Flashcards

Question 1

What is the unit of force in the SI system?

Answer 1

Newton (N)

Question 2

True or False: The acceleration due to gravity on Earth is approximately 9.81 m/s².

Answer 2

True

Question 3

Fill in the blank: The formula for calculating work done is ______.

Answer 3

Work = Force x Distance

Question 4

What does the symbol ‘v’ represent in physics?

Answer 4

Velocity

Question 5

Define kinetic energy.

Answer 5

The energy of an object due to its motion.

Question 6

What is the formula for kinetic energy?

Answer 6

KE = 1/2 mv²

Question 7

What is the principle of conservation of energy?

Answer 7

Energy cannot be created or destroyed, only transformed from one form to another.

Question 8

True or False: A denser medium generally increases the speed of sound.

Answer 8

False

Question 9

What is the unit of power?

Answer 9

Watt (W)

Question 10

Fill in the blank: The formula for gravitational potential energy is ______.

Answer 10

PE = mgh

Question 11

What does ‘m’ represent in the formula for gravitational potential energy?

Answer 11

Mass

Question 12

Describe the difference between scalar and vector quantities.

Answer 12

Scalar quantities have magnitude only, while vector quantities have both magnitude and direction.

Question 13

What is the formula for density?

Answer 13

Density = Mass/Volume

Question 14

True or False: Light travels faster in a vacuum than in air.

Answer 14

True

Question 15

What is the law of reflection?

Answer 15

The angle of incidence equals the angle of reflection.

Question 16

Fill in the blank: The formula for pressure is ______.

Answer 16

Pressure = Force/Area

Question 17

What is the SI unit of temperature?

Answer 17

Kelvin (K)

Question 18

What is meant by ‘electromagnetic spectrum’?

Answer 18

The range of all types of electromagnetic radiation.

Question 19

True or False: The frequency of a wave is inversely proportional to its wavelength.

Answer 19

True

Question 20

What does ‘ohm’ measure?

Answer 20

Electrical resistance

Question 21

What is Ohm’s Law?

Answer 21

Voltage = Current x Resistance

Question 22

Fill in the blank: The total resistance in a series circuit is ______.

Answer 22

The sum of individual resistances.

Question 23

What is the function of a transformer?

Answer 23

To change the voltage of an alternating current.

Question 24

What is the formula for calculating the efficiency of a machine?

Answer 24

Efficiency = (Useful energy output / Total energy input) x 100%

Question 25

What type of energy is stored in a compressed spring?

Answer 25

Elastic potential energy

Question 26

True or False: The speed of light is approximately 3 x 10^8 m/s.

Answer 26

True

Question 27

What is the main purpose of a cathode ray tube?

Answer 27

To display images by directing electron beams onto a phosphorescent screen.

Question 28

Fill in the blank: The formula for calculating the force of gravity is ______.

Answer 28

F = G(m1m2/r²)

Question 29

What is the difference between an elastic and inelastic collision?

Answer 29

In an elastic collision, kinetic energy is conserved; in an inelastic collision, it is not.

Question 30

What is a renewable energy source?

Answer 30

An energy source that is replenished naturally, such as solar or wind energy.

Question 31

What is the principle behind a hydraulic system?

Answer 31

It uses incompressible fluid to transmit force.

Question 32

True or False: The absolute zero temperature is 0 degrees Celsius.

Answer 32

False

Question 33

What is the primary role of a fuse in an electrical circuit?

Answer 33

To prevent excessive current flow and protect the circuit.

Question 34

What does 'current' measure in an electrical circuit?

Answer 34

The flow of electric charge.

Question 35

Fill in the blank: The formula for calculating wave speed is ______.

Answer 35

Wave speed = Frequency x Wavelength