CUET (UG) entrance exam Question Bank Solutions for Physics

Find the de-Broglie Wavelength for an electron moving at the speed of 5.0 × 10⁶ m/s. (mass of electron is 9.1 × 10^-31)

Number of ejected photo electrons increase with increase

For what k.e of neutron will the associated de-Broglie wavelength be 1.40 × 10^-10 m? mass of neutron= 1.675 × 10^-27 kg, h = 6.63 × 10^-34 J

A strong argument for the particle mature of cathode ray is to

An oil drop carrying a charge q has a mass m kg it is falling freely in air with terminal speed v. the electron field required to make the drop move upward with the same speed is

The ground state energy of a hydrogen atom is - 13.6 eV When its electron is in the first excited state, its excitation energy is

Energy needed to establish an alternating current I in a coil of self-inductance L is

An inductor may store energy in

What is the unit of self-inductance of a coil?

A coil of wire of a certain radius has 600 turns and a self-inductance is 108 mH. The self-inductance of a second similar coil of 500 turns will be:

A family uses 8 kW of power. Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW?

If a heater coil rated lkW, 220 V is connected in series with an electric bulb of 100 W, 220 V and are supplied 200V, power consumed by the bulb in this circuit is ______.

The average work done by a human heart while it beats once is 0.5 Joule. The power used by heart if it beats 72 times in a minute:

A radioactive sample is undergoing α decay. At any time t₁, its activity is A and another time t₂, the activity is `"A"/5`. What is the average life time for the sample?

A electric bulb is rate 220 V, 60 W. its electric cell resistance is nearly

The net mass energy of an electron is

A deuteron is bombarded on 80¹⁶ nuclear and an x - = particle is emitted. The product nucleus is

In which of the following decays the atomic number decrease

The velocity of a body of mass 2 kg as a function of time t is given by v(t) = 2t`hat"i" + "t"^2hat"j"`. The force acting on it, at time t = 2 s is given by ______.

A particle of mass 10 mg and having a charge of 50 mC is projected with a speed of 15 m/s into a uniform magnetic field of 125 mT. Assuming that the particle is projected with its velocity perpendicular to the magnetic field, the time after which the particle reaches its original position for the first time is ______.