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Round up the following upto three significant figures: 2808 - Chemistry

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प्रश्न

Round up the following upto three significant figures:

2808

एक शब्द/वाक्यांश उत्तर

उत्तर

2810

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अध्याय 1: Some Basic Concepts of Chemistry - EXERCISES [पृष्ठ २७]

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एनसीईआरटी Chemistry - Part 1 and 2 [English] Class 11
अध्याय 1 Some Basic Concepts of Chemistry
EXERCISES | Q 1.20 - (iv) | पृष्ठ २७

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संबंधित प्रश्न

What do you mean by significant figures?


How many significant figures are present in the 5005?


You are given a thread and a metre scale. How will you estimate the diameter of the thread?


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?


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?


A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s–1).


State the number of significant figures in the following:

0.007 m2


State the number of significant figures in the following:

0.0006032 m2


Solve the numerical example.

A large ball 2 m in radius is made up of a rope of square cross-section with edge length 4 mm. Neglecting the air gaps in the ball, what is the total length of the rope to the nearest order of magnitude?


Solve the numerical example.

Nuclear radius R has a dependence on the mass number (A) as R =1.3 × 10-16 A1/3 m. For a nucleus of mass number A = 125, obtain the order of magnitude of R expressed in the meter.


Solve the numerical example.

Write down the number of significant figures in the following: 0.003 m2, 0.1250 gm cm-2, 6.4 x 106 m, 1.6 x 10-19 C, 9.1 x 10-31 kg.


The radius of the circle is 3.12 m. Calculate the area of the circle with regard to significant figures.


Write the rules for determining significant figures.


Write a short note on the following.

Rounding - off


If the density of a solution is 3.12 g mL–1, the mass of 1.5 mL solution in significant figures is ______.


The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give ______.


Using the rules for significant figures, the correct answer for the expression `(0.02858 xx 0.112)/(0.5702)` will be ______.


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