Physics

Question 1

What is the unit of force?

Answer 1

Newton (N)

Question 2

True or False: Energy can be created or destroyed.

Answer 2

False

Question 3

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

Answer 3

distance/time

Question 4

What is the acceleration due to gravity on Earth?

Answer 4

Approximately 9.81 m/s²

Question 5

What is the formula for calculating kinetic energy?

Answer 5

KE = 1/2 mv²

Question 6

Which of the following is a scalar quantity? A) Velocity B) Speed C) Acceleration

Answer 6

B) Speed

Question 7

What is the law of conservation of energy?

Answer 7

Energy cannot be created or destroyed, only transformed.

Question 8

True or False: The higher the temperature of an object, the more kinetic energy its particles have.

Answer 8

True

Question 9

What is the main difference between mass and weight?

Answer 9

Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.

Question 10

Fill in the blank: The SI unit of power is _____.

Answer 10

Watt (W)

Question 11

What is the formula for calculating gravitational potential energy?

Answer 11

PE = mgh

Question 12

Which type of energy is stored in an object due to its position?

Answer 12

Potential energy

Question 13

True or False: A machine can create energy.

Answer 13

False

Question 14

What is the principle of moments?

Answer 14

For an object in equilibrium, the sum of clockwise moments about a pivot equals the sum of anti-clockwise moments.

Question 15

What is the unit of pressure?

Answer 15

Pascal (Pa)

Question 16

Which of the following is a vector quantity? A) Distance B) Speed C) Force

Answer 16

C) Force

Question 17

What is the formula for density?

Answer 17

Density = mass/volume

Question 18

Fill in the blank: The total energy in a closed system _____.

Answer 18

remains constant

Question 19

What does the term ‘work’ mean in physics?

Answer 19

Work is done when a force causes an object to move.

Question 20

True or False: Sound travels faster in air than in water.

Answer 20

False

Question 21

What is the formula for Ohm’s Law?

Answer 21

V = IR

Question 22

Fill in the blank: The unit of electric charge is _____.

Answer 22

Coulomb (C)

Question 23

What is the function of a capacitor?

Answer 23

To store electrical energy.

Question 24

Which type of wave is sound?

Answer 24

Longitudinal wave

Question 25

What is the speed of light in a vacuum?

Answer 25

Approximately 3.00 x 10^8 m/s

Question 26

True or False: Refraction is the bending of light as it passes from one medium to another.

Answer 26

True

Question 27

What is the formula for calculating the frequency of a wave?

Answer 27

Frequency = 1/period

Question 28

Fill in the blank: The phenomenon of an object moving faster than the speed of sound is called _____.

Answer 28

supersonic

Question 29

What is the principle behind levers?

Answer 29

A lever amplifies force or changes the direction of force.

Question 30

What is the definition of a Newton?

Answer 30

A force that causes a mass of one kilogram to accelerate at one meter per second squared.

Question 31

True or False: An object in motion will stay in motion unless acted upon by an external force.

Answer 31

True

Question 32

What is the significance of the center of mass?

Answer 32

It is the point where the mass of an object is concentrated.

Question 33

What type of energy transformation occurs in a hydroelectric power plant?

Answer 33

Potential energy to kinetic energy to electrical energy.

Question 34

Fill in the blank: The force of friction always acts in the direction _____.

Answer 34

opposite to the direction of motion

Question 35

What is the difference between renewable and non-renewable energy sources?

Answer 35

Renewable sources can be replenished naturally; non-renewable sources cannot.

Question 36

What is the formula for calculating the moment of a force?

Answer 36

Moment = force x distance from pivot

Question 37

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

Answer 37

True

Question 38

What is the unit of electrical resistance?

Answer 38

Ohm (Ω)

Question 39

Fill in the blank: The total resistance in a series circuit is equal to the _____.

Answer 39

sum of all individual resistances

Question 40

What is the role of a transformer?

Answer 40

To change the voltage of an alternating current.

Question 41

What is the difference between a conductor and an insulator?

Answer 41

Conductors allow electric current to flow; insulators do not.

Question 42

What is the principle of conservation of momentum?

Answer 42

The total momentum of a closed system remains constant unless acted upon by external forces.

Question 43

True or False: An increase in temperature generally increases the resistance of a conductor.

Answer 43

True

Question 44

What is the definition of specific heat capacity?

Answer 44

The amount of heat required to raise the temperature of one kilogram of a substance by one degree Celsius.

Question 45

Fill in the blank: The unit of energy is _____.

Answer 45

Joule (J)