List of top Biomaterials Questions asked in GATE BM

A Wheatstone bridge is used to measure strain as shown in the figure below. 
Initially, the bridge was balanced. When a strain is applied to the resistor \( R_{{strain}} \), along its length, the output voltage \( V_{{out}} \) is 10 mV. If \( R_{{strain}} \) is a cylindrical resistor of length \( l \) and cross-sectional area \( A \), the magnitude of the applied strain is _______. 
(rounded off to two decimal places) 

 

The storage modulus \( G' \) of a collagen gel scales as \( G' \sim [C]^3 \), where [C] represents the collagen concentration in mg/ml. If the storage modulus of a 1 mg/ml collagen gel is 100 Pa, then the storage modulus of a 3 mg/ml collagen gel is _______ Pa. (rounded off to the nearest integer)
Strength (\(\sigma\)) of an implanted suture is given by the equation \[ \sigma = \sigma_0 - 2 \log_e(t) \quad {for} \quad t \geq 1, \] where \(\sigma_0\) represents the original strength and time \(t\) is measured in weeks. If the strength of the suture is 2 MPa at 4 weeks, what will be its strength (in MPa) at 8 weeks? (Rounded off to two decimal places)
In the context of temperature sensitive polymers, LCST stands for _______.
The storage modulus \( G' \) of a collagen gel scales as \( G' \sim [C]^3 \), where [C] represents the collagen concentration in mg/ml. If the storage modulus of a 1 mg/ml collagen gel is 100 Pa, then the storage modulus of a 3 mg/ml collagen gel is _______ Pa. (rounded off to the nearest integer)
Strength (\(\sigma\)) of an implanted suture is given by the equation \[ \sigma = \sigma_0 - 2 \log_e(t) \quad {for} \quad t \geq 1, \] where \(\sigma_0\) represents the original strength and time \(t\) is measured in weeks. If the strength of the suture is 2 MPa at 4 weeks, what will be its strength (in MPa) at 8 weeks? (Rounded off to two decimal places)
A Wheatstone bridge is used to measure strain as shown in the figure below.
Initially, the bridge was balanced. When a strain is applied to the resistor \( R_{{strain}} \), along its length, the output voltage \( V_{{out}} \) is 10 mV. If \( R_{{strain}} \) is a cylindrical resistor of length \( l \) and cross-sectional area \( A \), the magnitude of the applied strain is _______.
(rounded off to two decimal places)
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The Electroencephalogram (EEG) voltage measured by a test device is 2.4 µV, while the reference device measured it to be 3.0 µV. What is the percentage error of the test device?
Based on the stress-strain curves of three different materials (X, Y, and Z) shown in the figure, which one of the following choices is CORRECT?
Which of the following mechanical prosthetic valves were invented as a replacement for diseased heart valves?
An ideal coronary stent should

A novel biomaterial was tested for its tensile properties. The experiment was conducted using a cylindrical sample of this material, which was 10 cm long with 1 cm diameter. When a tensile force of 50 kN was applied, this cylindrical sample elongated by 4 mm. Based on the experimental results described above and the tensile moduli of different tissues given in the table below, this biomaterial would be a suitable replacement for \(\underline{\hspace{2cm}}\). 
\[\begin{array}{|c|c|} \hline \textbf{Tissue} & \textbf{Tensile modulus} \\ \hline \text{Bone} & \text{5 – 20 GPa} \\ \hline \text{Tendon} & \text{0.5 – 1 GPa} \\ \hline \text{Ligament} & \text{20 – 400 MPa} \\ \hline \text{Articular cartilage} & \text{3 – 10 MPa} \\ \hline \end{array}\]

Match the following in the context of biomaterial characterization: 

A polymeric scaffold has an initial weight of 20 mg. After 7 days in a lysozyme solution, its weight is reduced to 18 mg. The degradation of the polymeric scaffold after 7 days is \(\underline{\hspace{2cm}}\)%.
Which of the following may cause failure of bone implants?
As shown in the figure, the water contact angles of surfaces A and B are $\theta_A$ and $\theta_B$, respectively. Based on the figure, which of the following statements given below is TRUE?
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