JEE Questions for Physics Units And Measurements Quiz 15 - MCQExams.com


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A wire has a mass 0.3 ± 0.003 g, radius 0.5 ± 0.005 mm and length 6 ± 0.06 cm. The maximum percentage error in the measurement of its density is
  • 1
  • 2
  • 3
  • 4
Assertion: A.U is much bigger than Å
Reason: A.U. stands for astronomical unit and Å stands from Angstrom.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
A student uses a simple pendulum of exactly 1m length to determined, the acceleration due to gravity. He uses a stop watch with the least count of 1 sec for this and records 40 seconds for 20 oscillations. For this observation, which of the following statement(s) is (are) true?
  • Error ∆T in measuring T, the time period, is 0.05 seconds
  • Error & in measuring ∆T, the time period, is 1 second
  • Percentage error in the determination of g is 5%
  • Percentage error in the determination of g is 2.5%
The SI unit of inductance, the henry can be written as
a. Weber/ampere
b. Volt-sec/amp
c. Joule/(ampere)2
d. Ohm-second
  • a
  • b
  • c
  • All the above

Physics-Units and Measurements-94125.png
  • a and b
  • b and c
  • d only
  • None of these
The pair of physical quantities that have the same dimensions, is (are)
a. Reynolds number and coefficient of friction
b. Latent heat and gravitational potential
c. Curie and frequency of a light wave
d. Planck\'s constant and torque
  • a, b and c
  • c only
  • d only
  • a only

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  • b and d
  • d only
  • c only
  • a only
The dimensions of the quantities in one (or more) of the following pairs are the same. Identify the pair(s)
a. Torque and work
b. Angular momentum and work
c. Energy and Young;s modulus
d. Light year and wavelength
  • a and d
  • d only
  • a only
  • c only
Which of the following combination have the dimensions of time? L, C, R represent inductance capacitance and resistance respectively?
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  • a and d
  • d only
  • a only
  • c only
If L, C, R represent inductance, capacitance and resistance respectively, the combination having dimensions of frequency are
Physics-Units and Measurements-94132.png
  • a and c
  • a and d
  • a and b
  • a only
Some physical quantities are given in Column-I and some possible SI units in which these quantities may be expressed are given in column-II. Match the physical quantities in Column-I with the units in Column-II
Physics-Units and Measurements-94134.png
  • A → p, q; B → r, s; C → r, s; D → r, s
  • A → p; B → r; C → r; D → r, s
  • A → p, q; B → r; C → r, s; D → r, s
  • A → p, q; B → r, s; C → r; D → r, s
Column-I gives three physical quantities. Select the appropriate units for the choices given in Column-II. Some of the physical quantities may have more than one choice correct
Physics-Units and Measurements-94136.png
  • A → q, r; B → p, t; C → s
  • A → q; B → p, t; C → s
  • A → q, r; B → t; C → s
  • A → q; B → p; C → s

Physics-Units and Measurements-94138.png
  • A → v; B → w; C → r; D → q; E → r
  • A → v; B → q; C → r; D → w; E → r
  • A → w; B → v; C → r; D → q; E → r
  • A → v; B → w; C → r; D → q; E → w
Match the physical quantities given in Column - I with dimensions expressed in terms of mas (M), length (L), time (T) and charge (Q) given in Column - II
Physics-Units and Measurements-94140.png
  • A → q; B → p; C → s; D → u; E → r; F → t
  • A → p; B → q; C → s; D → u; E → r; F → t
  • A → q; B → p; C → u; D → s; E → r; F → t
  • A → q; B → p; C → s; D → u; E → t; F → r
Assertion: \'Light year\' and \'Wavelength\' both measure distance
Reason: Both have dimensions of time
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • I the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: The error in the measurement of radius of the sphere is 0.3%. The permissible error in its surface area is 0.6%
Physics-Units and Measurements-94141.png
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: Force cannot be added to pressure
Reason: Because their dimensions are different
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: Linear mass density has the dimensions of [M1L-1T0]
Reason: Because density is always mass per unit
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If the Assertion and Reason both are false
  • If the Assertion and Reason both are false If assertion is false but reason is true
Assertion: Avogadro number is the number of atoms in one gram mole
Reason: Avogadro number is a dimensionless constant
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true

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  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: Parallax method cannot be used for measuring distance of stars more than 100 light years away.
Reason: Because parallax angle reduces so much that it cannot be measured accurately
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: The graph between P and Q is straight line, when P/Q is constant.
Reason: The straight line graph means that P proportional to Q or P is equal to constant multiplied by Q.
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true
Assertion: Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.
Reason: In every measurement, only the last significant digit is not accurately known.
  • If both the Assertion an reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If assertion is true but reason is false
  • If the Assertion and Reason both are false
  • If assertion is false but reason is true

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  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Now a days a standard metre is defined in terms of wavelength of light.
Reason: Light has no relation with length.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true

Physics-Units and Measurements-94147.png
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Surface tension and surface energy have the same dimensions.
Reason: Because both have the same S.I unit
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true

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  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Dimensional constants are the quantities whose values are constant.
Reason: Dimensional constants are dimensionless.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When we change the unit of measurement of a quantity, its numerical value changes.
Reason: Smaller the unit of measurement smaller is its numerical value.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
The temperature of a body on Kelvin scale is found to be XK. When it is measured by a Fehrenheit thermometer, it is found to be X0F. Then, X is
  • 301.25
  • 574.25
  • 313
  • 40

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  • Both dimensionally and m=numerically correct
  • Neither numerically nor dimensionally correct
  • Dimensionaly correct only
  • Numerically correct only
A dimensionally consistent relation for the volume V of a liquid of coefficient of viscosity η flowing per second through a tube of radius r and length l ad having a pressure difference p across its end is

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    Physics-Units and Measurements-94157.png

  • Physics-Units and Measurements-94158.png

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  • 2)
    Physics-Units and Measurements-94163.png

  • Physics-Units and Measurements-94164.png

  • Physics-Units and Measurements-94165.png

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  • 2)
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The radius of the sphere is (5.3 ± 0.cm. Then, percentage error in its volume will be

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  • 2)
    Physics-Units and Measurements-94180.png

  • Physics-Units and Measurements-94181.png

  • Physics-Units and Measurements-94182.png
Assuming the mass of Earth as 6.64 × 1024 kg and the average mass of the atoms that make up Earth as 40u (atomic mass unit), the number of atoms in the Earth are approximately
  • 1030
  • 1040
  • 1050
  • 1060
Which of the following quantities has not been expressed in proper unit ?
Physics-Units and Measurements-94185.png
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
Which of the following pairs is wrong?
  • Pressure Barometer
  • Relative density-Pyrometer
  • Temperature-Thermometer
  • Earthquake-Seismograph

Physics-Units and Measurements-94186.png
  • a = L2, b =T, c = LT2
  • a = LT2, b = LT, c = L
  • a = LT–2, b = L, c = T
  • a = L, b = LT, c =T2
A physical parameter a can be determined by measuring the parameters b, c, d and e using the relation a = bα cβ / dγ eδ. If the maximum errors in the measurement of b, c,d and e are b1%, c1%, d1% and e1 %, then the maximum error in the value of a determined by the experiment is
  • (b1 + c1 + d1 + e1)%
  • (b1 + c1 – d1 – e1)%
  • (αb1 + βc1 – γd1 – δe1)%
  • (αb1 + βc1 + γd1 + δe1)%
A highly rigid cubical block A of small mass M and side L is fixed rigidly onto another cubical block B of the same dimensions and of low modulus of rigidity such that the lower face of A completely covers the upper face of B. The lower face of B is rigidly held on a horizontal surface. A small force F is applied perpendicular to one of the side faces of A. After the force is withdrawn, block A executes small oscillations. The time period of which is given by

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    Physics-Units and Measurements-94190.png

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If the time period (T) of vibration of a liquid drop depends on surface tension (S),

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  • 2)
    Physics-Units and Measurements-94195.png

  • Physics-Units and Measurements-94196.png
  • None of these
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