Scientific Instruments - Free MCQ Practice Test with solutions, SSC CGL

An altimeter is the instrument used in aeroplanes to measure altitude. It is crucial for pilots to accurately determine the altitude above sea level, aiding in safe navigation and flight operations.

An ammeter is an instrument used for measuring the strength of electric current in amperes. It plays a significant role in electrical systems to monitor and regulate the flow of current.

A calorimeter is utilized to measure how much heat a material emits or absorbs. It is commonly used in thermodynamics and chemistry to study heat transfer processes and reactions.

A spectrometer is an instrument used to measure the intensity of light absorbed by a substance. It is extensively used in various scientific fields like chemistry and biology for analyzing and identifying different materials based on their light absorption properties.

A refractometer is designed to measure the refractive index of a substance, providing valuable information about how light propagates through different materials. This tool finds applications in areas like optics, chemistry, and food science.

A seismograph is instrumental in measuring the intensity of earthquake shocks. It helps in monitoring and recording seismic activity, providing crucial data for studying earthquakes and understanding seismic events.

A lactometer is used to determine the purity of milk by measuring its density or specific gravity. This tool aids in assessing the quality and authenticity of milk products.

A sphygmomanometer is primarily used for measuring blood pressure. It consists of an inflatable cuff to restrict blood flow temporarily and a pressure gauge to determine systolic and diastolic blood pressure readings.

A hydrometer is an instrument used to determine the specific gravity of liquids. By measuring the density of a liquid compared to water, it helps in assessing parameters like salinity, sugar content, and alcohol concentration.

A dynamometer is utilized to compute power, torque, and force in various mechanical systems. It plays a crucial role in assessing the performance and efficiency of engines, motors, and other mechanical devices.

A potentiometer is primarily used for comparing the electromotive force of cells. By adjusting the voltage in a circuit, it helps in determining and calibrating electrical potentials accurately.

A rain gauge is an apparatus designed to measure the amount of liquid precipitation, typically rainfall, over a specific period. It is an essential tool in meteorology and hydrology for monitoring and recording precipitation levels.

A speedometer is an instrument placed in a vehicle to record its speed. It provides real-time information to the driver about the vehicle's velocity, aiding in safe driving practices and adherence to speed limits.

A sextant is used by navigators to find the latitude of a place by measuring the elevation above the horizon of celestial objects like the sun or stars. This tool has been crucial in maritime navigation for centuries.

A galvanometer is an instrument primarily used to measure small-amplitude electric currents. It is essential in various applications, including electrical engineering, physics experiments, and electronic circuit testing.