WorksheetsSS3 FIRST TERM PHYSICS TEST
Total questions: 44
Worksheet time: 22mins
In which of the following media would sound travel fastest?
Wood
Water
Iron
Mercury
Which of the following factors does not affect the capacitance of a parallel plate capacitor?
Nature of the surface of the plates
Distance of separation between the plates
Area of the plates
Nature of the insulating material between the plates
The equivalent capacitance of a 3 μF capacitor and a 6 μF capacitor connected in parallel is ______
(a) 9.0 μF
(b) 2.0 μF
(c) 18.0 μF
(d) 3.0 μF
A cell of e.m.f. 1.5 V and internal resistance 1.0 Ω is connected to two resistors of resistances 2.0 Ω and 3.0 Ω in series. Calculate the current through the resistors.
0.25 A
0.30 A
0.35 A
0.50 A
Two bodies each carrying a charge of 2.0 × 10⁻¹⁰ C are 5 cm apart. Calculate the magnitude of the force between the charges. [1 / 4πε₀ = 9.0 × 10⁹ Nm²C⁻²]
1.44 × 10⁻⁷ N
7.20 × 10⁻⁹ N
7.20 × 10⁻¹¹ N
1.44 × 10⁻¹¹ N
Which of the following is a unit of the time rate of flow of electric charges?
Coulomb
Ampere
Volt
Watt
A wire 1.0 m long and with cross-sectional area 2.0 × 10⁻⁷ m² has a resistance of 0.1 Ω. Calculate the electrical conductivity of the wire.
2.0 × 10⁷ Ω⁻¹ m⁻¹
5.0 × 10⁷ Ω⁻¹ m⁻¹
20 × 10⁶ Ω⁻¹ m⁻¹
5.0 × 10⁸ Ω⁻¹ m⁻¹
A voltmeter is a device that ____
(c) has a very high resistance
(a) has a very low resistance
(b) generates electric current
(d) measures temperature
Which of the following is not part of the electromagnetic spectrum?
X-rays
Microwave
Infrared radiation
Alpha rays
Which of these is the greatest in terms of wavelength in the electromagnetic spectrum?
Radio wave
Infrared
Visible Light
Gamma ray
Which of these electromagnetic waves has the highest frequency?
Radio wave
Infrared
Visible Light
Gamma ray
A satellite in circular motion around the earth does not have ____
(a) a uniform velocity
(b) a uniform speed
(c) a constant acceleration
(d) a constant force
To convert a galvanometer into a voltmeter we connect a _____ in _____ to it.
shunt/parallel
multiplier/series
shunt/series
multiplier/parallel
A galvanometer of internal resistance 50 Ω and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950 Ω to it. Calculate the maximum voltage that can be read by the voltmeter.
20 V
30 V
38 V
40 V
The correct relationship between 'G' and 'g' in a gravitational field (where the symbols have their usual meanings) is given by the equation ____
g = GM/R
g = GM/R²
g = GM²/R
g = GM²/R²
The unit of capacitance is ____
(a) Farad
(b) Henry
(c) Ohm
(d) Watt
An ammeter with a full scale deflection of 10 mA has internal resistance 0.5 Ω. Calculate the resistance of the shunt required to adapt it to read up to 3 A.
0.0017 Ω
0.0130 Ω
0.0250 Ω
0.1000 Ω
The resistivity, ρ, of a material of length l, cross-sectional area A, and resistance R, is given by the equation: ______
ρ = RA/l
ρ = 1/RA
ρ = Rl/A
ρ = R/A
Which of the following properties is not applicable to X-rays? They ____
travel in straight lines
travel with the speed of light
are deflected by magnetic field
affect photographic film
Which of the following properties is an advantage of a lead-acid accumulator over an alkaline accumulator?
Possesses low internal resistance
can be recharged
Has shorter life span
Possesses higher emf
The direction of motion of a current-carrying conductor placed within the opposite poles of a magnet is determined using ____
Fleming's left-hand rule
Fleming's Right-hand rule
Ampere's rule
Maxwell corkscrew rule
Which of the following devices works on the principle of electromagnetic induction?
Carbon microphone
Electric heater
Moving iron ammeter
Simple motor
The mass of the earth is 6.0 × 10^24 kg and that of the moon is 7.0 × 10^22 kg. If the distance between them is 4.0 × 10^8 m, calculate the force of attraction between them. [G = 6.7×10−11Nm2kg−2 ]
1.8 × 10^5 N
1.8 × 10^10 N
1.8 × 10^15 N
1.8 × 10^20 N
The angle which the direction of the earth magnetic field makes with the horizontal at a place is known as _____
angle of contact
angle of dip
angle of declination
magnetic meridian
Three capacitors each of capacitance 1.5 μF are connected in series. The total capacitance in the circuit is ____
2.0 μF
1.5 μF
0.6 μF
0.57
A radio wave has a wavelength of 150 m. If the velocity of the wave is 3 × 10^8 ms^-1, calculate the frequency of the wave.
4.5×1010Hz
5.0×109Hz
4.5 × 10^9 Hz
2.0 × 10^6 Hz
Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?
Ebonite rod
Gold leaf Electroscope
Proof planes
The electrophorus
A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately ____
north-south
south-west
north-east
south-east
The full meaning of the acronym LASER is:
Light Amplification by Stimulated Emission of Radiation
Light Absorption by Stimulated Emission of Rays
Laser Amplification by Stimulated Emission of Radiation
Light Amplification by Spontaneous Emission of Radiation
2a. A machine is defined as:
A device that makes work easier by changing the direction or magnitude of a force.
A tool used only for entertainment purposes.
A living organism that performs tasks.
A natural object found in the environment.
The velocity ratio of a machine is 5. What does this statement mean?
The distance moved by the effort is 5 times the distance moved by the load.
The machine multiplies force by 5 times.
The machine has an efficiency of 5%.
The load moves 5 times faster than the effort.
2c. A Screw-Jack, 25% efficient and having a screw of pitch 0.4 cm is used to raise a load through a certain height in the process, the handle turns. What is the efficiency of the screw-jack?
25%
50%
10%
75%
3a. The terms (i) anode and (ii) cathode, as used in electrolysis, refer to:
(i) The positive electrode and (ii) the negative electrode
(i) The negative electrode and (ii) the positive electrode
(i) The solution and (ii) the electrode
(i) The electrolyte and (ii) the solvent
List the ions involved in an electrolytic process with dilute tetraoxosulphate (VI) acid as electrolyte.
H⁺ and SO₄²⁻ ions
Na⁺ and Cl⁻ ions
K⁺ and NO₃⁻ ions
Ca²⁺ and CO₃²⁻ ions
State the two laws of Michael Faraday as regards electrolysis.
The two laws of Michael Faraday as regards electrolysis are: (1) The mass of a substance deposited or liberated at an electrode is directly proportional to the quantity of electricity passed through the electrolyte. (2) The mass of different substances deposited or liberated by the same quantity of electricity are proportional to their chemical equivalent weights.
The two laws of Michael Faraday as regards electrolysis are: (1) The current is directly proportional to the voltage applied. (2) The resistance is inversely proportional to the mass deposited.
The two laws of Michael Faraday as regards electrolysis are: (1) The temperature of the electrolyte determines the mass deposited. (2) The pressure affects the quantity of electricity required.
The two laws of Michael Faraday as regards electrolysis are: (1) The color of the electrode changes with the amount of electricity. (2) The volume of gas produced is proportional to the electrode size.
Electromotive force is best described as:
The energy supplied per coulomb of charge by a source in driving charge around a complete circuit.
The force that moves a magnet in a magnetic field.
The resistance offered by a conductor to the flow of current.
The rate at which work is done in moving a charge.
4b. Two sources of electromotive force are:
Chemical cells and solar cells
Resistors and capacitors
Transformers and inductors
Switches and wires
A chemical cell of emf 12 V and internal resistance 10.2 ohms is connected in series with an ammeter, a plug key and an external load of resistance 12 ohms. What is the current passing through the circuit?
0.54 A
1.0 A
0.75 A
0.25 A
5a. Which of the following lists includes two objects used in (i) sports and (ii) warfare that may be considered projectiles?
(i) Football, (ii) Arrow
(i) Tennis ball, (ii) Sword
(i) Basketball, (ii) Shield
(i) Hockey stick, (ii) Tank
The horizontal range, R of a projectile is given by the expression: R = (U² sin 2θ) / g. What does each parameter in the equation represent?
U is the initial velocity, θ is the angle of projection, g is acceleration due to gravity, R is the range.
U is the final velocity, θ is the time of flight, g is the mass, R is the height.
U is the acceleration, θ is the distance, g is the force, R is the speed.
U is the mass, θ is the velocity, g is the angle, R is the time.
At what value of θ will R be maximum?
R will be maximum when θ = 45 degrees.
R will be maximum when θ = 30 degrees.
R will be maximum when θ = 60 degrees.
R will be maximum when θ = 90 degrees.
5d. Doping refers to the process of intentionally adding impurities to a pure semiconductor to change its electrical properties.
The process of intentionally adding impurities to a pure semiconductor to change its electrical properties.
The process of removing all impurities from a semiconductor to make it pure.
The process of heating a semiconductor to increase its conductivity.
The process of coating a semiconductor with a metal layer.
6b. Identify the two differences between an intrinsic and an extrinsic semiconductor.
Intrinsic semiconductors are pure, while extrinsic semiconductors are doped; intrinsic have equal electrons and holes, extrinsic have unequal electrons and holes.
Intrinsic semiconductors are doped, while extrinsic semiconductors are pure; intrinsic have unequal electrons and holes, extrinsic have equal electrons and holes.
Intrinsic semiconductors are metals, extrinsic semiconductors are insulators; intrinsic have more electrons, extrinsic have more holes.
Intrinsic semiconductors conduct at low temperature, extrinsic semiconductors conduct at high temperature; intrinsic have no charge carriers, extrinsic have many charge carriers.
6c. Four applications of semiconductors are:
Rectifiers, transistors, solar cells, LEDs
Batteries, resistors, capacitors, inductors
Transformers, generators, motors, switches
Fuses, relays, circuit breakers, wires
