Recent questions

A differential scanning calorimetry $\text{(DSC)}$ experiment tracks the heat flow into or out of a system as a function of temperature. If the experiments given in the o...

Which one of the following solvent environments will likely result in swelling of solid polystyrene? $0.1 \mathrm{M} \mathrm{NaOH}$ in $\mathrm{H}_{2} \mathrm{O}$$\mathr...

Vickers microhardness $\text{(HV)}$ of a ductile material $\text{A}$ is higher than another ductile material $\text{B}$. Which of the following is/are true? Young's modul...

The enthalpy required to create an oxygen vacancy in $\mathrm{CeO}_2$ is $4 \mathrm{eV}$. The number of oxygen vacancies present per mole of $\mathrm{CeO}_2$ at $1000 \ma...

An electrochemical reaction is known to occur at $+4.50 \mathrm{~V}$ against a $\mathrm{Li}^{+} / \mathrm{Li}$ reference electrode. The potential of the same reaction aga...

For a binary system at constant pressure, there are two types of invariant reactions:(i) $\quad \alpha \leftrightarrow \beta+\gamma$(ii) $\quad \alpha+\beta \leftrightarr...

For a glass marginally below its glass transition temperature, which one of the following statements is true?Glass has higher enthalpy than both the corresponding crystal...

Which one of the following samples of high-purity aluminium (Al) single crystal will plastically yield at the lowest applied load under ambient conditions? Loading axis i...

Refer to the schematic shown. Two dog-bone samples, labelled 1 and 2 , of a Cualloy are tested under tension at room temperature to points "E" and "P", respectively. Subs...

During the ageing of a homogenized Al-Cu alloy $(1 \text{to} 4$ $\mathrm{wt} \% \mathrm{Cu})$ below the GP zone solvus, hardness of the alloy:increases monotonicallydecre...

A student aims to deposit a thin metallic film on $\mathrm{SiO}_{2}$ substrate, with an adhesion layer between the metal film and substrate, in a contiguous planar fashio...

For a diffusional transformation $\text{(i.e., growth of $\beta$ precipitates in an $\alpha$ matrix)}$, which of the following is/are true with increasing degree of under...

A two-phase $(\alpha+\beta)$ mixture of an $\text{A-B}$ binary system has the following properties:Phase $\alpha$ has equal weight percentages of $\mathrm{A}$ and $\mathr...

It is known that component A diffuses into a solid to a depth of $10 \mu \mathrm{m}$ in 1 hour at $300 \mathrm{~K}$. Treat diffusion in one dimension. The time taken for ...

A spherical $\beta$ particle nucleates from the $\alpha$ matrix on a non-deformable substrate \end{tabular} $\delta$, forming a contact angle of $\theta$ as shown in the ...

The resistivity of a pure semiconductor at $298 \mathrm{~K}$ is $3000 \Omega \mathrm{m}$. Assume that the number of electrons excited $\left(n_{e}\right)$ across the band...

A new glass material is developed to minimize the transmission of the light through the window with glass panel of thickness $5 \mathrm{~mm}$. The refractive index of the...

The third peak in the X-ray diffraction pattern of a face-centered cubic crystal is at $2 \theta$ value of $45^{\circ}$, where $2 \theta$ is the angle between the inciden...

The movie was funny and I __________.could help laughing couldn't help laughedcouldn't help laughingcould help laughed

$x: y: z=\frac{1}{2}: \frac{1}{3}: \frac{1}{4}$.What is the value of $\frac{x+z-y}{y}$ ?$0.75$$1.25$$2.25$$3.25$

Both the numerator and the denominator of $\frac{3}{4}$ are increased by a positive integer, $x$, and those of $\frac{15}{17}$ are decreased by the same integer. This ope...

A survey of $450$ students about their subjects of interest resulted in the following outcome.- $150$ students are interested in Mathematics.- $200$ students are interest...

For the picture shown above, which one of the following is the correct picture representing reflection with respect to the mirror shown as the dotted line?

In the last few years, several new shopping malls were opened in the city. The total number of visitors in the malls is impressive. However, the total revenue generated t...

In a partnership business the monthly investment by three friends for the first six months is in the ratio $3: 4: 5$. After six months, they had to increase their monthly...

Consider the following equations of straight lines:$\text { Line L1: } 2 x-3 y=5$$\text { Line L2: } 3 x+2 y=8$$\text { Line L3: } 4 x-6 y=5$$\text { Line L4: } 6 x-9 y=6...

Given below are two statements and four conclusions drawn based on the statements.Statement 1: Some soaps are clean.Statement 2: All clean objects are wet.Conclusion I: S...

An ant walks in a straight line on a plane leaving behind a trace of its movement. The initial position of the ant is at point $\mathrm{P}$ facing east.The ant first turn...