List of top Physics Questions asked in MHT CET

For an isochoric process, which of the following statements is NOT true?

For the Carnot heat engine, if the temperature of the hot reservoir is increased, then efficiency of the Carnot engine

Two spherical stars, A and B emit black body radiation. The radius of star A is \(400\) times that of star B and star A emits power \(10^{4}\) times emitted from star B. \(\lambda _{A}\) and \(\lambda _{B}\) are the wavelengths at which the peak occurs in their respective radiation curves such that \(\lambda _{A}=x\lambda _{B}\). The value of \(x\) is

A thin rod of mass '\(m\)' and length '\(2l\)' is made to rotate about an axis passing through its center and perpendicular to its length. If the angular velocity changes from \(0\) to \(\omega\) in time '\(t\)', then the torque acting on it is

According to Kepler's second law of planetary motion, the magnitude of areal velocity \(\left(\frac{\Delta A}{\Delta t}\right)\) of a planet of mass '\(m\)' revolving around the sun is constant and is equal to ('\(p\)' is the linear momentum and '\(L\)' is the angular momentum)

If the soluble impurity is added to a solvent, then the angle of contact

The speed of wind over the wings of a small aeroplane is \(70\) m/s and below the wings is \(60\) m/s. If the mass of the aeroplane is \(1000\) kg and the area of wing is \(14\ \text{m}^{2}\), then the net vertical force on the aeroplane will be (density of air \(=1.2\ \text{kg/m}^{3}\) and \(g=10\ \text{m/s}^{2}\))

The metre scale is used to measure the volume of a block. The measured length is \(10\) cm, breadth is \(20\) cm and height is \(25\) cm. The percentage error in the measurement of volume of a block is… (least count of metre scale \(=1\)mm)

A ball is thrown vertically downwards from a height of \(30\) m with initial velocity \(V_{0}\). It collides with the ground and loses \(60\ \%\) of its energy in collision and rebounds to \(20\) m. The initial velocity \(V_{0}\) is (\(g=10\ \text{m/s}^{2}\)).

A uniform disc of mass '\(m\)' and radius '\(R\)' is rolling up a rough inclined plane which makes an angle of \(30^{\circ }\) with the horizontal. If the coefficient of friction is \(\mu\) and only forces acting are gravitational and frictional, then the magnitude of the frictional force '\(f\)' is \(\left(\sin 30^{\circ }=\frac{1}{2}\right)\)

Two small bodies of different masses are projected upwards with the same velocity but making angle of projection of \(30^{\circ }\) and \(60^{\circ }\) with the horizontal. Both these bodies will

A child is standing with folded hands at the centre of the platform rotating about its central axis. The rotational kinetic energy of the system is '\(K\)'. The child now stretches his arms so that the moment of inertia of the system doubles. The rotational kinetic energy of the system now is '\(K_{1}\)'. The ratio \(K_{1}/K\) is

The area of a triangle formed by vectors \(\vec{P}=(3\hat{i}-4\hat{j}+2\hat{k})\) m and \(\vec{Q}=(\hat{i}+\hat{j}-2\hat{k})\) m as adjacent sides is approximately

A p-n junction photodiode is fabricated from a semiconductor with a band gap of \(4\times 10^{-19}\) J. It can detect a signal of wavelength
\([h=6.6\times 10^{-34}\text{Js},C=3\times 10^{8}\text{ m/s}]\)

In good conductor, the gap between the valence band and the conduction band is

A photon of energy 8 eV is incident on a metal surface of work function 3.75 eV. The stopping potential of the metal is

In the Bohr model, an electron moves in circular orbit around the proton. Considering an orbiting electron to be a circular current loop, the magnetic moment of the hydrogen atom, when the electron is in n\({}^{th}\) state, is

A common example of \(\beta ^{-}\) decay is
\({}_{15}\text{P}^{32}\longrightarrow {}_{16}\text{S}^{32}+x+y\)
Then x and y , respectively, stand for

Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringewidths recorded are \(W_{G}\), \(W_{R}\) and \(W_{B}\) respectively. Then

Let \(E_{e}\) and \(E_{p}\) represent kinetic energy of electron and photon respectively. If de-Broglie wavelength \(\lambda _{p}\) of a photon is four times the de-Broglie wavelength \(\lambda _{e}\) of an electron, then \(\frac{E_{p}}{E_{e}}\) is
[ speed of electron \(=\frac{C}{100}\) , C = velocity of light]

In a series LCR circuit, the inductance L is 10 mH, capacitance C is 100\(\mu\)F and resistance R is 20 \(\Omega\). The frequency at which impedance is 20 \(\Omega\), is

A ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickness 't' and refractive index 'n' is introduced in its path, then the optical path

Average e.m.f. of 2.4 V is induced in a coil when a current in it is changed from 10 A in one direction to 10 A in opposite direction in 0.4 second. The self inductance of the coil is

When light waves travel from rarer medium to denser medium, the quantities which get changed are

A convex lens of focal length 'f' produces a real image whose size is 'm' times the size of an object. The distance of the image from the lens, 'v', is given by