Important Scientific (125) MCQs with Answers

Atmospheric pressure is calculated by the ?

• A.Density of air in hygrometer
• B.Weight of air column in manometer
• C.Height of mercury column in barometer
• D.Speed of wind in anemometer

Which instrument is used to measure current, resistance, and potential difference?

• A.Oscilloscope
• B.Digital multimeter
• C.Galvanometer
• D.Ammeter

Laser yard is used for?

• A.Measuring temperature
• B.Levelling and aligning processes
• C.Detecting earthquakes
• D.Measuring blood pressure

Past Paper MCQ

What is the minimum time interval that a mechanical stopwatch can measure?

• A.0.01 seconds
• B.0.001 seconds
• C.1.0 second
• D.0.1 seconds

Which of the following instruments is used for accurately measuring small electric currents?

• A.Ammeter
• B.Voltmeter
• C.Galvanometer
• D.Barometer

X-rays are electromagnetic radiations, lying between ultraviolet radiations and gamma rays in the spectrum. Which material is usually used as the target in an X-ray tube?

• A.Copper
• B.Tungsten
• C.Aluminum
• D.Lead

What is the primary purpose of HARP technology?

• A.To study the Earth’s ionosphere
• B.To detect underwater earthquakes
• C.To measure ocean salinity levels
• D.To monitor volcanic activity from space

How does a hollow cathode lamp contribute to the performance of atomic absorption spectroscopy (AAS)?

• A.It amplifies the electrical signal produced by the detector.
• B.It generates high-energy electrons to ionize the sample atoms.
• C.It cools the atomization chamber to prevent sample evaporation.
• D.It provides a stable and specific wavelength light source for the measurement.

Absolute uncertainty in a measuring instrument is equal to?

• A.Least count of the instrument
• B.Range of the instrument
• C.Percentage error of the instrument
• D.Half of the least count

The error caused by improper functioning of instrument is ?

• A.Systematic Error
• B.Random Error
• C.Gross Error
• D.Personal Error