Units and Measurements Test

Result

Units and Measurements Test - 10

Score
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out of -
Rank
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out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?

A
600

B
500

C
450

D
550

Solution

Distance between the Sun and the Earth = Speed of light × Time taken by light to cover the distance

Given that in the new unit,

speed of light = 1 unit

Time taken, t = 8 min 20 s = 500 s Distance between the Sun and the Earth = 1 x 500 = 500 units
Question 2
1 / -0

The number of significant digits in 0.007 is

A
3

B
3

C
4

D
2
Solution
There are three rules on determining how many significant figures are in a number:
- Non-zero digits are always significant.
- Any zeros between two significant digits are significant.
- A final zero or trailing zeros in the decimal portion ONLY are significant.
So keeping these rules in mind, there are 1 significant digit.
Question 3
1 / -0

The number of significant digits in 2.64 × 10²⁴ is

A
2

B
1

C
3

D
4
Solution
There are three rules on determining how many significant figures are in a number:
- Non-zero digits are always significant.
- Any zeros between two significant digits are significant.
- A final zero or trailing zeros in the decimal portion ONLY are significant.
So keeping these rules in mind, there are 3 significant digit.