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Look at the measurement of vernier calipers: a. What is its main scale reading? b. What is its coinciding division on the vernier scale? Calculate the total reading on the vernier calipers. Ans: a. The main scale reading (reading to which zero of vernier scale coincides) is 2.5 cm. … Read more
What is pitch and least count of: a. Vernier calipers if the smallest division on the main scale is 1 mm and total divisions on the vernier scale are 20. b. Screw gauge if the smallest division on its main scale is 0.5 mm and its movable scale has 50 divisions. Ans: a. The least … Read more
How many kilometers are there in 25 micrometers? Ans: As there are 103 meters in a kilometer and 10-6 meters in a micrometer, so 25 μm = 25 x 10-6 m = 25 x 10-6 x 10-3 km 25 μm = 25 x 10-9 km = 25 /10 x 10-9 x 101 km 25 μm … Read more
If a boy is 15 years 2 months and 10 days, convert his age in a. seconds b. milliseconds c. mega seconds Ans: A year has 12 months. Each month has 30 days. Every year has 365 days. A leap year that comes every four years has 366 days. As his age is 15 years … Read more
a. 27.5 x 10-10 m b. 0.00023 x 10-2 s Ans: a. 27.5 x 10-10 m We will convert the number first to scientific notation. For this purpose, we have to move the decimal to bring it in between 2 and 7. 27.5 x 10-10 m = 2.75 x 10+1 x 10-10 … Read more
a. 1234 m b. 0.000023 s c. 469.3 x 105 m d. 0.00985 x 107 s Ans: a. 1234 m The decimal should be between 1 and 2. So, we have to move 3 steps towards the left that’s why the power will be positive 3. The result will be: 1234 … Read more
Ans: Due to the vast scope and research in physics, it is usually divided into several branches some of them given below: Mechanics: Description: Motion of objects and how it relates to forces. Examples: falling objects, friction, weight, spinning objects Heat and Thermodynamics: Description: Heat and temperature their related to energy. Examples: melting and freezing … Read more
Ans: Physics: ‘Physics can be defined as the study of matter and energy’. Physics and Technology: Rockets and space shuttles, magnetically levitating trains, and microscopic robots that fight cancer cells in our bodies. All of these technologies, whether ordinary or exciting, are based on the principles of physics. Physics is behind every technology and plays … Read more
Ans: Differentiate between precision and accuracy. Precision Accuracy (i) Precision refers to the degree of consistency or reproducibility of measurements. (i) Accuracy refers to the degree of closeness between a measured value and the true or accepted value. (ii) A measurement is precise if repeated measurements under the same conditions yield similar results, regardless of … Read more
Ans: Random errors are unpredictable and uncontrollable errors that can happen irregularly. These errors can be caused by fluctuations in experimental conditions or imperfections in measuring instruments. Random errors can be reduced by increasing the number of measurements and using more precise measuring instruments. To minimize random errors, it is important to take repeated measurements … Read more