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WorksheetsCurrent electricity
Total questions: 66
Worksheet time: 1hrs 10mins
Surface tension is due to
frictional force between molecules
cohesive force between molecules
adhesive force between molecules
gravitational force
A galvanometer can be converted into a voltmeter by connecting a
high resistance in parallel
high resistance in series
low resistance in parallel
low resistance in series
- Kirchhoff's junction rule is a reflection of
Conservation of current density vector
Conservation of charge and no accumulation of charge at the the junction
the momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction
Conservation of energy
A rigid body is rotating about an axis. to stop the rotation, we have to apply........
pressure
force
momentum
torque
A car is moving on a banked track of radius 10m with a constant speed of 10 m/s. The angle of banking is ........
(g = 10 m/s2)
900
600
450
300
When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Select correct statement about the directions of its angular velocity and angular acceleration.
Angular velocity upwards, angular acceleration downwards
Angular velocity downwards, angular acceleration upwards
Both angular velocity and angular acceleration upwards
Both angular velocity and angular acceleration downwards
The study of properties of fluids in motion is called
Fluids Study
Fluids statics
Fluids dynamics
None
The equation 𝐹 = 6𝜋𝜂𝑟𝑣 is called:
Newton’s law
Stoke’s law
Ohm’s law
Lenz’s law
The maximum constant velocity of an object falling vertically downward is called:
Final velocity
Terminal velocity
Instantaneous velocity
Average velocity
Turbulent flow is
Unsteady and regular
Steady and regular
Unsteady and irregular
Steady and regular
According to equation of continuity, A1V1 = A2V2 = constant. The constant is equal to:
Flow rate
Volume of fluid
Mass of fluid
Density of fluid
Velocity of fluid increases where the pressure is:
Low
High
Constant
zero
A man standing near a fast moving train may fall.
Away from the train
Towards the train
On the same place
In the direction of train
If cross-sectional area of pipe decreases, the speed of fluid must increase according to:
Continuity equation
Bernoulli's equation
Torricelli's theorem
Venture relation
What does fluid means?
To fall
To flow
To oppose
To rising
Which of the following best explains an electric current?
An electric current is the flow of positive charges in a circuit.
An electric current is the flow of atoms in a circuit.
An electric current is the flow of electrons in a circuit.
An electric current is the flow of neutrons in a circuit.
Which of the following statements is correct about electrical insulators?
They do not contain any atoms.
Their protons are not allowed to move about freely.
The electrons are not able to move about freely.
They are good at conducting heat only.
Which of the following substances is the best conductor of electricity?
Glass
Wood
Water
Mercury
Which of the following is the SI unit for electric current?
Ohm
Watt
Ampere
Volt
An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?
Nichrome conducts more current than copper, so more heat can be generated.
Nichrome has higher resistance than copper, so more heat can be generated.
Nichrome has higher voltage than copper, so more heat can be generated.
Nichrome are cheaper than copper, so it is more economical.
Which of the following materials is used in a light bulb to produce heat and light?
Nichrome
Copper
Tungsten
Steel
Which of the following electrical appliances does not make use of a variable resistor?
Volume controls in radio
Dimmers in cinemas
Speed control of a toy car
Electric kettle
A higher resistance in a circuit causes a _____________.
higher voltage
larger current
smaller current
lower voltage
Which of the following is not a source of electrical energy?
ammeter
dry cell
mains
dynamo
The instrument that measures electric current is called ___________.
a resistor
a voltmeter
an ammeter
an electrometer
Which of the following charge pairs would repel each other? (Choose all that apply)
positive and negative
negative and negative
positive and positive
negative and positive
Determine how the following factor would affect the amount of resistance: longer wire
increase resistance
decrease resistance
would not affect resistance
Determine how the following factor would affect the amount of resistance: insulating material
increase resistance
decrease resistance
would not affect resistance
Determine how the following factor would affect the amount of resistance: thick wire
increase resistance
decrease resistance
would not affect resistance
What type of circuit is this?
Series
Parallel
Simple
In a series circuit, how is the brightness of a light bulb affected when another bulb is connected?
It gets brighter
It stays the same
It gets dimmer
It goes out
Which of the following materials that is not a good electrical conductor?
Two unlike charges_________
Attract each other
Neutralize each other
Repel each other
Have no effect on each other
Which is the electrical symbol for a wire?
Which is the electrical symbol for one battery?
