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Physics Chapter wise Weightage Class 12 HSC. We covered all the Physics Chapter wise Weightage Class 12 HSC in this post for free so that you can practice well for the exam.
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Physics Chapter wise Weightage Class 12 HSC Mock test for Students
If the fundamental frequency of an open pipe (open at both ends) is n₁ and that of a pipe closed at one end but of the same length is n₂, the ratio n₁ : n₂ is
a) 1 : 2
b) 2 : 1
c) 4 : 1
d) 1 : 4
Option b – 2 : 1
An air column in a pipe closed at one end resonates with a tuning fork of frequency 264 Hz. If the speed of sound is 330 m/s, the required length of the air column is
a) 31.25 cm
b) 93.75 cm
c) 62.50 cm
d) 125.75 cm
Option a – 31.25 cm
Two open organ pipes of lengths 50 cm and 50.5 cm produce 0.3 beats per second. The velocity of sound in air is
a) 3030 m/s
b) 30.30 m/s
c) 303 m/s
d) 3.03 m/s
Option b – 30.30 m/s
When an open organ pipe vibrates in its third harmonic, the number of nodes formed is
a) 1
b) 2
c) 3
d) 4
Option c – 3
For a pipe closed at one end, the frequency of the pth overtone (where n is the fundamental frequency) is given by
a) (p + 1)n
b) (2p + 1)n
c) (2p − 1)n
d) (p − 1)n
Option b – (2p + 1)n
What happens to the frequency of sound produced by an organ pipe when the temperature of air increases?
a) It increases
b) It decreases
c) It remains unchanged
d) It changes irregularly
Option a – It increases
The fundamental frequency of a closed organ pipe is 50 Hz. The frequency of its third overtone is
a) 200 Hz
b) 150 Hz
c) 250 Hz
d) 350 Hz
Option d – 350 Hz
A pipe open at both ends can produce frequencies that are
a) only even multiples of the fundamental
b) only odd multiples of the fundamental
c) all integral multiples of the fundamental
d) fractional multiples of the fundamental
Option c – all integral multiples of the fundamental
An open pipe of length 33 cm resonates at a frequency of 1000 Hz. This corresponds to the pipe’s
a) first harmonic
b) second harmonic
c) fourth harmonic
d) fundamental frequency
Option b – second harmonic
If n₁ is the fundamental frequency of a pipe open at both ends and n₂ is the fundamental frequency of a pipe open at one end only, both having the same length, then
a) n₁ = 2n₂
b) n₁ = n₂
c) 2n₁ = n₂
d) 3n₁ = 4n₂
Option a – n₁ = 2n₂
An open pipe emits its fundamental note. If one end is suddenly closed and it again produces a fundamental note, the new frequency will be
a) double
b) half
c) the same
d) one-fourth
Option b – half
For a pipe open at both ends, the frequency of the pth overtone (where n is the fundamental frequency) is
a) (p + 1)n
b) (2p + 1)n
c) (2p − 1)n
d) (p − 1)n
Option a – (p + 1)n
If an open pipe of length l vibrates in its fundamental mode, the pressure variation is maximum at the
a) ends of the pipe
b) centre of the pipe
c) points one-fourth of the length from each end
d) points one-third of the length from each end
Option b – centre of the pipe
We covered all the Physics chapter wise weightage Class 12 HSC above in this post for free so that you can practice well for the exam.
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