Test: Measurement of Length (NCERT) - NEET MCQ

# Test: Measurement of Length (NCERT) - NEET MCQ

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## 20 Questions MCQ Test Physics Class 11 - Test: Measurement of Length (NCERT)

Test: Measurement of Length (NCERT) for NEET 2024 is part of Physics Class 11 preparation. The Test: Measurement of Length (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Measurement of Length (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Measurement of Length (NCERT) below.
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Test: Measurement of Length (NCERT) - Question 1

### Fathom is the unit to measure the

Detailed Solution for Test: Measurement of Length (NCERT) - Question 1

Fathom is a unit of length equal to six feet. It is used to measure depth of sea.

Test: Measurement of Length (NCERT) - Question 2

### Which of the following is not unit of length?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 2

Angstrom, femi and parsec are the units of length whereas barn is the unit of nuclear cross-section.

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Test: Measurement of Length (NCERT) - Question 3

### Match the Column I with Column II.

Detailed Solution for Test: Measurement of Length (NCERT) - Question 3

A. Distance between earth and sun - Light year
B. Interatomic distance in a solid - Angstrom
C. Size of a nucleus - Fermi
D. Wavelength of infrared laser - Micron

Test: Measurement of Length (NCERT) - Question 4

Which of the Following is the smallest unit?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 4

1 mm = 10-3m; 1 Å = 10-10m; 1 fm = 10-15m
Among the given units fermi is the smallest unit.

Test: Measurement of Length (NCERT) - Question 5

Which one of the following instruments is not used for the measurement of length?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 5

Vernier callipers, screw gauge and spherometer are used for the measurement of length whereas atomic clock is used for the measurement of time.

Test: Measurement of Length (NCERT) - Question 6

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 cover this distance?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 6

Here, Speed of light in vacuum, c = 1 new unit of length s-1
Time taken by light of sun to reach the earth
t = 8 min and 20 seconds = (8 x 60 + 20) s = 500 s
∴ Distance between the sun and the earth
S = ct = 1 new unit of length s-1 x 500 s
= 500 new unit of length

Test: Measurement of Length (NCERT) - Question 7

Light year is

Detailed Solution for Test: Measurement of Length (NCERT) - Question 7

Light year is the distance travelled by light in free space in one year.

Test: Measurement of Length (NCERT) - Question 8

Light year is the unit of

Detailed Solution for Test: Measurement of Length (NCERT) - Question 8

1 light year = 9.46 x 1015 m
(Distance travelled by light in 1 year)

Test: Measurement of Length (NCERT) - Question 9

How many light years Alpha Centauri away from the Earth?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 9

Alpha centauri is 4.29 light years away from the earth.

Test: Measurement of Length (NCERT) - Question 10

Which one of the following methods is used to measure distance of a planet or a star from the earth?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 10

Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.

Test: Measurement of Length (NCERT) - Question 11

Which of the following properties of laser beam can be used to measure long distances?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 11

A laser is a source of very intense, monochromatic and undirectional beam of light .These properties of laser light can be exploited to measure long distances.

Test: Measurement of Length (NCERT) - Question 12

The distance of the moon from the earth is about 60 times the radius of the earth. What will be diameter of the earth (approximately in degrees) as seen from the moon?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 12

From figure,

∴ Diameter of the earth as seen from the moon is about 2.

Test: Measurement of Length (NCERT) - Question 13

The Sun's angular diameter is measured to be 1920". The distance of the sun from the earth is 1.496 × 1011m. What is the diameter of the sun?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 13

Here,
Distance of the sun from the earth, d = 1.496 × 1011m
Suns angular diameter, α = 192′′
∵ 1′′ = 4.85 × 10−6 rad
∴ α = 1920 × 4.85 × 10−6 rad
= 9.31 × 10−3 rad
Suns diameter, D = αd
D = (9.31 × 10−3)(1.496 × 1011)m
= 1.39 × 109m

Test: Measurement of Length (NCERT) - Question 14

What is the length of the arc of a circle of radius 30 cm which subtend an angle π/6 at the centre?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 14

Here, θ = π/6, r = 30 cm

Test: Measurement of Length (NCERT) - Question 15

The order of magnitude of the diameter of the earth is (Diameter of the earth is 1.28 x 107 m)

Detailed Solution for Test: Measurement of Length (NCERT) - Question 15

The order of magnitude of the diameter of the earth is 7.

Test: Measurement of Length (NCERT) - Question 16

How many wavelengths of Kr36 are there in one metre?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 16

The number of wavelength of Kr86 in 1 m is 1650763.73

Test: Measurement of Length (NCERT) - Question 17

The ratio of molar volume to atomic volume for 1 mole of hydrogen is (Take size of hydrogen molecule to be 1 Å)

Detailed Solution for Test: Measurement of Length (NCERT) - Question 17

Volume occupied by 1 mole of an ideal gas at STP is known as molar volume.
∴ Molar volume = 22.4 litre = 22.4 x 10-3 m3
Radius of hydrogen atom is r = 0.5 Å = 0.5 x 10-10 m

= 3.15 x 10-7 m3
Their corresponding ratio is

Test: Measurement of Length (NCERT) - Question 18

If the size of bacter ia is 1 micron, what will be the number of it in 1 m length?

Detailed Solution for Test: Measurement of Length (NCERT) - Question 18

1 micron = 10-6 m
∵ 10-6 m space is occupied by 1 bacteria.
∴ 1 m space will be occupied by
106  bacteria = 1 million bacteria

Test: Measurement of Length (NCERT) - Question 19

Astronomical unit (AU) is the distance between earth and the sun, 1 AU is equal to

Detailed Solution for Test: Measurement of Length (NCERT) - Question 19

1 AU  = 1.496 x 1011 m = 1.496 x 108 km

Test: Measurement of Length (NCERT) - Question 20

The ratio of the volume of the atom to the volume of the nucleus is of the order of

Detailed Solution for Test: Measurement of Length (NCERT) - Question 20

Radius of the atom, Ra = 1 Å = 10-10 m
Volume of the atom,

Radius of the nucleus, Rn = 1 fermi = 10−15m

Volume of the nucleus,

Their corresponding ratio is

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## Physics Class 11

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