1. What is meant by periodic motion?
A.
Motion that repeats itself after equal intervals of time
B.
Motion in a straight line only
C.
Motion with continuously increasing speed
D.
Motion that never repeats
Correct Answer:
Motion that repeats itself after equal intervals of time
Explanation:
Periodic motion is motion that repeats its state after equal intervals of time.
2. The time taken by a periodically moving object to complete one cycle is called its:
A.
Amplitude
B.
Frequency
C.
Time period
D.
Displacement
Correct Answer:
Time period
Explanation:
The time period is the time required for one complete repetition or cycle of periodic motion.
3. Which of the following is an example of periodic motion?
A.
The motion of a swinging pendulum
B.
A car moving on a straight road without stopping
C.
A stone falling from a height
D.
A person walking randomly
Correct Answer:
The motion of a swinging pendulum
Explanation:
A swinging pendulum repeats its motion after equal intervals of time, so it exhibits periodic motion.
4. The number of complete cycles made by a periodically moving object in one second is called:
A.
Time period
B.
Frequency
C.
Amplitude
D.
Phase
Correct Answer:
Frequency
Explanation:
Frequency is defined as the number of complete cycles or oscillations made per second.
5. What is the SI unit of frequency?
A.
Second
B.
Metre
C.
Hertz
D.
Radian
Correct Answer:
Hertz
Explanation:
Frequency is measured in hertz, where one hertz means one complete cycle per second.
6. If an object completes one cycle in 4 seconds, its time period is:
A.
0.25 s
B.
2 s
C.
4 s
D.
8 s
Correct Answer:
4 s
Explanation:
The time period is the time taken for one cycle. Since one cycle takes 4 seconds, the time period is 4 s.
7. A motion that repeats after every 2 seconds has a frequency of:
A.
0.5 Hz
B.
1 Hz
C.
2 Hz
D.
4 Hz
Correct Answer:
0.5 Hz
Explanation:
Frequency is the reciprocal of time period: f = 1/T = 1/2 = 0.5 Hz.
8. Which quantity describes the maximum displacement from the mean position in an oscillatory periodic motion?
A.
Frequency
B.
Time period
C.
Amplitude
D.
Wavelength
Correct Answer:
Amplitude
Explanation:
Amplitude is the maximum displacement of the object from its mean position during periodic motion.
9. The motion of the hands of a clock is periodic because it:
A.
Moves with increasing speed every minute
B.
Repeats its position after a fixed interval of time
C.
Moves only in a straight line
D.
Has no definite direction
Correct Answer:
Repeats its position after a fixed interval of time
Explanation:
The hands of a clock return to the same positions after fixed intervals, which makes their motion periodic.
10. If a vibrating object makes 10 complete oscillations in 5 seconds, its frequency is:
A.
0.5 Hz
B.
2 Hz
C.
5 Hz
D.
50 Hz
Correct Answer:
2 Hz
Explanation:
Frequency equals the number of oscillations divided by time: f = 10/5 = 2 Hz.
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