Fundamental and Derived Units

Q.

Pressure of 1 atm is _________ Pa

Q.

What are the fundamental units in S.I. system ? Name then along with their symbols.

Q.

1 hp is equal to _____________ .

Q.

Name the three systems of unit and state the various fundamental units in them.

Q.

Explain the meaning of derived unit with the help of one example.

Q.

The mass of an oxygen atom is 16.00u. Find its mass in kg.

Q.

What is the average density of the Earth?

Q.

The SI unit of amount of substance is___ .

Q.

Which of the following unit is not a fundamental unit :

(a) metre (b) litre

(c) second (d) kilogram.

Q.

A man spends 6.4kJ energy in displacing a body by 64m in the direction in which he applies force in 2.5s.Calculate :

1-the force applied

2-the power spent(in H.P.

) by the man

Q.

What is a lunar month?

Q.

The wavelength of light of a particular colour is 5800 $A^{\circ }$. Express it in

(a) nanometre and

(b) metre.

Q.

'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.

Q.

What is linear mass density?

Q. The pitch of a screw gauge is 1mm and there are 50 divisions on its cap. When nothing is put in between the studs , 44th division of circular scale coincides with reference line. When a glass plate is placed between the studs, the main scale reads three divisions and the circular scale reads 26 division. The thickness of the plate is-

Q.

What is work, energy, and power?

Q.

How do you measure light intensity?

Q.

It takes 5 years for light to reach the earth from A Star. Express the distance of Star from the earth in (a) Light year (b) km.

Q.

What is Candela in physics?

Q.

What is the SI unit of angle?

1. Degree

2. Radian

3. arc

4. pi

Q. A electron intially at rest falls a distance of 1.5 cm in a uniform electric field of magnitude 2 x 10 to the power 4N/C. then what will be the time take by the to fall the diatance is.

Q.

The size of a bacteria is 1 $\mu$. Find the number of bacteria in 1 m length.

Q. How much watt are there in one horse power

Q.

The wavelength of light is 589 nm. What is its wavelength in A${}^{\circ }$ ?

Q. Dimensional formula $M{L}^{-1}{T}^{-2}$ represents the physical quantity of strain.

1. Young's modulus of elasticity
2. Stress

Q.

Find the energy in kWh consumed in 10 hrs by a machine of power 500W.

Q.

What are the characteristics of mass?

Q.

Is time a dimension?

Q.

The unit of time is :

(a) light year (b) parsec

(c) leap year (d) angstrom.

Q.

The SI unit of density is kg/m³.

1. True
2. False