FreeNotes
Ans: We need to consider significant digits in measurements to accurately convey the precision and reliability of the measured quantity. Significant digits help us understand the level of uncertainty associated with measurement, facilitate error analysis, ensure accurate mathematical operations, and enable clear communication of scientific findings. By paying attention to significant digits, we can convey … Read more
Ans: i. The measuring cylinder should be placed on a flat surface so that the upper surface of the water in the cylinder shows the same level. ii. The volume of the liquid should be read or the cylinder should be graduated from the base of the meniscus. Related Questions: Q.8 How measuring cylinder … Read more
Ans: A measuring cylinder can be used for measuring the volume of an irregular solid body such as a metallic bob as shown in the figure. When the object is completely immersed the volume of the water is read again. The volume of the object is found by subtracting the first reading from the second. … Read more
Ans: Differentiate between Mechanical Stopwatch and Digital Stopwatch. Mechanical Stopwatch Digital Stopwatch It has two circular dials. It has no dials but a screen. It has one knob which is used for It has two buttons. Pressing the left starting and stopping the stopwatch. By button starts the timer and long pressing this knob will … Read more
Ans: Screw gauges can give more precise lengths than vernier calipers because of the smaller least count of screw gauges. Explanation: The smaller the least count of an instrument, the more precise will be its reading. A typical screw gauge has a least count of 0.01 mm or 0.001 cm while a typical vernier caliper … Read more
Ans: Displacement is a vector quantity because it has both magnitude and direction. When an object moves from one position to another, its displacement is the straight-line distance between the initial and final positions, along with the direction from the starting point to the ending point. On the other hand, energy is a scalar quantity … Read more
Ans: To show that the prefix “micro” is a thousand times smaller than the prefix “milli”, we can look at the definitions of these prefixes according to the International System of Units (SI). The prefix “milli” (symbol: m) represents 10-3 or 1/1000 of a unit. The prefix “micro” (symbol: μ) represents 10-6 or 1/1000000 of … Read more
(a) Force: Force F = ma SI Unit of force is Newton (N) = kgms-2 Base quantities involved in force a mass, length, and time. (b) Pressure: Pressure = force/area Pressure = F/A The SI unit of force (F = ma) is Newton N = kgms and unit of area A is m² = kgm … Read more
Ans: Suppose my age = 15 years = 15 x 365 = 5475 days (1 year = 365 days) = 5475 x 24 = 131400 hours (1 day = 24 Hours) = 131400 x 60 = 7884000 minutes (1 hour = 60 Minutes) = 7884000 x 60 = 473040000 seconds … Read more
Ans: Physics in Science: Physics is the most fundamental of all the sciences. To study biology, chemistry, or any other natural science, one should have a firm understanding of physics principles. Example: For example, biology uses the physics principles of fluid movement to understand how the blood flows through the heart, arteries, and veins. Chemistry … Read more