IB Physics Paper 1A · SL multiple choice practice papers

Which statements about main-sequence stars are correct?
I.   Radiation pressure and thermal pressure balance gravitational compression.
II.   More massive stars have shorter main-sequence lifetimes.
III.   Their luminosity is independent of their mass.

1. A I and II only
2. B I and III only
3. C II and III only
4. D I, II and III

A block of mass 2 kg slides down a slope inclined at 30° to the horizontal. The coefficient of dynamic friction is 0.2.
What is the acceleration of the block?

1. A 3.2 m s⁻²
2. B 4.9 m s⁻²
3. C 6.6 m s⁻²
4. D 7.5 m s⁻²

A satellite moves at constant speed in a circular orbit. Which statements are correct?
I.   The kinetic energy of the satellite is constant.
II.   The momentum of the satellite is constant.
III.   The gravitational force does no work on the satellite.

1. A I and II only
2. B I and III only
3. C II and III only
4. D I, II and III

A simple pendulum of length 0.5 m is taken to the Moon, where the gravitational field strength is 1.62 N kg⁻¹.
What is its period on the Moon?

1. A 1.4 s
2. B 1.7 s
3. C 3.5 s
4. D 11 s

A travelling wave has wavelength 1.2 m. Two points on the wave are 0.3 m apart along the direction of travel.
What is the phase difference between them, in radians?

1. A 0.25 rad
2. B 0.79 rad
3. C 1.6 rad
4. D 2.5 rad

A radioactive sample has a half-life of 2 days. What fraction of the original nuclei remains undecayed after 6 days?

1. A 0.13
2. B 0.17
3. C 0.25
4. D 0.33