## Thursday, 18 September 2014

### MULTIPLE CHOICE PHYSICS QUESTIONS

1.       When a voltage V of 12.2 V is applied to a DC motor, the current I in the motor is 0.20 A. Which one of the following is the output power VI of the motor given to the correct appropriate number of significant digits?
A.      2 W
B.      2.4 W
C.      2.40 W
D.      2.44 W
2.Which one of the following lists a fundamental unit and a derived unit?

 A. ampere second B. coulomb kilogram C. coulomb newton D. metre kilogram
3.A student measures the current in a resistor as 677 mA for a potential difference of 3.6 V. A calculator shows the resistance of the resistor to be 5.3175775 Ω. Which one of the following gives the resistance to an appropriate number of significant figures?
A.      5.3 Ω
B.      5.32 Ω
C.      5.318 Ω
D.      5.31765775 Ω

4.Which one of the following is a vector quantity?
A.      Electric power
B.      Electrical resistance
C.      Electric field strength
D.      Electric potential difference

5.The diameter of a proton is of the order of magnitude of
A.      10–12 m.
B.      10–15 m.
C.      10–18 m.
D.      10–21 m.

6.Which one of the following is a scalar quantity?
A.      Pressure
B.      Impulse
C.      Magnetic field strength
D.      Weight
7.The resistive force F acting on a sphere of radius r moving at speed v through a liquid is given by
F = cvr
where c is a constant. Which of the following is a correct unit for c?
A.      N
B.      N s–1
C.      N m2 s–1
D.      N m–2 s

8  Which one of the following contains three fundamental units?
 A. Metre Kilogram Coulomb B. Second Ampere Newton C. Kilogram Ampere Kelvin D. Kelvin Coulomb Second

9.The kWh is equal to
A.      1.0 × 103 J.
B.      3.6 × 103 J.
C.      6.0 × 104 J.
D.      3.6 × 106 J.
10.Which one of the following measurements is stated correctly to two significant digits?
A.      0.006 m
B.      0.06 m
C.      600 m
D.      620 m
11.Sub-multiples of units may be expressed using a prefix. Which one of the following lists the prefixes in decreasing order of magnitude?
 A. centi- micro- milli- nano- B. milli- centi- nano- micro- C. centi- milli- micro- nano- D. milli- micro- centi- nano-
12.Which one of the following includes three vector quantities?
 A. velocity weight field strength B. weight mass field strength C. velocity energy weight D. mass energy field strength

13.The length of a page of the examination paper is approximately 30 cm.
Which of the following gives the order of magnitude for the time taken for light to travel the length of the    page?
A.      10–7 s
B.      10–8 s
C.      10–9 s
D.      10–10 s
14.The mass of a body is measured to be 0.600 kg and its acceleration to be 3 m s–2. The net force on the body, expressed to the correct number of significant figures is
A.      1.8 N.
B.      1.80 N.
C.      2 N.
D.      2.0 N.

15.The kilowatt-hour (kW h) is equivalent to
A.      6.0×104 J .
B.      6.0×104W .
C.      3.6×106 J .
D.      3.6×106W .
16.Which of the following contains three scalar quantities?
 A. mass charge speed B. density weight mass C. speed weight charge D. charge weight density 17.The order of magnitude of the weight of an apple is
A.      10–4 N.
B.      10–2 N.
C.      1 N.
D.      102 N.