Available Answers

1. 1.

   Think of some more cases where you need to measure. Write in the table given below. Some cases that need measurement

   1. Time
   2. Distance
   3. Length
   4. Mass

    

2. 2.

   Tick (√) the correct options:

   1. The standard unit of length is _______________.
      1. metre
      2. centimetre
      3. kilometre
      4. cubit
   2. The length of a curved line can be measured with a _______________.
      1. scale
      2. ruler
      3. thread
      4. compass
3. 3.

   Tick (√) the correct options:

   1. Which of the following is an example of circular motion?
      1. motion of the moon around the earth
      2. motion of the tip of the hand of a clock
      3. running of an athlete on a circular track
      4. all of these
   2. When an object changes its position with respect to a stationary object, it is said to be in/at _______________.
      1. rest
      2. motion
      3. both of these
      4. none of these
4. 4.

   Tick (√) the correct options:

   1. The motion of a pendulum is _______________.
      1. periodic
      2. circular
      3. rotatory
      4. rectilinear
   2. We can accurately measure the length of a table with a _______________.
      1. handspan
      2. cubit
      3. measuring tape
      4. pace
   3. Which type of motion is the motion of a child going down a slide?
      1. periodic
      2. translatory
      3. circular
      4. rotatory
   4. When an object moves along a straight line, its motion is called _______________ motion.
      1. rectilinear
      2. curvilinear
      3. circular
      4. rotatory
   5. Motion of a swing is an example of _______________ motion.
      1. periodic
      2. oscillatory
      3. circular
      4. rotatory
   6. Standard units of measurement are those that have a _______________ quantity.
      1. variable
      2. different
      3. fixed
      4. no
5. 5.

   Look at the figures given alongside and tick (√) the correct options:

    

   1. The correct position of the eye to get correct measurement of length in Fig. (a) is
      1. X
      2. Y
      3. Z
      4. none of these
   2. The correct measurement of the length of the card in Fig. (b) is
      1. 5.5 cm
      2. 5.6 cm
      3. 4.5 cm
      4. 4.6 cm
6. 6.

   Fill in the blanks:

   1. The standard unit of mass is _______________.
   2. We use a metre rod to measure _______________.
   3. An object is said to be at _______________, if its position does not change with time.
   4. The earth revolves around the Sun in a circular path. This is an example of _______________ motion.
   5. A car moving on a straight road is in _______________ motion.