Question Bank Directory

Identify the correct order of the size of the following species: Ca²⁺, K⁺, Ar, S²⁻, Cl⁻

The decreasing order of the wavelength of infrared, microwave, ultraviolet and gamma rays is:

The electric and the magnetic field, associated with an electromagnetic wave, propagating along the $+z$-axis, can be represented by:

In Young's double-slit experiment, a student observes 8 fringes in a certain segment of the screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

Unit of energy in SI system is

Light with an energy flux of $25 \times 10^4 \text{ W m}^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15 \text{ cm}^2$, the average force exerted on the surface is:

The length of the string of a musical instrument is $90\text{ cm}$ and has a fundamental frequency of $120\text{ Hz}$. Where should it be pressed to produce a fundamental frequency of $180\text{ Hz}$?

If an unpolarised light is incident on a plane surface of refractive index √3 at Brewster's angle, then the angle of refraction is:

Henry/ohm can be expressed in:

In a guitar, two strings $A$ and $B$ made of same material are slightly out of tune and produce beats of frequency $6 \text{ Hz}$. When tension in $B$ is slightly decreased, the beat frequency increases to $7 \text{ Hz}$. If the frequency of $A$ is $530 \text{ Hz}$, the original frequency of $B$ will be:

If $P$ represents radiation pressure, $c$ represents speed of light and $Q$ represents radiation energy striking a unit area per second, then non-zero integers $x, y$ and $z$ such that $P^x Q^y c^z$ is dimensionless, are

The period of a body under SHM is presented by $T = P^a D^b S^c$; where $P$ is pressure, $D$ is density and $S$ is surface tension. The value of $a$, $b$ and $c$ are:

The dimensions of universal gravitational constant are

The correct order of increasing electron gain enthalpy with a negative sign for the elements O, S, F, and Cl is:

If energy ($E$), velocity ($v$) and time ($T$) are chosen as the fundamental quantities, the dimensional formula of surface tension will be:

The frequency of vibration f of a mass m suspended from a spring of spring constant K is given by a relation of this type f = C m^x K^y; where C is a dimensionless quantity. The value of x and y are:

Three capacitors each of capacitance $C$ and of breakdown voltage $V$ are joined in series. The capacitance and breakdown voltage of the combination will be:

Out of the following, the only pair that does not have identical dimensions is

The unit of thermal conductivity is:

Which is the correct thermal stability order for $H_2E$ (E = O, S, Se, Te and Po)?