List of top Physics Questions asked in MHT CET

A wire of length \(l\) in the form of a square loop is in a plane normal to magnetic field B. If the length of the wire is decreasing at the rate \(\frac{dl}{dt}\), the e.m.f. induced is \(e_{1}\). If this wire is converted into a circular loop, the e.m.f. induced in a circular loop is \(e_{2}\). Then \(\frac{e_{1}}{e_{2}}\) is

There are four lightweight rod samples P, Q, R and S separately suspended by thread. A bar magnet is slowly brought near to each sample and the following observations are noted
(a) P is weakly repelled
(b) R is strongly attracted
(c) S remains unaffected
(d) Q is weakly attracted
Which of the following is true?

Three identical parallel plate air capacitors are connected in series to a battery of e.m.f. V. If two capacitors are completely filled with dielectric material of constant k, then potential difference across the third capacitor will become

A potentiometer wire has length 4 m and resistance \(8\ \Omega\). The resistance that must be connected in series with the wire and the driving battery of e.m.f. 2 V, so as to get a potential gradient of 1 mV per cm on the wire is

The amount of work done in increasing voltage across the plates of capacitor from 5 V to 10 V is W. The work done in increasing it from 10 V to 20 V is

Three metallic spherical shells (not concentric) of radii R, 2R and 4R are given charges \(Q_{1}\), \(Q_{2}\) and \(Q_{3}\) respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges \(Q_{1}:Q_{2}:Q_{3}\), is

A resistance is to be measured using a meter bridge; the student chooses the standard resistance R to be \(100\ \Omega\). The student finds the null point at \(l_{1}=16\) cm. To get the null point near the middle of the wire, the value of R will be

Two identical straight wires are stretched so as to produce 8 beats per second when vibrating simultaneously with tensions \(T_{1}\) and \(T_{2}\) respectively. On changing the tensions, the beat frequency remains unchanged. This will happen when \((T_{1}>T_{2})\)

If the length of seconds pendulum on the surface of the earth is 1 m. The length of the seconds pendulum on the surface of the planet is \(\left\{g_{planet}=\frac{7}{2}g_{earth}\right\}\) {periodic time of the seconds pendulum is same on both planets}

A wave is represented by the equation \(y=0.2\,\sin 4\pi \left[\frac{t}{0.08}+\frac{x}{0.8}+\frac{1}{12}\right]\) in SI units.
The expression represents a wave traveling in the

The length of a sonometer wire AB is 176 cm. Where should the two bridges be placed from end A to divide the wire into three segments whose fundamental frequencies are in the ratio \(1:2:3\)?

The density of oxygen is 16 times that of hydrogen. The ratio of the velocity of sound in oxygen to that in hydrogen is

Two particles A and B execute S.H.M.s of periods T and \(\frac{5T}{2}\). If they start from the mean position, then the phase difference between them when the particle A completes two oscillations will be (in radian)

A body is suspended from the two light springs separately. The periods of vertical oscillations are T and 3T respectively. The same body is suspended from two springs connected first in parallel and then in series. The periods of oscillation in both cases, respectively, are

The rectangular surface area \((12\ \text{cm}\times 6\ \text{cm})\) of the black body, at a temperature \(127^{\circ }\text{C}\), emits heat energy at the rate of Q units per second. If the length and breadth of the surface area are each reduced to half of its initial value and the temperature is increased to \(327^{\circ }\text{C}\), then the emission of heat energy will be

A mono-atomic ideal gas, initially at temperature \(T_{1}\) is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature \(T_{2}\) by releasing the piston suddenly. \(L_{1}\) and \(L_{2}\) are the lengths of gas columns before and after the expansion, respectively. The value of \(\frac{T_{1}}{T_{2}}\) is \(\left[\gamma =\frac{5}{3}\right]\)

A gas for which \(\gamma\) is \(3/2\) is heated at constant pressure. The percentage of heat supplied for external work is nearly

There are two vessels A and B with rigid walls containing ideal gases. The pressure, temperature and volume are \(P_{A}\), \(T_{A}\) and V in the vessel A and \(P_{B}\), \(T_{B}\) and V in vessel B. The vessels are now connected through a small tube. In equilibrium, pressure is P and temperature is T, then \(\frac{P}{T}\) is {number of moles of gas in vessel A \(=\) number of moles of gas in vessel B}

A metal sphere cools from \(80^{\circ }\text{C}\) to \(60^{\circ }\text{C}\) in 10 minute. The time taken (in minute) by it to cool from \(60^{\circ }\text{C}\) to \(40^{\circ }\text{C}\) if the room temperature is \(30^{\circ }\text{C}\), is

Three spheres P, Q and R, having radii of 2 m, 3 m and 4 m respectively, are coated with lamp-black on their outer surfaces. The wavelengths corresponding to maximum intensity are 200 nm, 300 nm and 400 nm respectively. If the powers radiated by them are \(P_{P}\), \(P_{Q}\) and \(P_{R}\) respectively, then

An ice cube floats in water. The percentage of volume of ice cube outside the water is [density of water \(=1\) g/cc, density of ice \(=0.9\) g/cc]

A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of the radius 'R' and volume V. If T is the surface tension of the liquid, then the energy released in this process is

For uniform acceleration in linear motion which of the following is NOT CORRECT?

A flywheel used to prepare earthenware pots is set into rotation at 50 rpm. It is in the form of a disc of mass 5 kg and radius 0.2 m. A lump of clay (to be taken equivalent to a particle) of mass 0.8 kg falls on it and adheres to it at a certain distance 'x' from the centre. The value of 'x' if the wheel now rotates at 40 rpm, is

Consider the following forces-(a) Force of friction, (b) Collision forces, (c) Normal reaction generated by the surface and (d) Tension in strings.
Which of these are electromagnetic forces?