Available Answers

1. 1.

   Choose the correct option.

   1. An example of a non-standard unit of length is
      1. millimeter
      2. cubit
      3. kilometer
      4. metre
   2. The SI system of units is a standard system of units used in
      1. one country
      2. one state
      3. in all countries
      4. a town
   3. 2 km equals
      1. 200 m
      2. 2000 cm
      3. 2000 m
      4. 2000 mm
   4. Anil and Sudha are travelling in a car. Anil is said to be in motion with respect to
      1. Sudha
      2. the road
      3. the car seat
      4. the car door
   5. Which of the following are in rotational motion?
      1. A train moving on straight rails
      2. An airplane flying in the sky
      3. The hands of a working clock
      4. A child going down a slide
   S A M P L E

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   Answer:

   S A M P L E

   1. (b) cubit
   2. (c) in all countries
   3. (c) 2000 m
   4. (b) the road
   5. (c) The h
2. 2.

   Write T for the true statement and F for the false one. Correct the false statement(s).

   1. 1 km = 1000 mm
   2. Estimation is a very accurate method of measurement.
   3. An object is said to be in motion only if its distance from another object increases.
   4. Birds gliding in the sky are in periodic motion.
   S A M P L E

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   Answer:

   S A M P L E

   1. F 1 km = 1000 m
   2. F Estimation is an approximate method of meas
   3. ...
   4. F Birds gliding in the sky are in non-periodi...
3. 3.

   Write one word for the following.

   1. A unit that does not vary from place to place or with time.
   2. The distance between the tip of the middle finger and the elbow.
   3. The name given to the standard unit that contains 1000 m
   4. The type of motion that repeats itself after equal intervals of time
   S A M P L E

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   Answer:

   S A M P L E

   1. Standard unit
   2. Cubit
   3. Kilometre
   4. Periodic motion
4. 4.

   What is measurement?

5. 5.

   What is a unit?

6. 6.

   Name any two units of length.