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Physics 914 MCQs [All-Courses]

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Physics is a core science subject that deals with the study of matter, energy, motion, force, heat, light, electricity, magnetism, and modern physics concepts. It plays a vital role in competitive exams such as PPSC, FPSC, NTS, OTS, KPPSC, BPSC, AJKPSC, CSS, and PMS, where questions test conceptual understanding, numerical problem-solving, and application of laws and formulas. 

All Topics  914

Which phenomena can be applied to estimate the velocity of star with respect to earth ___________________?
A Dopplers effect
B Interference of waves
C Beats phenomena
D All of these
Correct Answer: Dopplers effect
The speed of stationary waves in a stretched string are independent of___________________?
A Number of loops
B Tension in the string
C Point where string is plucked
D both A and C
Correct Answer: both A and C
The speed of sound in hydrogen is _____________ time than that in oxygen?
A Two times
B Three times
C Four time
D Six time
Correct Answer: Four time
Newton estimated the speed of sound _____________________?
A 281m/sec
B 333m/sec
C 340m/sec
D all of the above
Correct Answer: 281m/sec
Which one is the correct relation for fundamental frequency of open and closed pipe ?
A fopen = 2 fclosed
B fclosed = 2fopen
C fopen = fclosed
D fopen = 1 / f closed
Correct Answer: fopen = 2 fclosed
When the source of sound moves away form a stationary listener then ______________ occurs?
A an apparent increase in frequency
B an apparent decrease in frequency
C an apparent decrease in wavelength
D no apparent change in frequency
Correct Answer: an apparent decrease in frequency
Silence zone takes place due to____________________?
A constructive interference
B destructive interference
C beats
D resonance
Correct Answer: destructive interference
The number of beats produced per second is equal to____________________?
A the sum of the frequencies of two tuning forks
B the difference of the frequencies of two tuning forks
C the ratio of the frequencies of two tuning forks
D the frequency of either of the two tuning forks
Correct Answer: the difference of the frequencies of two tuning forks
Ultrasonic have__________________?
A frequency in the audible range
B frequency is greater than 20 kHz
C frequency lower than 20 Hz
D all of above
Correct Answer: frequency is greater than 20 kHz
The velocity of sound in air would become double than its velocity at 0°C at temperature ?
A 313°C
B 586°C
C 819°C
D 1172°C
Correct Answer: 819°C
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