Tag: motion and measurement

Questions Related to motion and measurement

Unit of heat in S. I. system

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Watt

  2. Newton/ Meter

  3. Ergs / Sec

  4. Joule

Show answer
Correct Option: D
Explanation:

Heat is a form of energy that flow from a hotter body to a colder one.

S.I. unit of heat: Joul, Joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one meter.
Option D.

1 Kilocalorie $=$ ..................... joules.

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $4000$

  2. $5000$

  3. $4200$

  4. None of these

Show answer
Correct Option: C
Explanation:

Calorie is defined as the amount of heat energy needed to raise the temperature of one gram of pure water by one degree Celsius. $1$ Kilocalorie are $1000$ calories, the amount of caloric energy needed to raise the mass of$1$ kg of pure water by $1^0C$. $1$ kilocalorie is $4200$ Joules.

Option C. 

Which of the following is not a characteristic of the standard unit?

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. It should be of convenient size.

  2. It should change with respect to space and time.

  3. It should not be perishable.

  4. It should be easily reproducible.

Show answer
Correct Option: B
Explanation:

Standard unit does not change with respect to time and space. Thus option B is correct.

In the SI system, the unit of temperature is:

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Degree centigrade

  2. Kelvin

  3. Degree celsius

  4. Degree Fahrenheit

Show answer
Correct Option: B
Explanation:

The S.I. unit of temperature as per the International System of Units is Kelvin which is represented by the symbol $K$. The Kelvin scale is widely accepted or used in the field of science and engineering.

The dimensions of $\varepsilon _0\frac {d \Phi _E  }{  dt} $ is (where symbols has their usual meaning)

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $[AT]$

  2. ${A}$

  3. $[ML^2T^{-2}]$

  4. $[ML^{-2}T^{-2}]$

Show answer
Correct Option: A

The measure of motion of a body is 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Speed

  2. Velocity

  3. Momentum

  4. Inertia

Show answer
Correct Option: C
Explanation:

The main quantity that measures the motion of a body is momentum. An object's momentum increases with the object's mass and with its velocity.

Unit of magnetic moment is

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Ampere-metre$^ { 2 }$

  2. Ampere-metre

  3. Weber-mettre$^ { 2 }$

  4. Weber/metre

Show answer
Correct Option: A
Explanation:

When current $ I $ flow in the circular loop of area $a$ than , magnetic moment will be $M=Ia= Am^2$

Ampere-hour is the unit of :

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. power

  2. energy

  3. quantity of electricity

  4. strength of current

Show answer
Correct Option: C
Explanation:

Ampere-hour is the unit of quantity of electricity or quantity of electric charge.

Power is measured in Watt.
Energy is measured in Joules.
Strength of current ia measured in Amperes.

In S.I . system value of G is ......${ Nm }^{ 2 }/{ kg }^{ 2 }$ 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $7.673\times 10^{ -11 }$

  2. $6.763\times 10^{ -11 }$

  3. $6.673\times 10^{ -11 }$

  4. $7.367\times 10^{ -11 }$

Show answer
Correct Option: C

$SI$  unit of strain is

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $N / m ^ { 2 }$

  2. $m$

  3. $N - m$

  4. no unit

Show answer
Correct Option: D