List of top Physics Questions asked in MHT CET

A transverse wave is travelling on a string with velocity \( V \). The extension in the string is \( x \). If the string is extended by 50%, the speed of the wave along the string will be nearly (Hooke's law is obeyed)

Let the physical quantity be \( x = \frac{a^3b^2}{c} \). If the percentage error in the measurement of \( a \), \( b \), and \( c \) is 2%, 3%, and 4% respectively, then the percentage error in the measurement of \( x \) is:

A force \(F = (10 + 0.5x)\) N acts on a particle in the x-direction. The work done by the force in displacing the particle from \(x = 0\) to \(x = 2\) m is

One end of thick horizontal copper wire of length \(2L\) and radius \(2R\) is welded to the end of another thin horizontal copper wire of length \(L\) and radius \(R\). When they are stretched by applying the same force at the two ends, the ratio of the elongation in the thick wire to that in the thin wire is

A body performing simple harmonic motion has potential energy \(P_1\) at displacement \(x_1\). Its potential energy is \(P_2\) at displacement \(x_2\). The potential energy \(P\) at displacement \((x_1 + x_2)\) is

Find the dimensions of the quantity \( x \) in the equation \( T = 2\pi \left( \frac{ML^3}{3XY} \right)^{\frac{1}{2}} \), where \( T \) is the time period, \( M \) is mass, \( L \) is length, and \( Y \) is the Young’s modulus.

A wire has a length of 2 m and resistance of \(10\,\Omega\). It is connected in series with a resistance of \(990\,\Omega\) and a cell of e.m.f. 2 V. The potential gradient along the wire will be

The moduli of elasticity for a substance are Young’s modulus, Bulk modulus and Modulus of rigidity. All the three moduli of elasticity are possessed by

The percentage errors in measurements of mass and speed of a body are 2% and 3% respectively. What is the percentage error in kinetic energy of the body?

A flywheel of mass 2 kg has radius of gyration 0.5 m. If it makes 10 r.p.s., then its rotational kinetic energy will be

A radioactive nucleus emits \( \alpha \) particles and \( \beta \) particles in succession. The ratio of number of neutrons to that of protons is \( A = \) mass number, \( Z = \) atomic number

The variation of stopping potential for metals A, B, C and D with frequency of incident radiation is as shown in the figure. For which metal, stopping potential is higher for lower values of threshold frequency (\(\nu_0\))? [The frequency of incident radiation \(\nu\) is same.]

If two sources emit light waves of different amplitudes then in interference pattern

In communication system, what is used to extend the range of a communication?

The equation of vibration of a stretched string fixed at both ends and vibrating in 5th harmonic is \( Y = 3 \sin(0.4x) \cos(200\pi t) \), where \( x \) and \( Y \) are in cm and \( t \) in seconds. The length of the string is

The frequency of two tuning forks A and B are 1.5% more and 2.5% less than that of the tuning fork C. When A and B are sounded together, 12 beats are produced in 1 second. The frequency of tuning fork C is

A potentiometer wire of length 100 cm and resistance \(3\,\Omega\) is connected in series with resistance of \(8\,\Omega\) and an accumulator of 4 volt whose internal resistance is \(1\,\Omega\). A cell of e.m.f. \(E\) is balanced at 50 cm length of the wire. The e.m.f. of the cell is

The ground state energy of hydrogen atom is \(-13.6 \, \text{eV}\). The kinetic and potential energy of the electron in the second excited state is respectively

The digital signals are used for transmission in communication system. They are

A particle starting from rest moves along the circumference of a circle of radius \( r \) with angular acceleration \( \alpha \). The magnitude of the average velocity, in the time it completes the small angular displacement \( \theta \), is

A simple pendulum oscillates with an angular amplitude $\theta$. If the maximum tension in the string is twice the minimum tension, then $\theta$ is

The kinetic energy of a particle performing S.H.M. is $\dfrac{1{n}$ times its potential energy. If the amplitude of S.H.M. is $A$, then the displacement of the particle will be

When a resistance of \( 200\Omega \) is connected in series with a galvanometer of resistance \( G \), its range is \( V \). To triple its range, a resistance of \( 2000\Omega \) is connected in series. The value of \( G \) is

Let force \( F = A \sin(Ct) + B \cos(Dx) \) where \( x \) and \( t \) are displacement and time respectively. The dimensions of \( \frac{C}{D} \) are same as dimensions of

A long metal rod of length \(L\) completes the circuit as shown. The area of the circuit is perpendicular to magnetic field \(B\). Total resistance of the circuit is \(R\). The force needed to move the rod in the direction as shown with constant speed \(V\) is