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MCQs on Electrical And Electronics Measurements

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01․ Which of the following quantities consists of S.I. unit as Hertz?
Charge
Force
Frequency
Power

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?
Newton
Ampere
Watt
Joule/sec

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?
Velocity
Impulse
Luminous intensity
Force

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 ?
Temperature
Pressure
Force
Impulse

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?
Impulse
Acceleration
Speed
velocity

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 ?
Speed
Momentum
Acceleration
Impulse

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 ?
Meter
Inch
Kilometer
Centimeter

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?
Fundamental quantity
Derived quantity
Numerical quantity
None of the above

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:
CGS
MKS system
SI
None of the above

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 ?
Poteintiometer
Odometer
Thermometers
Galvanometer

A thermometer is a device that measures temperature or temperature gradient.
11․ What are the SI units of mass, length and time respectively?
g, m and s.
kg, cm and s.
g, cm and s.
kg, m and s.

Kilogram, metre and second are the SI units of mass, length and time respectively.
12․ Which of the two have same dimensions?
Force and strain
Angular velocity and angular frequency
Force and stress
None of the above

Angular Velocity (ω) is change in angular displacement per unit time. It is also expressed as linear velocity/displacement. So, dimension of ‘ω’= MoLT -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?
Mass x velocity
Change in velocity / time
Mass x acceleration
Force x displacement

14․ How many fundamental units are there ?
4
6
8
7

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?
force × displacement
mass × velocity
mass × acceleration
change of velocity / time

16․ What is the unit of plane angle?
Steradian
Candela
Radian
Degree

The derived SI unit for plane angle is radian (rad).
17․ Resistance of a VARISTOR varies with
Current
Voltage
Temperature
Both Voltage and Temperature

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
Wheatstones.
Hays.
Desautys.
Schering.

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, C0 is the capacitance of a test capacitor and the Cx is the measured capacitance by Scherings bridge.
19․ _______ is used to measure the flow of air around aeroplane.
Anemometer.
Venturimeter.
Orifice.
nucleus.

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
bridge recorders.
LVDT recorders.
potentiometric recorders.
any one of the above.

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