IB Physics Paper 1A · HL multiple choice practice papers

The activity of a sample falls from 1200 Bq to 80 Bq in 12 hours.
What is the half-life?

1. A 0.80 hours
2. B 2.4 hours
3. C 3.1 hours
4. D 32 hours

A box of mass 5 kg is released from rest at the top of a slope 8 m long and 2 m high. A constant friction force of 8 N acts on it.
What is the speed of the box at the bottom of the slope?

1. A 2.6 m s⁻¹
2. B 3.7 m s⁻¹
3. C 5.7 m s⁻¹
4. D 6.3 m s⁻¹

A main-sequence star much more massive than the Sun reaches the end of its main-sequence life. Which row describes its next stage and final state?

Which statements about electromagnetic waves in a vacuum are correct?
I.   They all travel at the same speed.
II.   Their speed depends on their frequency.
III.   They are transverse waves.

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 wire of length 0.2 m carries a current of 3 A in a uniform magnetic field of 0.2 T. The wire makes an angle of 90° with the field.
What is the force on the wire?

1. A 0.060 N
2. B 0.12 N
3. C 0.24 N
4. D 3.0 N

An electron in a hydrogen atom moves from the −1.51 eV level to the −13.60 eV level.
What is the wavelength of the emitted photon?

1. A 91.4 nm
2. B 103 nm
3. C 206 nm
4. D 823 nm