Assertion Linear mass density has the dimesions of [M 1 L –1 T 0 ]. Reason Because density is always mass per unit volume

If Assertion is true but Reason is false.

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 the Assertion and Reason both are false.

If Assertion is false but Reason is true.

JEE Questions for Physics Units And Measurements Quiz 7

Dimensions of CR are those of

0%
Frequency
0%
Energy
0%
Time period
0%
Current

The force F on a sphere of radius \'a\' moving in a medium with velocity \'v\' is given by F = 6 πηav. The dimensions of η are

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ML–1T–1
0%
MT–1
0%
MLT–2
0%
ML–3

The dimensions of inter atomic force constant are

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MT–2
0%
MLT–1
0%
MLT–2
0%
ML–1T–1

Dimensions of charge are

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M0L0T–1A–1
0%
MLTA–1
0%
T–1A
0%
TA

Dimension of electric current is

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[M0L0T–1Q]
0%
[ML2T–1Q]
0%
[M2LT–1Q]
0%
[M2L2T–1Q]

Which of the following pairs does not have similar dimensions?

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Stress and pressure
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Angle and strain
0%
Tension and surface tension
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Planck's constant and angular momentum

The dimensions of e.m.f in MKS is

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ML–1T–2Q–2
0%
ML2T–2Q–2
0%
MLT–2Q–1
0%
ML2T–2Q–1

Dimension of R is

0%
ML2T–1
0%
ML2T–3A–2
0%
ML–1T–2
0%
None of these

The dimensional formula of relative density is

0%
ML–3
0%
LT–1
0%
MLT–2
0%
Dimensionless

The dimensional formula for young\'s modulus is

0%
ML–1T–2
0%
M0LT–2
0%
MLT–2
0%
ML2T–2

The ratio of the dimension of Planck\'s constant and that of moment of inertia is the dimension of

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Frequency
0%
Velocity
0%
Angular momentum
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Time

The dimensions of shear modulus are

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MLT–1
0%
ML2T–2
0%
ML–1T–2
0%
MLT–2

Pressure gradient has the same dimension as that of

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Velocity gradient
0%
Potential gradient
0%
Energy gradient
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None of these

The dimensions of universal gas constant is

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[ML2T–2 θ–1]
0%
[M2LT–2 θ]
0%
[ML3T–1 θ–1]
0%
None of these

\ Pascal-Second\ has dimension of

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Force
0%
Energy
0%
Pressure
0%
Coefficient of viscosity

In a system of units if force (F), acceleration (A) and time (T) are taken as fundamental units then the dimensional formula of energy is

0%
FA2T
0%
FAT2
0%
F2AT
0%
FAT

If E, M, L and G denote energy, mass, angular momentum and gravitational constant respectively, then the quantity (EL² / M⁵G²) has the dimensions of

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Angle
0%
Length
0%
Mass
0%
Time

Assertion Linear mass density has the dimesions of [M¹ L^–1T⁰].
Reason Because density is always mass per unit volume

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If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
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If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false.
0%
If Assertion is false but Reason is true.

Match List I with List II and select the correct answer using the codes given below the lists.
Physics-Units and Measurements-93279.png

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P=3, Q=1, R=2, S=4
0%
P=3, Q=2, R=1, S=4
0%
P=4, Q=2, R=1, S=3
0%
P=4, Q=1, R=2, S=3

Physics-Units and Measurements-93281.png

0%
[ML5/2 T-2 ]
0%
[ML2 T-2 ]
0%
[M3/2L3/2 T-2 ]
0%
[M L7/2 T-2 ]

Maxwell is reponsible for

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Law of gravitation
0%
Unification of light and electromagnetism.
0%
Laws of electromagnetic induction
0%
Nuclear model of atom

Magnetic intensity is measured in

0%
Am-1
0%
tesla
0%
gauss
0%
weber

What are the units of magnetic permeability?

0%
Wb A-1m-1
0%
Wb-1A m
0%
Wb A m-1
0%
Wb A-1 m

The density of mercury in SI is

0%
1.36kg/cm3
0%
13.6kg/m3
0%
13.6 ×10–3 kg/m3
0%
13.6 ×103 kg/m3

The dimensional formula of wave number is

0%
0%
2)
0%
0%

If force, length and time would have been the fundamental units, what would have been the dimensional formula for mass?

0%
0%
2)
0%
0%
F

Physics-Units and Measurements-93296.png

0%
0%
2)
0%
0%

The units and dimensions of electric field intensity are

0%
0%
2)
0%
0%

The wavelength λ associated with a moving particle is given by λ= m^pυ^qh^r where m is mass, υ is velocity and h is Planck’s constant. The correct set of values of p, q, r is

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p =1, q =1, r =1
0%
p = –1, q = –1, r = –1
0%
p = –1, q = –1, r =1
0%
p =1, q = –1, r =1

Physics-Units and Measurements-93308.png

0%
0%
2)
0%
0%

The velocity of a body which has fallen under gravity varies as g^ah^b, where g is acc. due to gravity and h is the height. The values of a and b are

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a=1, b =1/2
0%
a= b=1
0%
a =1/2, b =1
0%
a=1/2;b =1/2

Dimensional formula for thermal conductivity is

0%
0%
2)
0%
0%

L²T^–2K^–1 are the dimensions of

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water equivalent
0%
specific heat
0%
thermal capacity
0%
entropy

Physics-Units and Measurements-93321.png

0%
work/time
0%
work × distance
0%
work/distance
0%
work × time

The dimensions of absolute electrical permittivity of free space are

0%
0%
2)
0%
0%

A force F is applied on a square plate of side L. If percentage error in determination of L is 2% and that in F is 4%, what is permissible error in pressure?

0%
2%
0%
4%
0%
6%
0%
8%

An experiment measures quantities a,b, and c, and X is calculated from X=ab²/c³ . If the percentage error in a,b,c are ±1%, ±3% and ± 2% respectively, the percentage error in X will be

0%
± 13 %
0%
± 7 %
0%
± 4 %
0%
± 1 %

What is the % error in measurement of ‘T’ of a pendulum if maximum errors in measurements of length and ‘g’ are 2% and 4% respectively?

0%
6%
0%
3%
0%
4%
0%
5%

The dimensions of the Gravitational constant G are

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0%
2)
0%
0%

The dimension of capacitance Is (where Q is the dimension of charge)

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0%
2)
0%
0%

Physics is one of the basic disciplines in the category of ............... sciences.

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Astro
0%
Natural
0%
Space
0%
Genetic

The range of time scale is about ...............

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10–10 sec to 1026 sec
0%
10–15 sec to 1015 sec
0%
10–22 sec to 1018 sec
0%
1020 sec to 1025 sec

How much times is the strong nuclear force stronger then weak nuclear force ?

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1013
0%
102
0%
10–13
0%
10–2

How much times is the strong nuclear force stronger then electromagnetic force ?

0%
1013
0%
102
0%
10–13
0%
10–2

How much times is the electromagnatic force stronger then Gravitational force

0%
1013
0%
10–13
0%
1036
0%
10–36

If the resulting external force acting on system is zero then ............... of the system is constant and if the resultant external torque acting on a system is zero then ............... of the system is constant.