Class 6 Science Chapter 12 MCQ. We covered all the Class 6 Science Chapter 12 MCQ in this post for free so that you can practice well for the exam.
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MCQ on General Science for Class 6 Students
Appliances: Parallel Fuse: ……..
(a) Series
(b) Parallel
(c) Series in appliances always
(d) Parallel in fuse always
Option a – Series
The magnitude of the force experienced by a current-carrying conductor when placed in a magnetic field will be
(a) maximum if the directions of the current and magnetic field are perpendicular to each other
(b) minimum if the directions of the current and magnetic field are perpendicular to each other
(c) maximum if the directions of the current and magnetic field are opposite to each other
(d) maximum if the directions of the current and magnetic field are the same
Option a – maximum if the directions of the current and magnetic field are perpendicular to each other
The reciprocal of the combined resistance of any number of resistances connected in parallel is equal to
(a) the sum of reciprocals of individual resistances
(b) the reciprocal of the product of individual resistances
(c) the reciprocal of the sum of all the resistances
(d) None of the above
Option a – the sum of reciprocals of individual resistances
If the current I through a resistor is increased by 100% (assuming that temperature remains unchanged), the increase in power dissipated will be
(a) 100%
(b) 200%
(c) 300%
(d) 400%
Option c – 300%
When two or more resistors are connected in parallel,
(a) The current passing through each resistor is the same
(b) The potential difference across each resistor is the same
(c) Both of the above
(d) None of the above
Option b – The potential difference across each resistor is the same
A small rod is wound around with certain coils and current is allowed for some time. When the rod was taken out, it was found not to attract iron. The material of the rod may be
(a) copper
(b) cobalt
(c) steel
(d) nickel
Option a – copper
The potential difference that can be produced using an AC generator be doubled by doubling the
(a) number of turns N only
(b) area of the coil A
(c) speed of rotation to only
(d) magnetic field only
Option b – area of the coil A
The combined resistance of any number of resistances connected in series is equal to
(a) The sum of individual resistance
(b) The sum of reciprocals of individual resistances
(c) Product of individual resistances
(d) Highest individual resistance
Option a – The sum of individual resistance
An air conditioner of 2000 W, a fan of 500 W, a bulb of 40 W, and a computer offering 30 W are used in a household using 220V. The power rating of the fuse to be used in this case is
(a) 10A
(b) 15A
(c) <20 A
(d) <5A
Option c –
Identify the incorrect statement: Magnetic field lines due to a circular coil is
(a) circular near the wire
(b) straight along the axis
(c) leaving both the planes
(d) perpendicular to the plane
Option c – leaving both the planes
The power rating of an electric appliance indicates
(a) The rate of consumption of electrical energy
(b) the amount of heat evolved
(c) the Brightness of the light
(d) the Quality of the appliance
Option a – The rate of consumption of electrical energy
A cooler of 1500 W, 200 volts, and a fan of 500 W, 200 volts are to be used from a supply. The rating of the fuse to be used is
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A
Option d – 10 A
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
(a) more length
(b) less radius
(c) less length
(d) more radius
Option d – more radius
The rheostat is a device used to vary
(a) voltage
(b) current
(c) resistance
(d) power
Option b – current
Electric iron uses wires of alloy as
(a) they do not oxidize at high temperatures
(b) they do not burn at high temperatures
(c) both (a) and (b)
(d) neither (a) nor (b)
Option c – both (a) and (b)
A student records that 36,000 joules of energy are used by him in an hour. The amount of electrical energy required to be used is
(a) 36 kWh
(b) 100 kWh
(c) 0.001 kWh
(d) 0.01 kWh
Option d – 0.01 kWh
To increase the resistance in a network, one has to connect any given resistor in
(a) parallel
(b) series
(c) can be (a) or (b)
(d) only (a)
Option b – series
The heat produced due to the flow of current through a conductor is given by the formula
(a) H = I² Rt
(b) H = VIt
(c) H = V²t/R
(d) All of the above
Option d – All of the above
The two forms of energy released by a tungsten filament used in a bulb are
(a) electrical and light
(c) heat and electrical
(d) electrical only
The direction of the force experienced by a current-carrying conductor when placed in a magnetic field is dependent on
(a) the direction of the current alone
(b) the direction of the magnetic field alone
(c) the direction of the current as well as the direction of the magnetic field
(d) None of these
Option c – the direction of the current as well as the direction of the magnetic field
Potential difference is defined as
(a) the amount of work done in moving a unit charge in a unit of time
(b) the distance between the two terminals
(c) the length of the connecting wire
(d) the amount of work done in moving a unit charge
Option d – the amount of work done in moving a unit charge
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