## A physical quantity P is related to four observables a, b, c and d as follows: The percentage errors of measurement in a, b, c and d are 1%, 3%, 4% and 2%, respectively. What is the percentage error in the quantity P? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.13:- A physical quantity P is related to four observables a, b, c and d as follows: The percentage errors of measurement in a, b, c and d are 1%, 3%,…

## The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of the box, (b) the difference in the masses of the pieces to correct significant figures? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.12:- The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is…

## The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.11:- The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct…

## The photograph of a house occupies an area of 1.75 cm2on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55 m2. What is the linear magnification of the projector-screen arrangement? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.9:-  The photograph of a house occupies an area of 1.75 cm2on a 35 mm slide. The slide is projected on to a screen, and the area of the house…

## The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.8(c):- The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more…

## A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Do you think it is possible to increase the accuracy of the screw gauge arbitrarily by increasing the number of divisions on the circular scale? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.8(b):- A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Do you think it is possible to increase the accuracy of the screw gauge…

## You are given a thread and a metre scale. How will you estimate the diameter of the thread? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.8(a):- You are given a thread and a metre scale. How will you estimate the diameter of the thread?   Answer:- Wrap the thread on a uniform smooth rod in such…

## A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate on the thickness of hair? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-2 Units and Measurements

Q.7:- A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of…