Which of the following elements has an atomic number higher than that of chlorine?
a) Potassium
b) Sulphur
c) Aluminium
d) Phosphorus
Answer: a
Light quanta (photons) propagate as:
a) Photons
b) Protons
c) Neutrons
d) Electrons
Answer: a
Atoms are composed of:
a) Electrons and protons
b) Only electrons
c) Only protons
d) Electrons and nuclei
Answer: d
Which element has an atomic number greater than that of fluorine?
a) Sodium
b) Beryllium
c) Nitrogen
d) Boron
Answer: a
Which element has 17 protons, 18 neutrons, and 17 electrons?
a) Atomic mass 52
b) Atomic mass 35
c) Atomic mass 18
d) Atomic mass 17
Answer: b
How many neutrons are there in a uranium-238 atom?
a) 92
b) 238
c) 146
d) 330
Answer: c
Which of these elements has an atomic number greater than that of neon?
a) Oxygen
b) Magnesium
c) Nitrogen
d) Boron
Answer: b
Which element has a higher atomic number than potassium?
a) Sulphur
b) Chlorine
c) Calcium
d) Argon
Answer: c
Tritium is an isotope of:
a) Oxygen
b) Hydrogen
c) Phosphorus
d) Nitrogen
Answer: b
Photoelectric emission begins when the incident light has a minimum:
a) Wavelength
b) Velocity
c) Frequency
d) Acceleration
Answer: c
Which particle exhibits both wave and particle properties (dual nature)?
a) Neutron
b) Electron
c) Meson
d) Proton
Answer: b
The wavelength of X-rays is typically of the order of:
a) 1 mm
b) 1 cm
c) 1 micron
d) 1 angstrom
Answer: d
What is the electronic configuration of chromium (Z = 24)?
a) [Ne] 3s² 3p⁶ 3d⁴ 4s²
b) [Ne] 3s² 3p⁶ 3d⁵ 4s¹
c) [Ne] 3s² 3p⁶ 3d¹ 4s²
d) [Ne] 3s² 3p⁶ 4s² 4p⁴
Answer: b
Who discovered X-rays?
a) Wilhelm Roentgen
b) William Lee
c) X. Lollswick
d) J.J. Thomson
Answer: a
Cathode rays are a stream of:
a) Alpha particles
b) Electrons
c) Electromagnetic waves
d) Radiation
Answer: b
When cathode rays strike a heavy metal target, they produce:
a) Alpha rays
b) Alpha and beta rays
c) X-rays
d) Positive rays
Answer: c
The atomic model proposed by J.J. Thomson is called the:
a) Cream and cake model
b) Plum pudding model
c) Plum and cake model
d) Cream and pudding model
Answer: b
Which element has an atomic number higher than calcium?
a) Chlorine
b) Argon
c) Sulphur
d) Scandium
Answer: d
All isotopes of an element share the same:
a) Different atomic number and atomic mass
b) Different atomic number but same atomic mass
c) Same atomic number but different atomic mass
d) Same atomic number and atomic mass
Answer: c
Which element has an atomic number greater than silicon?
a) Aluminium
b) Sulphur
c) Magnesium
d) Sodium
Answer: b
Which element has an atomic number greater than that of zinc?
a) Copper
b) Iron
c) Chromium
d) Bromine
Answer: d
Propagation of light quanta is described by:
a) Photons
b) Protons
c) Neutrons
d) Electrons
Answer: a
Which element has a higher atomic number than iodine?
a) Silver
b) Bromine
c) Platinum
d) Zinc
Answer: c
Match the atomic models with their characteristics:
A. Thomson’s model – 3. Plum pudding model
B. Rutherford’s model – 2. Nuclear model
C. Bohr’s model – 4. Quantization of energy
D. De Broglie theory – 1. Dual nature of electron
Correct Match: d) 3 2 4 1
The atomic number of an atom represents the number of:
a) Electrons
b) Protons
c) Neutrons
d) Neutrons and protons
Answer: b