Updated 50+ MCQs of Scientific Instruments [Free] – General Science
1. The instrument used to measure pressure is ___?
Correct Answer: B. Barometer
Explanation: A barometer measures atmospheric pressure. It helps predict weather changes and is also used in altitude measurement.
2. Which instrument is used to measure voltage?
Correct Answer: A. Voltmeter
Explanation: A voltmeter is used to measure electric potential difference (voltage) between two points in an electric circuit.
3. What is used to measure the purity of milk?
Correct Answer: A. Lactometer
Explanation: A lactometer measures the density of milk, helping to check if it has been diluted with water.
4. Which instrument measures temperature?
Correct Answer: C. Thermometer
Explanation: A thermometer is used to measure temperature. It works on the principle of expansion of substances like mercury or alcohol with heat.
5. Which instrument measures the velocity of wind?
Correct Answer: B. Anemometer
Explanation: An anemometer measures wind speed and is widely used in weather stations, ships, and aircraft.
6. Which instrument is used to measure the degree of humidity?
Correct Answer: A. Hygrometer
Explanation: A hygrometer is used to measure humidity, the amount of water vapor present in the air.
7. What instrument measures blood pressure?
Correct Answer: C. Sphygmomanometer
Explanation: A sphygmomanometer measures blood pressure, using a cuff to restrict blood flow and a gauge to read the pressure.
8. Which instrument is used for measuring radioactivity?
Correct Answer: D. Geiger Counter
Explanation: A Geiger counter detects and measures radiation levels, commonly used in laboratories and nuclear plants.
9. What is used to measure rainfall?
Correct Answer: C. Rain Gauge
Explanation: A rain gauge collects and measures the amount of rainfall over a period of time.
10. Which instrument records seismic waves of earthquakes?
Correct Answer: A. Seismograph
Explanation: A seismograph detects and records vibrations of the Earth during an earthquake, helping scientists study its strength and origin.
11. Which instrument is used to measure the sensitivity of skin?
Correct Answer: B. Algeometer
Explanation: An algeometer is used to measure sensitivity of the skin, especially to pain or pressure. Doctors and researchers use it to study nerve response and pain thresholds.
12. Which instrument measures the quantity of heat?
Correct Answer: A. Calorimeter
Explanation: A calorimeter measures the quantity of heat released or absorbed during a process. It is often used in experiments involving chemical reactions or changes in state.
13. What instrument measures the intensity of colors?
Correct Answer: A. Colorimeter
Explanation: A colorimeter measures the intensity or concentration of colors in a solution. It works by analyzing how light passes through a colored liquid.
14. Which instrument is used to measure the voltage difference?
Correct Answer: C. Voltmeter
Explanation: A voltmeter is used to measure the electrical potential difference between two points in a circuit. It helps monitor voltage levels safely.
15. Which instrument is used to measure small electric current?
Correct Answer: C. Galvanometer
Explanation: A galvanometer measures very small electric currents. It is sensitive and can detect even weak current flow in circuits.
16. Which instrument measures relative density of liquids?
Correct Answer: A. Hydrometer
Explanation: A hydrometer floats in a liquid to measure its relative density compared to water. It is commonly used in industries like brewing and battery maintenance.
17. Which instrument is used for measuring changes in atmospheric humidity?
Correct Answer: A. Hygrometer
Explanation: A hygrometer is used to measure the amount of water vapor (humidity) in the air. It is important for weather forecasting and climate studies.
18. Which instrument is used for the detection and measurement of light?
Correct Answer: B. Photoelectric Cell
Explanation: A photoelectric cell detects and measures light by converting it into electrical signals. It is used in devices like light meters and automatic lighting.
19. What instrument is used to measure the salinity of water?
Correct Answer: A. Salinometer
Explanation: A salinometer measures the amount of dissolved salts in water. It is often used in ocean studies, aquariums, and water treatment.
20. What is used for spectrum analysis?
Correct Answer: C. Spectroscope
Explanation: A spectroscope is used for spectrum analysis by splitting light into its different colors or wavelengths. It helps study materials based on their light patterns.
21. Which instrument maintains a constant temperature?
Correct Answer: A. Thermostat
Explanation: A thermostat regulates and maintains a constant temperature by controlling heating or cooling devices.
22. What amplifies electric current?
Correct Answer: A. Amplifier
Explanation: An amplifier boosts the strength of an electrical signal, making weak currents stronger for use in devices like radios and speakers.
23. Which instrument measures potential difference between two points?
Correct Answer: A. Voltmeter
Explanation: A voltmeter is designed to measure the potential difference (voltage) between two points in an electric circuit.
24. Which instrument is used to measure the flow of air?
Correct Answer: B. Anemometer
Explanation: An anemometer is an instrument that measures wind speed and the flow of air, often used in meteorology.
25. Which instrument is used to measure the density of gases?
Correct Answer: C. Aerometer
Explanation: An aerometer is specifically designed to measure the density of gases or liquids.
Scientific Instruments MCQs are an integral part of competitive exams, especially in the General Science section, where they test an aspirant’s knowledge of the tools used in scientific research and practical applications.
These questions are commonly asked to evaluate the understanding of various instruments like microscopes, thermometers, barometers, and voltmeters, along with their uses and measurements.
Mastering scientific instruments MCQs can significantly impact an aspirant’s score, as they often account for a considerable portion of the exam, helping candidates stand out. The knowledge of scientific instruments also plays a vital role in job hunting, particularly in fields like research, engineering, healthcare, and laboratories, where a deep understanding of these tools is crucial for practical work.
In competitive exams, every mark counts—one mark can make your placement and keep you in the competition, while that same one mark can also make you out of the competition. Therefore, preparing thoroughly for these MCQs is essential. To make this process easier for aspirants, our team has prepared a comprehensive list of MCQs on scientific instruments, ensuring you are well-equipped to succeed in your exams.