Available Answers

1. 1.

   Choose and write the correct answer (MCQs) :

   1. Speed is :
      1. distance x time
      2. distance/time
      3. (1/distance) x time
      4. none of these
   2. Which of these is not a unit of time ?
      1. second
      2. hour
      3. light year
      4. year
   3. An object that is moving is said to be in :
      1. oscillation
      2. motion
      3. vibration
      4. none of these
2. 2.

   Fill in the blanks :

   1. Speed is defined as the ratio of _______________ to the _______________ taken.
   2. The basic unit of time is _______________.
   3. The movement that repeats again and again is called _______________ motion.
   4. The time taken by a pendulum to complete _______________ oscillation is called its time period.
   5. Stop clock, digital clocks are used to measure _______________.
3. 3.

   Write T for true or F for false :

   1. The basic unit of time is second.
   2. Speed is a measure of how fast or slow is an object moves.
   3. Every object moves with a constant speed.
   4. The time period of a given pendulum is not constant.
   5. The speed of train is expressed in mh^-1.
4. 4.

   Match the column A with column B :

   A	B
   1. Speed	a. Brass bob
   2. Simple pendulum	b. Measure time
   3. Clock	c. Acceleration
   4. Stop clock	d. Speedometer

    

5. 5.

   Classify the following as motion along a straight line, oscillatory motion or circular motion.

   1. Motion of the horse pulling a cart on a straight road.
   2. Motion of child in a merry go round.
   3. Motion of the hammer of an electric bell.
   4. Motion of a revolving fan.
6. 6.

   Why do we need to measure speed?