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WorksheetsRevising test - Grade 12
Total questions: 61
Worksheet time: 3hrs 2mins
Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is
F / 8
F / 4
4F
F/16
Approximately how much force would be generated by two charged objects held 2 m apart, if q1 has a charge of 3.0 C and q2 has a charge of 4.0 C?
0.5 N
1.5 N
3 N
6 N
Label the charges respectively:
+; +
+; -
-; -
-; +
A helium atom accelerates through large potential difference. The accelerating voltage might be 10×106 V. Find the kinetic energy.
For helium nucleus: m= 4*1.67*10^-27 kg
q = 2*1.6*10^-19 C
1*10^-5
3.2*10^-12
5*10^-8
12*10^-12
What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge?
2F
4F
6F
8F
Two capacitors X and Y of capacitances 2 F and 4 F respectively are connected in series with
a 12 battery. Which of the following statements is CORRECT?
The effective capacitance is 6 F.
Capacitors have the same charge of 36 C.
The potential difference across the capacitor X is 8 V.
The potential difference across the capacitors Y is 12 V.
Three capacitors 1.0 μ F, 1.5 μ F and 2.0 μ F are connected in series. What is the equivalent
capacitance of the capacitors?
4.50 μ F
2.17 μ F
0.46 μ F
0.25 μ F
What is the unit of measurement for resistance?
Voltage
Ampere
Watts
Ohms
What is the equivalent or total resistance (Re) across this circuit?
3 kΩ
10 kΩ
13 kΩ
18 kΩ
What is the equivalent resistance of the resistor network in the picture?
11 ohms
41 ohm
18 ohm
20 ohm
Find the value of I1, I2 and I3.
-0.566A, 1.29A, -1.91A
-1.29A, -0.566A, 1.91A
1.29A, -0.566A, -1.91A
1.91A, 0.566A, 1.29A
Calculate Vth for the given circuit.
5.54 V
3.33 V
6.67 V
3.67V
What would happen is a north pole of a magnet came close to a north pole of another magnet?
they would be attracted to each other
they would be repelled from each other
Are the magnetic field lines in the picture correct?
Yes, because they point from north to south.
No, because they point from north to south (they're supposed to go the other way).
Yes, because the North pole is on the left in all pictures.
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
Using the right hand grip rule, A represents the direction of the
current
magnetic field
A positive charge is moving to the left through a magnetic field that is going into the page. What is the direction of the force on the charge?
Up
Down
Into the page
Out of the page
No Force
A proton moving at a speed of 2.0 ×107m s−1 enters a uniform magnetic field perpendicular to the field. If the magnetic flux density is 2.5 Tesla, what is the magnetic force acting on the proton?
3.2 ×10−12N
4.0 ×10−12N
7.5 ×10−12N
8.0 ×10−12N
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)?
= 0.18 N
= 0.18 T
= 0.18 Cm
= 0.18
1) A solenoid with 500 turns, 0.10 m long, carrying a current of 4.0 A and with a radius of 102 m will have what strength magnetic field at its center?
31 x 10 – 4 T
62 x 10 – 4 T
125 x 10 – 4 T
250 x 10 – 4 T
1) A superconducting wire carries a current of 10^4 A. Find the magnetic field at a distance of 1.0 m from the wire.
2 x 10^-3 T
8 x 10^-3 T
1.6 x 10^-2 T
3.2 x 10^-2 T
A uniform 4.5 T magnetic field passes perpendicularly through the plane of wire loop 0.10 m2 in area. What flux passes through the loop?
5.00 Tm2
0.450 Tm2
0.250 Tm2
0.135 Tm2
A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter.
increasing the number of turns on the coil
increasing the speed of the magnet
increasing the strength of the magnet
all of the above
According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
enhance the effect which produces it
produce a greater heating effect
produce the greatest voltage
oppose the effect which produces it
The transformer is a device used to .......... the value of a voltage.
steady
resist
change
anchor
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
480V
30V
20V
450V
A rectangular coil with resistance 6 Ω, having a length L=40cm, and width w=15 cm, as shown in figure. The coil moves into a uniform magnetic field Bin=0.8T with a constant velocity V=0.5m/s. The magnitude and the direction of current induced in the coil as the coil enters the magnetic field is
0.03 A counterclockwise
0.03 clockwise
0.01 A counterclockwise
0.01 A clockwise
As the binding energy of a nucleus increases, the
energy required to separate the nucleus into
nucleons _____.
decreases
increases
stays the same
becomes negative to positive
The atom 714𝑁
has a mass of 14.0031 𝑢.
The mass defect equals ______.
0.1089 u
0.2026 u
0.2341 u
0.0003 u
Choose the underlined part that needs correction
He bought a lot of books, none of them he has ever read.
bought
none of
them
has ever read
_____→137 56 Ba + 0 −1 e
X → 86Rn222 + 2He4
Cobalt 60 has a half-life of 5.25 years (1.66 * 108). Given 1 mg of the substance, find
The number of atoms in the sample.
1019
1020
1021
1022
Cobalt 60 has a half-life of 5.25 years (1.66 * 108). Given 1 mg of the substance, find The decay constant.
4*10-9
3*10-9
2*10-9
1*10-9
The number of disintegrations per second if N= 1019 atoms and λ= 4*109
1*1010
2*1010
3*1010
4*1010
What is the major drawback to fission power?
Radioactive Waste
CO2 Emissions
SO2 Emissions
All of the Above
The nuclear energy is measured as........
MeV
MW
Curie
None of the above
How did you find this year's physics class? I'm all ears to listen!
