List of top Physics Questions asked in MHT CET

A clock with an iron pendulum keeps the correct time at \(14^{\circ }\text{C}\). If the room temperature is \(20^{\circ }\text{C}\), the error in seconds per day will be nearly (coefficient of linear expansion of iron is \(1.2\times 10^{-5}/{}^{\circ }\text{C}\) )

Two spherical black bodies have radii \(R_{1}\) and \(R_{2}\). Their surface temperatures are \(T_{1}\) K and \(T_{2}\) K respectively. If they radiate the same power, the ratio \(\frac{R_{1}}{R_{2}}\) is

A body performs uniform circular motion with radius \(\vec{r}=4\hat{i}-2\hat{j}+2\hat{k}\) and angular velocity \(\vec{\omega }=2\hat{i}-3\hat{j}+\hat{k}\). The magnitude of linear velocity of the body is

Two identical copper spheres of radius R and density \(\varrho\) are placed in contact with each other. The gravitational force acting between them is proportional to \(\text{R}^{x}\). The value of \(x\) is

A body, performing uniform circular motion of radius 'r', has frequency 'n'. Its centripetal acceleration per unit radius is related as \((\text{n})^{x}\). The value of \(x\) is

A particle starting from rest moves along the circumference of a circle of radius \(r=\sqrt{2}\) m with an angular acceleration \(\alpha =\frac{\pi }{9}\) rad/s\({}^{2}\). The magnitude of its average velocity and instantaneous angular velocity in the time , it completes one fourth rotation, is respectively

A vehicle runs on a straight road of length 'L'. It travels half the distance with speed V and the remaining distance with speed \(\frac{3V}{2}\). Its average speed is

A student measures times for 20 oscillations of a simple pendulum as 30s, 32s, 35s and 31s. If the minimum division in the measuring clock is 1s, then correct mean time in second , within error limits , is

The output characteristics of a transistor in CE mode is the graph obtained by plotting

In semiconductors, at room temperature

Two radioactive materials A and B having decay constant '\(7\lambda\)' and '\(\lambda\)' respectively, initially have same number of nuclei. The time taken to have the ratio of number of nuclei of material B to that of A as '\(e\)', is

An electron of mass '\(m_{e}\)' and charge '\(e\)' revolving around the nucleus in \(n^{th}\) orbit has orbital magnetic moment \(\frac{enh}{4\pi m_{e}}\) which is equal to Bohr Magneton, the orbit number in which electron should revolve is (\(h\) = Planck's constant)

In hydrogen spectrum the ratio of wavelengths of the last line of Lyman series and the last line of Balmer series is

In Young's double slit experiment, in an interference pattern, third minimum is observed exactly in front of one of the slits. If '\(d\)' is the distance between the slits and '\(D\)' is the distance between the slits and the screen, the wavelength of light used is

An electron of mass '\(m\)' accelerated through a potential difference '\(V\)' has the de Broglie wavelength associated with it as '\(\lambda\)'. If a proton of a mass '\(M\)' is accelerated through the same potential difference '\(V\)', the de Broglie wavelength associated with it will be

When light of wavelength '\(\lambda\)' is incident on a photosensitive surface, the stopping potential is '\(V\)'. When light of wavelength '\(2\lambda\)' is incident on the same surface, the stopping potential is \(V/3\). Threshold wavelength for the surface is

A ray of light travels from a denser medium to a rarer medium. The reflected and the refracted rays are perpendicular to each other. If \(r\) and \(r'\) are angles of reflection and refraction respectively, then the angle of incidence \(i\) is equal to \([C\) = critical angle \(]\)

In a single slit diffraction pattern, identify the incorrect statement from the following

A series L-C-R circuit is connected to a source of alternating emf of \(50\ \text{V}\). The potential difference across inductor and capacitor is \(80\ \text{V}\) and \(50\ \text{V}\) respectively. The potential difference across the resistor is

In Young's double slit experiment, the intensity on screen at a point, where path difference is '\(\lambda /4\)', is '\(K/4\)'. The intensity at a point when path difference is '\(\lambda\)' will be \([\cos (\pi /4)=1/\sqrt{2},\ \cos (\pi /2)=0,\ \cos (2\pi )=1]\)

In series LCR circuit, \(R=10\ \Omega\) and impedance is \(30\ \Omega\). An rms voltage \(210\ \text{V}\) is applied across the circuit. The true power consumed in A.C. circuit in watt is

Two identical long parallel wires carry current '\(I_{1}\)' and '\(I_{2}\)' such that \(I_{1}>I_{2}\). When the currents are in the same direction, the magnetic field at a point midway between the wires is \(6\times 10^{-6}\ \text{T}\). If the direction of '\(I_{2}\)' is reversed, the field becomes \(3\times 10^{-5}\ \text{T}\). The ratio \(\left(\frac{I_{1}}{I_{2}}\right)\) is

If '\(N\)' is the number of turns in a circular coil, the value of its self-inductance varies as

Two coils P and S have a mutual inductance of \(5\times 10^{-3}\ \text{H}\). If the current in the primary (P) is \(I=10\,\sin (100\pi t)\), then the maximum value of e.m.f. induced in S is (in volt)

The magnetic flux through a coil of resistance \(R\) changes by an amount \(\Delta \Phi\) in the time \(\Delta t\). The total quantity of electric charge (\(Q\)) induced is