General Science

What is the best description of density?

A SI unit of potential difference
B point through which resultant gravitational force may be considered to act
C mass per unit volume
D unit of energy

In general science, ultraviolet refers to:

A point through which resultant gravitational force may be considered to act
B rate of doing work
C electromagnetic radiation shorter in wavelength than visible violet
D an object remains at rest or in uniform straight-line motion unless acted on by a net external force

What is the best description of gravitational acceleration?

A combining light nuclei with energy release
B apparent frequency change due to relative motion
C machine converting mechanical energy into electrical energy
D acceleration due to gravity, about 9.8 m/s² near Earth

What is the best description of diode?

A separation of white light into component colours
B semiconductor device that primarily permits current in one direction
C force per unit area
D heat absorbed or released during a phase change without temperature change

In general science, LED refers to:

A circuit with multiple branches
B light-emitting diode
C repetition of sound caused by reflection
D material with conductivity between conductor and insulator

What is the best description of heat?

A mass per unit volume
B energy transferred because of a temperature difference
C force multiplied by displacement in the direction of force
D electrostatic force varies with charges and inverse square of distance in vacuum

In general science, convex mirror refers to:

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

Which statement correctly identifies work?

A opposition to electric current
B force multiplied by displacement in the direction of force
C device converting light directly into electrical energy
D magnet produced by electric current

In general science, electrical power refers to:

A production of emf by changing magnetic flux
B ideal oscillating bob suspended by a light string
C SI unit of electric charge
D rate of electrical energy transfer

Which statement correctly identifies Doppler effect?

A apparent frequency change due to relative motion
B electrostatic force varies with charges and inverse square of distance in vacuum
C time for one complete oscillation
D force multiplied by displacement in the direction of force

What is the best description of wavelength?

A heat transfer by electromagnetic waves
B pressure applied to an enclosed fluid is transmitted throughout the fluid
C energy due to motion
D distance between corresponding points of successive waves

What is the best description of magnetic field?

A mass multiplied by velocity
B difference between actual and potential output in an economy
C about 3 × 10^8 m/s in vacuum
D region where magnetic forces can act

In general science, refraction refers to:

A electromagnetic radiation strongly associated with thermal radiation
B SI unit of force
C change in direction of light when entering another medium
D about 3 × 10^8 m/s in vacuum

Which statement correctly identifies electromagnet?

A force per unit area
B magnet produced by electric current
C production of emf by changing magnetic flux
D change in momentum produced by a force acting over time

What is the best description of inertia?

A increase in dimensions with temperature rise
B diverging lens
C measure related to average kinetic energy of particles
D tendency of an object to resist change in its state of motion

Which of the following is most closely associated with ultraviolet?

A force opposing relative motion or its tendency between surfaces
B electromagnetic radiation shorter in wavelength than visible violet
C mass multiplied by velocity
D heat needed to raise unit mass by one degree

In general science, centre of gravity refers to:

A electrostatic force varies with charges and inverse square of distance in vacuum
B point through which resultant gravitational force may be considered to act
C ideal oscillating bob suspended by a light string
D force multiplied by displacement in the direction of force

Which of the following is most closely associated with work?

A SI unit of electric charge
B large oscillation when driving frequency matches natural frequency
C ideal oscillating bob suspended by a light string
D force multiplied by displacement in the direction of force

In general science, potential difference refers to:

A device converting light directly into electrical energy
B work done per unit charge
C SI unit of pressure
D electromagnetic radiation shorter in wavelength than visible violet

Which of the following is most closely associated with speed of light?

A region where magnetic forces can act
B about 343 m/s in air near room temperature
C about 3 × 10^8 m/s in vacuum
D SI unit of force

Which of the following is most closely associated with centre of gravity?

A tendency of an object to resist change in its state of motion
B energy transferred because of a temperature difference
C acceleration due to gravity, about 9.8 m/s² near Earth
D point through which resultant gravitational force may be considered to act

What is the best description of power?

A rate of doing work
B device changing AC voltage through electromagnetic induction
C distance between corresponding points of successive waves
D V = IR under constant physical conditions

In general science, inertia refers to:

A machine converting electrical energy into mechanical energy
B sound below about 20 Hz
C circuit with a single current path
D tendency of an object to resist change in its state of motion

In general science, radioactivity refers to:

A SI unit of power
B time required for half a radioactive sample to decay
C SI unit of electrical resistance
D spontaneous emission from unstable nuclei

Which of the following is most closely associated with temperature?

A diverging spherical mirror
B opposition to electric current
C measure related to average kinetic energy of particles
D maximum displacement from mean position