Q 1 – In making a battery
(a) positive terminal of one cell is connected to the negative terminal of the next cell
(b) positive terminal of one cell is connected to the positive terminal of the next cell
(c) negative terminal of one cell is connected to the negative terminal of the next cell
(d) none of the above
Ans. (a) positive terminal of one cell is connected to the negative terminal of the next cell
Q 2 – Where can the key or switch be placed in the circuit?
(a) Left side of the battery
(b) Right side of the battery
(c) Can be placed anywhere in the circuit
(d) Near the positive terminal of the bulb
Ans. (c) Can be placed anywhere in the circuit
Q 3 – Which one of the following is based on the heating effect of current?
(a) Geyser
(b) Hair dryer
(c) Immersion rod
(d) All of these
Ans. (d) All of these
Q 4 – The coil of wire contained in an electric heater is known as
(a) component
(b) element
(c) circuit
(d) spring
Ans. (b) element
Q 5 – The amount of heat produced in a wire depends on
(a) material
(b) length
(c) thickness
(d) all of these
Ans. (d) all of these
Q 6 – Which mark is necessary on electric appliances?
(a) AGMARK
(b) ISI
(c) FICCI
(d) KSK
Ans. (b) ISI
Q 7 – When an electric current flows through a copper wire AB as shown in Figure, the wire
(a) deflects a magnetic needle placed near it
(b) becomes red hot
(c) gives electric shock
(d) behaves like a fuse
Ans. (a) deflects a magnetic needle placed near it
Q 8 – Choose the statement which is not correct in the case of an electric fuse.
(a) Fuses are inserted in electric circuits of all buildings.
(b) There is a maximum limit on the current which can safely flow through the electric circuits.
(c) There is a minimum limit on the current which can safely flow in the electric circuits.
(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.
Ans. (c) There is a minimum limit on the current which can safely flow in the electric circuits.
Q 9 – When a switch is in OFF position.
(i) circuit starting from the positive terminal of the cell stops at the switch.
(ii) circuit is open.
(iii) no current flows through it.
(iv) current flows after some time.
Choose the combination of correct answer from the following:
(a) all are correct
(b) (ii) and (iii) are correct
(c) only (iv) is correct
(d) only (i) and (ii) are correct
Ans. (b) (ii) and (iii) are correct
Q 10 – Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?
(a) We should never touch a lighted electric bulb connected to the mains.
(b) We should never experiment with the electric supply from the mains or a generator or an inverter.
(c) We should never use just any wire or strip of metal in place of a fuse.
(d) We should never turn the switch in ON position
Ans. (d) We should never turn the switch in ON position.
Q 11 – Electromagnet loses its magnetic property when
(a) Current is very high
(b) Current is switched OFF
(c) Heat is increased
(d) Current is switched ON
Ans. (b) Current is switched OF
Q 12 – A ____________ is used in torches.
(a) Generator
(b) Fuse
(c) Secondary cell
(d) Dry cell
Ans. (d) Dry cell
Q 13 – Electromagnet is used in
(a) Battery
(b) Dry cell
(c) Electric bell
(d) Fuse
Ans. (c) Electric bell
Q 14 – A device which prevents or allows the current to f low through it
(a) Motor
(b) Terminal
(c) Conductor
(d) Switch
Ans. (d) Switch
Q 15 – The metal which is poor conductor of electricity is
(a) Gold
(b) Iron
(c) Aluminium
(d) Mercury
Ans. (d) Mercury
Q 16 – Electric current is measured by a device called
(a) Voltmeter
(b) Ammeter
(c) Electroscope
(d) None of these
Ans. (b) Ammeter
Q 17 – A device that break the electric circuit in case of excess current is called
(a) Switch
(b) Fuse wire
(c) Voltmeter
(d) Earth wire
Ans. (b) Fuse wire
Q 18 – Study of relationship between electricity and magnetism is called
(a) Current electricity
(b) Electric magnetism
(c) Magneto electricity
(d) Electromagnetism
Ans. (d) Electromagnetism
Q 19 – Coils of heating devices are made up of
(a) Mercury
(b) Nichrome
(c) Copper
(d) Tungsten
Ans. (b) Nichrome
Q .20 – Electromagnet is based on
(a) Chemical effect of electric current
(b) Heating effect of electric current
(c) Magnetic effect of electric current
(d) Electro-chemical effect of electric current
Ans. (c) Magnetic effect of electric current
Q 21 – Fuse wire is made up of alloys of
(a) High melting point
(b) Low melting point
(c) Low boiling point
(d) None of these
Ans. (b) Low melting point
Q 22 – Fuse wire is made up of alloys of
(a) High melting point
(b) Low melting point
(c) Low boiling point
(d) None of these
Ans. (b) Low melting point
Q 23 – Wire carrying current produce attracts the magnetic material due to
(a) Magnetic field
(b) Chemical effect
(c) Heating effect
(d) All of these
Ans. (a) Magnetic field
Q 24 – Fuse wire is used in electric circuit to prevent
(a) Prevent the ammeter
(b) Us from electric shock
(c) Electrical appliances and circuit
(d) Prevent the insulator
Ans. (c) Electrical appliances and circuit
Q 25 – Why are symbols used f or electronic components?
(a) It makes it easier to draw the circuit diagrams
(b) It is essential to draw the circuit diagrams
(c) It helps to show the direction of f low of current in a circuit
(d) All of the above
Ans. (a) It makes it easier to draw the circuit diagrams
Q 26 – Heating effect of electric current is used in
(a) Electric watch
(b) Bread toaster
(c) Switch
(d) None of these
Ans. (b) Bread toaster
Q 27 – In electrical wiring, the wire with black insulation is usually
(a) Fuse wire
(b) Live wire
(c) Earth wire
(d) Neutral wire
Ans. (d) Neutral wire
Q 28 – MCB in electric circuit stand f or
(a) Miniature circuit breaker
(b) Maximum current breaker
(c) Minimum current breaker
(d) Molar current breaker
Ans. (a) Miniature circuit breaker
Q 29 – When electric current f lows through a conductor, the conductor becomes
(a) liquid
(b) vapor
(c) hot
(d) cold
Ans. (c) hot
Q 30 – Electric current is said to pass through a wire when
(a) Only proton pass through it
(b) Only electron passes through it
(c) No particle pass through it
(d) Both electron and neutron pass through it
Ans. (b) Only electron passes through it
Q 31 – Which of the f ollowing materials is a conductor?
(a) Silver
(b) Rubber
(c) Cloth
(d) Plastic
Ans. (a) Silver
Q 32 – A device that converts the electrical energy into heat energy is
(a) Motor
(b) Heater
(c) MP3
(d) Fan
Ans. (b) Heater
Q 33 – Nichrome is used a coil of heater because
(a) It has high resistance and high melting point
(b) Low resistance and high melting point
(c) High resistance and low melting point
(d) None of the above
Ans. (a) It has high resistance and high melting point
Q 34 – A fuse is fixed in a circuit in order to
(a) decrease the amount of current
(b) increase the amount of current
(c) increase the power consumed in the circuit
(d) safeguard against excessive current
Ans. (d) safeguard against excessive current