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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Two exactly similar wires of steel and copper are stretched by equal force. If the total elongation is 2 cm, then how much is the elongation in steel and copper wire respectively? Given, `Y_("steel")=20xx10^(11)"dyne/cm"^(2),Y_("copper")=12xx10^(11)"Dyne/cm"^(2)`A. `1.25cm, 0.75cm`B. `0.75cm, 1.25cm`C. `1.15cm, 0.85cm`D. `0.5cm, 1.15cm` |
| Answer» Correct Answer - B | |
| 152. |
A spherical ball contracts in volume by 0.01% when subjected to a normal uniform pressure of 100 atmospheres. Calculate the bulk modulus of the meterial.A. `1.01xx10^(11Nm^(-2)`B. `1.01xx10^(12)Nm^(-2)`C. `1.01xx10^(10)Nm^(-2)`D. `1.01xx10^(13)Nm^(-2)` |
| Answer» Correct Answer - A | |
| 153. |
When a body is under certain stress, is it equilibrium ? |
| Answer» Correct Answer - Yes | |
| 154. |
What is the dimensional formula of tensile stress? |
| Answer» Correct Answer - `[M^(1)L^(-1)T^(-2)]` | |
| 155. |
Two springs of spring constants `1500N//m` and `3000N//m` respectively are streched by the same force. The potential energy gained by the two springs will be in the ratio |
| Answer» From `W = (F^(2))/(2K)`, if force `F` is same on two springs `W alpha (1)/(K)` or `U alpha (1)/(K), (U_(1))/(U_(2)) = (K_(2))/(K_(1)) = (3000)/(1500) = (2)/(1)` | |
| 156. |
A `20kg `load is suspended by a wire of cross section `0.4mm^(2)`. The stress produced in `N//m^(2)` isA. `4.9xx10^(-6)`B. `4.9xx10^(8)`C. `49xx10^(8)`D. `2.45xx10^(-6)` |
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Answer» Correct Answer - B Stress `= F//A, F = Mg` |
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| 157. |
A wire whose cross-sectional area is `4mm^(2)` is streched by `0.1mm` by a certain load. If a similar wire of double the area of cross-section is under the same load, then the elongation would beA. `0.5mm`B. `0.05mm`C. `0.005mm`D. `5mm` |
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Answer» Correct Answer - B `e = (Fl)/(AY) = (Mgl)/(AY), e alpha (1)/(A)` |
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| 158. |
The potential energy of a spring when stretched by `2cm is U` if the spring is stretched by `8cm` the potential energy in it isA. `8U`B. `16U`C. `4U`D. `U` |
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Answer» Correct Answer - B `U = (1)/(2) K x^(2)` |
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