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Revision C4,5&6

Total questions: 42

Worksheet time: 46mins

Name
Class
Date
1.

A substance of mass 2.0 kilograms is originally in the solid state. The graph below represents the temperature of the substance as heat is added to it. During which interval is the average kinetic energy of the molecules of the substance unchanged?

a)

BC

b)

CD

c)

AB

d)

AC

2.

Zara is warming a pot of soup on the stove. How is the motion of the particles in the soup different after the temperature of the soup increases?

a)

They move faster on average.

b)

They have less average energy.

c)

They move less freely.

d)

They vibrate and are close together

3.
If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? 
a)
-80,371.2 J
b)
44,938.6 J
c)
80,371.2 J
d)
112,575.9 K
4.
What would be the effect on the particles if more heat is supplied to the system?
a)
They would slow down
b)
They would stop moving
c)
They would speed up
d)
There would be no effect
5.
A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of  0.10 J/g°C, what is the mass of the iron sample?
a)
25 g
b)
30 g
c)
20 g
d)
50 g
6.
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?
a)
12.82 °C
b)
24.12°C
c)
351 °C
7.
You have 20 g of water with specific heat of 4.18 J/gŸ°C.  The temperature changes from 25° C to 20° C.  How much heat energy (Q) moves from the water to the surroundings?
a)
418 Joules
b)
209 J
c)
83 J
d)
4.18 J
8.

Two objects have different temperatures. Object A has a temperature of 42 degrees and Object B is 37 degrees. Which direction should the energy transfer between Objects A and B?

a)

From Object A to Object B

b)

From Object B to Object A

c)

Energy will not transfer

d)

Energy will transfer both directions

9.
What about gasses can be measured?
a)
Pressure and Volume
b)
Temperature, Volume, and Pressure
c)
Volume and Temperature
d)
Pressure, Temperature, Volume, and Moles
10.
At STP, what is pressure in atmospheres?
a)
1 atm
b)
10 atm
c)
0 atm
d)
100 atm
11.
Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.
a)
7.18 L 
b)
7.81 L
c)
4.63 L
d)
4.36 L
12.
Determine the Kelvin temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure. 
a)
0 K 
b)
107 K 
c)
207 K 
d)
307 K 
13.
What is the variable for this number 22.4 L
a)
P
b)
T
c)
n
d)
V
14.

Which is a correct unit for R?

a)

L.atm/mol.k

b)

L.atm

c)

mmHg/mol.K

d)

L.atom/mol

15.
In the ideal gas law, which variable represents the gas constant?
a)
n
b)
R
c)
T
d)
V
16.

At a given temperature T and pressure P, a person's lung holds a set volume of V of air. Given that air is roughly 20% oxygen, how many moles of oxygen are in his lungs?

a)

0.2*(PT/RV)

b)

5*(PT/RV)

c)

0.2*(PV/RT)

d)

5*(PV/RT)

17.

Shown below are four mercury barometers of the same height (all four barometer tubes measure one meter from the tube opening to rounded top). Which barometer shows the greatest external pressure?

a)

Barometer C

b)

Barometer D

c)

Barometer A

d)

Barometer B

18.
The capacitance of a parallel-plate capacitor can be increased by: 
a)
increasing the charge 
b)
decreasing the charge 
c)
increasing the plate separation
d)
decreasing the plate separation 
19.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
20.
In the capacitor, the dielectric can be made out of all sorts of ---------- materials and the plates are made of a -------------- material.
a)
conductive, insulating 
b)
conductive, conductive
c)
insulating, conductive
d)
insulating, insulating
21.

With respect to the capacitor, which relationship is true? •

a)

C = Q×V

b)

V = C×Q

c)

V = Q/C

d)

Q = C/V

22.

A 9.0-V battery is connected between two parallel metal plates 4.0 mm apart. What is the magnitude of the electric field between the plates?

a)

2.3 x 103 N/C

b)

9.0 N/C

c)

2.3 N/C

d)

0.75 x 10-6 N/C

23.

Two capacitors with CA greater than CB and are connected in series with a battery. Which of the following is true?

a)

There is more charge stored on CA.

b)

There is more charge stored on CB.

c)

There is the same charge stored on each capacitor.

d)

There is the same potential difference across both capacitors.

24.

What is the equivalent capacitance between points a and b? All capacitors are 1.0 µF.

a)

4.0 µF

b)

17 µF

c)

0.6 µF

d)

0.25 µF

25.

A simple capacitor of capacitance C is produced using 2 parallel plates of area, A, and separation, d. (Air is used as the dielectric material).

If the separation of the plates is halved to d/2 and the area of both plates is doubled, what is the new capacitance?

a)

C4\frac{C}{4}

b)

C2\frac{C}{2}

c)

4C4C

d)

2C2C

26.
Magnets can interact without touching.
a)
True
b)
False
27.
A beam of electrons travels at 6.0×106 m/s through a uniform magnetic field of   6.5×10−1 T at right angles to the field. How strong is the force acting on each electron? 
a)
=  6.25×10−13 N
b)
=  −6.25×10−13 N
c)
=  −6.25×10−10 N
d)
=  −6.25×10−13 M
28.
A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT: F=I.L.B
a)
= 0.18 N
b)
= 0.18 T
c)
= 0.18 Cm
d)
= 0.18 
29.
Magnetic poles that are unlike ________and magnetic poles that are alike ___________.
a)
run; stay
b)
attract; repel
c)
stay; repel
d)
repel; attract
30.
What is a magnetic field?
a)
purple lines with arrows
b)
area of magnetic force around a magnet
c)
it's like a really big football field
d)
area of a magnet around a magnetic force
31.
The SI unit of magnetic field is 
a)
weber
b)
guass
c)
tesla
d)
farad
32.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
33.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
34.
Electromagnetic induction is change in ___________________. 
a)
surface area
b)
magnetic poles
c)
magnetic flux
35.
Voltage can be induced in a wire by
a)
a. moving the wire near a magnet.
b)
b. moving a magnet near the wire.
c)
c. changing the current in a nearby wire.
d)
d. all of these
36.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear 
b)
The magnet would explode 
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
37.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 
a)
quadruples
b)
doubles
c)
is the same
d)
halves
38.
___ Law says that the Induced current is proportional to the change of magnetic flux 
a)
Lenz'
b)
Faraday's
c)
Ampere's
39.

Which description best applies to Lenz's Law?

a)

An induced current occurs when a magnet passes through a tube.

b)

When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.

c)

The direction of an induced current is such to align with the change that created it.

d)

A magnet is a tube is always slowed by its magnetic field.

40.

If a transformer reduces voltage, it is called a....................... transformer.

a)

step left

b)

step right

c)

step up

d)

step down

41.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

42.

Calculate potential difference in the secondary coil based on the information given below.


Vp = 240 V

Np = 20

Ns = 125

Vs ?

a)

1500

b)

500

c)

1000

d)

2000

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