COMEDK 2023 Morning Shift

The height vertically above the earth's surface at which the acceleration due to gravity becomes \(1 \%\) of its value at the surface is

The mean energy per molecule for a diatomic gas is

A gas is taken through the cycle \(A \rightarrow B \rightarrow C \rightarrow A\), as shown in figure. What is the net work done by the gas?

The gases carbon monoxide \((\mathrm{CO})\) and nitrogen at the same temperature have kinetic energies \(E_1\) and \(E_2\), respectively. Then,

An ideal gas goes from state \(A\) to state \(B\) via three different processes as indicated in the \(p\)-\(V\) diagram. If \(Q_1, Q_2\) and \(Q_3\) indicate the heat absorbed by the three processes and \(\Delta U_1, \Delta U_2\) and $$\Del...

If \(150 \mathrm{~J}\) of heat is added to a system and the work done by the system is \(110 \mathrm{~J}\), then change in internal energy will be

Two slabs are of the thicknesses \(d_1\) and \(d_2\). Their thermal conductivities are \(K_1\) and \(K_2\), respectively. They are in series. The free ends of the combination of these two slabs are kept at temperatures \(\theta_1\) and $$\t...

A cylinder of radius \(r\) and of thermal conductivity \(K_1\) is surrounded by a cylindrical shell of inner radius \(r\) and outer radius \(2 r\) made of a material of thermal conductivity \(K_2\). The effective thermal conductivity of the...

If \(\theta_1\) and \(\theta_2\) be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of \(\operatorname{dip} \theta\) is given by

A body is projected vertically upwards. The times corresponding to height \(h\) while ascending and while descending are \(t_1\) and \(t_2\), respectively. Then, the velocity of projection will be (take, \(g\) as acceleration due to gravity...

A car starts from rest and accelerates uniformly to a speed of \(180 \mathrm{~kmh}^{-1}\) in \(10 \mathrm{~s}\). The distance covered by the car in this time interval is

A ball is projected horizontally with a velocity of \(5 \mathrm{~ms}^{-1}\) from the top of a building \(19.6 \mathrm{~m}\) high. How long will the ball take to hit the ground?

Two very long straight parallel wires carry currents \(i\) and \(2 i\) in opposite directions. The distance between the wires is \(r\). At a certain instant of time a point charge \(q\) is at. a point equidistant from the two wires in the p...

A straight wire of length \(2 \mathrm{~m}\) carries a current of \(10 \mathrm{~A}\). If this wire is placed in uniform magnetic field of \(0.15 \mathrm{~T}\) making an angle of \(45^{\circ}\) with the magnetic field, the applied force on th...

A square wire of each side l carries a current \(I\). The magnetic field at the mid-point of the square

An air bubble in water \(\left(\mu=\frac{4}{3}\right)\) is shown in figure. The apparent depth of the image of the bubble in plane mirror viewed by observer is.

A fish in water (refractive index \(n\) ) looks at a bird vertically above in the air. If \(y\) is the height of the bird and \(x\) is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

A thin circular ring of mass ,\(M\) and radius \(R\) rotates about an axis through its centre and perpendicular to its plane, with a constant angular velocity \(\omega\). Four small spheres each of mass \(m\) (negligible radius) are kept ge...

A transistor is connected in CE configuration. The collector supply is \(10 \mathrm{~V}\) and the voltage drop across a resistor of \(1000 \Omega\) in the collector circuit is \(0.5 \mathrm{~V}\). If the current gain factor is 0.96 , then t...

Which logic gate is represented by the following combination logic gates?

An LED is constructed from a \(p\)-\(n\) junction diode using GaAsP. The energy gap is \(1.9 \mathrm{~eV}\). The wavelength of the light emitted will be equal to

The phase difference between displacement and velocity of a particle in simple harmonic motion is

The sides of a parallelogram are represented by vectors \(\vec{p}=5 \hat{\mathbf{i}}-4 \hat{\mathbf{j}}+3 \hat{\mathbf{k}}\) and \(\vec{q}=3 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-\hat{\mathbf{k}}\). Then, the area of the parallelogram is

In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3 . Then, the value of the ratio of the amplitudes of the wave that arrive there is

In Young's double slit experiment, the ratio of maximum and minimum intensities in the fringe system is \(9: 1\). The ratio of amplitudes of coherent sources is

With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the actual frequency?

A car is moving towards a high cliff. The car driver sounds a horn of frequency \(f\). The reflected sound heard by the driver has a frequency \(2 f\). If \(v\) be the velocity of sound, then the velocity of the car in the same velocity uni...

A string vibrates with a frequency of \(200 \mathrm{~Hz}\). When its length is doubled and tension is altered, it begins to vibrate with a frequency of \(300 \mathrm{~Hz}\). The ratio of the new tension to the original tension is

A particle is projected at an angle \(30^{\circ}\) with horizontal having kinetic energy \(K\). The kinetic energy of the particle at highest point is.

A long spring, when stretched by a distance \(x\), has potential energy \(U\). On increasing the stretching to \(n x\), the potential energy of the spring will be