List of top Questions asked in KEAM- 2018

When \(SO_2\) gas is passed into aqueous \(Na_2CO_3\) the product(s) formed is(are)

Portland cement does not contain

\(Al_2(SO_4)_3\) is used in the following but not

Maximum number of covalent bonds formed by N and P are

An alternating voltage $V=V_0\sin\omega t$ is applied across a circuit and as a result, a current $I=I_0\sin\left(\omega t+\frac{\pi}{2}\right)$ flows in it. The power consumed per cycle is

An electromagnetic wave of intensity $I$ is incident on a non-reflecting surface. If $C$ is the speed of light in free space, then, the ratio $\frac{I}{C}$ is same as

Which element has the highest first ionization potential?

Which statement(s) is(are) false for the periodic classification of elements?

Gd(64) has __________ unpaired electrons with sum of spin __________

The electronegativities of N, C, Si and P are in the order

A radio transmitter sends out 60 W of radiation. Assuming that the radiation is uniform on a sphere with the transmitter at its centre, the intensity (in W/m\(^2\)) of the wave at a distance 12 km is

The magnitude of a magnetic field at the centre of a circular coil of radius R, having N turns and carrying a current I can be doubled by changing

In the given circuit P and Q form the inputs. The output $Y$ is

Consider a system of gas of a diatomic molecule in which the speed of sound at $0^\circ\text{C}$ is 1260 $\text{ms}^{-1}$. Then, the molecular weight of the gas is (Given the gas constant $R=8.314\,\text{J mol}^{-1}\text{K}^{-1}$)

A satellite is orbiting the earth in a circular orbit of radius R. Which one of the following statements is true ?

A prism is made up of material of refractive index $\sqrt{2}$. The angle of the prism is $A$. If the angle of minimum deviation is equal to the angle of the prism, the value of $A$ is

Three variable Boolean expression $PQ+PQR+\bar{P}Q+\bar{P}\bar{Q}R$ can be written as

If the emission rate of blackbody at $0^\circ\text{C}$ is $R$ then, the rate of emission at $273^\circ\text{C}$ is

For any material, if R, T and A represent the reflection coefficient, transparent coefficient and absorption coefficient respectively, then, for a blackbody which one of the following is true ?

Consider a cylindrical conductor of length $L$ and area of cross section $A$. The specific conductivity varies as $\sigma(x)=\sigma_0\frac{L}{\sqrt{x}}$ where $x$ is the distance along the axis of the cylinder from one of its ends. The resistance of the system along the cylindrical axis is

An electron is moving with a velocity $2 \times 10^6$ m/s along positive $x$-direction in the uniform electric field of $8 \times 10^7$ V/m applied along positive $y$-direction. The magnitude and direction of a uniform magnetic field (in Tesla) that will cause the electrons to move undeviated along its original path is

The electrical conductivity of a metal is

The 6 V Zener diode shown in figure has negligible resistance and a knee current of 5 mA. The minimum value of $R$ (in $\Omega$) so that the voltage across it does not fall below 6 V is

Two particles A and B of same mass have their total energies $E_A$ and $E_B$ in the ratio $E_A : E_B = 1 : 2$. Their potential energies $U_A$ and $U_B$ are in the ratio $U_A : U_B = 1 : 2$. If $\lambda_A$ and $\lambda_B$ are their de Broglie wavelengths, then $\lambda_A : \lambda_B$ is

What is the minimum thickness (in nm) of a soap film ($n = 1.3$) that results in constructive interference in reflected light if the film is illuminated with light whose wavelength in free space is 620 nm?