CBSE Questions for Class 12 Medical Physics Current Electricity Quiz 2 - MCQExams.com

Constantan wire is used for making standard resistance, because it has
  • high melting point.
  • low specific resistance.
  • high specific resistance.
  • negligible temperature coefficient of resistance.
A dynamo develops $$0.5 A$$ at $$6 V$$. The energy which is generated in one second is
  • $$0.083 J$$
  • $$3 J$$
  • $$12 J$$
  • none of these
Copper metal is a:
  • good conductor of electricity
  • bad conductor of electricity
  • magnetic substance
  • bad conductor of heat
  • none of these
Name the instrument used to control the current in an electric circuit.
  • Rheostat
  • Voltmeter
  • Ammeter
  • Galvanometer
1 kilowatt hour $$=$$ ___________ .
  • $$10.6 \times 10^6$$Joule
  • $$3.6 \times 10^6$$Joule
  • $$30.6 \times 10^6$$Joule
  • $$3.6 \times 10^5$$Joule
The common dry cell produces a voltage of:
  • $$1.5 V$$
  • $$30 V$$
  • $$60 V$$
  • $$3 V$$
Insulators:
  • Conduct electricity
  • Do not conduct electricity
  • Conduct electricity only at low temperatures
  • Conduct electricity at room temperature
Which is/are the  insulators ?
  • wax
  • silver
  • ebonite
  • gold
The insulator of electricity is :
  • copper
  • silk
  • human body
  • acidulated water
A material that lets electricity to pass through it is called a/an:
  • electrical conductor
  • electrical insulator
  • electrical appliance
  • key
Fill in the blank.
Connecting wires in a electric circuit are made of .......
  • copper
  • silicon
  • tin
  • lead
Which of the follwing does not belong to the group formed by the others?
  • Iron
  • Tin
  • Glass
  • Steel
A cell is used to :
  • measure current in a circuit.
  • provide current in a circuit.
  • check current in a circuit.
  • prevent current in a circuit.
A material that does not allow electricity to flow through it is called a/an:
  • Electrical conductor
  • Electrical insulator
  • Electrical appliance
  • Key
If the resistance of a circuit is halved and the potential difference is kept constant, then the current will become
  • 4 times
  • 8 times
  • double
  • half
One Volt is equal to - 
  • 1 Joule
  • 1 Newton/Coulomb
  • 1 Joule/Coulomb
  • 1 Coulomb/Newton
A current of 300 mA is made to flow through a 6k$$\Omega$$ resistor. What is the potential difference across the resistor?
  • 1800V
  • 50V
  • 0.02V
  • 500V
An electrical appliance has a resistance of 4 ohms. When it is connected to a 12 V battery, the number of coulombs passing through it per second is
  • 1.2
  • 12
  • 0.3
  • 3
Consider a circuit which contains a resistance free battery and a single resistance $$R$$ . If a second resistance is added in parallel with $$R$$ .
  • The voltage across $$R$$ will decrease
  • The current through $$R$$ will increase
  • The total current drawn from the battery will increases
  • The power dissipated in $$R$$ will decrease current drawn from battery will increase
State True or False :
The materials, which do not allow electric current to pass through them easily, are poor conductors of electricity.
  • True
  • False
The potential difference across a $$6\Omega$$ resistor is $$12V$$. The current flowing in the resistor will be
  • 4A
  • 2A
  • 0.5A
  • 1A
You are given three bulbs 25 W, 40 W and 60 W . Which of them has the lowest resistance?
  • 25 watt bulb
  • 40 watt bulb
  • 60 watt bulb
  • Insufficient data
In 5s, a charge of 25C leaves a battery, and 100 J of energy are delivered to an outside circuit. What is the potential difference across the battery?
  • 20V
  • 125V
  • 4V
  • 8V
An electric iron is rated at 3kw. Electrical energy costs Rs. 4 per kwh. What is the cost of using the iron for 5 hours? 
  • Rs.12
  • Rs. 20
  • Rs.150
  • Rs. 60
The unit of e.m.f. of a cell is:
  • dyne
  • volt
  • ampere
  • joule
Which among the following is measured in Kilowatt hour?
  • Energy
  • Power
  • Resistance
  • Current
Which one of the following substances are used to make electric switches and switch boards?
  • Conductors
  • Insulators
  • Semiconductors
  • None of the above
A substance that allows electricity to pass through it, is called ______
  • electrical conductor
  • electrical insulator
  • electrical semiconductor
  • None of these
Two resistors of 60 ohms and 40 ohms are arranged in series across a 220 volt supply. How much heat is produced by this combination in half a minute?
  • 12860J
  • 152698J
  • 650J
  • 14520J
The maximum number of 40 W bulbs connected in parallel which can be lighted safely using a 240 V supply with a 5A fuse is.
  • 30
  • 45
  • 8
  • 44
Which among the following is the commercial unit of electrical energy?
  • Volt
  • Watt
  • Ampere
  • KWh
In 220 V A.C., the value of 220 represents:
  • Normal voltage
  • Effective voltage
  • Constant voltage
  • Peak voltage
The potential difference between the terminals of an electric heater is 220 V and the current is 5A. What is the resistance of the heater?
  • 22 ohm
  • 11 ohm
  • 44 ohm
  • 1100 ohm
How much electrical energy is transferred per second by a 4V; 0.5A lamp?
  • 20 J/S
  • 2 J/S
  • 6.8 J/S
  • 4.8 J/S
An electric cell does 5 joules of work in carrying 10-coulomb charge around the closed circuit. The electromotive force of the cell is :
  • 2 volt
  • 0.5 volt
  • 4 volt
  • 1 volt
A material that does not allow electricity to flow through it is called a/an-
  • Electrical appliance
  • Electrical conductor
  • Electrical Insulator
  • None of these
E.M.F. ofa cell is expressed in
  • volt
  • volt per metre
  • volt metre
  • none of these
State whether given statement is True or False
Glass is a good insulator.
  • True
  • False
Electric current can flow through-
  • Silver
  • Copper
  • Iron
  • All of these
The EMF of a cell can be defined as:
  • Work done in taking a unit positive charge once round the circuit
  • The open circuit voltage of the cell
  • The terminal voltage when the current is zero
  • All the above
A material that lets electricity to pass through it is called a/an-
  • Electrical appliances
  • Electrical conductor
  • Electrical insulator
  • None of these
Which of the following does not belong to the group formed by the others?
  • Iron coin
  • Wooden ruler
  • Silver cup
  • Copper wire
State whether given statement is True or False.
Silver is a good conductor of electricity.
  • True
  • False
What is the driving force in a working Electrical Circuit?
  • Voltage Difference
  • Current
  • Temperature difference
  • Chemical Imbalance
Find the odd man out.
Copper, Aluminium, Iron, Wood, Brass.
  • Wood
  • Aluminium
  • Iron
  • Brass
Find odd one out:
Copper, Salt water, Cotton, Human body.
  • Human body
  • Cotton
  • Salt water
  • Copper
A bulb uses 5000J of energy in 10s, calculate its power.
  • 50 $$J/s$$
  • 500 $$Watts$$
  • 5 $$Watts$$
  • 600 $$J/s$$
Given a current carrying wire of non-uniform cross-section. Which one of the following is constant through out the length of wire ?
  • Current only
  • Current and drift speed
  • Drift speed only
  • Current, electric field and drift speed
________are substances which do not allow electricity to pass through them.
  • Insulators
  • Conductors
  • Semi-conductors
  • None of these
Find odd man out
Plastic, Rubber, Glass, Silver
  • Glass
  • Rubber
  • Silver
  • Plastic
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