Compared to liquids and solids, gases are:
1.good conductors of electricity
2.best conductors of electricity
3.very poor conductors of electricity
4.good or bad conductors of electricity depending upon the nature of the gas
Posted Date:-2021-12-17 10:15:59
De-Broglie equation states the:
1.dual nature
2.particle nature
3.wave nature
4.None of the these
Posted Date:-2021-12-17 09:57:44
Evidence of the wave nature of light cannot be obtained from:
1.diffraction
2.interference
3.doppler effect
4.reflection
Posted Date:-2021-12-17 10:14:03
In photo electric emission, for alkali metals the threshold frequency lies in the:
1.visible region
2.ultraviolet region
3. infrared region
4.far end of the infrared region
Posted Date:-2021-12-17 10:07:09
In Thomson’s experiment number of parabola gives :
1.the no. of electrons present in element
2.the no. of proton present in element
3.the no. of neutrons present in element
4. the no. of isotopes of the element present
Posted Date:-2021-12-17 10:00:55
Kinetic energy of emitted electrons depends upon :
1. frequency
2.intensity
3.nature of atmosphere surrounding the electrons
4.None of the above
Posted Date:-2021-12-17 09:59:09
Millikan’s oil drop experiment makes use of:
1.Stokes’ law
2.Boyle’s law
3.Gas equation
4.Bernoulli’s theorem
Posted Date:-2021-12-17 10:05:28
Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:
1.Millikan
2.Planck
3.Faraday
4.Boyle
Posted Date:-2021-12-17 10:04:23
Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?
1.Energy
2.Time period
3.Frequency
4.Momentum
Posted Date:-2021-12-17 09:58:17
The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms-1, in terms of Planck’s constant h, is given by (in metre):
1.105 h
2.106 h
3.10-3 h
4.103 h
Posted Date:-2021-12-17 10:13:22
The different stages of discharge in a discharge tube can be explained on the basis of:
1. the wave nature of light
2. the dual nature of light
3. wave nature of electrons
4.the collision between the charged particles emitted from the cathode the atoms of the gas in the tube
Posted Date:-2021-12-17 10:16:46
The momentum of an electron that emits a wavelength of 2 Ã…. will be:
1.6.4 × 10-36 kgms-1
2.3.3 × 10-24 kgms-1
3.3.3 × 10-34 kgms-1
4.none of these
Posted Date:-2021-12-17 10:03:31
The ratio of specific charge of an alpha particle to the proton is:
1.1 : 2
2.2 : 1
3.4 : 1
4.1 : 4
Posted Date:-2021-12-17 10:00:06
The strength of photoelectric current depends upon :
1.angle of incident radiation
2.frequency of incident radiation
3.intensity of incident radiation
4.distance between anode and cathode
Posted Date:-2021-12-17 10:02:45
The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:
1.8 × 1014 Hz
2.8 × 1010 Hz
3.5 × 1010 Hz
4.4 × 1014 Hz
Posted Date:-2021-12-17 10:01:52
What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?
1.12.3 Ã…
2.1.23 Ã…
3.0.123 Ã…
4.None of the these
Posted Date:-2021-12-17 10:11:41
When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
1.no electrons are emitted
2.photons are emitted
3.electrons of higher energy are emitted
4.electrons of lower energy are emitted
Posted Date:-2021-12-17 10:12:26
which Characteristic of a target does the Mosley’s law relate the frequency of X-rays?
1.density
2.atomic number
3.atomic weight
4.interatomic space
Posted Date:-2021-12-17 10:14:58
Which of the following radiations cannot eject photo electrons?
1.ultraviolet
2.infrared
3.visible
4.X-rays
Posted Date:-2021-12-17 10:10:38
X-rays are:
1.deflected by an electric field
2.deflected by a magnetic field
3.deflected by both electric and magnetic fields
4.not deflected by electric and magnetic fields
Posted Date:-2021-12-17 10:06:19