Units and Measurements Test

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Units and Measurements Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

What is the dimension of (½)at²?

A
length/time² ([L]/[T²])

B
length/time([L]/[T])

C
time[T]

D
length [L]

Solution

½ a t² has the dimension of length since the dimension of acceleration is L/T² and multiplying it by T² leaves us with the dimension of length.
Question 2
1 / -0

Find the option with 5 significant figures

A
2.6008 cm

B
2.608 cm

C
26.08 mm

D
0.02608 m

Solution

26.008 have five significant figures where as 2.608 cm, 0.02608 m and 26.08 mm have four significant figures.
Question 3
1 / -0

The base units for length, mass and time in MKS system are:

A
m, kg, s

B
min, km, s

C
cm, kg, s

D
cm, g, s

Solution

It is m, kg, s.
Question 4
1 / -0

Angstrom is the unit of

A
Length

B
Light

C
Mass

D
Time

Solution

A^o is the unit of length.
Question 5
1 / -0

The numbers of significant figures in 1.84 x10^-27 kg are:

A
Four

B
Three

C
Five

D
Thirty

Solution

As the power of 10 is irrelevant to the determination of significant figures hence, the numbers of significant figures are 3 (1, 8 and 4).
Question 6
1 / -0

The most suitable instrument for measuring the size of an atom is.

A
Screw gauge

B
Electron microscope

C
Vernier calliper

D
Optical Microscope

Solution

Only electron microscope has resolution of 0.5-0.6 Angstrom which is less than the size of an atom.
Question 7
1 / -0

Random errors occur due to:

A
fluctuations in temperature, supply,error in reading

B
parallax

C
imperfect design of instruments

D
incorrect rounding off

Solution

They arise due to random and unpredictable fluctuations in experimental conditions (temperature, supply etc) and personal errors by the observer taking readings.
Question 8
1 / -0

A vernier calipers is used for measuring lengths to an accuracy of:

A
10^-1 m

B
10^-3 m

C
10^-4 m

D
10^-2m

Solution

A vernier calipers is used for measuring lengths to an accuracy of 10^-4m.
Question 9
1 / -0

The order of magnitude of a number expressed in scientific notation is

A
number of decimal places

B
number of digit before decimal

C
all digits in the number

D
power of ten

Solution

The order of magnitude of a number expressed in scientific notation is power of ten.

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Units and Measurements Test - 3

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Units and Measurements Test - 3

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Question 1

length/time2 ([L]/[T2])

length/time([L]/[T])

time[T]

length [L]

Solution

Question 2

2.6008 cm

2.608 cm

26.08 mm

0.02608 m

Solution

Question 3

m, kg, s

min, km, s

cm, kg, s

cm, g, s

Solution

Question 4

Length

Light

Mass

Time

Solution

Question 5

Four

Three

Five

Thirty

Solution

Question 6

Screw gauge

Electron microscope

Vernier calliper

Optical Microscope

Solution

Question 7

fluctuations in temperature, supply,error in reading

parallax

imperfect design of instruments

incorrect rounding off

Solution

Question 8

10-1 m

10-3 m

10-4 m

10-2m

Solution

Question 9

number of decimal places

number of digit before decimal

all digits in the number

power of ten

Solution

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length/time² ([L]/[T²])

10^-1 m

10^-3 m

10^-4 m

10^-2m