Motion and Time Test - 1

Explanation:

Time taken to complete one vibration is called time-period. Time period is the reciprocal of frequency. It's S.I unit is 'second'.

Explanation:

Number of vibrations per second is called frequency. S.I. unit of frequency is Hertz (Hz).Frequency = 1 / time period. 

Explanation:

Odometer is a device, which is used to measure total distance travelled by the vehicle from initial position to final position. 

Explanation:

Pendulum of a given length always takes equal time to complete one oscillation. It is called as time period of the pendulum.The time period of a simple pendulum of a fixed length remains constant.

Explanation:

Stop watch is used to measure exact time during an event like race. It is mostly used to measure the time between two events. 

Explanation:

Most of the simple pendulum consist of a small metallic ball called a Bob hung on a string or a wire.The time period of the pendulum doesnot change with the change in size or weight of the Bob.

Explanation:

The rate of change in position of a body is called speed, that is the distance covered by a body in unit time.

Speed = distance / time .S.I unit of speed is meter per second.

Explanation:

Speed time graph is a straight line parallel to x-axis for uniform motion of the body. In uniform motion speed is constant so speed - time graph is a straight line parallel to time axis. 

Explanation:

S.I. unit of time is second. Time is the gap between two events.The other units being minute, hour, day ,year , century and millenium.

Explanation:

Atomic watch is most accurate watch. It is used for extremely accurate timekeeping.They use the vibrations of atoms to keep time.