NEET Physics Unit of Physical Quantities MCQs Set A

Question. Which one of the following pairs of quantities and their units is a proper match?
(a) Magnetic flux – weber
(b) Capacitance – henry
(c) Impulse – N/sec
(d) Power – farad

Answer: A

Question. One second is defined to be equal to
(a) 9192631770 periods of the cesium clock
(b) 1650763.73 periods of the cesium clock
(c) 652189.63 periods of the krypton clock
(d) 1650763.73 periods of the krypton clock

Answer: A

Question. One pico farad is equal to
(a) 10^–12 farad
(b) 10^–24 farad
(c) 10^–18 farad
(d) 10^–6 farad

Answer: A

Question. ‘Torr’ is the unit of
(a) pressure
(b) volume
(c) density
(d) flux

Answer: A

Question. Very large distances such as the distance of a Planet or a star from Earth can be measured by
(a) Parallax method
(b) All of these
(c) Millikan’s oil drop method
(d) Spectrograph

Answer: A

Question. Joule second is a unit of
(a) angular momentum
(b) torque
(c) energy
(d) power

Answer: A

Question. Temperature can be expressed as derived quantity in terms of
(a) None of these
(b) mass and time
(c) length and mass
(d) length, mass and time

Answer: A

Question.  Light year is
(a) the distance travelled by light in free space in one year
(b) time taken by earth to go once around the sun.
(c) time taken by light to travel from sun to earth
(d) light emitted by the sun in one year.

Answer: A

Question. The unit of the coefficient of viscosity in S.I. system is
(a) kg/m-s
(b) kg/m-s²
(c) m-s/kg²
(d) m/kg-s

Answer: A

Question. The unit of the Stefan-Boltzmann's constant is
(a) W/m²K⁴
(b) W/m²
(c) W/m²K
(d) W/m²K²

Answer: A

Question. The wrong unit conversion among the following is
(a) 1 astronomical unit = 1.496 × 10^–11m
(b) 1 light year = 9.46 × 10¹⁵m
(c) 1 fermi = 10^–15m
(d) 1 angstrom = 10^–10m

Answer: A

Question. Unit of specific resistance is
(a) ohm – m
(b) ohm/m
(c) ohm m³
(d) ohm/m²

Answer: A

Question.  Unit of magnetic moment is
(a) ampere–metre²
(b) weber–metre²
(c) ampere–metre
(d) weber/metre

Answer: A

Question.  Surface tension of a liquid is 70 dyne/cm. Its value in SI is
(a) 7 × 10^–2 N/m
(b) 7 × 10³ N/m
(c) 7 × 10² N/m
(d) 70 N/m

Answer: A

Question. Assertion : When we change the unit of measurement of a quantity, its numerical value changes.
Reason : Smaller the unit of measurement smaller is its numerical value.
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(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: A

Question.  Which of the following represents incorrect unit?
(a) Energy = kg-m/sec
(b) Pressure = N/m²
(c) Surface tension = N/m
(d) None of these

Answer: A

Question. Which of the following is the unit of molar gas constant?
(a) JK^–1 mol^–1
(b) Joule
(c) JK^–1
(d) J mol^–1

Answer: A

Question. Number of fundamental units in SI system is
(a) 7
(b) 3
(c) 5
(d) 4

Answer: A

Question. Which one of the following is not measured in units of energy ?
(a) Impulse × time
(b) Force × distance
(c) Moment of inertia × (angular velocity)²
(d) Couple × angle

Answer: A

Question. If x = at + bt², where x is the distance travelled by the body in kilometers while t is the time in seconds, then the unit of b is
(a) km/s²
(b) kms²
(c) kms
(d) km/s

Answer: A

Question. If unit of length and force are increased 4 times. The unit of energy
(a) is increased by 16 times
(b) is increased by 8 times
(c) remains unchanged
(d) is increased by 4 times

Answer: A