1) Quantity X has a fractional uncertainty of x. Quantity Y has a fractional uncertainty of y.What is the fractional uncertainty in x/y2 ? a) X + Y b) X - Y c) X + 2Y d) X - 2Y 2) The SI unit of specific heat capacity is J kg–1K–1.What is the unit of specific heat capacity expressed in SI base units? a) ms–2K–1 b) kg ms–1K–1 c) m2 s–2K–1 d) kg m2 s–1K–1 3) Which expression has the same SI base units as pressure? a) force/length x speed b) force/length x time c) mass/length x (time)2 d) mass x (time)2/length  4) What is an approximate value for the speed of sound in air? a) 30ms-1 b) 300ms-1 c) 30000ms-1 d) 3 x 108ms-1 5) A student wishes to measure a distance of about 10cm to a precision of 0.01cm. Which measuring instrument should be used? a) Metre rule b) Micrometer c) Tape measure d) Vernier calipers 6) A student wishes to measure a distance of about 10cm to a precision of 0.001cm. Which measuring instrument should be used? a) Metre rule b) Micrometer c) Tape measure d) Vernier calipers 7) Which unit is equivalent to the coulomb? a) ampere per second b) joule per volt c) watt per ampere d) watt per volt 8) What is equivalent to 2000 microvolts? a) 2µJ C–1 b) 2 mV c) 2 pV d) 2000 mV 9) Which quantity is an SI base quantity? a) force b) newton c) second d) time 10) A student takes measurements to determine the constant acceleration of a model car moving from rest in a straight line. The measured values with their absolute uncertainties are shown. What is the acceleration and its absolute uncertainty? a) (0.11 ± 0.01) m s–2 b) (0.11 ± 0.02) m s–2 c) (0.15 ± 0.01) m s–2 d) (0.15 ± 0.02) m s–2 11) What is the definition of acceleration? a) The rate of change of displacement b) The rate of change of kinetic energy c) The rate of change of momentum d) The rate of change of velocity 12) A student estimates the maximum speed of some different moving objects.Which maximum speed is not a reasonable estimate? a) container ship: 10 m s–1 b) Olympic sprinter: 0.1 kms–1 c) racing car: 9000 cm s–1 d) snail: 0.01km h–1 13) Which quantity is not an SI base quantity? a) Charge b) Mass c) Temperature d) Time 14) A couple consists of two forces, each of magnitude F, that act in opposite directions in the same plane. The perpendicular distance between the two forces is d. What is the torque of the couple?  a) Fd/2 b) F/d c) Fd d) 2Fd 15) Which statement about mass is correct? a) Mass has a magnitude and a direction. b) Mass resists changes in motion. c) The greater the mass of an object, the greater its acceleration when falling in a vacuum. d) The mass of an object depends on its location. 16) Which expression for pressure is correct? a) Force per unit area b) Mass per unit area c) Mass per unit volume d) Weight per unit volume 17) What is a reasonable estimate of the cross-sectional area of the wire in a paper clip? a) 1 × 10–3 m2 b) 8 × 10–5 m2 c) 8 × 10–7 m2 d) 1 × 10–9 m2 18) Which unit is not an SI base unit? a) A b) kg c) C d) s 19) What is the best estimate of the number of atoms in a piece of metal of volume 50 cm3 ? a) 5 x1015 b) 5 x1025 c) 5 x1029 d) 5 x1031 20) A copper pipe has a true diameter of 42.03 mm.A builder measures the diameter of the pipe five times using digital calipers. The measurements are shown. a) precise but not accurate b) not precise and not accurate c) accurate but not precise d) accurate and precise

A- Level:Physics 9702 Paper - I : Physical Quantities & Measurement By Sir Zahid

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