Available Answers

1. 1.

   Choose the correct answer.

   1. The length of a body is measured by a −
      1. barometer 
      2. metre scale
      3. thermometer 
      4. beam balance 
   2. The SI unit of length is −
      1. centimetre 
      2. kilometre
      3. metre
      4. millimetre
   3. Which of the following is treated as the basic unit in physics?
      1. area
      2. length
      3. volume
      4. capacity 
   4. The SI unit of mass is −
      1. kilogram
      2. gram
      3. milligram
      4. quintal
   5. How many sq.cm are there in one sq.metre?
      1. 100
      2. 1000
      3. 10,000
      4. 1,00,000
   6. Normal temperature of a human body is −
      1. 98.6°C
      2. 37 K
      3. 96.6°F
      4. 37°C
   7. Number of seconds in a solar day is −
      1. 80,046
      2. 80,064
      3. 84,600
      4. 86,400
   8. The SI unit of time is −
      1. day
      2. hour
      3. minute
      4. second
2. 2.

   Fill in the blanks :

   1. The unit of mass in SI system is _____________________.
   2. The unit of length in SI system is _____________________.
   3. _________________________ is defined as the interval between two events.
   4. _________________________ thermometer is used to measure body temperature.
   5. One milligram is equal to ________________________ kilogram.
   6. 10 m 20 cm = _____________________ cm.
   7. One hour = ______________________ seconds.
   8. __________________________ watch is used to measure time in a car race.
   9. _________________________ quintals = one tonne.
3. 3.

   Write True (T) or False (F) against the following statements :

   1. Foot length is the standard unit for measuring length.
   2. The SI unit of mass is gram.
   3. There is a need for standard unit.
   4. Temperature is the degree of hotness or coldness of a body.
   5. Clinical thermometer is used to measure temperature of boiling water.
   6. Estimation is a skill one learns by practice.
   7. Gram is a submultiple of kilogram.
   8. Space occupied by an object is called its surface area.
4. 4.

   With proper reasoning, choose the odd one out :

   1. metre, second, hour, century 
   2. kilogram, gram, seconds, milligram
   3. beam balance, stopwatch, grocer's balance, electronic balance 
   4. clock, wristwatch, wall clock, stopwatch 
   5. metre, newton, kelvin
5. 5.

   Match the following :

   Column  A	Column  B
   1. Length of an object	a. Stopwatch
   2. SI unit of mass	b. Thread and ruler
   3. SI unit of time	c. Metre scale
   4. Measurement of body temperature	d. Clinical thermometer
   5. Area of a rectangle	e. Length × Breadth
   6. Time interval	f. Kilogram
   7. Measurement of mass of gold	g. Second
   8. Length of a curved object	h. Digital balance

    

6. 6.

   Name the units in which you need to express the following :

   1. Distance from Kolkata to New Delhi
   2. Thickness of a coin 
   3. Your age
   4. Amount of sugar bought
   5. Temperature of hot tea
   6. Speed of your school bus
   7. Time taken in 100m race
   8. Time taken to have your lunch
   9. Duration of winter vacation 
   10. Weighing a gold ring 
   11. weighing a sack of rice
   12. Distance between thw Earth and the sun