JEE Questions for Physics Units And Measurements Quiz 12

Henry/ohm can be expressed in

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Second
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Coulomb
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Mho
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Metre

The SI unit of momentum is

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0%
2)
0%
0%

How many wavelength of Kr⁸⁶ are there in one metre?

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1553164.13
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1650763.73
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652189.63
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2348123.73

One million electron volt (1 MeV) is equal to

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105 eV
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106 eV
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104 eV
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107 eV

The unit of potential energy is

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g(cm/sec2)
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g(cm/sec)2
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g(cm2/sec)
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g(cm/sec)

Which of the following represents a volt?

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Joule/second
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Watt/ampere
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Watt/coulumb
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Coulomb/joule

What is the SI unit of permeability?

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Henry per metre
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Tesla metre per ampere
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Weber per ampere metre
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All of the above units are correct

Tesla is a unit for measuring

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Magnetic moment
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Magnetic induction
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Magnetic intensity
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Magnetic pole strength

Number of base SI unit is

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4
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7
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3
0%
5

1 kWh is equal to

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1000 W
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36 × 105 J
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1000 J
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3600 J

Unit of magnetic moment is

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Ampere – metre2
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Ampere – metre
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Weber – metre2
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Weber/metre

If the unit of mass, length and time are doubled, unit of angular momentum will be

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Doubled
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Tripled
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Quadrapled
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8 time the original value

Physics-Units and Measurements-93777.png

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1
0%
10
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0.1
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0.01

Which one of thee following pairs of quantities and their units is a proper match?

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Electric field-coulomb/m
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Magnetic flux-weber
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Power-farad
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Capacitance-henry

The unit of absolute permitivity is

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Fm(farad-meter)
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Fm–1
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Fm–2
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F (farad)
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None of these

match List-I with List-II and select the correct answer using the codes given below the lists
Physics-Units and Measurements-93779.png

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I – A, II – F, III – E, IV – D
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I – C, II – F, III – A, IV – B
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I – C, II – F, III – A, IV – E
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I – B, II – F, III – A, IV – C

Which relation = 4.18 joule

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1 calorie = 4.18 joule
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1Å = 10–10m
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1 Mev = 1.6 × 10–13 joule
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1 newton = 10–5 dyne

If x = at + bt², where x is the distance travelled by the body in kilometre while t is the time in second, then the units of b are

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km/s
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km–s
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km/s2
0%
km–s2

Physics-Units and Measurements-93782.png

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0%
2)
0%
0%

Which of the following quantity is expressed as force per unit area?

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Work
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Pressure
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Volume
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Area

Match List-I with List-II and select the correct answer by using the codes given below the lists
Physics-Units and Measurements-93788.png

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A – 5, B – 4, C – 2, D – 1
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A – 3, B – 2, C – 4, D – 1
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A – 5, B – 2, C – 4, D – 3
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A – 3, B – 4, C – 1, D – 2

Which is not a unit of electric field?

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NC–1
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Vm–1
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JC–1
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JC–1m–1

The correct value of 0^oC on the Kelvin scale is

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273.15 K
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272.85 K
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273 K
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273.2 K

Which of the following is a derived unit?

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Unit of mass
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Unit of length
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Unit of time
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Unit of volume

Dyne/cm² is not a unit of

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Pressure
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Stress
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Strain
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Young's modulus

A physical quantity is measured and its value is found to be nu where n = Numerical value and u = Unit. Then, which of the following relations is true?

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0%
2)
0%
0%

Which of the following is not the unit of energy?

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calorie
0%
Joule
0%
Electron volt
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Watt

Which one of the following is not a unit of young\'s modulus?

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Nm–1
0%
Nm–2
0%
Dyne cm–2
0%
Mega Pascal

One femtometre is equivalent to

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1015 m
0%
10–15 m
0%
10–12 m
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1012 m

The unit of L/R is (where L = Inductance and R = Resistance)

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Sec
0%
Sec–1
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Volt
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Ampere

Which is different from others by units?

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Phase difference
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Mechanical equivalent
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Loudness of sound
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Poisson's ratio

Which of the following relation is wrong?

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1 ampere × 1 ohm = 1 volt
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1 watt × 1 sec = 1 joule
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1 newton per coulomb = 1 volt per metre
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1 coulomb × 1 volt = 1 watt

Which one of the following units is not that of mutual inductance?

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Henry
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(Weber)–1
0%
ohm second
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Volt second (ampere)–1

Physics-Units and Measurements-93796.png

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0%
2)
0%
0%

Select the pair whose dimensions are same

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Pressure and stress
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Stress and strain
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Pressure and force
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Power and force

Write dimensional formula for the intensity of radiation.

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0%
2)
0%
0%

Which pair has the same dimensions?

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Work and power
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Density and relative density
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Momentum and impulse
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Stress and strain

Dimensional formula for latent heat is

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0%
2)
0%
0%

The Dimensional formula for angular momentum is

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0%
2)
0%
0%

The dimensional formula for the modulus of rigidity is

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0%
2)
0%
0%

The dimensional formula for impulse is same as the dimensional formula for

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Momentum
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Force
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Rate of change of momentum
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Torque

The dimensional formula for r.m.s (root mean square) velocity for

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0%
2)
0%
0%

Physics-Units and Measurements-93836.png

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0%
2)
0%
0%

If L denotes the inductance of an inductor through which a current i is flowing, the dimensions of Li² are

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0%
Not expressible in MLT
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0%

Of the following quantities, which one has dimensions different from the remaining three?

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Energy per unit volume
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Force per unit area
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Product of voltage and charge per unit volume
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Angular momentum per unit mass

A spherical body of mass m and radius is allowed to fall in a medium of viscosity η. The time in which the velocity of the body increases from zero to 0.63 times the terminal velocity (v) is called time constant (τ). Dimensionally τ can be represented by

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0%
2)
0%
0%
None of these

The frequency of vibration f of a mass m suspended from a spring of spring constant K is given by a relation of this type, f = Cm^xK^y; where C is dimensionless quantity. The value of x and y are

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0%
2)
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0%

A quantities A and B are related by the relation, m = A/B, where m is the linear density and A is the force. The dimension of B are of

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Pressure
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Work
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Latent heat
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None of these

The velocity of water waves v may depend upon their wavelength λ, the density of water ρ and the acceleration due to gravity g. Te method of dimensions gives the relation between these quantities as