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Goyal Brothers Prakashan Class 8 Physics MCQs for Students
A straight wire of length 0.5m and carrying a current of 1.2A is placed in a uniform magnetic field of induction 2T. The magnetic field is perpendicular to the length of the wire. The force on the wire is :
(A) 1.2 N
(B) 2 N
(C) 2.4 N
(D) 3 N
Option a – 1.2 N
A charge moving with velocity v in the X-direction is subjected to a field of magnetic induction in the negative X-direction. As a result, the charge will
(A) Remain unaffected
(B) Start moving in a circular path in the Y-Z plane
(C) Retard along X-axis
(D) Move in a helical path around X-axis
Option a – Remain unaffected
A magnetic field exerts no force on
(A) a Stream of electrons
(B) a Stream of a proton
(C) an Unmagnetised piece of iron
(D) a Stationary charge
Option d – a Stationary charge
The cyclotron frequency of an electron revolving in a magnetic field of 1 T is approximate:
(A) 28 MHz
(B) 2.8 GHz
(C) 280 MHz
(D) 28 GHz
Option d – 28 GHz
An electron is traveling along the x – direction. It encounters a magnetic field in the y direction. Its subsequent motion will be
(A) a Straight line along the x-direction
(B) A circle in the xz plane
(C) A circle in the yz plane
(D) A circle in the xy plane
Option b – A circle in the xz plane
A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle with being
(A) A straight line
(B) A circle
(C) A helix with a uniform pitch
(D) A helix with a non-uniform pitch
Option c – A helix with a uniform pitch
When a current is passed in a moving coil galvanometer the coil gets deflected because :
(A) The current deflects any thing
(B) Current in the coil produces magnetic field
(C) Current in the coil produces an electric field
(D) A couple acts on the coil
Option b – Current in the coil produces magnetic field
The current that must flow through the coil of galvanometer so as to produce a deflection of one division on its scale is called :
(A) Micro-volt sensitivity
(B) Current sensitivity of galvanometer
(C) Charge sensitivity of the galvanometer
(D) Both ‘A’ and ‘B’
Option b – Current sensitivity of galvanometer
A moving coil galvanometer is based upon the principle that a wire carrying a current :
(A) Experiences a force in magnetic field
(B) Does not produce any field
(C) Produces magnetic field
(D) Produces heat
Option a – Experiences a force in magnetic field
A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction :
(A) Wherever left free
(B) North-South
(C) East-West
(D) At 45° with the east-west direction
Option c – East-West
In M.C.G. the coil will be in equilibrium position if :
(A) Deflecting torque = restoring torque
(B) Deflecting torque > restoring torque
(C) Deflecting torque < restoring torque
(D) Deflecting torque is ∞
Option a – Deflecting torque = restoring torque
A soft iron core is placed at the centre of rectangular coil in M.C.G because :
(A) It increases magnetic field
(B) It decreases magnetic field
(C) More current to pass through the coil
(D) No effect of iron core
Option a – It increases magnetic field
In moving coil galvanometer :
(A) Magnet is stationary
(B) Coil is stationary
(C) Magnet and coil are moving
(D) Magnet and coil are stationary
Option a – Magnet is stationary
The pole pieces used in moving coil galvanometer should produces a magnetic field :
(A) Equal to earths magnetic field
(B) Much stronger than earths magnetic field
(C) Much weaker than earths magnetic field
(D) Any arbitrary magnetic field
Option b – Much stronger than earths magnetic field
In any position of coil, the torque acting on the coil is maximum if it is suspended in :
(A) Uniform magnetic field
(B) Radial magnetic field
(C) Earths magnetic field
(D) Magnetic or electric field
Option b – Radial magnetic field
The lamp and scale arrangement of M.C.G is used to measure the :
(A) Current flowing through the coil
(B) Voltage
(C) e.m.f. of the cell
(D) Deflection of coil
Option d – Deflection of coil
The magnetic field is made radial in a M.C.G:
(A) To make field stronger
(B) To make field weaker
(C) To make scale linear
(D) To reduce its resistance
Option c – To make scale linear
In which of the following phenomena do heat waves travel along a straight line with the speed of light?
(a) Thermal conduction
(b) Thermal convection
(c) Thermal radiation
(d) Both, thermal conduction and radiation
Option c – Thermal radiation
People prefer to wear cotton clothes in the summer season. This is due to the fact that cotton clothes are:
(a) good absorbers of water
(b) good conveyors of heat
(c) good radiators of heat
(d) good absorbers of heat
Option a – good absorbers of water
Two identical solid pieces, one of gold and the other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that the density of gold is greater than that of silver):
(a) the gold piece will weigh more
(b) the silver piece will weigh more
(c) both silver and gold pieces weigh equal
(d) weighing will depend on their masses
Option b – the silver piece will weigh more
Hooke’s law is valid for:
(a) only the proportional region of the stress-strain curve
(b) the entire stress-strain curve
(c) the entire elastic region of the stress-strain curve
(d) elastic as well as the plastic region of the stress-strain curve
Option a – only the proportional region of the stress-strain curve
Which one of the following is the correct sequence of the passage of light in a compound microscope?
(a) Condenser – Objective lens – Eyepiece – Body tube
(b) Objective lens – Condenser – Body tube – Eyepiece
(c) Condenser – Objective lens – Body tube – Eyepiece
(d) Eyepiece – Objective lens – Body tube – Mirror
Option c – Condenser – Objective lens – Body tube – Eyepiece
If the length of the filament of a heater is reduced by 10%, the power of the heater will:
(a) increase by about 9%
(b) increase by about 11%
(c) increase by about 19%
(d) decrease by about 10%
Option b – increase by about 11%
A boat floating in a tank is carrying some passengers. If the passengers drink water from the tank, how will it affect the water level of the tank?
(a) It will go down.
(b) It will rise.
(c) It will depend on the atmospheric pressure.
(d) It will remain the same.
Option d – It will remain the same
A heavy body and a light body have equal kinetic energy. Then:
(a) the heavy body has greater momentum.
(b) the light body has greater momentum.
(c) both have equal momentum.
(d) both have the same angular momentum.
Option a – the heavy body has greater momentum
Dilatometer is used for the measurement of:
(a) electrical energy
(b) mechanical energy
(c) dimensional change in material
(d) thermal energy
Option c – dimensional change in material
Mirage is an illustration of:
(a) Only dispersion of light
(b) Only reflection of light
(c) Only the total internal reflection of light
(d) Both refraction and total internal reflection of light
Option d – Both refraction and total internal reflection of light
The waves produced by a motorboat sailing on the water are:
(a) transverse
(b) longitudinal
(c) longitudinal and transverse
(d) stationary
Option c – longitudinal and transverse
The power of a lens is +2.0D. The focal length of the lens and its nature are:
(a) 50 cm, concave
(b) 50 cm, convex
(c) 100 cm, convex
(d) 100 cm, concave
Option b – 50 cm, convex
The spectrum of color in a Compact Disc (CD) is due to:
(a) Refraction
(b) Reflection
(c) Diffraction
(d) Polarization
Option c – Diffraction
A hydraulic press is based on:
(a) Archimedes’ law
(b) Pascal’s law
(c) Reynolds’ law
(d) Bernoulli’s law
Option b – Pascal’s law
A passenger in a moving train tosses a coin upward which falls behind him. It implies that the motion of the train is:
(a) accelerated
(b) uniform
(c) retarded
(d) along the circular tracks
Option a – accelerated
Van de Graff generator is used for:
(a) accelerating charged particles
(b) generating large currents
(c) generating an electric field
(d) generating high-frequency voltage
Option a – accelerating charged particles
The temperature of water at the bottom of a lake whose upper surface has frozen to ice would be around:
(a) -10°C
(b) -0°C
(c) 4°C
(d) -4°C
Option c – 4°C
When looking at an image formed by a convex lens (one-half of the lens is covered with black paper), which one of the following will happen to the image?
(a) Half of the image will be visible
(b) The intensity of the image will be diminished.
(c) The image will be inverted now
(d) One can see an image of a smaller size.
Option b – The intensity of the image will be diminished
Atomizer works on the principle of:
(a) Avogadro’s hypothesis
(b) Pascal’s law
(c) Bernoulli’s theorem
(d) Ideal gas equation
Option c – Bernoulli’s theorem
When a body is executing simple harmonic motion and passes through the mean position, it has:
(a) Maximum kinetic energy and minimum potential energy
(b) Both kinetic energy and potential energy minimum
(c) Both kinetic energy and potential energy maximum
(d) Minimum kinetic energy and maximum potential energy
Option a – Maximum kinetic energy and minimum potential energy
During short-circuiting, the current flowing in the electrical circuit:
(a) reduces substantially
(b) does not change
(c) increases instantaneously
(d) varies continuously
Option c – increases instantaneously
The motion of the wheels of a bullock cart while moving on the road is an example of:
(a) Oscillatory and rotatory motion
(b) Oscillatory and translatory motion
(c) Translatory and rotatory motion
(d) Translatory motion only
Option c – Translatory and rotatory motion
If the earth stops rotating, the apparent value of ‘g’ on its surface will:
(a) increase in some places and remain the same in other places
(b) increase everywhere
(c) decrease everywhere
(d) remain the same everywhere
Option a – increase in some places and remain the same in other places
The tape recorder records sound in the form:
(a) Sound waves
(b) Electrical energy
(c) Magnetic energy
(d) Variable resistance
Option c – Magnetic energy
In photoelectric emission, the energy of the emitted electron is:
(a) same as that of the incident photon
(b) larger than that of the incident photon
(c) less than that of the incident photon
(d) proportional to the intensity of the incident light
Option a – same as that of the incident photon
Angular momentum is equal to:
(a) moment of inertia angular velocity
(b) mass angular velocity
(c) linear velocity angular velocity
(d) mass linear velocity
Option a – moment of inertia angular velocity
Superconductivity:
(a) very feeble current
(b) very large current
(c) current without facing any resistance
(d) current due to positive particles
Option c – current without facing any resistance
A Tachometer is a device used to:
(a) gravitational pull
(b) speed of rotation
(c) surface tension
(d) dispersive power
Option b – speed of rotation
Tesla is a unit of:
(a) flux
(b) induction
(c) moment
(d) field
Option d – field
Relative humidity is expressed as:
(a) Grams
(b) Kilograms
(c) Percentage
(d) Ratio
Option c – Percentage
According to the special theory of relativity, the mass of a particle:
(a) increases with an increase in velocity with respect to an observer
(b) decreases with an increase in velocity
(c) decreases with a decrease in velocity
(d) is independent of its velocity
Option a – increases with an increase in velocity with respect to an observer
Certain substances lose their electrical resistance completely at super-low temperatures. Such substances are called:
(a) superconductors
(b) semiconductors
(c) dielectrics
(d) perfect conductors
Option a – superconductors
A second pendulum is a pendulum whose time period is:
(a) 1 second
(b) 4 seconds
(c) 3 seconds
(d) 2 seconds
Option d – 2 seconds
A jug is filled to the brim with water at 0°C. A piece of ice floats in it. The moment the ice melts:
(a) water spills out of the jug
(b) water level increases
(c) water level decreases
(d) water level is unchanged
Option d – water level is unchanged
Which of the following devices can be used to detect radiant heat?
(a) Liquid thermometer
(b) Six’s maximum and minimum thermometer
(c) Constant volume air thermometer
(d) Thermopile
Option d – Thermopile
The threshold frequency is the frequency below which:
(a) photocurrent increases with voltage
(b) photocurrent decreases with voltage
(c) photoelectric emission is not possible
(d) photocurrent is constant
Option c – photoelectric emission is not possible
Sir C.V. Raman was awarded the Nobel Prize for his work in:
(a) Light scattering
(b) Radioactivity
(c) Cryogenics
(d) Sonometer
Option a – Light scattering
A metal screw-top on a glass bottle that appears to be stuck could be opened using the fact that:
(a) the metal expands more than the glass when both are heated
(b) the metal and glass expand identically when heated
(c) the metal shrinks when heated
(d) both metal and glass shrink when cooled
Option a – the metal expands more than the glass when both are heated
Fleming’s right-hand rule is used to find the direction of the:
(b) Direct Current
(c) Induced Current
(d) Actual Current
Option c – Induced Current
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