List of top Physics Questions asked in MHT CET

In a step-up transformer, if the voltage in the secondary is increased, then the current in the primary:

Unpolarized light of intensity \(I_{0}\) is made to pass through three polarizers \(P_{1}\), \(P_{2}\) and \(P_{3}\) successively. The polarization axis of \(P_{2}\) makes an angle of \(60^{\circ }\) with that of \(P_{1}\), while that of \(P_{3}\) makes an angle of \(45^{\circ }\) with that of the \(P_{2}\). If \(I_{0}=xI_{3}\), the value of '\(x\)' is \(\left(\cos 45^{\circ }=\frac{1}{\sqrt{2}},\,\cos 60^{\circ }=\frac{1}{2}\right)\)

When a \(60\) mH inductor and resistor are connected in series with an AC source, the voltage leads the current by \(60^{\circ }\). If the inductor is replaced by a \(0.5\ \mu\)F capacitor, the voltage lags behind the current by \(30^{\circ }\). The frequency (in Hz) of AC supply is \(\left(\tan 30^{\circ }=\frac{1}{\sqrt{3}},\,\tan 60^{\circ }=\sqrt{3}\right)\)

At resonance, the LC parallel resonant circuit

The self-inductance L of a toroid having circular cross-section of radius \(r\) and major radius \(R\) is (\(r\ll R\))

A series LCR circuit is connected to an AC source of \(220\) V, \(50\) Hz. The circuit contains resistance of \(100\ \Omega\), capacitor of capacitive reactance \(X_{C}\ \Omega\) and inductor of inductive reactance \(X_{L}=150\ \Omega\). If the power factor of the circuit is \(\frac{8}{10}\) and, \(X_{L}>X_{C}\), then the value of \(X_{C}\) is

A parallel-plate air capacitor has a capacity '\(C\)', a separation '\(x\)', a dielectric material with a dielectric constant '\(k\)' between plates, and a potential difference of '\(V\)' volt applied between plates. The force of attraction between the plates is

A closely wound solenoid of \(1000\) turns and area of cross-section \(2\times 10^{-4}\ \text{m}^{2}\) carries a current of \(2\) A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field \(5\times 10^{-2}\) T making an angle of \(60^{\circ }\) with the axis of solenoid. The torque on a solenoid will be nearly \(\left(\sin 60^{\circ }=\frac{\sqrt{3}}{2}\right)\)

A galvanometer of resistance '\(G\)', is shunted by a resistance '\(S\)' ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

In a Wheatstone's metre bridge, resistances \(R\) and \(S\) are connected in left and right gap, null point is obtained as \(l\). After interchanging the resistances in the gaps, null point shifts to the left by \(20\) cm. If the series resistance of \(R\) and \(S\) is \(2\ \text{k}\Omega\), then the value of resistance \(R\) is

A long straight wire along the \(z\)-axis carries a current '\(I\)' in the negative z-direction. The magnetic induction '\(\vec{B}\)' at a point having co-ordinates \((x,y)\) on the \(z=0\) plane is

The magnetic induction produced at the centre of the air-core solenoid is \(B_{0}\). If the air-core is replaced by an iron-core of susceptibility \(\chi\), the magnetic induction is \(B_{1}\). The ratio of \(\frac{B_{1}}{B_{0}}\) is

Assume that an electric field \(\vec{E}=30x^{2}\hat{i}\) N/C exists in space. If \(V_{0}\) is the potential at the origin and \(V_{A}\) is the potential at \(x=2\) m, then the potential difference \(V_{A}-V_{0}\) is

Equipotential surfaces associated with an electric field that is increasing in magnitude along the positive Y-direction are

A charge \(Q\) is divided into two parts and placed at a given distance so that the force between them is maximum. The value of each charge is:

In the context of the Doppler effect in sound, which statement is true regarding the wave speed in the medium?

If two waves \(y_{1}=A\sin (\omega t-0.1x)\) and \(y_{2}=A\sin \left(\omega t-0.1x-\frac{\phi }{2}\right)\) are superimposed on each other, then the resultant amplitude due to superposition of waves is

In a resonance tube experiment, three successive resonances are produced by adjusting the air column of the tube in the ratio \(1:5:x\). If the frequency of tuning fork is \(380\) Hz and velocity of sound at \(27^{\circ }\) C is \(340\) m/s, then the value \(x\) is

When a particle in linear S.H.M. completes two oscillations, its phase changes by

A particle executes S.H.M. between \(x=-A\) and \(x=+A\). The time taken for it to go from mean position O to \(\frac{A}{2}\) is \(T_{1}\) and to go from \(\frac{A}{2}\) to \(A\) is \(T_{2}\), then (\(\sin 30^{\circ }=1/2\), \(\sin 90^{\circ }=1\))

There is a large difference between the frequencies of the external periodic force and the natural frequency of a body. The body will

If the pressure of the gas is kept constant, then the mean free path (\(\lambda\)) of a gas varies with temperature (\(T\)) according to relation

The total internal energy of one mole of HCl molecule is (assume the molecule to be non-rigid)

The pressure at the bottom of a water tank is NOT proportional to

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