5. Pressure and Deformation in Solids

Q.10 Why do we need to consider significant digits in measurements?

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

Q.9 What precautions should be kept in mind while taking measurements using a measuring cylinder?

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

Q.8 How measuring cylinder is used to measure the volume of an irregularly shaped stone?

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

Q.7 Differentiate between Mechanical Stopwatch and Digital Stopwatch.

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

Q6. Screw gauge can give more precise length than vernier calipers. Briefly explain why?

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

Q5. Justify that displacement is a vector quantity while energy is a scalar quantity.

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

Q.4 Show that prefix micro is thousand times smaller than prefix milli.

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

Q.3 What base quantities are involved in these derived physical quantities; force, pressure, power and charge.

(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

Q.1 How does physics play an important role in our life?

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