KMU CAT PAST PAPERS AND SYLLABUS
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- 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.
- 1
- 2
- 4
- 6
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Explanation
In NaCl, each sodium ion (Na⁺) is surrounded by six chloride ions (Cl⁻) in a cubic close-packed structure.
Therefore, the coordination number of Na in NaCl is 6.
- Translational motion only
- Rotational motion only
- Vibrational motion only
- All of the above
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Explanation
In solids, particles mainly exhibit vibrational motion about their fixed positions.
They have limited translational and rotational motion compared to liquids and gases.
- Are not affected by temperature change
- May or may not be affected by pressure change
- May or may not be affected by temperature change
- Are not affected by pressure change
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Explanation
Homogeneous liquid equilibria can be affected by temperature changes,
It as the temperature can influence the equilibrium position.
Pressure changes may also affect equilibria but to a lesser extent than temperature changes.
- Order and molecularity both can be zero
- Order cannot be zero
- Molecularity can be zero
- Order can be in fraction while molecularity cannot be in fraction
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Explanation
The order of a reaction can be fractional, whereas molecularity (the number of molecules involved in the reaction)
It is always a whole number and cannot be fractional
- Potential energy
- Kinetic energy
- Chemical energy
- Lattice energy
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Explanation
The Born-Haber cycle is used to calculate the lattice energy of an ionic compound,
which is the energy required to form the ionic lattice from its gaseous ions.
- Mg(OH)₂
- Be(OH)₂
- Ca(OH)₂
- None of these
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Explanation
Be(OH)₂ is an amphoteric hydroxide, meaning it can act as both an acid and a base.
Mg(OH)₂ and Ca(OH)₂ are basic hydroxides.
- The efficiency of the working substance
- The ideal gas scale temperature
- The thermal conductivity of the working substance
- The thermal conductivity of the working substance
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Explanation
The efficiency of a Carnot engine is given by
Efficiency = 1 − 𝑄 rejected /𝑄 accepted
where 𝑄 accepted and 𝑄 rejected is the heat absorbed and rejected, respectively.
- Pressure
- Work done
- Internal energy
- Imaginary number
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Explanation
In an isothermal process, the temperature remains constant, so the internal energy of an ideal gas also remains constant.
- Radio waves
- Ultraviolet rays
- X-rays
- Ultrasonic waves
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Explanation
Polarization is a property of transverse waves, where the direction of vibration can be oriented in various directions.
Ultrasonic waves are longitudinal waves and cannot be polarized.