Units and Their Standardization

Q. The is the standard unit for measuring length.

1. kilometre
2. metre
3. gram
4. kilogram

Q.

Express $45mm$ in $cm$, $m$ and $km$ using decimal.

Q.

what are some ancient time measuring devices.

Q.

What is a sundial

Q.

The SI unit of speed is?

Q.

Why is foot not used as the standard unit of length? [2 MARKS]

Q.

The work done by the tension in the string of a simple pendulum during one complete oscillation is equal to:

1. KE of the pendulum

2. PE of the pendulum

3. Zero

4. Total energy of the pendulum

Q. What is the difference between wrist watch and a stop watch?

Q.

What is the need of standard unit for measurements? [2 MARKS]

Q.

Convert:

20 cm = ___ m.

Q.

What kind of watch will you use to accurately measure short intervals of time?

Q.

Temperature unit adopted by india

Q. numerical question
Show that 1 km/h = 5/18 m/s

Q.

A year starting with Monday and ending with Tuesday. How many days are there from $16th$ January to $15th$ march of that year?

Q.

What is the convenient unit of length used to measure a hall?

Q.

___ unit is the system of units which has been accepted internationally and is common throughout the world.

Q. Identify the correct S.I. units for the given quantities.

1. Speed:- second
   Time:- metre/second
2. Speed:- kilometre/hour
   Time:- second
3. Speed:- kilometre/hour
   Time:- minute
4. Speed:- metre/second
   Time:- second

Q.

If we have a meter scale, then how many divisions do we need to make such that each division is equal to a centimeter?

1. 20

2. 100

3. 10

4. 1000

Q. Which of the following is/are required to completely specify length?

1. Both magnitude and unit
2. Neither magnitude nor unit
3. Only unit
4. Only magnitude

Q. The basic unit of time is second.

1. True
2. False

Q.

What are the advantages and disadvantages of using a rod of given length as a unit of length ?

Q. Which of the following clocks is most accurate?

1. Simple pendulum
2. Stop watch
3. Caesium clock
4. Hourglass

Q. The odometer of a vehicle measures a quantity whose SI unit is_______.

1. $m$
2. $m{s}^{-1}$
3. $km$
4. $km{h}^{-1}$

Q.

Metric system was first introduced in:

1. America

2. India

3. France

4. England

Q.

Select the correct option:

10 mm = ____ m

1. 10

2. 0.01

3. 1

4. 0.1

Q. Measurement of time can be done with the help of a:

1. Speedometer
2. Meter scale
3. Pulley
4. Simple pendulum

Q. In order to measure very short intervals, we mostly use :

1. stop clocks
2. stop watches
3. A and B
4. wall clocks

Q.

Convert $45$ $dm$ into $hectometre$.

Q. A person has two hourglasses, one of $30seconds$ and the other of $1minute$. Which of the following time intervals can he not measure?

1. $30seconds$
2. $60seconds$
3. $50seconds$
4. $90seconds$

Q.

Which of the following is the most suitable standard for measurement of length?

1. Foot of a person

2. Distance travelled by light in (1/299792458) s

3. A rod

4. Either of the above