# MCQs on Electrical And Electronics Measurements

01․ Which of the following quantities consists of S.I. unit as Hertz?

Frequency defined as the number of cycles per second and discovered by German physicist Heinrich Hertz. The S.I. unit of frequency is Hertz.

02․ Which one of the following units is a fundamental unit?

The ampere is the basic unit specifically in the SI unit system of measurement but other systems of measurement use different base units. Newton, Watt and Joules/sec are constructed by more than one fundamental unit.

03․ Which of the quantity consists of SI unit as Candela?

Candela is the unit of luminous intensity. Luminous intensity is the amount of light emitting from a point source per unit of solid angle from a point source.

04․ Which of the quantity consists of unit as Pascal ?

Pascal is the SI unit for pressure named after Blaise Pascal, French mathematician. Force per unit area is known as pressure.

05․ Which of the quantity consists of unit as newton-second?

The SI unit of impulse is called Newton second (N-s). Integral of force over a time is called impulse.

06․ Which of the quantity consists of unit as kg m/sec ?

The kilogram-meter per second is the standard unit of momentum. It is the product of mass and velocity.

07․ What is the standard unit for length ?

The basis of length units for the metric system is the meter. It is the international standard SI unit of length.

08․ What is the name of physical quantities which are independent of each other?

The fundamental quantities are those which are independent and are not derived from other quantities example length, mass, temperature etc.

09․ The Metric System is also called as:

The metric system uses the three base units: Length, Mass, Volume. MKS system (Meter, Kilogram, Second).

10․ Which devices used to measure the temperature of an object ?

A thermometer is a device that measures temperature or temperature gradient.

11․ What are the SI units of mass, length and time respectively?

Kilogram, metre and second are the SI units of mass, length and time respectively.

12․ Which of the two have same dimensions?

Angular Velocity (ω) is change in angular displacement per unit time. It is also expressed as linear velocity/displacement.
So, dimension of ‘ω’= M

^{o}LT^{-1}/L = T^{-1}. Angular Frequency (f) is defined as rate of change of angular displacement. It is the reciprocal of time period. So dimension of ‘f’ is T^{-1}. Hence, dimensional formula of angular velocity is same as dimensional formula of angular frequency.13․ What is the expression for acceleration?

14․ How many fundamental units are there ?

There are seven fundamental units: kilogram (mass), meter(length), candela (luminous intensity), second (time), ampere (current), kelvin (temperature), and mole (amount of substance).

15․ What is the expression for momentum?

16․ What is the unit of plane angle?

The derived SI unit for plane angle is radian (rad).

17․ Resistance of a VARISTOR varies with

A varistor (variable resistor) is an electronic component whose electronic resistance varies with the applied voltage. It is also known as voltage dependent resistor (VDR).

18․ Relative permittivity can be measured by _______ bridge

The word relative permittivity is associated with the capacitance. Since, the Scherings bridge is used to find out the unknown value of capacitance, dielectric loss, relative permittivity. After finding the capacitance, we can find out the relative permittivity by using the formula,
Here, C

_{0}is the capacitance of a test capacitor and the C_{x}is the measured capacitance by Scherings bridge.19․ _______ is used to measure the flow of air around aeroplane.

The basic application of anemometer is to measure the wind velocity (or) flow of air. It is applicable in aeroplane, wind mills, etc.

20․ Null type recorders are

The recorders based on the working principle of self balancing or null conditions are called potentiometric recorders.

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