Modern Physics MCQ for NEET. We covered all the Modern Physics MCQ for NEET in this post for free so that you can practice well for the exam.
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MCQ on Physics for NEET Students
A photon is a/an
(a) quantum of light
(b) quantum of matter
(c) positively charged particle
(d) an instrument for measuring light intensity
Option a – quantum of light
Of the following properties, the photon does not possess
(a) rest mass
(b) momentum
(c) energy
(d) frequency
Option a – rest mass
A photon will have less energy if its
(a) amplitude is higher
(b) frequency is higher
(c) wavelength is longer
(d) wavelength is shorter
Option c – wavelength is longer
A photoelectric cell converts
(a) light energy into heat energy
(b) light energy to sound energy
(c) light energy into electric energy
(d) electric energy into light energy
Light of a particular frequency v is incident on a metal surface. When the intensity of incident radiation is increased, the photoelectric current
(a) decreases
(b) increases
(c) remains unchanged
(d) sometimes increases and sometimes decreases
Option b – increases
The photoelectric effect is based on the law of conservation of
(a) momentum
(b) energy
(c) angular momentum
(d) mass
Option b – energy
As the intensity of incident light increases
(a) photoelectric current increases
(b) K.E. of emitted photoelectrons increases
(c) photoelectric current decreases
(d) K.E. of emitted photoelectrons decreases
Option a – photoelectric current increases
The photoelectrons emitted from a metal surface are such that their velocity
(a) is zero for all
(b) is the same for all
(c) lies between zero and infinity
(d) lies between zero and a finite maximum
Option d – lies between zero and a finite maximum
In which of the following, the emission of electrons does not take place?
(a) Thermionic emission
(b) X-rays emission
(c) Photoelectric emission
(d) Secondary emission
Option b – X-rays emission
According to Rutherford’s atomic model, the electrons inside the atom are
(a) stationary
(b) not stationary
(c) centralized
(d) None of these
Option b – not stationary
According to classical theory, the circular path of an electron in the Rutherford atom is
(a) spiral
(b) circular
(c) parabolic
(d) straight line
Option a – spiral
Electrons in the atom are held to the nucleus by
(a) coulomb’s force
(b) nuclear force
(c) Vander Waal’s force
(d) gravitational force
Option a – coulomb’s force
Which of the following shows the particle nature of light?
(a) Refraction
(b) Interference
(c) Polarization
(d) Photoelectric effect
Option d – Photoelectric effect
A strong argument for the particle nature of cathode rays is that they
(a) produce fluorescence
(b) travel through a vacuum
(c) get deflected by electric and magnetic fields
(d) cast shadow
Option c – get deflected by electric and magnetic fields
In the case of electrons and photons having the same wavelength. What is the same for them?
(a) Energy
(b) Velocity
(c) Momentum
(d) Angular momentum
Option c – Momentum
The best metal to be used for photoemission is
(a) potassium
(b) sodium
(c) cesium
(d) lithium
Option c – cesium
The phenomenon best supports the theory that matter has a wave nature
(a) electron momentum
(b) electron diffraction
(c) photon momentum
(d) photon diffraction
Option b – electron diffraction
G..P. Thomson experimentally confirmed the existence of matter waves through the phenomena
(a) diffraction
(b) refraction
(c) polarization
(d) scattering
Option b – refraction
In the Davison-Germer experiment, an electron beam is an incident on a crystal. The reflected beam consists of
(a) photons
(b) protons
(c) x-rays
(d) electrons
Option d – electrons
The specific charge for cathode rays is
(a) constant
(b) variable
(c) dependent upon the material of the cathode
(d) dependent upon the nature of the gas in the discharge tube
Option a – constant
Cathode rays are made to pass between the poles of a magnet perpendicular to the axis, the effect of the magnetic field is
(a) to increase the velocity of rays
(b) to deflect them toward the north pole
(c) to deflect them toward the south pole
(d) to deflect them upwards above the plane of the paper
Option d – to deflect them upwards above the plane of the paper
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