Physical Quantities

Q.

How do we convert 1 g/cm³ to kg/m³?

Q.

What is a scalar quantity?

Q.

Express the following speed in $m/s$ (metres per second):

$60km/hr$

Q.

Speed of $90km/h$ when expressed in $m/s$ is _____.

1. $9000m/s$

2. $90m/s$

3. $25m/s$

4. $20m/s$

Q.

Express the following speed in $km/hr$:

$20m/s$

Q. Dimensional formula $M{L}^{-1}{T}^{-2}$ does not represent the physical quantity

1. Young's modulus of elasticity
2. Stress
3. Strain
4. Pressure

Q.

The SI unit of universal gas constant (R) is

1. Watt K^-1 mol^-1
2. Newton K^-1 mol^-1
3. Joule K^-1 mol^-1
4. Erg K^-1 mol^-1

Q.

Which of the following is not the unit of density?

1. $kg{m}^{-3}$

2. $g{m}^{-3}$

3. $gc{m}^{-3}$

4. $gc{m}^{-2}$

Q.

Which of the following units is used to express frequency?

1. Watt

2. Newton

3. Pascal

4. Hertz

Q.

The mass of an iron ball is $312g$. The density of iron is $7.8gc{m}^{-3}$. Find the volume of the ball.

Q. Which of the following quantities fall under physical quantities?

1. Mass
2. Distance
3. Temperature
4. Pain

Q.

Convert the following speeds from $m/s$ to $Km/h$.

$125m/s$

Q. Match the Columns and choose the correct answer(s)

कॉलमों का मिलान कीजिए और सही उत्तर का चयन किजिये

	Column (कॉलम) I		Column (कॉलम) II
(A)	Temperature ताप	(P)	Meter मीटर
(B)	Speed चाल	(Q)	Second सेकण्ड
(C)	Distance दूरी	(R)	Meter/second मीटर/सेकण्ड
(D)	Time समय	(S)	Celsius सेल्सियस

1. A(R), B(S), C(P), D(Q)
2. A(S), B(R)
3. C(P), D(Q)
4. C(R), D(S)

Q. Identify the device that is used to measure how fast a vehicle is moving.

1. Thermometer
2. Sundial
3. Speedometer
4. Odometer

Q.

The mass of a metal cube of volume $25c{m}^3$ is found to be equal to$150g$. Find the density of the metal.

Q.

Express the following speed in $km/hr$:

$12\frac{1}{2}m/s$

Q.

SI unit of gravitational constant is

1. Nm²kg²
   

2. Nm²kg^-2
   

3. Nm²s^-2
   

4. Nmkg^-2

Q.

The density of an object is defined as mass per unit volume.

1. True
2. False

Q.

Speedometer of a vehicle measures its___ speed.

Q.

An irregular solid, when placed on a centimetre graph paper and outline is drawn, covers 12 complete square and 8 incomplete squares. What is the approximate area bounded by the outline?

1. $16m^2$

2. $15m^2$

3. $16c{m}^2$

4. $15c{m}^2$

Q.

36 km/hr can be represented as:

1. 20 m/s

2. 10 m/s

3. 30 m/s

4. 40 m/s

Q. A force F is given by F=at + $b{t}^2$ , where t is time. What are the dimensions of a and b

1. 
2. 
3. 
4. 

Q.

The Martians use force(F) , acceleration (A) and time (T) as their fundamental physical quantities. The dimensions of length on Martians system are

1. F^-1 A^o T^-1
2. AT²
3. FT²
4. F^-1 A² T^-1

Q. A physical quantity can be measured.

1. True
2. False

Q.

What is density? State its SI unit.

Q. Match the following physical quantity to their unit.

Q.

Of the following quantities, which one has dimensions different from the remaining three

1. Force per unit area
2. Energy per unit volume
3. Product of voltage and charge per unit volume
4. Angular momentum per unit mass

Q. 1 kgf =

1. 9.8 N
2. 98 N
3. 980 N
4. 0.98 N

Q. Of the following quantities, which one has dimensions different from the remaining three

1. Force per unit area
2. Energy per unit volume
3. Product of voltage and charge per unit volume
4. Angular momentum per unit mass

Q. Does a physical quantity have to have a dimension?

1. False
2. True