NEET Physics Dimensions of Physical Quantities MCQs Set A

a) 40

b) 400

c) 0.04

d) 0.4

Answer: 40

Question: Dimensional analysis can be applied to

a) All of these

b) to convert from one system of units to another

c) deduce relations among the physical quantities

d) check the dimensional consistency of equations

Answer: All of these

Question: The dimensional formula for relative density is

a) [M^oL^oT^o]

b) [M^oL^–3]

c) [ML^–3]

d) None of these

Answer: [M^oL^oT^o]

Question: The dimensions of speed and velocity are

a) [LT^–1], [LT ^–1]

b) [LT^–1], [LT ^–2]

c) [L²T], [LT ^–1]

d) [LT], [LT]

Answer: [LT^–1], [LT ^–1]

Question:  [MLT^–1] + [MLT^–1] = .............

a) [MLT^–1]

b) None of these

c) [M°L°T°]

d) 2[MLT^–1]

Answer: [MLT^–1]

Question: The dimensions of pressure is equal to

a) energy per unit volume

b) energy

c) force per unit volume

d) force

Answer: energy per unit volume

Question:  The dimensional formula of angular velocity is

a)

b)

c)

d)

Answer:

Question: The physical quantity that has no dimensions is

a) strain

b) angular momentum

c) angular velocity

d) linear momentum

Answer: strain

Question: Which is dimensionless?

a) Energy/work

b) Velocity/acceleration

c) Force/acceleration

d) Volume/area

Answer:  Energy/work

Question:

a)

b)

c)

d)

Answer:

Question: Dimensions of specific heat are

a)

b)

c)

d)

Answer:

More Questions.....................................................

Question:  The dimensions of torque are

a)

b)

c)

d) None of these

Answer:

Question:  The dimensional formula for magnetic flux is

a)

b)

c)

d)

Answer:

Question:  The dimensions of magnetic field in M, L, T and C (coulomb) is given as

a)

b)

c)

d)

Answer:

Question: The dimensions of coefficient of self inductance are

a)

b)

c)

d)

Answer:

Question: The division of energy by time is X. The dimensional formula of X is same as that of

a) power

b) electric field

c) momentum

d) torque

Answer:  power

Question: Which of the following is a dimensional constant?

a) Gravitational constant

b) Dielectric constant

c) Refractive index

d) Relative density

Answer: Gravitational constant

Question:  The dimensions of mobility are

a)

b)

c)

d) None of these

Answer:

Question: Which one of the following represents the correct dimensions of the coefficient of viscosity?

a)

b)

c)

d)

Answer:

Question:

a) Assertion is incorrect, reason is correct

b) Assertion is correct, reason is incorrect

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question: The ratio of the dimensions of Planck’s constant and that of the moment of inertia is the dimensions of

a) frequency

b) time

c) velocity

d) angular momentum

Answer:  frequency 

Question: Two quantities A and B have same dimensions which mathematical operation given below is physically meaningful?

a) A/B

b) A + B²

c) A² – B

d) A = B²

Answer: A/B

Question:  The solar constant is defined as the energy incident per unit area per second. The dimensional formula for solar constant is

a)

b)

c)

d)

Answer:

Question:  Distance travelled by a particle at any instant ‘t’ can be represented as S = A (t + B) + Ct2. The dimensions of B are

a)

b)

c)

d)

Answer:

Question:

a) Assertion is incorrect, reason is correct

b) Assertion is correct, reason is incorrect

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: Assertion is incorrect, reason is correct

Question: If P,Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

a) (P – Q) / R

b) PQ / R

c) PQ – R

d) (PR – Q²) / R

Answer:  (P – Q) / R

Question:

a)

b)

c)

d)

Answer:

Question:  Dimensions of ‘resistance’ are same as (where h is Planck’s constant and e is charge)

a)

b)

c)

d)

Answer:

Question:  If L denotes the inductance of an inductor through which a current i is flowing, the dimensions of L i² are

a)

b)

c)

d) Not expressible in M, L, T

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d) None of these

Answer:

Question:

a) P

b) T

c) R

d) V

Answer:  P

Question:

a)

b)

c)

d) None of these

Answer:

Question:

a) work × distance

b) work × time

c) work/time

d) work/distance

Answer: work × distance

Question: If the dimensions of a physical quantity are given by M^a L^b T^c, then the physical quantity will be

a) pressure if a = 1, b = – 1, c = – 2

b) force if a = 0, b = – 1, c = – 2

c) acceleration if a = 1, b = 1, c = – 2

d) velocity if a = 1, b = 0, c = – 1

Answer: pressure if a = 1, b = – 1, c = – 2

Question: If force (F), length (L) and time (T) are assumed to be fundamental units, then the dimensional formula of the mass will be

a)

b)

c)

d)

Answer:

Question:  Which one of the following represents the correct dimensions of the gravitational constant?

a)

b)

c)

d)

Answer:

Question: A force is given by F = at + bt², where t is time, the dimensions of a and b are

a) [M L T^–3] and [M L T^–4]

b) [M L T^–3] and [M L T⁰]

c) [M L T^–1] and [M L T⁰]

d) [M L T^–4] and [M L T^–1]

Answer:  [M L T^–3] and [M L T^–4]

Question:

a) M^–1L2T¹

b) ML²T^–2

c) MLT^–2

d) ML²T

Answer: M^–1L2T¹

Question:

a)

b)

c)

d)

Answer:

Question:

a) L^–1/2T²

b) L^–1/2T¹

c) LT^–2

d) None of these

Answer:  L^–1/2T²

Question:

a) x and A

b) x and B

c) C and z^–1

d) y and B/A

Answer:  x and A

Question:

a) current

b) charge

c) resistance

d) voltage

Answer: current

Question: The thrust developed by a rocket-motor is given by F = mv + A(P₁ – P₂) where m is the mass of the gas ejected per unit time, v is velocity of the gas, A is area of cross-section of the nozzle, P₁ and P₂ are the pressures of the exhaust gas and surrounding atmosphere. The formula is dimensionally

a) correct

b) wrong

c) sometimes wrong, sometimes correct

d) Data is not adequate

Answer:  correct

Question:  A, B, C and D are four different physical quantities having different dimensions. None of them is dimensionless. But we know that the equation AD = C ln (BD) holds true. Then which of the combination is not a meaningful quantity?

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer: