KMU CAT PAST PAPER 21-08-2024
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0.01 g
0.02 g
0.03 g
0.04 g
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Explanation
The molar mass of CaCO₃ is approximately 100 g/mol.
The molar mass of calcium (Ca) in CaCO₃ is about 40 g/mol.
The proportion of calcium in CaCO₃ is 40/ 100 = 0.4
Therefore, in 0.1 g of CaCO₃, the amount of calcium is 0.1×0.4=0.04 g.
Lighter nuclei
Heavy nuclei
Intermediate nuclei
None of these
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Explanation
The binding energy per nucleon is highest for intermediate-sized nuclei (e.g., iron).
Both lighter and heavier nuclei have lower binding energies per nucleon compared to these intermediate nuclei.
Voltage amplifiers
Oscillators
Current amplifiers
Regeneration
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Explanation
Transistors primarily act as current amplifiers in a circuit.
They can increase the current flowing through a circuit, which can also be used for voltage amplification and switching.
1 field
2 fields
3 fields
4 fields
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Explanation
A moving charged particle is surrounded by both an electric field and a magnetic field.
The electric field is due to the charge itself, and the magnetic field is generated due to the particle's motion.
Second
Weber
Henry
Tesla
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Explanation
Ohm × Farad is equivalent to a second (s).
This is because the unit of capacitance ( Farad )
multiplied by resistance ( Ohm ) gives time (s),
which represents the time constant in RC circuits.
Its size decreases
Its size increases
No change
None of these
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Explanation
When a soap bubble is charged, the repulsive forces between like charges on the surface of the bubble cause the bubble to contract, decreasing its size.
Butane (C₄H₁₀)
Pentane (C₅H₁₂)
Hexane (C₆H₁₄)
Heptane (C₇H₁₄)
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Explanation
Among the listed liquids, heptane (C₇H₁₄) has the greatest molecular weight
Thus the strongest intermolecular forces, lead to the lowest vapor pressure at the same temperature
Dispersion forces
Dipole-dipole forces
Hydrogen bonding
Greater molar mass
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Explanation
Ammonia (NH₃) has a higher boiling point than phosphine (PH₃)
Ammonia exhibits hydrogen bonding, a stronger intermolecular force than the dipole-dipole forces in phosphine.
Pressure decreases
Temperature decreases
Pressure and temperature both decrease
None of these
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Explanation
When a gas expands suddenly (an adiabatic expansion), it does work on the surroundings without any heat exchange.
As a result, the internal energy of the gas decreases, leading to a decrease in temperature.
Aufbau principle
Hund's Law
Pauli exclusion principle
Heisenberg's uncertainty principle
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Explanation
The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers.
This principle helps to explain the arrangement of electrons in atoms.