List of top Physics Questions asked in MHT CET

‘n’ number of waves are produced on a string in 0.5 second. Now the tension in a string is doubled (keeping radius constant). The number of waves produced in 0.5 second for the same harmonic will be

The initial pressure and volume of a gas is \( P \) and \( V \) respectively. First, by isothermal process, gas is expanded to volume \( 9V \), and then by adiabatic process its volume is compressed to \( V \). Then its final pressure is (Ratio of specific heat at constant pressure to constant volume \( \gamma = \frac{3}{2} \))

An electron in a stationary Bohr orbit of hydrogen atom jumps from 4th energy level to the ground state. The velocity that the photon acquired as a result of electron transition will be (h = Planck's constant, R = Rydberg's constant, m = mass of photon)

The upward force of 10\(^5\) dyne due to surface tension is balanced by the force due to the weight of the water column and \( h \) is the height of water in the capillary. The inner circumference of the capillary is (Surface tension of water = \( 7 \times 10^{-2} \) N/m)

In Boolean algebra the output \( C \) and the inputs \( A \) and \( B \) are related as \( C = \overline{A \cdot B} \). The logic gate corresponding to this equation is

When Young's double slit experiment is performed in liquid, 8\(^\text{th}\) bright band is found to lie where 5\(^\text{th}\) dark band lies in air. Refractive index of liquid is

A stretched string under tension fixed at both ends vibrates in the 4th harmonic. The equation of the stationary wave is \( Y = 3 \sin(200\pi t) \cos(0.4x) \), where \( x \) and \( y \) are in cm and \( t \) in seconds. The length of the vibrating string is

The resonance tube is filled with a liquid of density higher than that of water, then the resonating frequency

The range of the voltmeter is \( V \) when \( 50 \, \Omega \) resistance is connected in series. Its range gets doubled when \( 500 \, \Omega \) resistance is connected in series. The resistance of the voltmeter is

If \( f \) is the number of degrees of freedom of a molecule of a gas and ratio of molar specific heats of a gas, \( \gamma = 1 + \frac{2}{f} \) where \( \gamma = \frac{C_p}{C_v} \). The ratio of \( \gamma \) for monoatomic gas to \( \gamma \) for (rigid) diatomic gas is

In potentiometer experiment, for a given current, the balancing length for a cell is obtained at \( L \) cm. If the current through potentiometer wire is decreased, then the balancing length will

A capacitor \( C_1 = 4 \, \mu F \) is connected in series with another capacitor \( C_2 = 1 \, \mu F \). The combination is connected across a d.c. source of 200 V. The ratio of potential across \( C_2 \) to that across \( C_1 \) is

In non-uniform circular motion, the ratio of tangential acceleration to radial acceleration is \( (r = \) radius of circle, \( V = \) speed and \( \alpha = \) angular acceleration)

When light of wavelength \( \lambda \) is incident on a photosensitive surface, the stopping potential is \( V \). When light of wavelength \( 3\lambda \) is incident on the same surface, the stopping potential is \( \frac{V}{6} \). Threshold wavelength for the surface is

A wire of length \( L \), mass \( M \), density \( \rho \), radius \( R \) is stretched by a certain load. If \( r \) and \( \ell \) are the changes in radius and length respectively, then Poisson's ratio is

Find the intensity of magnetization of a magnet with moment \( 4 \, \text{Am}^2 \) which weighs 50 grams. (Density of the material of a magnet = 5000 kg/m\(^3\))

In hydrogen atom, the product of the angular momentum and the linear momentum of the electron is proportional to \( (n = \) principal quantum number)

In a parallelogram shown below, \( a^2 + b^2 = ? \)

Two unknown resistances are connected in two gaps of a meter bridge. The null point is obtained at 40 cm from the left end. A 30 \(\Omega\) resistance is connected in series with the smaller of the two resistances, the null point shifts by 20 cm to the right end. The value of the smaller resistance is

A transistor is used as a common emitter amplifier with a load resistance of 2 k\(\Omega\). The input resistance is 150 \(\Omega\). Base current is changed by 20 \(\mu A\), which results in a change in collector current by 1.5 mA. The amplified voltage gain of the amplifier is

Two wires of the same length and material are used to form a square loop and a circular loop respectively. If the same current is passed through both loops, then the ratio of the magnetic moment of the square loop to that of the circular loop is

In photoelectric emission, the intensity of incident light is reduced then stopping potential

Earth is assumed to be a sphere of radius \( R \) and uniform density. The variation of acceleration due to gravity (g) according to the depth and the height (h) from the Earth's surface is shown correctly by the graph

An ammeter is obtained by shunting an \( n \, \Omega \) galvanometer with \( n \, \Omega \) resistance. The additional shunt required to be connected across it to double the range is

Capacity of a parallel plate air condenser is 2 μF and voltage between the plates is changing at the rate of 3 V/s. The displacement current in the capacitor is