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101. Which advantage of the SI system promotes international consistency in scientific communication?
ⓐ. Complexity
ⓑ. Ambiguity
ⓒ. Precision
ⓓ. Flexibility
Correct Answer: Precision
Explanation: The SI system promotes international consistency in scientific communication by ensuring precision in measurement units, allowing researchers worldwide to accurately replicate and verify experimental results.
102. How does the SI system contribute to reducing errors in scientific calculations?
ⓐ. By encouraging approximations
ⓑ. By promoting confusion
ⓒ. By ensuring uniformity and simplicity
ⓓ. By increasing complexity
Correct Answer: By ensuring uniformity and simplicity
Explanation: The SI system reduces errors in scientific calculations by providing uniform and simple measurement units, minimizing conversion errors and ensuring consistency in scientific data analysis.
103. Which advantage of the SI system facilitates ease of learning and application?
ⓐ. Complexity
ⓑ. Ambiguity
ⓒ. Consistency
ⓓ. Variability
Correct Answer: Consistency
Explanation: The SI system facilitates ease of learning and application due to its consistent use of measurement units across different scientific disciplines, promoting efficient communication and understanding among educators, researchers, and students.
104. How does the SI system contribute to global trade and commerce?
ⓐ. By promoting confusion
ⓑ. By facilitating fair competition
ⓒ. By encouraging arbitrary standards
ⓓ. By complicating international transactions
Correct Answer: By facilitating fair competition
Explanation: The SI system facilitates fair competition in global trade and commerce by providing standardized measurement units, ensuring transparency, accuracy, and fairness in product specifications and transactions.
105. Which advantage of the SI system supports advancements in technology and innovation?
ⓐ. Ambiguity
ⓑ. Uniformity
ⓒ. Inflexibility
ⓓ. Complexity
Correct Answer: Uniformity
Explanation: The SI system supports advancements in technology and innovation by providing uniform measurement units, enabling engineers and scientists to develop and integrate new technologies globally without compatibility issues.
106. How does the SI system contribute to environmental sustainability efforts?
ⓐ. By promoting inefficiency
ⓑ. By complicating resource management
ⓒ. By enabling accurate measurement and monitoring
ⓓ. By increasing pollution
Correct Answer: By enabling accurate measurement and monitoring
Explanation: The SI system contributes to environmental sustainability efforts by enabling accurate measurement and monitoring of environmental parameters such as air quality, water pollution, and energy consumption, facilitating informed decision-making and policy development.
107. Which advantage of the SI system is crucial for ensuring safety in scientific experiments?
ⓐ. Complexity
ⓑ. Precision
ⓒ. Ambiguity
ⓓ. Variability
Correct Answer: Precision
Explanation: Precision in measurement units provided by the SI system is crucial for ensuring safety in scientific experiments by accurately quantifying variables such as temperature, pressure, and chemical concentrations, minimizing risks and hazards.
108. How does the SI system promote efficiency in healthcare practices?
ⓐ. By promoting arbitrary standards
ⓑ. By increasing administrative burden
ⓒ. By ensuring accurate medical measurements
ⓓ. By complicating patient care
Correct Answer: By ensuring accurate medical measurements
Explanation: The SI system promotes efficiency in healthcare practices by ensuring accurate medical measurements, such as dosage calculations, patient monitoring, and diagnostic procedures, improving healthcare outcomes and patient safety.
109. Which advantage of the SI system supports international collaboration in scientific research?
ⓐ. Flexibility
ⓑ. Complexity
ⓒ. Uniformity
ⓓ. Inconsistency
Correct Answer: Uniformity
Explanation: The uniformity of measurement units in the SI system supports international collaboration in scientific research by facilitating data sharing, replication of experiments, and comparison of results across different countries and research institutions.
110. How does the SI system contribute to standardizing quality assurance practices in manufacturing?
ⓐ. By promoting variability
ⓑ. By ensuring product consistency
ⓒ. By complicating production processes
ⓓ. By increasing production costs
Correct Answer: By ensuring product consistency
Explanation: The SI system contributes to standardizing quality assurance practices in manufacturing by ensuring product consistency through precise measurement units, enabling manufacturers to maintain quality standards and meet consumer expectations globally.
111. Which non-SI unit is commonly used to measure angles?
ⓐ. Kelvin
ⓑ. Degree
ⓒ. Hertz
ⓓ. Newton
Correct Answer: Degree
Explanation: The degree (°) is a non-SI unit accepted for use with SI, commonly used to measure angles.
112. Which non-SI unit is used to measure pressure?
ⓐ. Pascal
ⓑ. Joule
ⓒ. Bar
ⓓ. Newton
Correct Answer: Bar
Explanation: The bar (bar) is a non-SI unit accepted for use with SI, commonly used to measure pressure.
113. Which non-SI unit is used to measure time intervals?
ⓐ. Hour
ⓑ. Second
ⓒ. Day
ⓓ. Minute
Correct Answer: Hour
Explanation: The hour (h) is a non-SI unit accepted for use with SI, commonly used to measure time intervals.
114. Which non-SI unit is used to measure volume?
ⓐ. Liter
ⓑ. Kilogram
ⓒ. Meter
ⓓ. Pascal
Correct Answer: Liter
Explanation: The liter (L or l) is a non-SI unit accepted for use with SI, commonly used to measure volume.
115. Which non-SI unit is used to measure electric capacitance?
ⓐ. Ohm
ⓑ. None (capacitance has SI unit farad)
ⓒ. Ampere
ⓓ. Volt
Correct Answer: None (capacitance has SI unit farad)
Explanation: Capacitance is measured in farads (F) (SI). There isn’t a standard non-SI unit accepted for capacitance.
116. Which non-SI unit is used to measure energy?
ⓐ. Calorie (cal)
ⓑ. Watt
ⓒ. Newton
ⓓ. Pascal
Correct Answer: Calorie (cal)
Explanation: Calorie is a non-SI unit (accepted for limited use). The SI unit of energy is joule.
117. Which non-SI unit is used to measure frequency?
ⓐ. Revolutions per minute (rpm)
ⓑ. Pascal
ⓒ. Newton
ⓓ. Ohm
Correct Answer: Revolutions per minute (rpm)
Explanation: rpm is a non-SI frequency unit. The SI unit is hertz (Hz).
118. Which non-SI unit is used to measure radiation dose?
ⓐ. Curie
ⓑ. Rad
ⓒ. Tesla
ⓓ. Weber
Correct Answer: Rad
Explanation: Gray (Gy) is SI; rad (Radiation Absorbed Dose) is a non-SI unit still seen in legacy contexts.
119. Which non-SI unit is used to measure force?
ⓐ. Pascal
ⓑ. Dyne
ⓒ. Ampere
ⓓ. Candela
Correct Answer: Dyne
Explanation: Dyne (CGS) is a non-SI unit of force. The SI unit is newton (N).
120. Which non-SI unit is used to measure information storage?
ⓐ. Byte
ⓑ. Hertz
ⓒ. Ohm
ⓓ. Lux
Correct Answer: Byte
Explanation: The byte (B) is a non-SI unit accepted for use with SI, commonly used to measure information storage.
121. Convert 2500 millimeters to meters.
ⓐ. 0.025 meters
ⓑ. 2.5 meters
ⓒ. 25 meters
ⓓ. 250 meters
Correct Answer: 2.5 meters
Explanation: $2500~\text{mm}=2500/1000=2.5~\text{m}$.
122. Convert 3 kilometers to meters.
ⓐ. 0.003 meters
ⓑ. 30 meters
ⓒ. 300 meters
ⓓ. 3000 meters
Correct Answer: 3000 meters
Explanation: 1 kilometer (km) = 1000 meters (m). Therefore, 3 km = 3 * 1000 = 3000 meters.
123. Convert 5000 grams to kilograms.
ⓐ. 0.05 kilograms
ⓑ. 5 kilograms
ⓒ. 50 kilograms
ⓓ. 500 kilograms
Correct Answer: 5 kilograms
Explanation: 1 gram (g) = 0.001 kilograms (kg). Therefore, 5000 g = 5000 * 0.001 = 5 kilograms.
124. Convert 8000 milliliters to liters.
ⓐ. 8.0 liters
ⓑ. 0.8 liters
ⓒ. 80 liters
ⓓ. 800 liters
Correct Answer: 8.0 liters
Explanation: 1 liter (L) = 1000 milliliters (mL). Therefore, 8000 mL = 8000 / 1000 = 8 liters
125. Convert 150 centimeters to meters.
ⓐ. 0.0015 meters
ⓑ. 0.015 meters
ⓒ. 1.5 meters
ⓓ. 15 meters
Correct Answer: 1.5 meters
Explanation: 1 centimeter (cm) = 0.01 meters (m). Therefore, 150 cm = 150 * 0.01 = 1.5 meters
126. Convert 4 hours to seconds.
ⓐ. 240 seconds
ⓑ. 14400 seconds
ⓒ. 1440 seconds
ⓓ. 3600 seconds
Correct Answer: 14400 seconds
Explanation: $4~\text{h}\times 3600~\text{s/h}=14400~\text{s}$.
127. Convert 500 square meters to square kilometers.
ⓐ. 0.005 square kilometers
ⓑ. 0.05 square kilometers
ⓒ. 0.0005 square kilometers
ⓓ. 50 square kilometers
Correct Answer: 0.0005 square kilometers
Explanation: $1~\mathrm{km^2}=10^{6}~\mathrm{m^2}\Rightarrow 500~\mathrm{m^2}=500/10^{6}=5\times10^{-4}~\mathrm{km^2}=0.0005~\mathrm{km^2}$.
128. Convert 2.5 kilometers per hour to meters per second.
ⓐ. 0.6944 meters per second
ⓑ. 2.7778 meters per second
ⓒ. 7.2 meters per second
ⓓ. 8.3333 meters per second
Correct Answer: 0.6944 meters per second
Explanation: 1 kilometer per hour (km/h) = 1/3.6 meters per second (m/s). Therefore, 2.5 km/h = 2.5 * 1/3.6 = 0.6944 meters per second.
129. Convert 500 square meters to square kilometers.
ⓐ. 0.005 square kilometers
ⓑ. 0.05 square kilometers
ⓒ. 5 square kilometers
ⓓ. 50 square kilometers
Correct Answer: 0.005 square kilometers
Explanation: 1 square kilometer (km²) = 1,000,000 square meters (m²). Therefore, 500 m² = 500 / 1,000,000 = 0.0005 square kilometers = 0.005 square kilometers.
130. Convert 1000 joules to kilojoules.
ⓐ. 0.001 kilojoules
ⓑ. 1 kilojoule
ⓒ. 10 kilojoules
ⓓ. 100 kilojoules
Correct Answer: 1 kilojoule
Explanation: 1 joule (J) = 0.001 kilojoules (kJ). Therefore, 1000 J = 1000 * 0.001 = 1 kilojoule.
131. Which unit of length is equal to \(10^{-9}\) meters?
ⓐ. Nanometer
ⓑ. Micrometer
ⓒ. Kilometer
ⓓ. Decimeter
Correct Answer: Nanometer
Explanation: 1 nanometer (nm) = \(10^{-9}\) meters (m).
132. Which unit of length is equal to 1000 meters?
ⓐ. Kilometer
ⓑ. Centimeter
ⓒ. Millimeter
ⓓ. Decimeter
Correct Answer: Kilometer
Explanation: 1 kilometer (km) = 1000 meters (m).
133. Which unit of length is equal to \(10^{-2}\) meters?
ⓐ. Decimeter
ⓑ. Centimeter
ⓒ. Kilometer
ⓓ. Millimeter
Correct Answer: Centimeter
Explanation: 1 centimeter (cm) = \(10^{-2}\) meters (m).
134. Which unit of length is smaller than a millimeter?
ⓐ. Micrometer
ⓑ. Decimeter
ⓒ. Kilometer
ⓓ. Hectometer
Correct Answer: Micrometer
Explanation: 1 micrometer (µm) is smaller than 1 millimeter (mm).
135. Which unit of length is equal to 0.01 meters?
ⓐ. Centimeter
ⓑ. Millimeter
ⓒ. Kilometer
ⓓ. Decimeter
Correct Answer: Centimeter
Explanation: 1 centimeter (cm) = 0.01 meters (m).
136. Which unit of length is equal to \(10^{-3}\) meters?
ⓐ. Millimeter
ⓑ. Micrometer
ⓒ. Kilometer
ⓓ. Centimeter
Correct Answer: Millimeter
Explanation: 1 millimeter (mm) = \(10^{-3}\) meters (m).
137. Which unit of length is equal to 100 centimeters?
ⓐ. Meter
ⓑ. Millimeter
ⓒ. Kilometer
ⓓ. Decimeter
Correct Answer: Meter
Explanation: 1 meter (m) = 100 centimeters (cm).
138. Which unit of length is larger than a kilometer?
ⓐ. Meter
ⓑ. Megameter
ⓒ. Millimeter
ⓓ. Centimeter
Correct Answer: Megameter
Explanation: $1~\text{Mm}=10^{6}~\text{m}=1000~\text{km}$. (Decameter is $10~\text{m}$, smaller than a kilometer.)
139. Which unit of length is equal to 10 meters?
ⓐ. Decimeter
ⓑ. Centimeter
ⓒ. Millimeter
ⓓ. Decameter
Correct Answer: Decameter
Explanation: 1 decameter (dam) = 10 meters (m).
140. Which unit of length is equal to 1000 millimeters?
ⓐ. Kilometer
ⓑ. Meter
ⓒ. Centimeter
ⓓ. Micrometer
Correct Answer: Meter
Explanation: 1 meter (m) = 1000 millimeters (mm).
141. Which unit of length is larger: kilometer or meter?
ⓐ. Kilometer
ⓑ. Meter
ⓒ. They are equal
ⓓ. It depends on the context
Correct Answer: Kilometer
Explanation: A kilometer (km) is larger than a meter (m). 1 kilometer equals 1000 meters. Kilometers are typically used to measure longer distances, such as between cities or countries, while meters are used for shorter distances.
142. Which unit of length is commonly used to measure the width of a human hair?
ⓐ. Micrometer
ⓑ. Millimeter
ⓒ. Centimeter
ⓓ. Decimeter
Correct Answer: Micrometer
Explanation: A micrometer (µm), also known as a micron, is commonly used to measure the width of a human hair. One micrometer is equal to \(10^{-6}\) meters, making it suitable for measuring very small distances like the diameter of cells or the thickness of materials.
143. Which unit of length is equivalent to 1000 micrometers?
ⓐ. Millimeter
ⓑ. Nanometer
ⓒ. Centimeter
ⓓ. Kilometer
Correct Answer: Millimeter
Explanation: 1 millimeter (mm) is equivalent to 1000 micrometers (µm). Millimeters are often used to measure lengths in everyday objects, such as the length of a pencil or the thickness of a sheet of paper.
144. Which unit of length is smaller: decimeter or kilometer?
ⓐ. Decimeter
ⓑ. Kilometer
ⓒ. They are equal
ⓓ. It depends on the context
Correct Answer: Decimeter
Explanation: A decimeter (dm) is smaller than a kilometer (km). 1 kilometer equals 10,000 decimeters. Decimeters are rarely used for long distances and are more commonly used for shorter measurements in practical applications.
145. Which unit of length is commonly used to express the diameter of a coin?
ⓐ. Millimeter
ⓑ. Kilometer
ⓒ. Centimeter
ⓓ. Decimeter
Correct Answer: Millimeter
Explanation: The diameter of a coin is commonly expressed in millimeters (mm). Millimeters provide a convenient and precise measurement for small objects like coins, where accuracy in size is important for manufacturing and collecting purposes.
146. Which unit of length is used to measure the height of a tall building?
ⓐ. Kilometer
ⓑ. Centimeter
ⓒ. Meter
ⓓ. Millimeter
Correct Answer: Meter
Explanation: The height of a tall building is typically measured in meters (m). Meters strike a balance between being precise enough for architectural and construction purposes while still providing manageable numbers for everyday use and communication.
147. Which unit of length is equivalent to \(10^{-3}\) meters?
ⓐ. Centimeter
ⓑ. Millimeter
ⓒ. Decimeter
ⓓ. Micrometer
Correct Answer: Millimeter
Explanation: 1 millimeter (mm) is equal to \(10^{-3}\) meters (m). Millimeters are commonly used to measure small distances such as the thickness of paper or the diameter of small objects.
148. Which unit of length is larger: meter or centimeter?
ⓐ. Meter
ⓑ. Centimeter
ⓒ. They are equal
ⓓ. It depends on the context
Correct Answer: Meter
Explanation: A meter (m) is larger than a centimeter (cm). 1 meter equals 100 centimeters. Meters are frequently used for measuring longer distances, such as the length of a room or the height of a person.
149. Which unit of length is commonly used to describe the width of a book?
ⓐ. Millimeter
ⓑ. Kilometer
ⓒ. Meter
ⓓ. Centimeter
Correct Answer: Centimeter
Explanation: The width of a book is commonly described in centimeters (cm). Centimeters provide a suitable level of detail for measuring the dimensions of books, which are typically smaller in size compared to larger objects or distances.
150. Which unit of length is equivalent to 10 decimeters?
ⓐ. Centimeter
ⓑ. Meter
ⓒ. Kilometer
ⓓ. Millimeter
Correct Answer: Meter
Explanation: 1 decimeter (dm) is equivalent to 0.1 meters (m). Therefore, 10 decimeters equal 1 meter. Decimeters are rarely used independently but are occasionally used for smaller measurements where precision beyond centimeters is required.
151. Which measuring tool is most suitable for measuring the thickness of a sheet of metal?
ⓐ. Vernier calipers
ⓑ. Micrometer screw gauge
ⓒ. Ruler
ⓓ. Measuring tape
Correct Answer: Micrometer screw gauge
Explanation: A micrometer screw gauge is the most suitable tool for measuring the thickness of a sheet of metal due to its high precision and ability to measure small dimensions accurately.
152. Which measuring tool is commonly used to measure the length of a curved object?
ⓐ. Ruler
ⓑ. Measuring tape
ⓒ. Vernier calipers
ⓓ. Micrometer screw gauge
Correct Answer: Measuring tape
Explanation: A flexible tape (or string-then-ruler method) conforms to curves; rigid tools don’t trace long curves well.
153. Which measuring tool is ideal for measuring the diameter of a small cylindrical object?
ⓐ. Measuring tape
ⓑ. Micrometer screw gauge
ⓒ. Ruler
ⓓ. Vernier calipers
Correct Answer: Vernier calipers
Explanation: Vernier calipers are ideal for measuring the diameter of a small cylindrical object because they provide precise measurements of both internal and external dimensions, including diameters.
154. Which measuring tool is best suited for measuring the length of a large object like a room?
ⓐ. Micrometer screw gauge
ⓑ. Vernier calipers
ⓒ. Ruler
ⓓ. Measuring tape
Correct Answer: Measuring tape
Explanation: A measuring tape is best suited for measuring the length of large objects like rooms due to its flexibility, durability, and ability to measure long distances accurately.
155. Which measuring tool is used to measure very small distances with high precision, such as the thickness of a wire?
ⓐ. Measuring tape
ⓑ. Micrometer screw gauge
ⓒ. Ruler
ⓓ. Vernier calipers
Correct Answer: Micrometer screw gauge
Explanation: A micrometer screw gauge is used to measure very small distances with high precision, such as the thickness of a wire or the diameter of small components.
156. Which measuring tool is suitable for measuring the length of a straight object with markings in millimeters?
ⓐ. Vernier calipers
ⓑ. Ruler
ⓒ. Measuring tape
ⓓ. Micrometer screw gauge
Correct Answer: Ruler
Explanation: A ruler is suitable for measuring the length of a straight object with markings in millimeters. It provides a quick and straightforward measurement for lengths up to the length of the ruler itself.
157. Which measuring tool is commonly used in engineering workshops for precise measurements of machine parts?
ⓐ. Measuring tape
ⓑ. Micrometer screw gauge
ⓒ. Vernier calipers
ⓓ. Ruler
Correct Answer: Vernier calipers
Explanation: Vernier calipers are commonly used in engineering workshops for precise measurements of machine parts due to their ability to measure both internal and external dimensions accurately.
158. Which measuring tool is used for rough measurements of lengths in construction?
ⓐ. Vernier calipers
ⓑ. Micrometer screw gauge
ⓒ. Ruler
ⓓ. Measuring tape
Correct Answer: Measuring tape
Explanation: A measuring tape is used for rough measurements of lengths in construction due to its flexibility and ease of use over longer distances.
159. Which measuring tool is suitable for measuring the depth of a hole in a metal block?
ⓐ. Ruler
ⓑ. Vernier calipers
ⓒ. Measuring tape
ⓓ. Micrometer screw gauge
Correct Answer: Vernier calipers
Explanation: Vernier calipers are suitable for measuring the depth of a hole in a metal block because they can measure internal dimensions accurately, including depths.
160. Which measuring tool is used for measuring distances both horizontally and vertically in surveying?
ⓐ. Micrometer screw gauge
ⓑ. Vernier calipers
ⓒ. Ruler
ⓓ. Measuring tape
Correct Answer: Measuring tape
Explanation: A measuring tape is used for measuring distances both horizontally and vertically in surveying due to its versatility and ability to measure long distances accurately.
161. Which measuring tool is commonly used in carpentry for measuring and marking lengths?
ⓐ. Vernier calipers
ⓑ. Measuring tape
ⓒ. Micrometer screw gauge
ⓓ. Ruler
Correct Answer: Measuring tape
Explanation: Measuring tapes are commonly used in carpentry for their flexibility and durability, allowing carpenters to measure and mark lengths accurately.
162. Which measuring tool is best suited for measuring the thickness of a book?
ⓐ. Vernier calipers
ⓑ. Ruler
ⓒ. Measuring tape
ⓓ. Micrometer screw gauge
Correct Answer: Ruler
Explanation: A ruler is best suited for measuring the thickness of a book due to its flat edge and clear markings, providing a straightforward measurement.
163. Which measuring tool is ideal for measuring the diameter of a pipe?
ⓐ. Micrometer screw gauge
ⓑ. Measuring tape
ⓒ. Ruler
ⓓ. Vernier calipers
Correct Answer: Vernier calipers
Explanation: Vernier calipers are ideal for measuring the diameter of a pipe due to their ability to measure external dimensions accurately, including diameters.
164. Which measuring tool is commonly used in tailoring for measuring lengths of fabric?
ⓐ. Measuring tape
ⓑ. Ruler
ⓒ. Micrometer screw gauge
ⓓ. Vernier calipers
Correct Answer: Measuring tape
Explanation: Measuring tapes are commonly used in tailoring for their flexibility and ease of measuring lengths of fabric accurately.
165. Which measuring tool is suitable for measuring the thickness of a sheet of paper?
ⓐ. Ruler
ⓑ. Vernier calipers
ⓒ. Measuring tape
ⓓ. Micrometer screw gauge
Correct Answer: Micrometer screw gauge
Explanation: Single-sheet thickness is best resolved by a micrometer (or measure many sheets with calipers and divide).
166. Which measuring tool is used in scientific laboratories for precise measurements of small objects?
ⓐ. Vernier calipers
ⓑ. Measuring tape
ⓒ. Ruler
ⓓ. Micrometer screw gauge
Correct Answer: Vernier calipers
Explanation: Vernier calipers are used in scientific laboratories for their precision in measuring small objects, including lengths, diameters, and thicknesses.
167. Which measuring tool is commonly used by machinists for measuring the thickness of metal sheets?
ⓐ. Ruler
ⓑ. Measuring tape
ⓒ. Vernier calipers
ⓓ. Micrometer screw gauge
Correct Answer: Micrometer screw gauge
Explanation: Micrometer screw gauges are commonly used by machinists for their high precision in measuring the thickness of metal sheets and other small components.
168. Which measuring tool is suitable for measuring the height of a plant in the garden?
ⓐ. Micrometer screw gauge
ⓑ. Measuring tape
ⓒ. Vernier calipers
ⓓ. Ruler
Correct Answer: Measuring tape
Explanation: A measuring tape is suitable for measuring the height of a plant in the garden due to its flexibility and ability to measure longer distances accurately.
169. Which measuring tool is used by jewelers for measuring the diameter of gemstones?
ⓐ. Measuring tape
ⓑ. Ruler
ⓒ. Micrometer screw gauge
ⓓ. Vernier calipers
Correct Answer: Vernier calipers
Explanation: Vernier calipers are used by jewelers for their accuracy in measuring small dimensions such as the diameter of gemstones.
170. Which measuring tool is commonly used in quality control for measuring the thickness of plastic film?
ⓐ. Ruler
ⓑ. Vernier calipers
ⓒ. Micrometer screw gauge
ⓓ. Measuring tape
Correct Answer: Micrometer screw gauge
Explanation: Micrometer screw gauges are commonly used in quality control for their precise measurements of the thickness of plastic film and other thin materials.
171. Which technique for measuring large distances involves using the apparent shift in the position of an object viewed from two different points?
ⓐ. Triangulation
ⓑ. Parallax method
ⓒ. Radar ranging
ⓓ. Laser ranging
Correct Answer: Parallax method
Explanation: The parallax method involves measuring large distances by observing the apparent shift in the position of an object when viewed from two different points, such as observing a star from opposite points on Earth’s orbit.
172. Which technique for measuring large distances relies on the principle of measuring the angles of a triangle formed by observing distant objects?
ⓐ. Radar ranging
ⓑ. Parallax method
ⓒ. Laser ranging
ⓓ. Triangulation
Correct Answer: Triangulation
Explanation: Triangulation is a technique for measuring large distances that relies on measuring the angles of a triangle formed by observing distant objects from two separate locations, such as in land surveying or satellite positioning.
173. Which technique for measuring large distances uses radio waves to determine the distance to an object?
ⓐ. Parallax method
ⓑ. Radar ranging
ⓒ. Triangulation
ⓓ. Laser ranging
Correct Answer: Radar ranging
Explanation: Radar ranging uses radio waves to determine the distance to an object by measuring the time it takes for radio waves to reflect off the object and return to the source, commonly used in aviation and weather forecasting.
174. Which technique for measuring large distances involves bouncing light pulses off a target and measuring the time it takes for the pulses to return?
ⓐ. Laser ranging
ⓑ. Triangulation
ⓒ. Parallax method
ⓓ. Radar ranging
Correct Answer: Laser ranging
Explanation: Laser ranging involves bouncing light pulses (lasers) off a target and measuring the time it takes for the pulses to return, allowing precise measurement of distances to satellites, the Moon, and other celestial bodies.
175. Which technique for measuring large distances is commonly used in astronomy to measure distances to stars and galaxies?
ⓐ. Radar ranging
ⓑ. Laser ranging
ⓒ. Parallax method
ⓓ. Triangulation
Correct Answer: Parallax method
Explanation: The parallax method is commonly used in astronomy to measure large distances to stars and galaxies by observing the apparent shift in their positions when viewed from opposite points in Earth’s orbit.
176. Which technique for measuring large distances involves measuring the time delay between the transmission and reception of a signal bounced off a distant object?
ⓐ. Triangulation
ⓑ. Radar ranging
ⓒ. Laser ranging
ⓓ. Parallax method
Correct Answer: Radar ranging
Explanation: Radar ranging measures large distances by calculating the time delay between the transmission and reception of radio waves bounced off a distant object, widely used in navigation and remote sensing.
177. Which technique for measuring large distances is based on measuring the angles between a baseline and the lines of sight to distant objects?
ⓐ. Parallax method
ⓑ. Triangulation
ⓒ. Laser ranging
ⓓ. Radar ranging
Correct Answer: Triangulation
Explanation: Triangulation measures large distances by calculating angles between a baseline (the distance between observation points) and lines of sight to distant objects, used in surveying, satellite navigation, and mapping.
178. Which technique for measuring large distances is most suitable for measuring the distance to a nearby star?
ⓐ. Laser ranging
ⓑ. Parallax method
ⓒ. Radar ranging
ⓓ. Triangulation
Correct Answer: Parallax method
Explanation: The parallax method is most suitable for measuring the distance to a nearby star by observing its apparent shift when viewed from opposite points in Earth’s orbit, providing a baseline for calculating distance.
179. Which technique for measuring large distances requires precise time measurement to calculate the distance to a reflecting object?
ⓐ. Radar ranging
ⓑ. Laser ranging
ⓒ. Triangulation
ⓓ. Parallax method
Correct Answer: Laser ranging
Explanation: Laser ranging requires precise time measurement to calculate distances by measuring the time it takes for laser pulses to reflect off a distant object and return, used in space missions and satellite positioning.
180. Which technique for measuring large distances involves using sound waves to determine the distance to an object?
ⓐ. Sonar
ⓑ. Laser ranging
ⓒ. Radar ranging
ⓓ. Parallax method
Correct Answer: Sonar
Explanation: Sonar uses sound waves to measure distances to objects underwater or in air by calculating the time delay between sending and receiving sound pulses, commonly used in marine navigation and underwater exploration.
181. Which technique for measuring large distances involves bouncing sound waves off a target and measuring the time it takes for the waves to return?
ⓐ. Sonar
ⓑ. Laser ranging
ⓒ. Radar ranging
ⓓ. Parallax method
Correct Answer: Sonar
Explanation: Sonar involves bouncing sound waves off a target and measuring the time it takes for the waves to return, used in applications such as underwater mapping and fish detection.
182. Which technique for measuring large distances is commonly used in cartography and geodesy for accurate mapping?
ⓐ. Radar ranging
ⓑ. Laser ranging
ⓒ. Triangulation
ⓓ. Parallax method
Correct Answer: Triangulation
Explanation: Triangulation is commonly used in cartography and geodesy for accurate mapping by measuring angles between known points and distant objects, ensuring precise positioning and mapping.
183. Which technique for measuring large distances involves using a laser beam to determine the distance to a target?
ⓐ. Sonar
ⓑ. Radar ranging
ⓒ. Triangulation
ⓓ. Laser ranging
Correct Answer: Laser ranging
Explanation: Laser ranging involves using a laser beam to determine the distance to a target by measuring the time it takes for the laser pulses to reflect off the target and return, used in astronomy and satellite positioning.
184. Which technique for measuring large distances relies on measuring the time delay between sending and receiving radio waves bounced off a distant object?
ⓐ. Laser ranging
ⓑ. Triangulation
ⓒ. Radar ranging
ⓓ. Parallax method
Correct Answer: Radar ranging
Explanation: Radar ranging relies on measuring the time delay between sending and receiving radio waves bounced off a distant object to calculate distances accurately, used in aviation and meteorology.
185. Which technique for measuring large distances is suitable for determining the height of mountains and valleys from a satellite?
ⓐ. Sonar
ⓑ. Laser ranging
ⓒ. Radar ranging
ⓓ. Parallax method
Correct Answer: Laser ranging
Explanation: Laser ranging is suitable for determining the height of mountains and valleys from a satellite by accurately measuring distances using laser pulses reflected off Earth’s surface.
186. Which technique for measuring large distances involves using GPS satellites to determine the position and distance on Earth’s surface?
ⓐ. Sonar
ⓑ. Radar ranging
ⓒ. Trilateration
ⓓ. Triangulation
Correct Answer: Trilateration
Explanation: GPS uses distances (ranges) to satellites → trilateration, not angle-based triangulation.
187. Which technique for measuring large distances is commonly used in astronomy to measure the distances to stars and galaxies?
ⓐ. Radar ranging
ⓑ. Laser ranging
ⓒ. Parallax method
ⓓ. Triangulation
Correct Answer: Parallax method
Explanation: The parallax method is commonly used in astronomy to measure the distances to stars and galaxies by observing their apparent shift when viewed from different points in Earth’s orbit.
188. Which technique for measuring large distances involves measuring the angles between a baseline and lines of sight to determine the distance to a target?
ⓐ. Radar ranging
ⓑ. Parallax method
ⓒ. Laser ranging
ⓓ. Triangulation
Correct Answer: Triangulation
Explanation: Triangulation involves measuring angles between a baseline (distance between observation points) and lines of sight to determine the distance to a target, used in surveying and navigation.
189. Which technique for measuring large distances is suitable for measuring the height of buildings and structures from ground level?
ⓐ. Laser ranging
ⓑ. Radar ranging
ⓒ. Sonar
ⓓ. Triangulation
Correct Answer: Laser ranging
Explanation: Laser ranging is suitable for measuring the height of buildings and structures from ground level by bouncing laser pulses off the top of the structure and measuring the time it takes for the pulses to return.
190. Which technique for measuring large distances is used in meteorology for measuring the distance and direction of storm cells?
ⓐ. Triangulation
ⓑ. Radar ranging
ⓒ. Parallax method
ⓓ. Laser ranging
Correct Answer: Radar ranging
Explanation: Radar ranging is used in meteorology for measuring the distance and direction of storm cells by sending and receiving radio waves bounced off precipitation particles in the atmosphere.
191. Which instrument is used to measure the height variations and surface roughness of materials at the atomic level?
ⓐ. Electron microscope
ⓑ. Atomic force microscope
ⓒ. Laser interferometer
ⓓ. Scanning tunneling microscope
Correct Answer: Atomic force microscope
Explanation: An atomic force microscope is used to measure height variations and surface roughness of materials at the atomic level by scanning a sharp probe over the surface and detecting atomic forces.
192. Which instrument is used to produce high-resolution images of the surface of materials using a beam of electrons?
ⓐ. Atomic force microscope
ⓑ. Laser interferometer
ⓒ. Scanning electron microscope
ⓓ. Tunneling electron microscope
Correct Answer: Scanning electron microscope
Explanation: A scanning electron microscope produces high-resolution images of material surfaces using a beam of electrons scanned across the specimen’s surface, enabling detailed surface analysis.
193. Which instrument is used to measure distances at the atomic scale by measuring the tunneling current between a sharp tip and the sample surface?
ⓐ. Atomic force microscope
ⓑ. Laser interferometer
ⓒ. Scanning tunneling microscope
ⓓ. Electron microscope
Correct Answer: Scanning tunneling microscope
Explanation: A scanning tunneling microscope measures distances at the atomic scale by detecting the tunneling current between a sharp tip and the sample surface, providing precise atomic-level measurements.
194. Which instrument is used to measure the precise distance changes in an interferometer setup for highly accurate length measurements?
ⓐ. Electron microscope
ⓑ. Laser interferometer
ⓒ. Atomic force microscope
ⓓ. Scanning tunneling microscope
Correct Answer: Laser interferometer
Explanation: A laser interferometer measures precise distance changes in an interferometer setup using laser light interference patterns, enabling highly accurate length measurements.
195. Which instrument is used to observe the arrangement and movement of atoms on a material’s surface?
ⓐ. Scanning electron microscope
ⓑ. Laser interferometer
ⓒ. Scanning tunneling microscope
ⓓ. Atomic force microscope
Correct Answer: Scanning tunneling microscope
Explanation: A scanning tunneling microscope observes the arrangement and movement of atoms on a material’s surface by scanning a sharp tip close to the surface and measuring tunneling current.
196. Which instrument is used to study the detailed structure and composition of materials by scanning a focused beam of electrons over the sample surface?
ⓐ. Atomic force microscope
ⓑ. Scanning electron microscope
ⓒ. Scanning tunneling microscope
ⓓ. Laser interferometer
Correct Answer: Scanning electron microscope
Explanation: A scanning electron microscope studies the detailed structure and composition of materials by scanning a focused beam of electrons over the sample surface, producing high-resolution images.
197. Which instrument is used to measure surface forces and interactions at the nanoscale by scanning a sharp tip over the sample surface?
ⓐ. Scanning tunneling microscope
ⓑ. Atomic force microscope
ⓒ. Laser interferometer
ⓓ. Electron microscope
Correct Answer: Atomic force microscope
Explanation: An atomic force microscope measures surface forces and interactions at the nanoscale by scanning a sharp tip over the sample surface and detecting atomic forces.
198. Which instrument is used to measure the exact distance changes between two points with minimal interference from external factors?
ⓐ. Scanning tunneling microscope
ⓑ. Laser interferometer
ⓒ. Scanning electron microscope
ⓓ. Atomic force microscope
Correct Answer: Laser interferometer
Explanation: A laser interferometer measures exact distance changes between two points with minimal interference from external factors using laser light interference patterns.
199. Which instrument is used to investigate the surface topography and properties of materials at atomic resolution?
ⓐ. Scanning electron microscope
ⓑ. Atomic force microscope
ⓒ. Laser interferometer
ⓓ. Scanning tunneling microscope
Correct Answer: Scanning tunneling microscope
Explanation: A scanning tunneling microscope investigates the surface topography and properties of materials at atomic resolution by scanning a sharp tip close to the surface and measuring tunneling current.
200. Which instrument is used to measure the dimensions and alignment of very small structures in integrated circuits and microdevices?
ⓐ. Scanning tunneling microscope
ⓑ. Laser interferometer
ⓒ. Atomic force microscope
ⓓ. Electron microscope
Correct Answer: Electron microscope
Explanation: An electron microscope measures the dimensions and alignment of very small structures in integrated circuits and microdevices by scanning a focused beam of electrons over the sample surface, providing detailed images and measurements.
The chapter Units and Measurements in Class 11 Physics (NCERT/CBSE syllabus) is one of the most essential building blocks of Physics. It explains how quantities are measured, how accuracy and precision are defined, and the role of errors, significant figures, and dimensional analysis in Physics. These topics are not only crucial for Class 11 and 12 board exams but are also heavily tested in competitive exams like JEE, NEET, and state-level entrance tests. With a complete set of 398 MCQs with answers divided into 4 parts, this collection ensures systematic coverage of all important concepts. In this second part, you will practice another 100 multiple-choice questions that emphasize problem-solving skills, error calculations, and dimensional consistency checks.
- 👉 Total MCQs in this chapter: 398.
- 👉 This page contains: Second set of 100 solved MCQs with answers.
- 👉 Focuses on errors, significant figures, and dimensional analysis.
- 👉 Ideal for board exam practice and competitive tests like JEE/NEET.
- 👉 To continue to other parts or explore more chapters, use the navigation buttons above the MCQs.