1 which the following insturment doen not make oscillation movement ?
a)spring
b)pendulum
c)turning fork
d)wheel barrow
2 number of osillations in one second is known as
a)amplitude
b)wave length
c)frequency
d)period
3 frequency is the reciprocal of the
a)wave length
b)amplitude
c)period
d)speed
4 what is the period of spring that makes 20 oscillations at 5 seconds ?
a)0.5 second
b)4 second
c)0.25 second
d)none of the above

1)Wheel barrow does not make oscillation movement

2)Number of oscillations in one second is known as frequency.

3) Frequency is the reciprocal of wavelength.

4) The period of spring is 4 second.

Explanation:

1) Wheel barrow does not make oscillation movement  as they move as push and pull motion. The other instruments like spring, pendulum and turning fork will behave in oscillation movement.

2) Number of oscillations in one second is known as frequency. Since, frequency is the measure of repetition in a given time interval, it is found by calculating the number of oscillations in one second.

3) Frequency is the reciprocal of wavelength. The product of frequency and wavelength is defined as velocity. So frequency will be defined as the reciprocal of wavelength.

4) As it is making 20 oscillations in 5 seconds, then the time taken for single oscillation is considered as period of spring.

So the period of spring is 4 second.