Physical Quantities and Measurement

Q.

Write the full form of CGS, FPS, MKS, and SI?

Q.

What is meant by measurement ?

Q.

What are derived physical quantities?

Q.

Name the S.I. Unit of mass and define it.

Q. The mass of the Mount Everest is 810 Trillion kilograms. Express it in megatonne. (1 megatonne = ${10}^6$ tonne)

1. 810000

Q.

State two units of mass bigger than a kilogram. Give their relationship with the kilogram.

Q.

State two units of mass smaller than a kilogram. How are they related to the kilogram ?

Q.

Name two units of time bigger than a second. How are they related to the second ?

Q.

The mass of the earth is 5.97 x 10²⁴ kg. Its order of magnitude will be

1. 10²⁵

2. 24

3. 10²⁴

4. 25

Q. A standard unit should:

1. Not change with the change in place
2. Be convenient in size
3. Not change with time
4. All of these

Q.

The magnitude of a physical quantity is expressed as

Physical quantity = ___ $\times$ unit

Q.

The speed at any instant of time is known as

1. average speed

2. instantaneous speed

3. velocity

4. given speed

Q.

A bag contains a book weighing 2 kg 50 g, a box weighing 375 g and a notebook weighing 1 kg 250 g. What is the total weight of the bag?

1. 3kg 575 grams

2. 3kg 675 grams

3. 4kg 675 grams

4. 3kg 875 grams

Q.

What do you mean by measurement?

Q.

In the British system of units, what is the unit of length?

1. Metre (m)

2. Kilometre (km)

3. Centimetre (cm)

4. Foot (ft)

Q.

Can you find the volume of a stone using a measuring jar and sand instead of water? explain how.

Q.

A calorimeter of mass $50g$ specific heat capacity $0.42J{g}^{-1}{}^o{C}^{-1}$ contains some mass of water at ${20}^{o}C$. A metal piece of mass $20g$ at ${100}^{o}C$ is dropped into the calorimeter. After stirring, the final temperature of the mixture is found to be ${22}^{o}C$. Find the mass of water used in the calorimeter. (Take specific heat capacity of the metal piece $0.3J{g}^{-1}{}^o{C}^{-1}$, specific heat capacity of water $4.2J{g}^{-1}{}^o{C}^{-1}$)

Q.

The mass of large heavenly bodies is measured in terms of ___, one of which is equal to the mass of the sun.

Q. The SI unit of distance is metre.

1. False
2. True

Q.

The speed of very slow-moving objects is measured in

1. $\raisebox{1ex}{$km$}\!\left/ \!\raisebox{-1ex}{$h$}\right.$

2. $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$

3. $\raisebox{1ex}{$cm$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$

Q.

$10m{s}^{-1}$ is equal to $36kmh{r}^{-1}$.

1. False

2. True

Q.

A physical quantity necessarily needs to have a dimension.

1. True

2. False

Q.

If the magnitudes of distance and force are increased four times, then the magnitude of energy is increased by ___ times.

Q.

Fill in the blank.

Mass of the earth is in order of __________.

Q.

The unit of velocity is a ___ unit.

Q.

What is the SI, CGS, FPS system of measurement ?

Q.

20 L 150 mL = _____ mL

1. 20150

2. 21500

3. 21150

4. 20015

Q.

Name the physical quantities related to the following units :

(a) $k{m}^2$ (b) newton (c) joule

(d) pascal (e) watt

Q.

one quintal is one-tenth of a tonne.

1. True
2. False

Q.

A quantity that can be measured is known as

1. measured quantity

2. known quantity

3. chemical quantity

4. physical quantity