NUMS Mdcat 2022 | Solved with Explanation | mosaicbro.com
NUMS Mdcat 2022 | Solved with Explanation
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Review Answers:
120
One kilowatt-hour is equal to:
Correct Answer:B
Explanation:
1 kWh = 3.6 × 10⁶ J = 3.6 MJ.
121
If the speed of a body is doubled, its kinetic energy becomes:
Correct Answer:D
Explanation:
KE = ½ mv² → If v doubles, KE becomes 4 times (KE' = ½ m(2v)² = 2mv²).
122
The minimum required velocity to put a satellite into the orbit is called:
Correct Answer:C
Explanation:
Critical velocity is the minimum speed needed for a stable orbit.
123
When an object experiences circular motion, the direction of centripetal acceleration is:
Correct Answer:A
Explanation:
Centripetal acceleration always points toward the center of the circular path.
124
The horizontal distance travelled by a wave during one complete cycle is called:
Correct Answer:B
Explanation:
Wavelength is the distance between two consecutive crests or troughs of a wave.
125
If the period of oscillation of a mass (M) suspended from a spring is 1s, then the period of 16M will be:
Correct Answer:D
Explanation:
The period (T) of a spring-mass system is proportional to the square root of the mass (T ∝ √m). If mass increases 16 times, the period increases by √16 = 4 times.
126
Loudness of the sound is directly related to:
Correct Answer:A
Explanation:
Loudness depends on the intensity (energy per unit area) of the sound wave.