IB DP Physics Topic 1 Paper 1 1819

Which quantity has the fundamental SI units of kg m^-1 s^-2?

• A. Energy

• B. Force

• C. Momentum

• D. Pressure

What is the unit of power expressed in fundamental SI units?

• A. $kg\ m\ s^{-2}$

• B. $kg\ m^2\ s^{-2}$

• C. $kg\ m\ s^{-3}$

• D. $kg\ m^2\ s^{-3}$

A student models the relationship between the pressure p of a gas and its temperature T as p = x+ yT.

The units of p are pascal and the units of T are kelvin. What are the fundamental SI units of x and y?

• A

• B

• C

• D

A student wants to determine the angular speed ω of a rotating object. The period T is 0.50 s ±5 %. The angular speed ω is:
 $\frac{2\pi}{T}$  

• A. 0.2 %

• B. 2.5 %

• C. 5 %

• D. 10 %

A student measures the radius R of a circular plate to determine its area. The absolute uncertainty in R is ΔR.
What is the fractional uncertainty in the area of the plate?

• A.  $\frac{2\Delta R}{R}$  

• B.  $\left(\frac{\Delta R}{R}\right)^2$  

• C.  $\frac{2\pi\Delta R}{R}$  

• D.  $\pi\left(\frac{\Delta R}{R}\right)^2$  

A student measures the radius r of a sphere with an absolute uncertainty Δr. What is the fractional uncertainty in the volume of the sphere?

• A. $\left(\frac{\Delta r}{r}\right)^3$

• B. $\frac{3\Delta r}{r}$

• C. $\frac{4\pi\Delta r}{r}$

• D. $4\pi\left(\frac{\Delta r}{r}\right)^3$

The length of the side of a cube is 2.0 cm ± 4 %. The mass of the cube is 24.0 g ± 8 %. What is the percentage uncertainty of the density of the cube?

• A. ± 2 %

• B. ± 8 %

• C. ± 12 %

• D. ± 20 %

A river flows north. A boat crosses the river so that it only moves in the direction east of its starting point.

What is the direction in which the boat must be steered?

• A.

• B.

• C.

• D.

An object is held in equilibrium by three forces of magnitude F, G and H that act at a point in the same plane.

Three equations for these forces are

I. F cos θ = G

II. F = G cos θ + H sin θ

III. F = G + H

Which equations are correct?

• A. I and II only

• B. I and III only

• C. II and III only

• D. I, II and III

• A.

• B.

• C.

• D.