Question

Fill in the blanks: 1. The S.I unit of speed is ___________________________ 2. The resting position of a bob of pendulum is called _______________________position. 3. When a body does not change its position with respect to its surrounding it is said to be at_____________________________________________ 4. Speed of a motor vehicle is measured by an instrument called______________________ 5. Distance travelled by a vehicle is measured by an instrument called__________________ 6. Time taken by a pendulum to complete one oscillation is called_____________________ 7. The metallic ball used in the pendulum is called_________________________________ 8. a substance whose crystals can vibrate very fast and a very precise rate is called--------------------------------- 9. An instrument showing the time by the shadow of a pointer cast by the sun on to a graduated plate is called________________________

Answer 1

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1. The S.I unit of speed is metre/sec.
2. The resting position of a bob of pendulum is called mean position.
3. When a body does not change its position with respect to its surrounding it is said to be at rest.
4. Speed of a motor vehicle is measured by an instrument called Speedometer.
5. Distance travelled by a vehicle is measured by an instrument called Odometer
6. Time taken by a pendulum to complete one oscillation is called Time period
7. The metallic ball used in the pendulum is called bob of the pendulum
8. A substance whose crystals can vibrate very fast and a very precise rate is called Quartz (a clock)
9. An instrument showing the time by the shadow of a pointer cast by the sun on to a graduated plate is called Sundial.

Explore more !!

The above questions are based on Kinematics(Motion) and Dynamics(Force & laws of motion). So, let's learn. more:

• Speed is a scalar quantity described by its magnitude only.
• When pendulum is at rest and in the Central position, it is called mean position and when it is n motion, it is called extreme position.
• Rest and Motion are relative terms. Nothing is at absolute rest in the entire universe, it depends upon the observer.
• Quartz and Sundial are used for determining the time, Quartz is very accurate and used in laboratories.
• Sundial is an ancient device which determines time wrt position of Sun.

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Answer 2

Answer:

1.m/s

2.equilibrium position

3.rest

4.speedometer

5.odometer

6.period

7.BOB

8.quartz

9.sundial

Explanation: