JEE Questions for Physics Units And Measurements Quiz 6 - MCQExams.com

Faraday is the unit of
  • Charge
  • Emf
  • Mass
  • Energy
Young\'s modulus of a material has the same units as
  • Pressure
  • Strain
  • Compressibility
  • Force
Which of the following is the smallest unit?
  • Millimetre
  • Angstrom
  • Fermi
  • Metre
The units of modulus of rigidity are
  • N-m
  • N/m
  • N-m2
  • N/m2
Unit of impulse is
  • Newton
  • kg-m
  • kg-m/s
  • Joule
Which is not a unit of electric field ?
  • NC–1
  • Vm–1
  • JC–1
  • JC–1 m–1
\'Torr\' is the unit of
  • Pressure
  • Volume
  • Density
  • Flux
The SI unit of gravitational potential is
  • J
  • J-Kg–1
  • J-Kg
  • J-Kg–2
One femtometer is equivalent to
  • 1015 m
  • 10–15 m
  • 10–12 m
  • 1012 m
Length cannot be measured by
  • Fermi
  • Debye
  • Micron
  • Light year
1 a.m.u is equivalent to
  • 1.6 × 10–27 kg
  • 934 MeV
  • 1.6 × 10–24 gm
  • All of these
The surface tension of a liquid is 70 dyne/cm. In MKS system its value is
  • 70 N/m
  • 7 × 10–2 N/m
  • 7 × 103 N/m
  • 7 × 102 N/m
The SI unit of universal gas constant (R) is
  • Watt K–1 mol–1
  • Newton K–1 mol–1
  • Joule K–1 mol–1
  • Erg K–1 mol–1
What are the units of K = 1/ 4 πε0 ?
  • C2 N–1 m–2
  • Nm2C–2
  • Nm2C2
  • Unitless
The mean time period of second’s pendulum is 2.00s and mean absolute error in the time period is 0.05s. To express maximum estimate of error, the time period should be written as
  • (2.00 ± 0.01)s
  • (2.00 + 0.025)s
  • (2.00 ± 0.05)s
  • (2.00 ± 0.10)s
The percentage error in the above problem is
  • 7%
  • 5.95%
  • 8.94%
  • 9.85%
The unit of percentage error is
  • Same as that of physical quantity
  • Different from that of physical quantity
  • Percentage error is unit less
  • Errors have got their own units which are different from that of physical quantity measured
If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be
  • 8%
  • 2%
  • 4%
  • 6%
A thin copper wire of length l metre increases in length by 2% when heated through 10°C. What is the percentage increase in area when a square copper sheet of length l metre is heated through 10°C ?
  • 4%
  • 8%
  • 16%
  • None of these

Physics-Units and Measurements-93233.png
  • 5%
  • 7%
  • 5.2%
  • 5/2%
The period of oscillation of a simple pendulum in the experiment is recorded as 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s respectively. The average absolute error is
  • 0.1 s
  • 0.11 s
  • 0.01 s
  • 1.0 s
If L = 2.331 cm, B = 2.1 cm, then L + B =
  • 4.431 cm
  • 4.43 cm
  • 4.4 cm
  • 4 cm
The number of significant figures in all the given numbers 25.12,2009, 4.156 and 1.217 × 10–4 is
  • 1
  • 2
  • 3
  • 4
If the acceleration due to gravity is 10 ms–2 and the units of length and time are changed in kilometer and hour respectively, the numerical value of the acceleration is
  • 3,60,000
  • 72,000
  • 36,000
  • 1,29,600
Select the pair whose dimensions are same
  • Pressure and stress
  • Stress and strain
  • Pressure and force
  • Power and force

Physics-Units and Measurements-93238.png
  • Velocity
  • Momentum
  • Energy
  • Angular momentum
The dimensions of calorie are
  • ML2T–2
  • MLT–2
  • ML2T–1
  • ML2T–3
If C and R represent capacitance and resistance respectively, then the dimensions of RC are
  • M0L0T2
  • M0L0T
  • ML–1
  • None of these
Dimensional formula for volume elasticity is
  • M1L–2T–2
  • M1L–3T–2
  • M1L2T–2
  • M1L–1T–2
The dimensions of universal gravitational constant are
  • M–2L2T–2
  • M–1L3T–2
  • ML–1T–2
  • ML2T–2
The dimensional formula of angular velocity is
  • M0L0T–1
  • MLT–1
  • M0L0T1
  • ML0T–2
The dimensions of power are
  • M1L2T–3
  • M2L1T–2
  • M1L2T–1
  • M1L1T–2
The dimensional formula for r.m.s (root mean square) velocity is
  • M0LT–1
  • M0L0T–2
  • M0L0T–1
  • MLT–3
The dimensional formula for Planck\'s constant (h) is
  • ML–2T–3
  • ML2T–2
  • ML2T–1
  • ML–2T–2
Planck\'s constant has the dimensions (unit) of
  • Energy
  • Linear momentum
  • Work
  • Angular momentum
If L denotes the inductance of an inductor through which a current i is flowing, the dimensions of Li2 are
  • ML2T–2
  • Not expressible in MLT
  • MLT–2
  • M2L2T–2
The dimensions of coefficient of thermal conductivity is
  • ML2T–2K–1
  • MLT–3K–1
  • MLT–2K–1
  • MLT–3K
Which of the following quantities has the same dimensions as that of energy ?
  • Power
  • Force
  • Momentum
  • Work
Which one of the following does not have the same dimension ?
  • Work and energy
  • Angle and strain
  • Relative density and refractive index
  • Planck constant and energy
A small steel ball of radius r is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity η. After some time the velocity of the ball attains a constant value known as terminal velocity vT. The terminal velocity depends on (i) the mass of the ball m, (ii) η , (iii) r and (iv) acceleration due to gravity g. Which of the following relations is dimensionally correct ?

  • Physics-Units and Measurements-93248.png
  • 2)
    Physics-Units and Measurements-93249.png

  • Physics-Units and Measurements-93250.png

  • Physics-Units and Measurements-93251.png
Surface tension has the same dimensions as that of
  • Coefficient of viscosity
  • Impulse
  • Momentum
  • Spring constant
  • Frequency
The dimensions of CV2 matches with dimensions of
  • L2I
  • L2 I2
  • LI2
  • 1/LI
The Martians use force (F), acceleration (A) and time (T) as their fundamental physical quantities. The dimensions of length on Martians system are
  • FT2
  • F–1T2
  • F–1A2T–1
  • AT2

Physics-Units and Measurements-93256.png
  • Velocity
  • Time
  • Capacitance
  • Distance
An athletic coach told his team that muscle times speed equals power. What dimensions does he view for muscle ?
  • MLT–2
  • ML2T–2
  • MLT2
  • L
Dimensions of permeability are
  • A–2M1L1T–2
  • MLT–2
  • ML0T–1
  • A–1MLT2
The dimension of quantity (L/RCV) is
  • [A]
  • [A2]
  • [A–1]
  • None of these
The dimension of the ratio of angular to linear momentum is
  • M0L1T0
  • M1L1T–1
  • M1L2T–1
  • M–1L–1T–1
If velocity v, acceleration A and force F are chosen as fundamental quantities, then the dimensional formula of angular momentum in terms of v, A and F would be
  • FA–1v
  • Fv3 A–2
  • Fv2A–1
  • F2v2A–1
The dimensions of permittivity ε0 are
  • A2T2M–1L–3
  • A2T4M–1L–3
  • A–2T–4ML3
  • A2T–4M–1L–3
0:0:1


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