List of top Nano Technology Questions

A plane wall of thickness $0.1\text{ m}$ and thermal conductivity $50\text{ W/m}\cdot\text{K}$ has a surface area of $2\text{ m}^2$. The temperature difference across the wall is $100\text{ K}$. What is the rate of heat transfer through the wall?

Diamagnetic materials are:

A material loses its strong magnetization suddenly at a critical temperature and becomes weakly magnetic. This transition is from

The 'Fugacity Coefficient ($\phi = f/P$)' of a real gas approaches unity when

Ferromagnetic materials show:

According to equation of continuity,

Assertion (A): Gibbs free energy determines spontaneity at constant T and P.
Reason (R): A process is spontaneous when Gibbs free energy is minimum.

According to the Boltzmann Equation $S = k_B \ln \Omega$, if a system is in a state of "Perfect Order" (a perfect crystal at $0\text{ K}$), the number of microstates $\Omega$ and the entropy $S$ are

Which combination gives highest strength-to-weight ratio?

If $\Delta U = 100\text{ J}$ and work done = $40\text{ J}$, heat supplied is:

The "Glassy" state in ceramics is characterized as

If two forces acting at a joint are not along the straight line, then for the equilibrium of the joint

Transparency of glass is due to

Centroid of triangle lies at:

Which of the following statements is FALSE?

Vacancy diffusion coefficient: $D = D_0 \exp(-Q/RT)$

Efficiency of Carnot engine is always:

Which of the following materials possesses anti-parallel spins of unequal magnitude, resulting in a spontaneous magnetic moment below a critical temperature?

Which of the following has the highest thermal diffusivity:

At 0K, an intrinsic semiconductor behaves like a:

Thermosetting polymers differ from Thermoplastics primarily because

The forces of $60\text{ N}$ and $80\text{ N}$ are in equilibrium at a point, acting at an angle of $90^\circ$ to each other. Find the magnitude of the third force?

Total recoverable strain energy stored within the elastic limit in the stress-strain curve is called-

An activity represents:

Consider an adiabatic process in which a gas is compressed. Which of the following statements is strictly CORRECT regarding the energy transfer?