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This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Manufacturing Engineering knowledge and support exam preparation. Choose a topic below to get started.
1. |
With an increase in temperature, the resistance of a semiconductor ____________ |
A. | increases |
B. | decreases |
C. | remains Constant |
D. | first increases and then decreases |
Answer» C. remains Constant | |
2. |
If a copper wire of 10 m length having 0.44mm diameter has resistance of 2 Ohm, then what will be the specific resistance (in Ohm-m)? |
A. | 1.520 × 10-8 |
B. | 3.041 × 10-8 |
C. | 1.520 × 10-6 |
D. | 1.520 × 10-5 |
Answer» C. 1.520 × 10-6 | |
3. |
If a copper wire of 200 m length having 0.44mm diameter has resistance of 20 Ohm, then find its specific resistance (in Ohm-m). |
A. | 1.520 × 10-8 |
B. | 1.520 × 10-7 |
C. | 1.520 × 10-6 |
D. | 1.520 × 10-5 |
Answer» B. 1.520 × 10-7 | |
4. |
What is the energy gap (Eg) of a metal? |
A. | Eg < 3 ev |
B. | Eg < 1 ev |
C. | Eg > 1 ev |
D. | Eg > 3 ev |
Answer» C. Eg > 1 ev | |
5. |
What is the energy gap (Eg) of an insulator? |
A. | Eg < 3 ev |
B. | Eg < 1 ev |
C. | Eg < 0 ev |
D. | Eg > 3 ev |
Answer» E. | |
6. |
What is the resistivity of bismuth (in Ohm-m) at room temperature? |
A. | 1.29 × 10-6 |
B. | 1.29 × 10-3 |
C. | 1.29 × 10-5 |
D. | 1.29 × 10-9 |
Answer» B. 1.29 × 10-3 | |
7. |
What is the resistivity of iron (in Ohm-m) at room temperature? |
A. | 9.71 × 10-2 |
B. | 9.71 × 10-8 |
C. | 9.71 × 10-5 |
D. | 9.71 × 10-9 |
Answer» C. 9.71 × 10-5 | |
8. |
What is the resistivity of silver (in Ohm-m) at room temperature? |
A. | 1.59 × 10-2 |
B. | 1.59 × 10-3 |
C. | 1.59 × 10-5 |
D. | 1.59 × 10-9 |
Answer» E. | |
9. |
With an increase in the mean free path of electrons, materials conductivity ____________ |
A. | increases |
B. | decreases |
C. | remains constant |
D. | first increases and then decreases |
Answer» B. decreases | |
10. |
Which of the following is the de Broglie’s equation (λ = wavelength, v = velocity, m = mass, h = Planck’s constant)? |
A. | λ = h/mv |
B. | λ = h/m |
C. | λ = h/v |
D. | λ = mv/h |
Answer» B. λ = h/m | |
11. |
RESISTANCE_OF_A_10_METER_LONG_COOPER_WIRE_IS_EQUAL_TO_2_OHM._ITS_DIAMETER_IS_0.44MM._ITS_SPECIFIC_RESISTANCE_IN_OHM-M_IS_EQUAL_TO_:?$ |
A. | 1.520 * 10<sup>-8</sup> |
B. | 3.041* 10<sup>-8</sup> |
C. | 1.520 * 10<sup>-6</sup> |
D. | 1.520 * 10<sup>-5</sup> |
Answer» C. 1.520 * 10<sup>-6</sup> | |
12. |
With an increase in temperature of a semiconductor, resistance of semiconductor.$ |
A. | Increases |
B. | Decreases |
C. | Remains Constant |
D. | None of the mentioned |
Answer» C. Remains Constant | |
13. |
Resistance of a 200 meter long cooper wire is equal to 20 ohm. Its diameter is 0.44mm. Its specific resistance in ohm-m is equal to ? |
A. | 1.520 * 10<sup>-8</sup> |
B. | 1.520 * 10<sup>-7</sup> |
C. | 1.520 * 10<sup>-6</sup> |
D. | 1.520 * 10<sup>-5</sup> |
Answer» B. 1.520 * 10<sup>-7</sup> | |
14. |
Which of the following equation may represent the property of metal, if Eg stands for energy gap in electron volt? |
A. | E<sub>g</sub> < 3 |
B. | E<sub>g</sub> < 1 |
C. | E<sub>g</sub> > 1 |
D. | E<sub>g</sub> > 3 |
Answer» C. E<sub>g</sub> > 1 | |
15. |
For insulators value of Energy gap in electron Volt i.e. eV ranges as : |
A. | E<sub>g</sub> < 3 |
B. | E<sub>g</sub> < 1 |
C. | E<sub>g</sub> > 1 |
D. | E<sub>g</sub> > 3 |
Answer» E. | |
16. |
Resistivity of silver in ohm-m has an order of : |
A. | 10<sup>-2</sup> |
B. | 10<sup>-3</sup> |
C. | 10<sup>-5</sup> |
D. | 10<sup>-9</sup> |
Answer» E. | |
17. |
With an increase in the mean free path of a crystal, conductivity of a crystal. |
A. | Increases |
B. | Decreases |
C. | Remains constant |
D. | None of the mentioned |
Answer» B. Decreases | |
18. |
Which of the following is the correct equation for De Broglie’s wavelength λ? |
A. | λ=h /mv |
B. | λ=h /m |
C. | λ=h /v |
D. | λ=mv/ h |
Answer» B. ‚âà√≠¬¨‚Ñ¢=h /m | |