Practice Test

Q1) A device that measures current through a circuit is Show Answer

Q2) The distinction between conductors, insulators and semi-conductor is largely concerned with Show Answer

Q3) If a body is charged by rubbing it ,its weight Show Answer

Q4) Electric lines of force about a negative point charge are Show Answer

Q5) What should be the characteristic of fuse wire? Show Answer

Q6) What is the material for electric fuse? Show Answer

Q7) The heating element of an electric heater should be made with a material, which should have Show Answer

Q8) Of the two bulbs in a house , one glows brighter than the other Which of the two has a larger resistance? Show Answer

Q9) First electro chemical cell was designed by Show Answer

Q10) When a neutral metal sphere is charged by contact with a positively charged glass, rod, the sphere Show Answer

Q11) Earth's magnetic field always has a horizontal component except at Show Answer

Q12) In which of the following devices temporary magnets are used? Show Answer

Q13) When an iron bar is moved over a bar magnet along its length the attractive force Show Answer

Q14) When the S-pole of a magnet is placed near an unknown pole of another magnet , the two magnets Show Answer

Q15) The magnet is strongest near the Show Answer

Q16) What is the reason to pivot the compass needle on a sharp pin? Show Answer

Q17) The laws of electromagnetic induction have been used in the construction of a Show Answer

Q18) An electric dipole is placed in a uniform electric field. The dipole will experience. Show Answer

Q19) Potential at any point inside a changed hollow sphere: Show Answer

Q20) Consider a neutral conducting sphere. A positives point charge is placed outside the sphere. The net charge on the sphere is then Show Answer

Q21) Number of electron in 1mC charge will be: Show Answer

Q22) Three bulbs of 40W, 60W and 100W are connected in series to a current source of 200v. Which of the following statement is true? Show Answer

Q23) The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance? Show Answer

Q24) The cause of heat production in a current carrying conductor is Show Answer

Q25) A 25W and 100W bulb are joined in series and connected to the mains. Which bulb will glow brighter? Show Answer

Q26) The resistance of a straight conductor does not depends on its Show Answer

Q27) For protecting a sensitive equipment from the external electric arc, it should be Show Answer

Q28) If a diamagnetic substance is brought near north or south pole of a bar magnet , it is Show Answer

Q29) Above Curie temperature Show Answer

Q30) When a ferromagnetic material is heated to temperature above its Curie temperature, the material: Show Answer

Q31) The materials suitable for making electromagnets should have Show Answer

Q32) Out of the following, diamagnetic substance is Show Answer

Q33) The core of a transformer is laminated because Show Answer

Q34) The frequency of A.C. mains in India is Show Answer

Q35) A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then Show Answer

Q36) At the time of short circuit the current in the circuit Show Answer

Q37) The essential difference between an AC generator and a DC generator is that Show Answer

Q38) The device used for producing electric current is called a Show Answer

Q39) A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of Show Answer

Q40) Rheostat is a device used to vary Show Answer

Q41) Electric iron uses wires of alloy as Show Answer

Q42) Power rating of an electric appliance indicates Show Answer

Q43) MRI stands for Show Answer

Q44) Two bars of soft iron exactly alike are given. One of them is a magnet. Without using any thing more, how would you find which is a magnet ? Show Answer

Q45) An electric motor is a device Show Answer

Q46) Which of the following statements cannot be related to an electric motor?
Show Answer

Q47) In domestic circuits, wire with red insulations are used as live wires, whereas Show Answer

Q48) Parameters of electricity supply in India are Show Answer

Q49) Which of the following is best insulator? Show Answer

Q50) Out of gravitational, electrostatic, vander waal and nuclear forces, which are able to provide attractive force between two neutrons? Show Answer

Q51) A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole . It Show Answer

Q52) Of dia, para and ferromagnetism, the universal property of all substances is Show Answer

Q53) The earth's magnetic field always has a vertical component except at the Show Answer

Q54) A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct? Show Answer

Q55) Two wires have their lengths, diameters and resistivities all in the ration of 1:2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is Show Answer

Q56) Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living being if they reach the surface of the Earth What prevents them from reaching the surface of the Earth? Show Answer

Q57) Which one of the following is printed on a commonly used fluorescent tube light? Show Answer

Q58) Domestic electrical wiring is basically a: Show Answer

Q59) What is the order of magnitude of electric resistance of the human body(dry)? Show Answer

Q60) Consider the following statements :
1) Diamagnetism is temperature independent.
2) Paramagnetism is explained by domain theory .
3) Above curie temperature a ferromagnetic material becomes paramagnetic .
4) Magnetic susceptibility is small and negative for diamagnetic substance.
Identity incorrect statements. Show Answer

Q61) A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is
1) held stationary
2) moved away along its axis
3) moved towards along its axis
There will be induced current in Show Answer

Q62) Consider the following statements:
1) A domestic electric appliance working on a 3-pin plug will continue working even of the top pin is removed.
2) The top pin is used only as a safety device.
3) It the filament of a light bulb is not uniform horizontal its life is shortened.
Which of the statements is/are correct?
Show Answer

Q63) Consider the following statement :
1) Resistivity of objects of different shapes and sizes but made of same material is same.
2) Resistivity of an object is independent of its dimensions.
3) Silver is the best metallic conductor of electricity.
4) Resistivity of the silver is the lowest among all metals.
Which of the statements are correct? Show Answer

Q64) Consider the following statements:
1) Coil of electric heater is made of an alloy rather than a pure metal.
2) Resistivity of an alloy is less than the resistivity of a pure metal.
3) A metallic wire is neutral although it contains large number of free electrons.
4) In a metallic wire, net charge is zero.
Which of the statements are correct? Show Answer

Q65) Consider the following statements?
1) The strength of magnetic field of a permanent magnet decreases with the increases in temperature,
2) A permanent magnet can be demagnetized by heating it.
3) A charged particle moving parallel to direction of magnetic field experience a force.
Which of the statement are correct? Show Answer

Q66) Consider the following statements:
1) An ammeter should have low resistance.
2) An ammeter should have high resistance.
3) A voltmeter should have low resistance.
4) A voltmeter should have high resistance
which of the statements are correct ? Show Answer

Q67) Consider the following statements:
1) At the center of bar magnet, magnetism is zero.
2) Induced magnetism is always lost completely n removing the inducing field.
3) A pocket watch can be shielded from magnetic effects if it is kept inside an iron casing.
Which of the statements given above are current? Show Answer

Q68) Consider the following statements regarding electric fuse wire:
1) It has low melting point.
2) It has very high specific resistance.
3) It is connected in parallel with the electric circuit.
Which of the statements given above is/are correct? Show Answer

Q69) Why does a tower appear larger and larger to a person approaching it?
1) The angle subtended by the tower at the eye increases.
2) The focal length of eye lens increases.
3) The size of the image on the retina of eye increases
Select the correct answer using the code below Show Answer

Q70) Consider the following statement:
1) The magnetic pole in the northern hemisphere is the north magnetic pole.
2) At all points on a magnet , an iron bar gets attracted.
Which of the statement given above is/are correct? Show Answer

Q71) Which of the following sentences is/are correct about a conductor of electricity?
1) Metals in general are good conductors of electricity.
2) Distilled water conducts electricity.
3) Top water conducts electricity.
4) Rubber is a bad conductor of electricity.
Show Answer

Q72) Which of the following are true about electromagnet?
1) If electric current is passed in an electromagnet then at there will be a deflection in the position of the needle of the magnetic compass(it is kept near the electromagnet)
2) the soft iron piece of the electromagnet acts like a magnet when electric current is passed through it.
3) Electromagnet can attract iron 'pieces'
4) The strength of an electromagnet depends on the number of the wire around the core. Show Answer

Q73) Consider the following statements:
1) The resistivity of copper wire is infinitely large.
2) Resistivity is measured in ohm-meter.
3) The resistivity of alloys decreases with the rise in temp.
4) Metals have high resistivity.
Which of these statements is/are correct?
Show Answer

Q74) Consider the following statements:
1) An ammeter is always connected in series in the circuit.
2) A voltmeter can only be connected in series in the circuit.
3) A voltmeter has low resistance.
Which of these statements is/are correct?
Show Answer

Q75) Consider the following statements:
1) Magnetic field produced by current in a straight wire has no poles.
2) The magnetic lines of force produced by a straight current carrying conductor are straight in nature.
3) To produced a strong magnetic field at its center, we prefer a current carrying wire loop of large radius.
Which of these statements is/are correct? Show Answer

Q76) Consider the following statements:
1) The strength of an electromagnet increases or decreases the amount of current flowing through it.
2) Right hand thumb rule can be employed to know the direction of magnetic field produced by a current carrying wire.
3) Melting point of the material of fuse wire should be extremely low.
Which of these statements is/are correct? Show Answer

Q77) Consider the following statement :
1) Like magnetic poles attract each other , unlike poles repel.
2) North and south poles of a magnet cannot be separated.
3) Which of the statements given above is/are correct?
Show Answer

Q78) Graphene is frequency in news recently. What is its importance?
1) It is a two-dimensional material and has good electrical conductivity.
2) It is one of the thinnest but strongest materials tested so far.
3) It is entirely made of silicon and has high optical transparency.
3) It can be used as 'conducting electrodes' required for touch screen,LCDs and organic LEDs.
Which of the statements given above are correct? Show Answer

Q79) Consider the following statements regarding a motor car battery:
1) The voltage is usually 12 V.
2) Electrolyte used is hydrochloric acid.
3) Electrodes are lead and copper.
4) Capacity is expressed in ampere-hour,
Which of the above statements are correct? Show Answer

Q80) Consider the following statements:
An ordinary light bulb has a rather short life because the :
1) filament wire is out uniform.
2) bulb cannot be evacuated completely.
3) wires supporting the filament melt at high temperatures.
Which of the above statements are correct? Show Answer

Q81) Assertion: Poles of a magnet can never be separated.
Reason: Since, each atom of a magnetic material is itself a magnet . Show Answer

Q82) Assertion: A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction.

Reason: The earth has both horizontal and vertical components of its magnetic field at the north pole Show Answer

Q83) Assertion: The earth magnetic field is due to iron present in its core.
Reason: At a high temperature magnet loses its magnetic property or magnetism Show Answer

Q84) Assertion: When two long parallel wires, handing freely are connected in series to a battery, they come closer to each other
Reason: Wires carrying current in opposite direction repel each other. Show Answer

Q85) Assertion: In a conductor, free electrons keep on moving but no magnetic force acts on a conductor in a magnetic field.
Reason: Force on free electrons due to magnetic field always acts perpendicular to its direction of motion. Show Answer

Q86) Assertion: Long distance power transmission is done at high voltage.
Reason: At high voltage supply power losses are less Show Answer

Q87) Assertion:A torch bulb give light if operated on AC of same voltage and current DC.
Reason: Heating effects is common to both AC and DC. Show Answer

Q88) Assertion : The temperature of a metal wire rises when an electric current is passed though it
Reason : Collision of metal atoms with each other releases heat energy. Show Answer

Q89) Assertion : Transformer is useful for stepping up or stepping down voltages .
Reason: Transformer is a device in D.C circuit. Show Answer

Q90) Assertion : In our houses, the current in A.C electricity line changes direction 60 times per second.
Reason : The frequency of alternating voltage is 50 Hz. Show Answer

Q91) What is the order of magnitude of electric resistance of the human body Show Answer

Q92) Assertion (A) A power transformer transforms the power.
Reason (R) Two windings are on the common core. Show Answer

Q93) AC cannot be used in Show Answer

Q94) Which one graph represent the resistance versus temperature curve for the superconductors ? Show Answer

Q95) Farad is the unit of Show Answer

Q96) Potential difference between two points of a wire carrying 2 A current is 0.1 V. The resistance of the wire is Show Answer

Q97) A choke coil with a tube are Show Answer

Q98) The angle made by the magnetic meridian at an point, with geometrical meridian refers to as.... Show Answer

Q99) Consider the following statements
1) Geometric meridian at the different places on the earth surface is different.
2) Geomagnetic meridian at the different places on the earth surface is different
3) Geomagnetic meridian is diametrical plane passes through a point on the earth.
4) Dip and inclination are the same.
Which of following statement(s) is/are correct ?
Show Answer

Q100) It two parallel wires having current in the same direction. Which of the following options is true ? Show Answer

Q101) The net resistance of an ammeter should be small to ensure that Show Answer

Q102) Consider the following statements
1) Kirchhoff's junction law follows from conservation of charge.
2) Kirchhoff's loop law follows from conservative nature of electric
Which statement(s) is/are true ? Show Answer

Q103) If the resistance of a home appliance is increased, then
1) its power will be increased
2) it can do work fastly
3) voltage will be increased
4) current will be increased
Which of the statement(s) is/are true ? Show Answer

Q104) When no current passes through a conductor, then
1) free electron do not move inside the conductor.
2) the average speed of free electrons inside the conductor over a large time period is zero
3) the average of the speeds of all the free electrons at an instant is zero
Which of the statement(s) is/are true ? Show Answer

Q105) If aluminium wire is used to conduct the electricity and if the length of wire is now doubled, its resistivity will Show Answer

Q106) Assertion (A) A p-type semiconductor is always positively charged.
Reason (R) A p-type semiconductor has majority of holes. Which of the following is true ? Show Answer

Q107) Doping is a Show Answer

Q108) Which one option is correct A 200A-h lead can give Show Answer

Q109) Assertion (A) Transformer used to transform the power.
Reason (R) It changes the voltage of the power.
Which one option is correct ? Show Answer

Q110) Assertion (A) Electric current is not a vector quantity.
Reason (R) A vector has its mangnitude in a direction
Which of the following is correct ? Show Answer

Q111) In step-down transformer, the AC output gives the Show Answer

Q112) what is the difference between a CFL and an LED lamp?
1. to produce light, a CFL uses mercury vapour and phosphor while LED lamp uses semi- conductor material.
2. the average life span of a CFL is much longer than that of an LED lamp.
3. A CFL is less energy - efficient as compared to an LED lamp.
Which of the statements given is/are correct? Show Answer

Q113) Assertion (A) : Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL).
Reason (R) : Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer using the codes given below: Show Answer

Q114) Which is the gas inside an electric bulb? Show Answer

Q115) Fluorescent tubes are fitted with a choke. The choke coil.
Show Answer

Q116) What is the difference between a CFL and an LED Lamp?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material?
2. The average life span of a CFL is much longer than of an LED lamp.
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct? Show Answer

Q117) Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thiner wire is 10 ohm, the resistance of the thicker wire is : Show Answer

Q118) Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A) : Transformer is useful for stepping up or stepping down voltages.
Reason (R) : Transformer is a device used in D.C. circuits.
In the context of the above two statements, which one of the following is correct ? Show Answer

Q119) Radioactive substance emits – Show Answer

Q120) Transformer is used for- Show Answer

Q121) Assertion (A) : In India, electricity distribution companies calculate the consumption of electricity in kWh.
Reason (R) : Electrical system in India works at a frequency of 60 Hz. Show Answer

Q122) Which one of the following metal is not attracted by a magnet :
Show Answer

Q123) The magnetic needle points to Show Answer

Q124) With which of the following is the tape of the tape recorder coated? Show Answer

Q125) The earth’s magnetic field is due to Show Answer

Q126) Which one of the following metals is used as semiconductor in transistors? Show Answer

Q127) Which of the following are semiconductors ?
1. Silicon 2. Quartz
3. Ceramics 4. Germanium
Choose the correct answer from the following alternatives : Show Answer

Q128) India’s first Polar Remotely Operated Vehicle (PROVe) was successfully operationalised for research in Show Answer