Physics Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Physics Mcqs “. Tab this page to check “Latest Physics MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Physics in past papers. Past papers of Physics mcqs. Past papers of Physics MCQs. Physics Mcqs are the necessary part of any competitive / job related exams. The Physics mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Physics mcqs. The Important series of Physics Mcqs are given below:
The area under the force displacement graph represents__________________?
B. work done
D. none of these
Propulsion force of a rocket is____________________?
A. non-conservative force
B. both A and C
C. conservative force
D. none of these
Geothermal energy is a _______________________ source of energy?
D. none of the above
________________ cells converts solar energy into electrical energy?
D. non of these
Biomass can be converted into fuels by____________________?
B. direct combustion
C. both A and B
D. none of these
Which of the following substances posses the highest elasticity ?
What are the dimensions of stress ?
Which one of the following physical quantities does not have the dimensions of force per unit area ?
A. Youngs modulus
A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?
When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?
A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?
A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?
C. Stress x strain
D. (Stress / strain)
The ration stress to strain in youngs modulus of the material then tension is__________________?
A. Directly proportional to extension
B. Directly proportional to square of amplitude
C. Directly proportional to strain
D. Inversely proportional to extension
A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
A. The extension of the wire is proportional to the force applied
B. The wire is not stretched beyond its elastic limit
C. The weight of the wire is negligible
D. The cross sectional area of the wire remains constant
Formation of large molecule by joining small molecules is_________________?
The energy band occupied by the valence electrons is called___________________?
A. ve energy state
B. Valence band
C. Energy state
D. conduction band
A ferromagnet will become fully magnetized at_________________?
A. Low voltage A.C
B. High voltage A.C
C. Alternating current at its peak value
D. D.C current at peak value
Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?
A. Super conductors
B. Semi conductor
The angular position of cells remains the same for a sample of a crystal. This property is called___________________?
D. The external symmetry of form
If the density of atoms remain same along any direction in a crystal is called__________________?
The band theory of solids explains satisfactorily the nature of_________________?
A. Electrical conductors alone
B. Electrical insulators alone
C. Electrical semi conductors alone
D. All of the above
A completely filled band is called__________________?
A. Valence band
B. Conduction band
C. Forbidden band
D. Core band
Which one has the greatest energy gap ?
B. Semi conductor
D. Non metals
With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
A. Remains same
D. First increases then decreases
On the basis of band theory of solids the semiconductors have _____________________?
A. A partly filled valence band a totally empty conduction band and a wide forbidden band
B. A completely filled valence band a totally empty conduction band and a very wide forbidden band
C. A completely filled valence band a partially filled conduction band and a narrow forbidden band
D. A party filled valence band and totally empty conduction band
Very weak magnetic fields are detected by___________________?
C. Magnetic resonance imaging (MRI)
Energy needed to magnetize and demagnetize is represented by _________________?
A. Hysteresis curve
B. Hysteresis loop area
C. Straight line
D. Hysteresis loop
What is the SI unit of modulus of elasticity of substance ?
D. Being a number it has no unit.
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
A. 0.5×10-6 Nm-2
B. 5×106 Nm-2
C. 2×108 Nm-2
A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?
Materials that undergo plastic deformation before breaking are called __________________?
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
A. (F1+F2) (122-112)
B. (F1+F2) (121+122)
C. (F1+F2) (12-11)
D. (F1+F2) (12-11)
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
The curie temperature is that at which ____________________?
A. Paramagnetic becomes diamagnetic
B. Ferromagnetic becomes paramagnetic
C. Semi-conductor becomes conductors
D. Metals become super conductor
Coercive force is the force which opposes ____________________?
D. Surface cracking
The bulk properties of materials such as their mode of fracture can be related to their____________________?
The breaking of crystals along definite direction is called _____________________?
In simple cube one atom or molecule lies at its______________________?
A. Nine corners
B. Force corners
C. Eight corners
D. Six corners
A vacant or partially filled band is called _____________________?
A. Conduction band
B. Forbidden band
C. Valence band
D. Empty band
The electrons in conduction band are free to___________________?
A. Transport signals
B. Transport vibrations
C. Transport charge
D. Transport impulses
Many of the semi conductors are crystals of the type__________________?
A. Face centred cubic
B. Simple cubic
C. Body centred cubic
D. All of the above
Holes can exist in____________________?
C. Semi conductors
D. All of the above
In a semiconductors the charge carriers are ___________________?
A. Electrons only
B. Holes only
C. Electron and holes both
D. All of the above
The net charge on n-type material is____________________?
C. Both positive and negative
Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
A. magnetic field intensity
B. magnetic flux
C. magnetic induction
D. self inductance
What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
Two parallel wires carrying currents in the opposite directions____________________?
A. repel each other
B. have no effect upon each other
C. attract each other
D. they cancel out their individual magnetic fields
A magnetic field___________________?
A. never exerts a force on a charged particles
B. always exerts a force on a charged particle
C. exerts a force if the charged particle is moving in the direction of the magnetic field lines
D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Which one of the following material is most suitable for making core of an electromagnet ?
C. Cu-Ni alloy
D. soft iron
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
A. 1T = 10-4 G
B. 1T = 103 G
C. 1T = 10-2 G
D. 1T = 104 G
SI unit of flux density is____________________?
The standard vector symbol for flux density is ____________________?
An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
A. B = eE/V
B. E = BeV
C. E = BV
D. E = BeV/2
n instrument which can measure potential without drawing any current is_____________________?
B. A voltmeter
C. cathode ray oscilloscope (CRO)
When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
A. greater than the restoring couple
B. equal to the restoring couple
D. smaller than the restoring couple
Which one of the following is not an electromechanical instrument ?
D. AC transformer and DC generator
In a multi range ammeter as the range increases _____________________?
A. shunt value decreases
B. shunt value remains the same
C. shunt value increases
D. none of the above
A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
A. 2.0 mA
B. 200 mA
C. 20 mA
D. 0.2 mA
Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
A. BINA cosa
B. BINA tana
C. BINA sina
A galvanometer basically is an instrument used to ____________________?
A. detect current in a circuit
B. measure voltage across a circuit
C. measure current flowing through a circuit
D. measure potential difference between two points in a circuit
A wheat stone bridge is said to be balanced when____________________?
A. minimum current flows through the galvanometer branch
B. maximum current flows through the galvanometer branch
C. potential difference across galvanometer branch is maximum
D. potential difference across galvanometer branch is zero
A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
A. directly proportional to m
B. independent mass m
C. directly proportional to q
D. directly proportional to B
If a current carrying solenoid is suspended freely it will__________________?
A. comes to rest after rotation
B. come to rest in N-S direction
C. vibrating like galvanometer needle
D. be rotating
A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?
A magnetic compass will be deflected if it is kept near a____________________?
A. charge in motion
C. charge at rest
If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
A. τ = NIAB sinφ
B. τ = NIAB cosφ
C. τ = NIAB tanφ
D. τ = NIAB
Magnetic flux and flux density are related by___________________?
A. flux density = magnetic flux area
B. magnetic flux = flux density x area
C. magnetic flux = flux density / area
D. flux density = magnetic flux x area
The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?
A. a spiral
B. a circle
C. an ellipse
Value of permeability of free space in SI units is___________________?
A. 4πx10-10 WbA-1m-1
B. 4πx10-7 WbA-1m-1
C. 4πx10-9 WbA-1m-1
D. 4πx10-8 WbA-1m-1
The magnetic field strength of solenoid is__________________?
A. B = μN/I
B. B = μNI
C. B = μnI
D. Both B and C
The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?
The sensitivity of a galvanometer is given by__________________?
Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
A. 1:00 AM
B. 0.1 A
C. current sensitivity
D. 1 m A
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
A. a steady voltage cell is used
B. a most sensitive galvanometer is used
C. the balance point is close to the middle of the wire
D. a high resistance box is used in one of its gap
An ammeter measures the total current flowing through a circuit when it is connected__________________?
A. in series with the circuit
B. in series with any of the parallel resistances in the circuit
C. in parallel with circuit
D. in parallel with any of the series resistances in the circuit
The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
A. use a coil of very large area
B. use a very long and fine suspension
C. use a coil with very large number of turns
D. use a very strong magnetic field
When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
A. a parabola in a plane perpendicular to the field
B. a straight line parallel to the field
C. a circle in a plane perpendicular to the field
D. a straight line along its initial direction
Galvanometer is a very sensitive device with______________________?
A. very low damping
B. no damping at all
C. very high damping
D. radial field disintegration
Heating a magnet will ____________________?
A. weaken it
B. reverse its polarity
C. strengthen it
D. demagnetize it completely
A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
A. 5 volt
B. 4 volt
C. 2 volt
D. 0.4 volt
An alternating current or voltage_____________________?
A. varies in magnitude alone
B. fluctuates off and on
C. changes its direction again and again
D. changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
Electromagnetic waves travel in free space with the speed of___________________?
B. Cathode rays
C. Positive rays
D. More than sound waves
An electromagnetic wave consists of _____________________?
A. Electric field moving with velocity of light
B. Magnetic field moving with velocity of light in space
C. Electric and magnetic fields moving parallel to each other
D. Electric and magnetic fields moving perpendicular to each other
Waves emitted from the antenna are__________________?
A. Radio waves
B. Electromagnetic waves
C. Sound waves
D. Modulated waves
If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
A. Four times
B. One half
The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?
A. Sinusoidal current
B. Average current
C. r.m.s current
D. Net current
An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?
A changing magnetic flux produces around itself an induced_______________?
A. Electric field
B. Magnetic field
C. Electromagnetic force
D. Artificial gravitational field
The direction of propagation of an electromagnetic waves is________________?
A. Perpendicular to magnetic field
B. Perpendicular to both electric and magnetic field
C. Perpendicular to electric field
D. Parallel to electric and magnetic field
Electromagnetic waves transport___________________?
Electromagnetic waves emitted from antenna are________________?
D. All the above
A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ?
C. 15 sec
To find the r.m.s value of an alternating current mathematically we need to have ________________?
A. Square root of I2
B. Square root of mean value of I2
C. Mean value of I2
D. Square of 1/2
An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?
A. I = 2I∫Sin(πt/2)
B. I = 2I∫Sin(2πt)
C. I = I∫sin(2πt)
D. I = 2ISinπt
pure resistor circuit the voltage and current are_______________?
A. They are at 90? phase difference
B. Lagging each other
C. They have zero phase difference
D. No phase difference
When A.C current passes through a capacitor then the current relationship will be_______________?
A. The current lead voltage by phase angle is 90 degrees
B. The current lead voltage by phase angle is 45 degrees
C. The voltage leads current by phase angle is 90 degrees
D. The voltage leads current by phase angle is 45 degrees
In the capacitive circuit the current___________________?
A. Is in phase with voltage
B. Lags behind voltage by π/2
C. Opposite in phase of voltage by π
D. Leads forward the voltage by π/2
A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
A. Brightness decreases
B. Brightness increases
C. Remains same
D. No light