51. The final image produced by a simple microscope is ___?
A simple microscope uses a convex lens to magnify objects. When the object is placed within the focal length of the lens, the image cannot be projected on a screen, making it virtual. The lens also makes the image appear upright, so it is erect. This is why simple microscopes are widely used for viewing small objects like biological samples.
52. Which instrument detects light?
A photodiode works on the principle of the photoelectric effect. When light photons strike its surface, they generate electron-hole pairs, producing current. Because of this property, photodiodes are widely used in cameras, solar panels, and optical communication systems. They are highly sensitive to changes in light intensity, making them reliable detectors.
53. Which instrument is used for analyzing polarized light?
Polarizers work by allowing only light waves oscillating in a specific direction to pass through. This helps in analyzing the polarization of light, which has applications in optics, photography, and scientific research. Polarization is important for reducing glare in sunglasses and improving contrast in optical instruments. Without polarizers, studying the orientation and behavior of polarized light would not be possible.
54. Which instrument studies the spectrum of luminous bodies?
A spectrometer separates light into its component wavelengths to produce a spectrum. This allows scientists to study the composition of stars, flames, or other luminous sources. The patterns of absorption and emission lines provide valuable information about chemical elements. Spectroscopy is a crucial tool in astronomy, chemistry, and physics for identifying substances and studying their properties.
55. Which instrument converts low voltage to high voltage and vice versa?
Transformers work on the principle of electromagnetic induction. By adjusting the number of turns in the primary and secondary coils, voltage can be stepped up or stepped down. They are vital for transmitting electrical power over long distances, as high voltage minimizes energy loss. Without transformers, efficient electricity distribution would not be possible.
56. What is used to observe the retina?
The ophthalmoscope directs light into the eye and uses lenses to magnify the retina. This allows doctors to check for diseases such as diabetic retinopathy, glaucoma, and retinal detachment. It provides a clear view of blood vessels and the optic nerve. Regular retinal observation is critical for early detection of eye-related health issues.
57. What is the principle of sonar?
SONAR (Sound Navigation and Ranging) involves sending sound waves underwater and measuring the time taken for the echo to return. The reflection of sound helps in determining the distance and shape of underwater objects. It is widely used in submarines, navigation, and fish finding. The same principle also aids in mapping the ocean floor and detecting obstacles.
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.
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