |
| 609. |
Stress relaxation is- the phenomenon |
| A. | in which parts are not loaded |
| B. | in which stress remains constant on in-creasing load |
| C. | in which deformation tends to loosen the joint and produces a stress reduced |
| D. | stress reduces on increasing load |
| Answer» D. stress reduces on increasing load | |
| 610. |
The number of electrons in 1 cm3 of metal would be of the order of |
| A. | 1010 |
| B. | TO16 |
| C. | 1022 |
| D. | 1040 |
| Answer» D. 1040 | |
| 611. |
The ultimate tensile strength of low carbon steel by working at a high strain rate will |
| A. | decrease |
| B. | increase |
| C. | remain constant |
| D. | first increase and then decrease |
| Answer» C. remain constant | |
| 612. |
Mild steel belongs to the following category |
| A. | low carbon steel |
| B. | medium carbon steel |
| C. | high carbon steel |
| D. | alloy steel |
| Answer» B. medium carbon steel | |
| 613. |
The ability of a material to resist softening at high temperature is known as |
| A. | creep |
| B. | hot tempering |
| C. | hot hardness |
| D. | fatigue |
| Answer» D. fatigue | |
| 614. |
Ductility of a material can be defined as |
| A. | ability to undergo large permanent deformations in compression |
| B. | ability to recover its original form |
| C. | ability to undergo large permanent deformations in tension |
| D. | all of the above |
| Answer» D. all of the above | |