KMU CAT 5 YEARS PAST PAPERS
5 Years Past Papers
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
10 cm
30 cm
40 cm
120 cm
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Explanation
We are given:
A 30 cm long string One end is clamped (fixed), and the other i s free to move transversely It is vibrating in its s econd harmonic
We are to find the wavelength of the constituent traveling waves
The allowed standing wave lengths are: L = ( n −1/ 2 ) λ /2 , for n = 1 , 2 , 3 , …
So:
1st harmonic (n = 1) :
L = λ /4 ⇒ λ = 4 L = 120 cm
2nd harmonic (n = 2) :
L = 3 λ/4 ⇒ λ = 4 L/3 = 4 × 30 /3 = 40 cm
They will involve the oscillation of the atoms
They can all be polarized
They can travel through a vacuum
Both (a)&(c) are correct
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Explanation
Transverse waves involve oscillations perpendicular to the direction of travel and can be polarized, while they do not necessarily require a medium to travel (e.g., light waves).
Wavelength
Frequency
Speed
Intensity
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Explanation
When a sound wave moves from one medium to another, the quantity that remains the same is its frequency.
The frequency of a sound wave is determined by the source of the sound and doesn't change when it enters a different medium.
However, the wavelength and speed of the wave can change depending on the properties of the new medium.
درج ذیل میں سے کون سی قسم کی قوت کام نہیں کرتی؟
Elastic force
Frictional force
Gravitational force
Centripetal force
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Explanation
A centripetal force always acts perpendicular to the direction of an object's motion.
Meaning it doesn't contribute to the object's speed or change in kinetic energy, which is the definition of work.
Negative
Positive
Zero
Maximum and positive
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Explanation
When a body moves against the force of friction on a horizontal plane, the work done by the body is negative.
This is because work is defined as the dot product of force and displacement,
And when moving against friction, the force of friction acts in the opposite direction to the displacement of the body,
Resulting in an angle of 180 degrees between them.
λ
λ/2
λ/4
None of these
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Explanation
In a standing wave , a node is a point of no displacement and an antinode is a point of maximum displacement. The distance between a node and the nearest antinode is one-quarter of the wavelength ( λ/4 ).
Stationary waves or standing waves
Transverse waves
Longitudinal waves
None of these
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Explanation
When two waves of the same frequency and amplitude travel in opposite directions, they superpose to form standing waves.
These waves have nodes (no movement) and antinodes (maximum movement).
لمبی عمارت کے اوپری حصے سے پھینک دیا جانے والا ایک پتھر اس راستے پر چلتا ہے جو ______ ہے؟
Parabolic
Circular
Hyperbolic
None of these
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Explanation
A projectile follows a parabolic path under the influence of gravity and initial velocity. The motion combines horizontal uniform velocity and vertical acceleration due to gravity.
Is zero
Is constant but not zero
Increases uniformly with respect to time
Is proportional to the displacement of mass from a fixed point
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Explanation
According to Newton's second law ,
F=ma, a constant non-zero force results in uniform acceleration of the mass.
بولٹزمان کے مستقل کی قدر _____ ہے؟
1.38 × 10²³ J/K
1.38 × 10−²³ J/K
1.38 × 10²³ K/J
None of these
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Explanation
Boltzmann's constant (k_B) is a fundamental constant in physics .
The value of Boltzmann's constant is 1.38 × 10^(-23) J/K.
