General Science

What is the best description of potential difference?

A low-resistance path to ground for fault current
B rate of flow of electric charge
C work done per unit charge
D mechanical wave requiring a material medium

Which of the following is most closely associated with earthing?

A pressure applied to an enclosed fluid is transmitted throughout the fluid
B heat transfer by electromagnetic waves
C low-resistance path to ground for fault current
D converging lens

Which statement correctly identifies X-rays?

A combining light nuclei with energy release
B unit of energy
C high-energy electromagnetic radiation used in medical imaging
D SI unit of potential difference

What is the best description of hertz?

A sound below about 20 Hz
B circuit with a single current path
C short-sightedness generally corrected with a concave lens
D SI unit of frequency

What is the best description of volt?

A maximum displacement from mean position
B heat transfer by bulk movement of a fluid
C SI unit of potential difference
D diverging spherical mirror

In general science, parallel circuit refers to:

A sum of kinetic and potential energy
B net force equals rate of change of momentum; for constant mass F = ma
C circuit with multiple branches
D energy due to motion

Which statement correctly identifies ohm?

A sound above about 20 kHz
B machine converting mechanical energy into electrical energy
C SI unit of electrical resistance
D rate of electrical energy transfer

Which statement correctly identifies speed of light?

A about 3 × 10^8 m/s in vacuum
B semiconductor device that primarily permits current in one direction
C safety device that melts when excessive current flows
D high-energy electromagnetic radiation used in medical imaging

In general science, thermal expansion refers to:

A increase in dimensions with temperature rise
B unit of energy
C machine converting electrical energy into mechanical energy
D spontaneous emission from unstable nuclei

In general science, nuclear fission refers to:

A device converting light directly into electrical energy
B large oscillation when driving frequency matches natural frequency
C magnet produced by electric current
D splitting of a heavy nucleus with energy release

Which statement correctly identifies density?

A region where magnetic forces can act
B mass multiplied by velocity
C about 343 m/s in air near room temperature
D mass per unit volume

In general science, simple pendulum refers to:

A SI unit of work and energy
B ideal oscillating bob suspended by a light string
C difference between actual and potential output in an economy
D SI unit of frequency

Which of the following is most closely associated with ultrasound?

A sound above about 20 kHz
B safety device that melts when excessive current flows
C high-energy electromagnetic radiation used in medical imaging
D semiconductor device that primarily permits current in one direction

In general science, solar cell refers to:

A machine converting mechanical energy into electrical energy
B spontaneous emission from unstable nuclei
C device converting light directly into electrical energy
D rate of electrical energy transfer

Which statement correctly identifies convex lens?

A ideal oscillating bob suspended by a light string
B production of emf by changing magnetic flux
C SI unit of electric charge
D converging lens

In general science, time period refers to:

A SI unit of potential difference
B time for one complete oscillation
C net force equals rate of change of momentum; for constant mass F = ma
D sum of kinetic and potential energy

Which of the following is most closely associated with impulse?

A spontaneous emission from unstable nuclei
B change in momentum produced by a force acting over time
C SI unit of potential difference
D unit of energy

Which of the following is most closely associated with ohm?

A SI unit of potential difference
B unit of energy
C SI unit of electrical resistance
D spontaneous emission from unstable nuclei

Which of the following is most closely associated with X-rays?

A energy due to motion
B net force equals rate of change of momentum; for constant mass F = ma
C sum of kinetic and potential energy
D high-energy electromagnetic radiation used in medical imaging

Which statement correctly identifies impulse?

A change in momentum produced by a force acting over time
B sound above about 20 kHz
C machine converting mechanical energy into electrical energy
D rate of electrical energy transfer

Which statement correctly identifies free fall?

A about 343 m/s in air near room temperature
B motion under gravity alone, neglecting other forces
C change in momentum produced by a force acting over time
D production of emf by changing magnetic flux

What is the best description of ampere?

A SI unit of electric current
B diverging lens
C measure related to average kinetic energy of particles
D increase in dimensions with temperature rise

Which statement correctly identifies echo?

A opposition to electric current
B repetition of sound caused by reflection
C magnet produced by electric current
D number of oscillations per second

Which of the following is most closely associated with convection?

A material with conductivity between conductor and insulator
B time required for half a radioactive sample to decay
C SI unit of power
D heat transfer by bulk movement of a fluid

Which of the following is most closely associated with dispersion?

A ideal oscillating bob suspended by a light string
B change in momentum produced by a force acting over time
C separation of white light into component colours
D production of emf by changing magnetic flux