1: If energy of photon is , it is equivalent to mass m = · · ·
a. $\frac{E}{c^2}$
b. $\frac{2E}{c^2}$
c. $\frac{h\nu}{c}$
d. All of these
2: Black body can be made by a · · · within a solid body
a. Cavity
b. Hollow cavity
c. Material
d. Cylinder
3: The magnitude of plank’s constant is · · ·
a. $6.625\times{10}^{-34}Js$
b. $6.625\times{10}^{-31}Js$
c. $6.625\times{10}^{-19}Js$
d. $6.625\times{10}^{-27}Js$
4: In photoelectric effect, the maximum kinetic energy is zero if · · ·
a. $h\nu\ \le\ \phi$
b. $h\nu\ \geq\ \phi$
c. $h\nu\ \ll\ \phi$
d. $h\nu\ \gg\ \phi$
5: The maximum speed of electrons emitted by incident light on metal surface depends only on · · · of incident light
a. Intensity
b. Frequency
c. Energy
d. All of these
6: A · · · can be used in burglar alarm and opening the door automatically
a. Cavity
b. Line spectrum
c. Photocell
d. None of these
7: At low temperature, the body generally emits the radiations of · · · wavelength
a. Short
b. Long
c. a and b
d. None of these
8: The radiations emitted by human body lies in.
a. Ultraviolet
b. Gamma
c. Infrared
d. All of these
9: In a photocell, cesium coated oxide silver emits electron for
a. Ultraviolet light
b. Gamma light
c. Infrared light
d. All of these
10: · · · has strongest photons
a. Alpha rays
b. Beta rays
c. Gamma rays
d. All of these
11: If α-particle and deuteron move with velocity ![]()
and , the ratio of their de Broglie
wavelengths will be · · ·
a. $1:\sqrt2$
b. 1:1
c. 2∶1
d. $\sqrt2:\ 1$
12: What is the velocity of a particle of mass m and de-Broglie wavelength
a. $h/m\lambda$
b. $2h/m\lambda$
c. $h\lambda/m$
d. $\left(\frac{2hc}{m\lambda}\right)^\frac{1}{2}$
13: The Davisson-Germer experiment demonstrated the
a. particle nature of electron
b. wave nature of electron
c. wave nature of photon
d. particle nature of photon
14: Energy of α particles having de Broglie wavelength · · ·
a. $1280\ MeV$
b. $1200\ eV$
c. $1280\ eV$
d. $1200\ GeV$
15: Uncertainty principle is applicable to
a. microscopic particles
b. Macroscopic particles
c. Gases
d. None
16: A proton, a neutron, an electron and an α-particle have same energy. Then their de Broglie wavelengths compare as
a. $\lambda_p\ =\ \lambda_n\ >\ \lambda_e\ >\ \lambda_\alpha$
b. $\lambda_\alpha\ <\ \lambda_p\ =\ \lambda_n\ >\ \lambda_e$
c. $\lambda_e\ <\ \lambda_p\ =\ \lambda_n\ >\ \lambda_\alpha$
d. $\lambda_e\ =\ \lambda_p\ =\ \lambda_n\ =\ \lambda_\alpha$
17: For a given kinetic energy, which of the following has smallest de Broglie wavelength?
a. Electron
b. Proton
c. Deuteron
d. α particles
18: A Proton and an α-particle have the same de Broglie wavelength. What is same for both of them?
a. Mass
b. Momentum
c. Frequency
d. Energy
19: The phenomenon of photoelectric emission was discovered in 1887 by
a. Heinrich Hertz
b. Albert Einstein
c. Wilhelm Hallwachs
d. Philipp Lenard
20: Which of the following shows particle nature of light?
a. Refraction
b. Interference
c. Photoelectric effect
d. Polarization
21: In our normal life, we deal with big objects, whose velocity are small in comparison with
a. Velocity of light
b. Velocity of earth
c. Velocity of moon
d. None of these
22: Schrodinger formulation of quantum mechanics, a complex variable quantity ψ (x,y,z)called the …… was introduce to represent the wave associated with a particle in motion
a. Position vector
b. Operator
c. Wave function
d. All of these
23: In quantum mechanics corresponding to every observable, there exists
a. An equation
b. An operator
c. A wave function
d. None of these
24: The potential energy operator is
a. $\hat{V}\ (x)$
b. $i\hbar\frac{\partial}{\partial x}$
c. $\hat{x}$
d. None of these
25: X- component momentum operator is
a. $\hat{V}\ (x)$
b. $i\hbar\frac{\partial}{\partial x}$
c. $\hat{x}$
d. None of these
26: Which of the following statement is false for an electron
a. It is a quantum particle, behaving in some experiments like classical particle, and in some experiment like a classical wave
b. It carries momentum in its motion
c. It carries energy in its motion
d. It has rest energy is zero
27: A beam of quantum particles with kinetic energy 2eV is reflected from potential barrier of small width and original height 3eV . How does the function of particles that are reflected change as the barrier height is reduced to 2.01 eV.
a. It increases
b. It decreases
c. Stays constant
d. Can’t be answered
28: Suppose a tunneling current in an electronic device goes through a potential energy barrier. The tunneling is small because the width of barrier is large and barrier is high. To increases the current most effectively, what should you do
a. Reduce the height of barrier
b. Reduce the width of barrier
c. Either a or b
d. None
29: Quantum mechanics is based on certain postulates, which are sufficient to describe
a. n particle
b. Isolated
c. Closed
d. Single particle
30: The penetration of classically impenetrable barriers by electrons is called
a. Step potential
b. Schrodinger equation
c. Barrier tunneling
d. None
31: In He-Ne laser the lasing action is produced by
a. Ne only
b. He-Ne both
c. Electrons of He
d. Electrons of Ne
32: Excited atoms return to their ground state in
a. ${10}^{-10}\ s$
b. ${10}^{-9}\ s$
c. ${10}^{-8}\ s$
d. ${10}^{-6}\ s$
33: The radiations emitted form hydrogen filled discharge tube show
a. Band spectrum
b. Line spectrum
c. Continuous spectrum
d. Absorption spectrum
34: The meta-stable state for an atom in laser light is
a. ${10}^{-4}\ sec$
b. ${10}^{-5}\ sec$
c. ${10}^{-3}\ sec$
d. ${10}^{-8}\ sec$
35: In hydrogen spectrum which one of the following series lies in the ultraviolet region?
a. Balmer series
b. Pfund series
c. Bracket series
d. Lymann series
36: Hydrogen atom does not emit X- Rays because
a. Its energy levels are too close to each other
b. Its energy levels are too far apart
c. It is too small in size
d. It has a single electron
37: Energy range of X-ray in
a. $10\ eV\ to\ 100\ eV$
b. $100\ eV\ to\ {10}^4\ eV$
c. ∞
d. Zero
38: X-ray are · · ·
a. of unknown nature
b. high energy electrons
c. high energy photons
d. radio isotopes
39: In laser production the state in which more atoms are in the upper state than in the lower one is called
a. Metal stable state
b. Inverted population
c. Normal state
d. All the above
40: X-rays are similar in nature to
a. Cathode rays
b. Positive rays
c. Gamma-rays
d. Beta rays
41: MRI stands for
a. Metallic radiations integrated
b. Metallic resistance imaging
c. Magnetic resonance imaging
d. None of these
42: The proton mass is · · · time larger than electron mass
a. 989
b. 1836
c. 2598
d. 2992
43: SI unit of absorbed dose is
a. Black
b. Gray
c. Ohms
d. RBE
44: Isotopes have same
a. Protons
b. Mass
c. Neutron
d. All of these
45: According to which one of following law the density of atom is uniform
a. J.J. Thomson model
b. Rutherford’s model
c. Bohr’s model
d. All of the above laws contradict the statement
46: Which one of the following radiations possesses maximum penetrating power
a. $X-rays$
b. $\beta-rays$
c. $\gamma-rays$
d. All have the equal penetrating power
47: The bombardment of nitrogen with alpha particles will produce
a. Neutron
b. Proton
c. Electron
d. Positron
48: Radioactive decay obeys which one of the following laws
a. N=Nοe-λt
b. N=Nοeλt
c. N=Nοe-λt/2
d. Nο= N(1+eλt)
49: The path of alpha particle is
a. Rectilinear
b. Zig-zag or erratic
c. Curved
d. Elliptical
50: The charge on beta particle is
a. 1
b. −1
c. +2
d. −2
51: In semiconductor like silicon, the unit cell is
a. Simple cube
b. face centered cube
c. body centered cube
d. hexagonal
52: A doped semiconductor has impurity level below the conduction band. The type of material is
a. n-type
b. p-type
c. intrinsic
d. p or n type
53: Electronic distribution of Si atom is
a. 2, 10, 2
b. 2, 7, 5
c. 2, 4, 8
d. 2, 8, 4
54: Semiconductor material has
a. ionic bonding
b. covalent bonding
c. Van der Waal
d. Metallic bonding
55: Electric conduction is a semiconductor takes place due to
a. drift
b. diffusion
c. a and b
d. none of above
56: When electron leaves the n-material to fill holes in p-materials, the process is called
a. doping
b. mixing
c. diffusion
d. depletion
57: A reverse biased ideal diode look like an · · · resistance
a. infinite
b. finite
c. a and b
d. none of these
58: All normal atoms are electrically
a. positively charged
b. negatively charged
c. neutral
d. none of these
59: An ideal diode conducts in forwards direction with · · · Resistance
a. infinite
b. finite
c. zero
d. none of these
60: Free electron moves in · · · band whereas holes move in · · · band
a. conduction, valence
b. valence, conduction
c. filled, empty
d. none of these
