electricity tests

1 The SI unit of charge is –

The SI unit of electric potential is –

The SI unit of resistance is –

The SI unit of electric current is –

The SI unit of electrical energy is –

The consumed electrical energy is measured in –

A wire of resistance R is cut into five equal parts. These parts are then connected in parallel. 
If the equivalent resistance of the combination is R′, what is the ratio R′/R?

Which of the following does not represent electric power in an electric circuit?

A bulb is rated 200V:100W. When it is operated at 110V, what will be the power consumed by it?

Q The SI unit of electromotive force (EMF) is –

Joule per Coulomb (J/C) is equal to –

In an electric circuit, electric current is measured using 

At a given time, the heat produced in a conductor of fixed resistance is

If the potential difference between two points in a circuit is V , and a current I flows through 
it for time t, then the work done is – ?

Which instrument measures electrical resistance?

When a soap bubble is electrically charged, then –

1 Volt is equal to?

An M.C.B. (Miniature Circuit Breaker), which cuts off the power supply in case of a short circuit, works on the principle of –

The device used to change the speed of an electric fan is –

In an electric mercury lamp, there is 

If a resistor wire is stretched (made longer), its resistance—

If the electrical resistance of a material drops to zero, what is that material called?

The electrical resistance of a conductor is independent of –

60.What is the purpose of a choke in a fluorescent lamp?

The most commonly used substances in a fluorescent tube (lamp) are

The device that converts alternating current (AC) into direct current (DC) is called –

The semiconductor chip used in an integrated circuit is made of –

What is the source of electrical energy in an artificial satellite?

What is the typical temperature of the filament of a glowing electric bulb?

Mica is —

Which metal is used to generate electricity?

What is the order of magnitude of the electrical resistance of the (dry) human body?

What is usually marked on a commonly used fluorescent tube light?

In a tube light, approximately how much portion of the consumed energy is converted into light?

Which of the following household appliances is based on the heating effect of electric current?

A 100-watt electric lamp is used for 10 hours in one day.
How many units of energy does the lamp consume in one day?

If a 100-watt electric bulb burns for 10 hours, then at the rate of ₹5 per unit, what will be the electricity cost?

Kilowatt-hour is the unit of:

Kilowatt-hour is the unit of:

The electricity consumption bill is based on the measurement of which of the following?

1. Wattage

2. Voltage

3. Ampere

4. Ohm

Choose the correct answer from the codes given below:

If a 100-watt electric bulb is used for 10 hours, what will be the electricity consumption?

Who invented the lightning conductor?

Lightning conductors are made of –

Read the following Assertion (A) and Reason (R) and choose the correct option:

Assertion (A): Lightning conductors protect buildings from destruction.
Reason (R): They send the charge to the earth.

Codes:

The filament of an electric bulb glows when electric current flows through it,but the wires carrying current to the filament do not glow. The reason is:

Which one of the following non-metals is not a poor conductor of electricity?

Nichrome wires are used as heating elements because:

Tungsten is used in the filament of an electric bulb because it has:

Why is air completely removed from an electric bulb?

A loud sound is heard when a bulb is broken because–

Which combination of properties is essential for a fuse wire used in common electrical applications?

 A commonly used safety fuse wire is made from:

The working principle of a fuse is based on:

A fuse is installed in the main electricity supply as a safety device. Which of the following statements about an electric fuse is correct?

A fuse wire is identified by which of the following characteristics?

The fuse wire used in domestic electrical appliances is made of a metal that has–

A fuse wire is used for:

A wire has a length of L meters. It is stretched so that its new length becomes 2L meters. Now, the resistance of the wire will become 

The SI unit of specific resistance (resistivity) is –

What does Ohm's Law define?

If the radius of a wire is halved, its resistance will:

"The potential difference across the ends of a conductor is directly proportional to the current flowing through it." This is the law of:

In homes, fans, bulbs, etc. are connected in:

The unit of resistance is:

A conductor has a resistance of 440 ohms. If it is connected to a 110-volt source, how much current will flow through it?

The algebraic sum of currents meeting at a point in a circuit is:

What is the resistance of an ideal voltmeter?

 No electric current flows between two connected charged objects if they are at –

Which of the following is the unit of electric current?

The force between two electric charges is related to—

If the distance between two electric charges is halved, the electric force between them will become—

Like charges exhibit—

When an ebonite rod is rubbed with cat's skin, the ebonite rod—

Charging of objects occurs due to the transfer of—

You are traveling in a car. If lightning is about to strike from the sky, then to stay safe—

"The force between two stationary charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them."

In an electric circuit, the work done in moving a unit positive charge from one point to another measures the

Metals are good conductors of electricity because—

Metals are good conductors of electricity because—

Which of the following is the best conductor of electricity?

Which of the following is not a semiconductor?

Substances that do not have free electrons in their normal state, but can provide free electrons under special conditions like high temperature or by adding impurities, are called—

What is the effect of increasing temperature on the electrical resistance and electrical conductivity of conductor materials?

When a glass rod is rubbed with silk, the rod—

The total charge on a charged conductor resides—

An electric motor converts 

89.The device which converts electrical energy into mechanical energy is called 

What is the unit of magnetic flux?

In a dynamo or generator, the transformation is of:

What is the device called that generates electric current?

Electromagnetic induction is the phenomenon—

In household wiring, electrical appliances are connected—

A basic difference between an alternator (AC generator) and a DC generator is:

During a short circuit, the value of electric current in the circuit.

Which of the following correctly describes the magnetic field near a long current-carrying wire?

Inside a straight current-carrying conductor, the magnetic field —

Which of the following property of a proton changes when it moves freely in a magnetic field?

A positively charged particle (α-particle) projected towards the west is deflected towards the north due to a magnetic field. What is the direction of the magnetic field?

A rectangular coil made of copper wire is rotating in a magnetic field. After how much rotation does the direction of induced current in the coil change?

The frequency of AC (alternating current) used in domestic electricity supply is:

In India, how often does the AC (alternating current) change its direction?

What type of electric current does a dynamo produce?

Which of the following is not a magnetic material?

109.Who discovered the magnetic effect of electric current?

Which of the following statements is NOT true?

The direction of current and the associated magnetic field can be determined using -

Which of the following scientists experimentally proved that a magnetic field exerts a force on a current-carrying conductor?

The direction of the force on a current-carrying conductor in a magnetic field is determined by which rule?

A generator with a commutator produces:

The direction of force on a current-carrying conductor in a magnetic field is determined by which rule?

A generator with a commutator produces—

The electric supply provided in our homes is—

The live wire is usually of which color?

 Switches are connected to which wire?

 In household wiring, there are three wires — Live (hot), Neutral, and Earth. The usual color coding of these three wires is:

Which of the following statements about a bar magnet is correct?

Which of the following cannot be detected using a magnetic compass?

In a uniform magnetic field, the field lines should be:

122.If a magnet has a third pole, what is that third pole called?

The Earth acts as a giant magnet. In which direction is its magnetic field spread?

What is the Curie temperature of iron?

A magnet is an essential part of which of the following household appliances?

What is the value of the angle of dip (magnetic inclination) on the magnetic equator?

Lenz's Law is a law of

What is a transformer?

The working principle of a transformer is based on –

Which of the following materials is most suitable for making the core of a transformer?

An electric motor works on which of the following principles?

The working principle of a dynamo (electric generator) is based on:

The working principle of a dynamo is related to which of the following?

134.Which of the following is based on the laws of electromagnetic induction?

136.Fleming’s Left-Hand Rule indicates the direction of

In which direction does a magnetic needle point?

The process by which a metal is made non-magnetic is called–

 The ratio of magnetic flux density to the strength of magnetic field in a medium is called–

140.A stationary magnet always shows–

141.The material from which a permanent magnet is made is–

In which direction does a freely suspended magnetic needle settle?

In which direction does the needle of a magnetic compass point?

144.Which of the following is a non-magnetic (non-magnetizable) substance?

145. Steel is difficult to magnetize because of its–

146.A freely suspended magnet always comes to rest in the–

147.Which of the following is paramagnetic in nature?

Which of the following is electrically non-magnetic (non-magnetic material)?

149.The angle between the magnetic meridian and the geographic meridian is called –

Which of the following is diamagnetic?

A strong magnet —

The angle made by a freely suspended magnetic needle at its center of gravity with the horizontal is called:

A magnetic substance can be magnetized by –

The magnetic effect of electric current was first observed by–

What is the value of the angle of dip (naman kon) at the poles?

The axis of a freely suspended magnetic needle makes an angle with the geographic axis of –

Permanent magnetism can be done in which of the following materials?

Temporary magnets are made of:

Why are electromagnets made of soft iron?

If a magnet is divided into two parts, then:

Where is the attractive force of a magnet the greatest?

Where is the attractive force of a magnet the weakest?

Which of the following statements is false?

165.The unit of magnetic field is:

The unit of magnetic flux is:

Which of the following is not a ferromagnetic material?

Which of the following is a paramagnetic substance?

169.What are the numerous microscopic structures of atoms inside ferromagnetic substances called?

 1 डोमेन (Domain) में परमाणुओं की संख्या होती है-

In the process of electrolysis, what occurs at the cathode?

When 96500 coulombs of electric current is passed through a solution of CaSO₄, how much Cu is liberated?

Which of the following will not conduct electricity?