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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Class 6 Science Chapter 12 MCQ for 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
The half-life of a radioactive substance is 10 days; it means there will be
A) Complete decay of substance in 20 days
B) Complete decay of substance in 40 days
C) Decay of 3/4 part of substance in 20 days
D) Decay of 1/4 part of substance in 5 days
Option c – Decay of 3/4 part of substance in 20 days
The principle of the atomic bomb is based on
A) Nuclear fusion
B) Nuclear fission
C) Above both
D) Above none
Option b – Nuclear fission
The working principle of an atom bomb is nuclear fission of uranium, and the working principle of a hydrogen bomb is
A) Nuclear fusion of deuterium
B) Nuclear fission of thorium
C) Explosion of bomb involving hydrogen gas
D) Explosion involving dynamite and T.N.T.
Option a – Nuclear fusion of deuterium
A hydrogen bomb is based on the principle of
A) Controlled fusion reaction
B) Uncontrolled fusion reaction
C) Controlled fission reaction
D) Uncontrolled fission reaction
Option b – Uncontrolled fusion reaction
The hydrogen bomb was developed by
A) Edward Teller
B) Bernor Bon Bron
C) J. Robert Opan Heemar
D) Samual Cohen
Option a – Edward Teller
The ultimate product of the radioactive disintegration of uranium is
A) Lead
B) Radium
C) Thorium
D) Plutonium
Option a – Lead
A radioactive substance has a half-life of four months. Three-fourths of the substance would decay in
A) 3 months
B) 4 months
C) 8 months
D) 12 months
Option c – 8 months
If the half-life of a radioactive element is 5 years, then the fraction of the radioactive substance that remains after 20 years is
A) 1/2
B) 1/4
C) 1/8
D) 1/16
Option d – 1/16
India’s first atomic power station is
(A) BARC
(B) Tarapur Atomic Power Station
(C) Narora Atomic Power Station
(D) None of the above
Option b – Tarapur Atomic Power Station
Who is the present director of ‘BARC’?
(A) Satish Dhawan
(B) R.K. Sinha
(C) G. Madhavan Nayar
(D) Dr. Ramanna
Option b – R.K. Sinha
What are the links between Dhruva, Purnima, and Cirus?
(A) They are Indian research reactors
(B) They are stars
(C) They are names of famous books
(D) They are power plants
Option a – They are Indian research reactors
Which fuel is used by Nuclear reactors in India?
(A) U-270
(B) U-500
(C) Gasohol
(D) U-238
Option d – U-238
Kalpakkam is famous for
(A) Due to nuclear power plant
(B) Due to the defense laboratory
(C) Due to the rocket launching center
(D) Due to the space center
Option a – Due to nuclear power plant
Which one of the following is not radioactive?
(A) Astatine
(B) Francium
(C) Tritium
(D) Zirconium
Option d – Zirconium
Which Uranium isotope is used in nuclear power plants to produce electricity?
(A) U-233
(B) U-234
(C) U-235
(D) U-239
Option c – U-235
Which metal can be used for producing electricity?
(A) Uranium
(B) Iron
(C) Copper
(D) Aluminium
Option a – Uranium
Radioactive substance emits
(A) Alpha rays
(B) Beta rays
(C) Gamma rays
(D) All of these
Option d – All of these
What happens if the control rods are not used in a nuclear reactor?
(A) The reactor will stop working
(B) The chaining process would go out of bounds
(C) The reactor will be slow to act
(D) The reactor will continue to work as it is
Option b – The chaining process would go out of bounds
Which one of the following is India’s first nuclear plant?
(A) Narora
(B) Kalpakkam
(C) Tarapur
(D) Kota
Option c – Tarapur
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