CUET (UG) entrance exam Question Bank Solutions for Physics

Young's modulus for aluminium is 7 × 10¹⁰ Pa. The force needed to stretch an aluminium wire of diameter 2 mm and length 800 mm by 1 mm is ______.

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. lt can detect a signal of wavelength ______.

X-rays, gamma rays and microwaves travelling in a vacuum have ______.

A bat moving at 10 ms⁻¹ towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms⁻¹)

For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:

Which of the following is a tool used for separating the different color wavelengths from each other?

Light of wavelength `3500A` is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons?

In an inelastic collision, which of the following does not remain conserved?

Radiations of two photon's energy, twice and ten times the work function of metal are incident on the metal surface successively. The ratio of maximum velocities of photoelectrons emitted in two cases is:

According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal Vs the frequency of the incident radiation gives as straight the whose slope:

A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:

A 200 W sodium street lamp emits yellow light of wavelength 0.6 µm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:

Dimensions of ‘resistance’ are same as (where h is Planck's constant and e is charge):

An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λ_min is the smallest possible wavelength of X-ray in the spectrum, the variation of log λ_min with log V is correctly represented in:

The fundamental frequency of an open organ pipe is 300 Hz. The first overtone of this pipe has same frequency as first overtone of a closed organ pipe. If speed of sound is 330 m/s, then the length of closed organ pipe is:

A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is

A current of 2amp flowing through a conductor produced 80 joule of heat in 10 sec. The resistance of the conductor is:-

The heat produced by a 100 w heater in 2 minute is equal to

A bar magnet is dropped through a copper ring acceleration of magnet is

Energy dissipate in LCR circuit in