Header Ads
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 a box. What is (a) the total mass of a mass of the box, (b) the difference in the masses of the pieces to correct significant figures? NCERT Solution

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 a box. What is (a) the total mass of a mass of the box, (b) the difference in the masses of the pieces to correct significant figures?

Physics Q Phobia January 27, 2019

Read more
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. NCERT Solution

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.

Physics Q Phobia January 27, 2019

Read more
State the number of significant figures in the following: 0.007 m^2 (b) 2.64 x 10^24 kg (c) 0.2370 g cm^(-2) (d) 6.320 J (e) 6.032 N m^(-2) (f ) 0.0006032 m^2 NCERT Solution

State the number of significant figures in the following: 0.007 m^2 (b) 2.64 x 10^24 kg (c) 0.2370 g cm^(-2) (d) 6.320 J (e) 6.032 N m^(-2) (f ) 0.0006032 m^2

Physics Q Phobia January 25, 2019

Read more
The photograph of a house occupies an area of 1.75 cm2 on 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? NCERT Solution

The photograph of a house occupies an area of 1.75 cm2 on 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?

Physics Q Phobia January 25, 2019

Read more
Answer the following: (a) You are given a thread and a metre scale. How will you estimate the diameter of the thread? (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 arbitrarily by increasing the number of divisions on the circular scale? (c) The mean diameter of a thin brass rod is to be 2 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? NCERT Solution

Answer the following: (a) You are given a thread and a metre scale. How will you estimate the diameter of the thread? (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 arbitrarily by increasing the number of divisions on the circular scale? (c) The mean diameter of a thin brass rod is to be 2 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?

Physics Q Phobia January 25, 2019

Read more
A Student measure the thickness of a human hair by looking at it through a microscope of magnification 100.He measure 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 air? NCERT Solution

A Student measure the thickness of a human hair by looking at it through a microscope of magnification 100.He measure 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 air?

Physics Q Phobia January 25, 2019

Read more
Which of the following is the most precise device for measuring length? (a) A vernier callipers with 20 divisions on the sliding scale (b) A screw gauge of pitch 1 mm and 100 division’s sliding scale on the circular scale (c) An optical instrument that can measure length to within a wavelength of light NCERT Solution

Which of the following is the most precise device for measuring length? (a) A vernier callipers with 20 divisions on the sliding scale (b) A screw gauge of pitch 1 mm and 100 division’s sliding scale on the circular scale (c) An optical instrument that can measure length to within a wavelength of light

Physics Q Phobia January 25, 2019

Read more