Physics (feb mocks)

Question 1

In a series circuit, what happens to the voltage?

Answer 1

Voltage is shared, total voltage is all voltages added together

Question 2

In a series circuit, what happens to the current?

Answer 2

Current is the same throughout the circuit

Question 3

In a parallel circuit, what happens to the voltage?

Answer 3

Voltage is the same throughout the circuit

Question 4

In a parallel circuit, what happens to the current?

Answer 4

Current is shared, total current is all currents added together

Question 5

Are ammeters connected in series or parallel? What do they measure?

Answer 5

Series, current

Question 6

Are voltmeters connected in series or parallel?

Answer 6

Parallel, voltage

Question 7

What is resistance? What is it measured in?

Answer 7

The opposition to current flow, ohms

Question 8

What does ohms law state?

Answer 8

There is a directly proportional relationship between current and potential difference, provided the temperature stays the same

Question 9

How do you calculate voltage?

Answer 9

Voltage = current x resistance

Question 10

How do you calculate resistance?

Answer 10

Resistance = voltage/current

Question 11

How do you calculate current?

Answer 11

Current = voltage/resistance

Question 12

In series, what happens when adding multiple resistors?

Answer 12

resistance increases and current decreases as more are added?

Question 13

In parallel, what happens when adding multiple resistors?

Answer 13

Resistance decreases and current increases as number of resistors increases

Question 14

How can energy be transferred in a circuit?

Answer 14

mechanically (by a force), electrically, by heating or by radiation

Question 15

What are 5 energy stores?

Answer 15

Chemical (food, fuel), 
GP (objects in high positions), 
EP (stretched, squashed or twisted objects, 
thermal (in hot objects)  
kinetic (moving objects)

Question 16

What is dissipation?

Answer 16

Energy transferred to the environment by heat, sound or light

Question 17

What is direct current?

Answer 17

Electrical charged pushed in ONE DIRECTION around a circuit

Question 18

What is alternating current?

Answer 18

where the direction of current keeps changing

Question 19

Which, A.C or D.C, supplies mains electricity

Answer 19

AC

Question 20

How to calculate power (voltage)?

Answer 20

Power = current x voltage

Question 21

What is power measured in?

Answer 21

Watts (W)

Question 22

What is energy transferred measured in?

Answer 22

Joules (J)

Question 23

How to calculate power (resistance)?

Answer 23

Power = current^2 x resistance

Question 24

How to calculate power?

Answer 24

Energy transferred/time

Question 25

How to calculate Kinetic energy?

Answer 25

KE = 1/2 x mass x velocity^2

Question 26

How to calculate GPE?

Answer 26

GPE = mass x gfs x height

Question 27

How to calculate weight?

Answer 27

Mass x gfs

Question 28

What is the unit for weight?

Answer 28

Newtons

Question 29

Which is a force: mass or weight?

Answer 29

Weight

Question 30

Does mass change at different places in the universe?

Answer 30

No, it is the same everywhere

Question 31

What is gravity and what factors affect it?

Answer 31

The force of attraction between two objects, mass and distance

Question 32

What are the units for GPE and KE?

Answer 32

Joules

Question 33

What is work done?

Answer 33

How much energy occurs when a force is used to move an object by a distance

Question 34

How do you calculate work done?

Answer 34

work done = force x distance

Question 35

How do you calculate power (work done)?

Answer 35

Power = work done/time

Question 36

Where is the magnetic field strongest?

Answer 36

Closer to the magnet's poles

Question 37

What direction do magnetic fields always point?

Answer 37

North to South

Question 38

What is the motor effect?

Answer 38

A current carrying wire in presence of a magnetic field will experience a force, wire has to be perpendicular

Question 39

How do you measure force (magnetic flux)?

Answer 39

Force = magnetic field strength x current x length

Question 40

What is magnetic flux density?

Answer 40

Magnetic field strength

Question 41

What is the magnetic field like inside a solenoid?

Answer 41

Strong and uniform

Question 42

What is the magnetic field like outside a solenoid?

Answer 42

Weak (cancel out)

Question 43

How do you increase the magnetic field strength?

Answer 43

Increase current, turn coil more times, use a shorter wire with the same amount of turns, add a soft iron core

Question 44

What is a fuse? Benefits and drawbacks?

Answer 44

A thin wire which melts to break the circuit when the current gets to high. Simple and cheap but has to be replaced

Question 45

What is newtons first law?

Answer 45

A resultant force is required to change the motion of an object, if resultant force is zero then a stationary object will remain stationary and a moving object will continue moving at the same velocity

Question 46

What is inertia?

Answer 46

Where there is no change on the movement of an object

Question 47

What is Newtons second law?

Answer 47

if a non-zero resultant force acts on an object, then it will cause it to accelerate. The size of a resultant force is directly proportional to the acceleration is causes

Question 48

How to measure force?

Answer 48

Force = mass x acceleration

Question 49

What is resultant force?

Answer 49

The overall force when two or more forces are acting on an object (in a direction)

Question 50

What is Newtons third law?

Answer 50

When 2 objects interact, the forces they exert are equal and opposite to each other. Equal in magnitude and opposite in direction.

Question 51

What does friction do?

Answer 51

Slows down moving objects

Question 52

What is upthrust?

Answer 52

Upwards fore in a fluid

Question 53

What is magnetic flux density measured in/?

Answer 53

Teslas

Question 54

Left hand rule

Answer 54

thumb - force index - field middle - current