IB DP Physics Topic 1 13Qs Aug '21

Which of the following pairs contains one fundamental and one derived unit?

• A. ampere; kilogram

• B. ampere; coulomb

• C. joule; newton

• D. joule; coulomb

The current, I, through a resistor is measured with a digital ammeter to be 0.10 A. The uncertainty in the calculated value of I² will be

• A. 1 %

• B. 2 %.

• C. 5 %.

• D. 20 %.

Which of the following will reduce random errors in an experiment?

• A. Using an instrument having a greater precision

• B. Checking the calibration of the instrument used

• C. Checking for zero error on the instrument used

• D. Repeating readings

A body accelerates from rest with a uniform acceleration a for time t. The uncertainty in a is 8 % and the uncertainty in t is 4 %. The uncertainty in the speed is

• A. 32 %.

• B. 12 %

• C. 8 %

• D. 2 %

The current in a resistor is measured as 

2.00 A ± 0.02 A. Which of the following correctly identifies the absolute uncertainty and the percentage uncertainty in the current? (Absolute uncertainty : Percentage uncertainty)

• A.0.02 A : 1 %
  

• B. 0.01 A : 0.5 %

• C. 0.02 A : 0.01 %

• D. 0.01 A : 0.005 %

Which of the following is equivalent to the joule?

• A. N m²

• B. N m ^-2

• C. kg m s^-2

• D. kg m²s^-2

Two lengths, a and b, are measured to be 51 ±1 cm and 49 ±1 cm respectively. In which of the following quantities is the percentage uncertainty the largest?

• A. a + b

• B. a - b

• C. a x b

• D. a / b

Which of the following is a valid statement?

• A. A measurement that is not precise can be accurate.

• B. A measurement that is precise is always accurate.

• C. A measurement that is not precise will always be inaccurate.

• D. Repeated measurements will always increase accuracy and precision.

The volume V of a cylinder of height h and radius r is given by the expression

V = r²h.

In a particular experiment, r is to be determined from measurements of V and h.

The uncertainties in V is 7% and in h is 3%. The approximate uncertainty in r is

• A. 10 %

• B. 5 %.

• C. 4%.

• D. 2 %

What is the unit of electrical energy in fundamental SI units?

• A. kg m² C^–1 s

• B. kg m s^–2

• C. kg m² s^–2

• D. kg m² s^–1 A