CBSE Class 11 Physics Units and Measurements MCQs Set D

Question. Physical quantities are
(a) quantities such as degrees, radians and steradians
(b) quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
(c) quantities such as pounds, dollars and rupees
(d) quantities such as kilos, pounds and gallons
Answer: b

Question.The acceleration of a car is 10 mile per hour second. The same in ft/s is :
(a) 1.467 ft/s²
(b) 14.67 ft/s²
(c) 40 ft/s²
(d) none of these
Answer: a

Question. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give
(a) 2.75 and 2.74
(b) 2.74 and 2.73
(c) 2.75 and 2.73
(d) 2.74 and 2.74
Answer: d

Question. One slug is equivalent to 14.6 kg. A force of 10 pound is applied on a body of one kg. The acceleration of the body is :
(a) 44.5 m/s²
(b) 4.448 m/s²
(c) 44.4 ft/s²
(d) none of these
Answer: a

Question. One horse power is equal to :
(a) 746 watt
(b) 756 watt
(c) 736 watt
(d) 766 watt
Answer: a

Question. Refer the data from above question. The value of R in calorie per °C mol is :
(a) 2 cal/mol °C
(b) 4 cal/mol °C
(c) 6 cal/mol °C
(d) 8.21 cal/mol °C
Answer: a

Question. 4.32 x 2.0 is equal to :
(a) 8.64
(b) 8.6
(c) 8.60
(d) 8.640
Answer: b

Question. If C and R denote capacitance and resistance respectively, what will be the dimensions of CxR?
(a) [M⁰L⁰TA0]
(b) [ML⁰TA^-2]
(c) [ML⁰TA²]
(d) [MLTA^-2]
Answer: a

Question.The unit of intensity of a wave is W/m ? What are dimensions of intensity of wave ?
(a) [M T ^-3]
(b) [A ML⁰T^-2]
(c) [M⁰L^-1T^-2]
(d) None of these
Answer: a

Question. Which of the following sets of quantities has the same dimensional formula?
(a) Frequency, angular frequency and angular momentum
(b) Surface tension, stress and spring constant
(c) Acceleration, momentum and retardation
(d) Work, energy and torque
Answer: d

Question. Resolution is
(a) a measure of the bias in the instrument
(b) None of these
(c) the smallest amount of input signal change that the instrument can detect reliably
(d) a measure of the systematic errors
Answer: d

Question.1 mm of Hg pressure is equivalent to one torr and one torr is equivalent to 133.3 N/m². The atmospheric pressure in mm of Hg pressure is :
(a) 70 mm
(b) 760 mm
(c) 3.76 mm
(d) none of these
Answer: b

Question. Which of the following units denotes the dimensions [ML2/Q2], where Q represents the electric charge?
(a) Wb/m²
(b) Henry(H)
(c) H/m²
(d) Weber(Wb)
Answer: b

Question. The number of molecules of H₂0 in 90 g of water is :
(a) 35.6 x 10²³
(b) 41.22 x 10²³
(c) 27.2 x 10²³
(d) 30.11 x 10²³
Answer: d

Question. 4.338 + 4.835 x 3.88 + 3.0 is equal to :
(a) 10.6
(b) 10.59
(c) 10.5912
(d) 10.591267
Answer: a

Question. Generally, sugar cubes are added to coffee. A typical sugar cube has an edge of length of 1 cm. Minimum edge length of a cubical box containing one mole of the sugar cubes is:
(a) 840 km
(b) 970 km
(c) 780 km
(d) 750 km
Answer: a

Question. The optical path difference is defined as Δ x = 2π/λ What are dimensions of optical path difference ?
(a) [M⁰L^-1 T^0]
(b) [MLT⁰ ]
(c) [ML⁰T]
(d) [M L^-2 T]
Answer: a

Question. Universal time is based on :
(a) rotation of earth on its axis
(b) oscillation of quartz crystal
(c) vibration of caesium atom
(d) earth's orbital motion around the sun
Answer: a

Question. One nautical mile is 6080 ft. The same in kilometre is :
(a) 0.9 km
(b) 0.8 km
(c) 1.85 km
(d) none of these
Answer: c

Question. The dimensions of heat capacity is :
(a) [L²T^-2θ^-1]
(b) [ML²T^-2θ^-1]
(c) [M^-1L²T^-2θ^-1]
(d) none of these
Answer: b

Question. The dimensions of wavelength is :
(a) [M⁰L⁰T⁰]
(b) [M⁰LT⁰]
(c) [M⁰L^-1 T⁰]
(d) none of these
Answer: b

Question. The dimensional formula of radius of gyration is :
(a) [M⁰L⁰ T°]
(c) [M⁰LT⁰]
(b) [M⁰L⁰T]
(d) none of these
Answer: c

Question. Which of the following pairs has the same dimensions?
(a) specific heat and latent heat
(b) lmpulse and momentum
(c) surface tension and force
(d) moment of lnertia and torque
Answer: b

Question. The concorde is the fastest airlines used for commercial service. It can cruise at 1450 mile per hour (about two times the speed of sound or in other words, mach 2). What is it in m/s ?
(a) 644.4 m/s
(b) 80 m/s
(c) 40 m/s
(d) None of these
Answer: a

Question. The velocity of the body within the error limits, if a body travels uniformly a distance of (13.8 ± 0.2) m in a time (4.0 ± 0.3), is :
(a) (3.45 ± 0.2) m/s
(b) (3.45 ± 0.4) m/s
(c) (3.45 ± 0.3) m/s
(d) (3.45 ± 0.5) m/s
Answer: c

Question. 1.00 x 2.88 is equal to:
(a) 2.88
(b) 2.880
(c) 2.9
(d) none of these
Answer: a

Question. The maximum static friction on a body is F = μN. Here, N = normal reaction force on the bodyμ. = coefficient of static frictionThe dimensions of p is :
(a) [MLT^-2]
(b) [M⁰L⁰T⁰ θ^-1]
(c) dimensionless
(d) none of these
Answer: c

Question.1 revolution is equivalent to 360°. The value of 1 revolution per minute is :
(a) 2 π rad/s
(b) 0.1047 rad/s
(c) 3.14 rad/s
(d) none of these
Answer: b

Question. While measuring the diameter of a wire by screw gauge, three readings were taken are 1.002 cm, 1.004 cm and 1.006 cm. The absolute error in the third reading is :
(a) 0.002 cm
(b) 0.004 cm
(c) zero
(d) 1.002 cm
Answer: a