Flashcards
What is the unit of force in the SI system?
Newton (N)
True or False: The acceleration due to gravity on Earth is approximately 9.81 m/s².
True
Fill in the blank: The formula for calculating work done is ______.
Work = Force x Distance
What does the symbol ‘v’ represent in physics?
Velocity
Define kinetic energy.
The energy of an object due to its motion.
What is the formula for kinetic energy?
KE = 1/2 mv²
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only transformed from one form to another.
True or False: A denser medium generally increases the speed of sound.
False
What is the unit of power?
Watt (W)
Fill in the blank: The formula for gravitational potential energy is ______.
PE = mgh
What does ‘m’ represent in the formula for gravitational potential energy?
Mass
Describe the difference between scalar and vector quantities.
Scalar quantities have magnitude only, while vector quantities have both magnitude and direction.
What is the formula for density?
Density = Mass/Volume
True or False: Light travels faster in a vacuum than in air.
True
What is the law of reflection?
The angle of incidence equals the angle of reflection.
Fill in the blank: The formula for pressure is ______.
Pressure = Force/Area
What is the SI unit of temperature?
Kelvin (K)
What is meant by ‘electromagnetic spectrum’?
The range of all types of electromagnetic radiation.
True or False: The frequency of a wave is inversely proportional to its wavelength.
True
What does ‘ohm’ measure?
Electrical resistance
What is Ohm’s Law?
Voltage = Current x Resistance
Fill in the blank: The total resistance in a series circuit is ______.
The sum of individual resistances.
What is the function of a transformer?
To change the voltage of an alternating current.
What is the formula for calculating the efficiency of a machine?
Efficiency = (Useful energy output / Total energy input) x 100%
What type of energy is stored in a compressed spring?
Elastic potential energy
True or False: The speed of light is approximately 3 x 10^8 m/s.
True
What is the main purpose of a cathode ray tube?
To display images by directing electron beams onto a phosphorescent screen.
Fill in the blank: The formula for calculating the force of gravity is ______.
F = G(m1m2/r²)
What is the difference between an elastic and inelastic collision?
In an elastic collision, kinetic energy is conserved; in an inelastic collision, it is not.
What is a renewable energy source?
An energy source that is replenished naturally, such as solar or wind energy.
What is the principle behind a hydraulic system?
It uses incompressible fluid to transmit force.
True or False: The absolute zero temperature is 0 degrees Celsius.
False
What is the primary role of a fuse in an electrical circuit?
To prevent excessive current flow and protect the circuit.
What does ‘current’ measure in an electrical circuit?
The flow of electric charge.
Fill in the blank: The formula for calculating wave speed is ______.
Wave speed = Frequency x Wavelength
