JEE Questions for Physics Units And Measurements Quiz 11 - MCQExams.com

Assertion Surface tension and surface energy have the same dimensions.
Reason Because both have the same SI 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.
Assertion In y = A sin (ωt – kx), (ωt – kx) dimensionless.
Reason Because dimension of ω = [M0L0T].
  • 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 constant 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 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.

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The period of a body under S.H.M. is represented byT = Pa Db Sc,where P is pressure, D is density and S is surface tension, then values of a,b and c are

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If energy (E), velocity (V) and time (T) are chosen as fundamental quantities, the dimensions of surface tension will be represented as

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P represents radiation pressure, c represents speed of light and S represents radiation energy striking unit area per sec. The non Zero integers x, y, z such that PxSycz is dimensionless are
  • x = 1,y = 1, z = 1
  • x = –1,y = 1,z = 1
  • x = 1,y = –1,z = 1
  • x = 1,y = 1,z = -1

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In The formula, X = 3YZ2; X has dimensions of capacitance and Z has dimensions of magnetic induction. The dimensions of Y are :

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The force acting between two point charges kept at a certain distance is F1 Now magnitude of charge are double and distance between them is double. The force acting between them is F2 find out the ratio of F2/F1 = ...............
  • 16 : 1
  • 1 : 16
  • 1 : 1
  • 1 : 8
1 g = ............... amu

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The intercepted area of the spherical surface about the center is 0.25 m2 having diameter 50 cm what will be solid angle ?

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One planet is observed from two diametrically opposite point A and B on the earth the angle subtended at the planet by the two directions of observations is 1.8o. Given the diameter of the earth to be about 1.276 × 107 m. What will be distance of the planet from the earth ?

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In an experiment to determine the density of a cube the percentage error in the measurement of mass is 0.25 % and the percentage error in the measurement of length is 0.50 % what will be the percentage error in the determination of its density ?
  • 2.75 %
  • 1.75 %
  • 0.75 %
  • 1.25 %

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  • 18 %
  • 14 %
  • 21 %
  • 12 %
In the experiment of simple pendulum error in length of pendulum (l)is 5 % and that of g is 3 % then find percentage error in measurement of periodic time for pendulum
  • 4.2 %
  • 1.2 %
  • 2 %
  • 4 %
Heat produced in a current carrying conducting wire is H = I2Rt it percentage error in I, R and t is 2 % , 4 % and 2 % respectively then total percentage error in measurement of heat energy ...............
  • 8 %
  • 15 %
  • 5 %
  • 10 %

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  • a + b
  • 2b + a
  • 2a + b
  • a – b

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  • 8 %
  • 10 %
  • 12 %
  • 14 %
The dimensional formula of plank’s constant is ...............

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Dimensional formula of latent heat is ...............

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Write dimensional formula of coefficient of viscosity

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Which physical quantity has unit of pascal - second ?
  • Force
  • Energy
  • Coefficient of viscocity
  • velocity

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Pressure P = A cosBx + c sinDt where x in meter and t in time then find dimensional formula of D/B

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Equation of force F = at + bt2 where F is force in Newton t is time in second, then write unit of b.
  • Nm–1
  • Nm2
  • Nm
  • Nm–2

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Equation of physical quantity v = at + bt2 where v = velocity t = time so write the dimensional formula of a in this equation

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Density of substance in CGS system is 3.125 gm/cm3 what is its magnitude is SI system ?
  • 0.3125
  • 3.125
  • 31.25
  • 3125
A cube has numerically equal volume and surface area calculate the volume of such a cube.
  • 2000 Unit
  • 216 Unit
  • 2160 Unit
  • 1000 Unit
If energy E = Gphqcr where G is the universal gravitational constant. h is the plank’s constant and c is the velocity of light, then the values of p, q and r are respectively

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If the centripetel force is of the form mavbrc find the values of a, b and c
  • 1, 2, 1
  • 1, 2, –1
  • 1, 3, –2
  • –1, 3, –1

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Which of the following is not equal to watt?
  • joule/second
  • ampere × volt
  • (ampere)2 × ohm
  • ampere/volt
Newton–second is the unit of
  • Velocity
  • Angular momentum
  • Momentum
  • Energy
Which of the following is not represented in correct unit?

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One nanometre is equal to
  • 109 mm
  • 10–6 cm
  • 10–7 cm
  • 10–9 cm
A suitable unit for gravitational constant is
  • kg–m sec–1
  • Nm–1 sec
  • Nm2 kg–2
  • kg m sec–1
In S = a + bt + ct2. S is measured in metre and t in second. The unit of c is
  • ms–2
  • None
  • m
  • ms–1
The unit of the coefficient of viscosity in SI system is
  • m/kg – s
  • m – s/kg2
  • kg/m – s2
  • kg/m – s
Electron volt is a unit of
  • Charge
  • Potential difference
  • Momentum
  • Energy
Unit of power is
  • Kilowatt
  • Kilowatt–hour
  • Dyne
  • Joule

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Which is the correct unit for measuring nuclear radii?
  • Micron
  • Millimetre
  • Angstron
  • Fermi
The unit for nuclear dose given to a patient is
  • Fermi
  • Rutherford
  • Curie
  • Roentgen
Volt/metre is unit of
  • Potential
  • Work
  • Force
  • Electric intensity
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