Showing posts with label class11-physics. Show all posts
Showing posts with label class11-physics. Show all posts

Thursday, 22 March 2012

Range of measurement (Class 11 - Physics - Ch2)

Click on the figure to go flash animation to see the range of order of length from 10-35 m (Planck length) to 1026m, size of visible universe.
courtesy nasa (http://apod.nasa.gov/apod/ap120312.html)
Q1: What is 0.000047 in scientific notation?
Answer: 4.7 x 10-5

Q2: Q: Students X, Y and Z were asked by their teacher to measure the volume of water in a beaker.
X wrote : 200; Y wrote : 200 mL and Z wrote : 200 Lm
Which one of these answers is correct?

Answer: The first one has no units. Therefore, we do not know what does it mean.
The third is also not correct because there is no unit like Lm.
The second one is the only correct answer because it denotes millilitre.

Q3: Convert 10 inches into meters.
Answer
: We know that 1 inch = 2.54 cm (centimeters)