2023 Paper 2 Multiple choice

A 1000 W heater is 75% efficient. The heater is used to increase the temperature of some water from 10°C to 85°C in 7 hours. The specific heat capacity of water is 4200 J kg^-1 K^-1

What mass of water is heated?

• A) 1.0 kg

• B) 13 kg

• C) 60 kg

• D) 110 kg

Which can lead to a value for the absolute zero of temperature?

• A) Boyle's law

• B) Brownian motion

• C) Charles's law

• D) Rutherford scattering

Two protons are separated by a distance of 1 x 10^-9 m. Which is an estimate of the ratio of (the electric repulsion force / gravitational attraction force) for these two protons?

• 10^18

• 10^28

• 10^36

• 10^45

Data are collected for the mass M, radius R, and escape velocity u for each planet in the Solar System. The data show that u is directly proportional to which of the following?

• (M/R)^(1/2)

• (M/R)^(-1/2)

• M/R

• (M/R)^2

What is the linear speed of a satellite in a circular orbit at a height h above the surface of a planet of mass M and radius R?

• 
• 
• 
• 

Which statement is not true for a satellite in a geostationary orbit?

• The satellite orbits in the plane of the Earth’s equator.

• The satellite has the same angular velocity as a point on the Earth’s surface.

• The satellite takes 24 hours to orbit the Earth.

• Signals from the satellite can be sent to any point on the Earth’s surface during one orbit.

What is the magnitude of the field strength at the center of the circle formed by six metal spheres each carrying a charge of magnitude Q, spaced around a circle of diameter d?

• 0

• Q / (πε₀d²)

• 2Q / (πε₀d²)

• 4Q / (πε₀d²)

If two point charges are separated by a distance of 200 mm and the force of attraction between them is 180 µN, what is the new force of attraction when the distance between the point charges is increased by 400 mm?

• 20 µN

• 45 µN

• 60 µN

• 90 µN

What is the direction of the electric field in the diagram where an electron moves in a vertical plane?

• Vertically down the plane.

• Vertically up the plane.

• Horizontally into the plane.

• Horizontally out of the plane.

What does the total area under the curve from R to infinity represent in the graph of electric field strength E surrounding a charged sphere of radius R?

• The capacitance of the sphere.

• The charge held on the sphere.

• The electric potential of the sphere.

• The energy needed to remove an electron from the sphere.