Q11. What is the primary purpose of an Electrocardiogram (ECG)?
a) Measure blood pressure
b) Measure lung capacity
c) Record heart’s electrical activity
d) Measure body temperature
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Correct Answer: c) Record heart’s electrical activity
Explanation: An Electrocardiogram (ECG) is a simple, non-invasive test that records the electrical activity of the heart. It is used to diagnose various heart-related conditions, such as arrhythmias, coronary heart disease, and heart attacks. The test involves placing electrodes on the chest, arms, and legs, which are connected to an ECG machine. The machine then measures and interprets the electrical signals produced by the heart, displaying the results as a trace on a screen or paper.
Q12. What does a Cathetometer measure?
a) Electric current
b) Vertical distances
c) Wind speed
d) Sound intensity
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Correct Answer: b) Vertical distances
Explanation: A Cathetometer is an instrument used to measure vertical distances in cases where a scale cannot be placed very close to the points whose distance apart is desired. It consists of an accurately graduated scale and a horizontal telescope capable of being moved up and down a rigid vertical column. The position of the telescope can be read by means of an attached Vernier scale.
Q13. What is the primary function of a Chronometer?
a) Measure wind speed
b) Measure electric current
c) Accurately measure time
d) Record time with great accuracy
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Correct Answer: c) Accurately measure time
Explanation: A Chronometer is an instrument for accurately measuring time. It is a precision timekeeping device, particularly used for determining longitude at sea. A chronometer has passed intense precision tests over a 15-day period and has obtained an official rate certificate from the COSC, which is the Official Swiss Chronometer Testing Institute.
Q14. What does a Colorimeter measure?
a) Electric current
b) Wind speed
c) Absorbance and transmittance of light in a liquid sample
d) Sound intensity
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Correct Answer: c) Absorbance and transmittance of light in a liquid sample
Explanation: A Colorimeter is a light-sensing device used to measure the absorbance and transmittance of light as it moves through a liquid sample. It is commonly used in chemistry to determine the concentration of a solution by analyzing color intensity.
Q15. What is the primary function of a Commutator?
a) Measure wind speed
b) Measure electric current
c) Periodically reverse the current direction in electric motors and generators
d) Measure sound intensity
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Correct Answer: c) Periodically reverse the current direction in electric motors and generators
Explanation: A Commutator is a rotary electrical switch used in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a set of contact bars fixed to the rotating shaft of a machine and connected to the armature windings.
Q16. What does a Cryometer measure?
a) Electric current
b) Wind speed
c) Very low temperatures
d) Sound intensity
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Correct Answer: c) Very low temperatures
Explanation: A Cryometer is a thermometer used to measure very low temperatures of objects. It is specifically designed to measure significant low temperatures of any object, such as those found in space or in certain laboratory settings.
Q17. What does a CT Scan primarily detect?
a) Electric current
b) Wind speed
c) Internal body structures
d) Sound intensity
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Correct Answer: c) Internal body structures
Explanation: A CT (Computed Tomography) Scan is a medical imaging technique that uses a series of X-ray images taken from different angles to create detailed cross-sectional images of internal body structures. It is commonly used to diagnose and monitor various health conditions, including tumors, infections, and injuries.
Q18. What is the primary function of a Cyclotron?
a) Measure electric current
b) Accelerate charged particles
c) Measure wind speed
d) Measure sound intensity
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Correct Answer: b) Accelerate charged particles
Explanation: A Cyclotron is a type of particle accelerator that uses a combination of electric and magnetic fields to accelerate charged particles, such as protons, to high energies. It is used in various applications, including medical treatments, scientific research, and the production of radioactive isotopes for medical imaging.
Q19. What does a Dilatometer measure?
a) Electric current
b) Wind speed
c) Expansion or contraction of materials
d) Sound intensity
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Correct Answer: c) Expansion or contraction of materials
Explanation: A Dilatometer is an instrument used to measure the expansion or contraction of materials as a function of temperature, pressure, or time. It is commonly used in materials science and engineering to study the thermal expansion, phase transitions, and other properties of materials.
Q20. What is the primary function of a Dynamo?
a) Measure electric current
b) Generate electric power
c) Measure wind speed
d) Measure sound intensity
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Correct Answer: b) Generate electric power
Explanation: A Dynamo is an electrical generator that converts mechanical energy into electrical energy, typically in the form of direct current (DC). It consists of a rotating coil of wire placed within a magnetic field, which induces an electric current in the coil as it rotates. Dynamos are used in various applications, including power generation, automotive charging systems, and portable power sources.