Tag: physics

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Questions Related to physics

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

The 'rad' is the correct unit used to report the measurement of

  1. the rate of decay of radioactive source

  2. the ability of a beam of gamma ray photons to produce ions in a target

  3. the energy delivered by radiation to a target

  4. the biological effect of radiation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rad is the unit of absorbed dose of ionizing radiation. One rad is equal approximately to the absorbed dose delivered when soft tissue is exposed to one-roentgen of medium-voltage radiation. Thus this is the bilogical effect of radiation.

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

Which of the following statements below should be followed while using the symbol for a unit of a physical quantity?

  1. The symbol named after scientist should have capital letter.

  2. They take plural forms.

  3. They can be written in full.

  4. They should be written only in the agreed symbols.
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

1. They symbol named after scientist should have the capital letter, 

2. They can be written in full 
3. They should be written only in the agreed symbols be used while using the symbol for a unit of a physical quantity. 
4. They cannot take plural forms.

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

Unit of heat in S. I. system

  1. Watt

  2. Newton/ Meter

  3. Ergs / Sec

  4. Joule
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. $4000$

  2. $5000$

  3. $4200$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

In the SI system, the unit of temperature is:

  1. Degree centigrade

  2. Kelvin

  3. Degree celsius

  4. Degree Fahrenheit
Reveal answer Fill a bubble to check yourself
B Correct answer
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.