#### 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:

**A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?**

A. (R+2πfL)

B. (R2+f2L2)

C. R+1/2πfL **D. (R2+4π2f2L2)**

**Ammeter connected in an AC circuit measures______________?**

A. The net value of the current **B. RMS value of the current**

C. The exact value of the current

D. The peak value of the current

**When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?**

**A. Same**

B. At L will be more than at C

C. Different

D. At L will be less than at C

**What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?**

A. 2.0H **B. 0.5H**

C. 0.5 mH

D. 8.0H

**The frequency of a circuit consisting of a capacitance C and a resistor R is________________?**

A. R/C

B. C/R **C. 1/RC**

D. 1/ 2RC

**A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?**

A. 220/ 2V

B. 220V

C. 110V**D. 220 √2V**

**A choke is used as a resistance in_________________?**

A. Both AC and DC circuit **B. AC circuits**

C. DC circuit

D. Full wave rectifier circuit

**At resonance the value of the power factor in an L-C-R series circuit is_______________?**

A. 2

B. Zero **C. 1**

D. Not definite

**An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________?**

A. 7Ω **B. 5Ω**

C. 1Ω

D. 7Ω

**An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?**

A. 12mH

B. 10mH **C. 16mH**

D. 20mH

**Choose the correct statement. In the case of AC circuit ohms law holds for_______________?**

A. Effective values of voltage and current

B. Peak values of voltage and current

C. Instantaneous values of voltage and current**D. All of the above**

**The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?**

**A. Zero**

B. 90°

C. 45°

D. 180°

I**n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?**

A. V2 = VR2+VL2+VC2

B. V = VR+VL+VC **C. V2 = VR2+(VL-VC)2**

D. V2 = VL2+(VR-VC)2

**A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?**

A. V/√2√R

B. V√/√2R **C. V02/√2R**

D. 2/√2√R

**Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?**

A. Each remains the same **B. Each decrease**

C. Each increase

D. One increases whereas that in the other decreases

**An inductor may store energy in ________________?**

A. Its coils

B. Its electric field **C. Its magnetic field**

D. Both electric and magnetic fields

**Addition of vector obeys_____________?**

A. Distributive law

B. Commutative law

C. Associative law**D. All given laws in A, B and C**

**The direction of a vector in space is specified by_______________?**

A. Two angle

B. One angle **C. Three angle**

D. No angle

**A vector can be multiplied by a number. The number may be_______________?**

A. Dimensional scalar

B. Dimensionless

C. Negative**D. All A, B and C are correct**

**Unit vector n^ is along______________?**

A. Y-axis **B. Normal on a surface**

C. X-axis

D. Z-axis

**The rectangular coordinate system is also called______________?**

A. Cylindrical coordinate system **B. Cartesian coordinate system**

C. Polar coordinate system

D. Spherical coordinate system

**Maximum number of rectangular components are_____________?**

A. 2

B. 1 **C. 3**

D. 4

**Cosθi^ + Sinθj^ is a_________________?**

A. Position Vector

B. Vector

C. Vector in the direction at angle θ with an x-axis**D. The unit vector in the direction at angle θ with an x-axis**

**Maximum number of components of a vector may be________________?**

A. 2

B. 1

C. 3**D. Infinite**

**Which one is not correct for a vector A= 2i+2j+3k ?**

A. Has magnitude 2

B. Has direction 45° with an x-axis

C. Has magnitude 2 and direction °=45° with a y-axis**D. Has magnitude -2**

##### Physics Mcqs

**The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?**

A. 60°

B. 30°

C. 90°**D. 120°**

**Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?**

**A. Concurrent**

B. Parallel

C. Non-concurrent

D. Non-parallel

**Which of the following pairs does not have identical dimensions ?**

A. Momentum and impulse

B. Torque and energy

C. Energy and work**D. Mass and moment of inertia**

**It is easier to turn a steering wheel with both hands than with a single hand because______________?**

A. Two forces act on the wheel

B. Accelerating force increases on the wheel

C. Two hands provide a firm grip**D. The couple acts on the wheel**

**The cross product i^ x j^ is equal to_______________?**

A. One

B. Zero

C. i^**D. k^**

**The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?**

A. (2i^ – 2j^ +k^)/9

B. 2i^ – 2j^ + k^ **C. (2i^ – 2j^ +k^)/3**

D. (2i^ – 2j^ +k^)/5

**The cross product of two vectors is a negative vector when______________?**

A. They are anti parallel vectors

B. They are parallel vectors

C. They are a perpendicular vector**D. They are rotated through 270°**

**In which quadrant, the only value of tan will be positive ?**

A. Second

B. First

C. Third**D. Both 1st and 3rd**

**The magnitude of i^. (j^ x k^) is________________?**

A. -1 **B. 1**

C. 0

D. i^

**If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________?**

**A. A. B = Ax Bx + Ay By + Az Bz**

B. A. B = Ay Bz + Az By + Az Bx

C. A. B = Ax By + Ay Bz + Az By

D. A. B = Ax Bz + Ay By + Az Bx

**A central force is that which__________________?**

A. Has no relation with torque **B. Cannot produce torque**

C. Some time can produce torque some time cannot

D. Can produce torque

**What is the angle that the given vector makes with y-axis and A=2i+3j ?**

A. 90° **B. 60°**

C. 30°

D. 120°

**In which quadrant the two rectangular components of a vector have same sign ?**

A. 2nd

B. 1st **C. Both 1st and 3rd**

D. 4th

**Two vectors A and B are making angle θ with each other. The scalar projection of vector B on vector A is written as____________?**

**A. A.B/A**

B. A.cosθ

C. A.B/B

D. Both a and b are correct

**Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then_____________?**

A. B is perpendicular to A **B. B is a negative vector of A**

C. B has a negative magnitude

D. B is anti-parallel to A

**If A=B, which of the following is not correct ?**

**A. A.B = A^ B^**

B. |A^| = |B^|

C. |A| = |B|

D. AB^ = BA^

**I ^. (j^ x k^) is equal to______________?**

**A. 1**

B. j^

C. i^

D. k^

**The direction of the vector product is given by______________?**

A. Left-hand rule **B. Right-hand rule**

C. Head to tail rule

D. Triangular rule

**If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?**

A. North

B. West **C. Down**

D. Up

**Null vector is a vector which has________________?**

A. No specified direction

B. Zero magnitude **C. Both A and B are correct**

D. Both A and B are not correct

**Which one is a unit vector ?**

A. 1/??3 i^ + 1/??3 j^ +1/ ??3 k^

B. ??3 i^ + ??3 j^ + ??3 k^

C. ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^**D. Both B and C are correct**

**An angle between two vectors A and B can be determined by_____________?**

**A. Their dot product**

B. Head to tail rule

C. Their cross product

D. Right-hand rule

**The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?**

A. 60° **B. 45°**

C. 30°

D. 180°

**Torque is defined as______________?**

A. Product of force and moment arm

B. Cross product of position vector and force

C. Turning effect of force **D. All A, B and C are correct**

**The dimension of torque is______________?**

**A. [ML2T-2]**

B. [ML2T]

C. [MLT-2]

D. [ML-2T-2]

**SI unit of torque is______________?**

**A. N.m**

B. Both a and c are correct

C. joule

D. Neither a nor c is correct

**Torque acting on a body determines_______________?**

A. Linear acceleration

B. Acceleration **C. Angular acceleration**

D. Direction of motion of the body

**A body in equilibrium__________________?**

A. Always in uniform motion

B. Always at rest **C. May be at rest or in uniform motion**

D. May be at rest or in motion

**A body will be in complete equilibrium when it is satisfying______________?**

A. 2nd condition of equilibrium

B. 1st condition of equilibrium **C. Both Ist and 2nd condition of equilibrium**

D. Impossible

**Which one is not a type of dynamic equilibrium ?**

A. Translational equilibrium

B. Rotational equilibrium **C. Static equilibrium**

D. Both A and C are corret answer

**According to which one of following law the density of atom is uniform ?**

**A. J.J.Thomson model**

B. Bohrs model

C. Rutherfords model

D. All of the above laws contradict the statement

**In the nucleus of uranium, the number of neutrons will be _____________?**

A. 235

B. 92

C. 143**D. Different for different isotopes**

**During fusion of hydrogen into helium________________?**

A. Mass is increased due to energy absorption **B. Energy is released**

C. Energy is absorbed

D. Mass is reduced due to the energy released

**One AMU is equal to__________________?**

A. 1.66 x 10-27kg

B. 166 x 10-20g

C. 166 x 10-15ng **D. All of above**

**For chain reaction to build up the size of the radioactive target should be______________?**

**A. Greater than the critical size**

B. Equal to the critical size

C. Less than the critical size

D. All of above can build up a change reaction

**Antimatter consists of ______________?**

A. Antineutron

B. Antiproton

C. Positron**D. All of above**

**Neutron and proton are commonly known as______________?**

**A. Nucleon**

B. Boson

C. Meson

D. Quartz

**Which one of the following radiation possesses maximum penetrating power ?**

A. B-rays

B. X-rays **C. γ-rays**

D. All have the equal penetrating power

**Electrons_________________?**

A. Cannot exist inside the nucleus

B. Can exist inside the nucleus

C. Can exist both inside and outside the nucleus**D. Do not know**

**Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________?**

A. B & C

B. A & B **C. C & A**

D. A B & C

**The energy liberated when one atom of U-235 undergoes fission reaction is________________?**

**A. 200MeV**

B. 30MeV

C. 40MeV

D. 20MeV

**Transuranic elements have an atomic number_______________?**

A. Greater than 82

B. Greater than 72 **C. Greater than 92**

D. Greater than 102

**Nuclear forces exist between ___________________?**

A. Proton-neutron

B. Proton-proton

C. Neutron-neutron**D. All of the above**

**Mass defect per nucleon is ___________________?**

A. The average energy of the nucleus **B. Packing fraction**

C. The binding energy of the nucleus

D. All of above are one and the same thing

**The bombardment of nitrogen with alpha particles will produce______________?**

A. Electron **B. Proton**

C. Neutron

D. Positron

**The diameter of an atom is approximately_______________?**

A. 10-11m

B. 10-12m **C. 10-10m**

D. 10-14m

**Radioactive decay obeys which one of the following law ?**

**A. N=Noe-λt**

B. N=Noe-λt/2

C. N=Noeλt

D. No=N(1+eλt)

**Average energy required to remove one nucleon from the nucleus is called__________________?**

**A. Binding energy per nucleon**

B. Destruction energy

C. Energy of decay

D. All of above

**The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?**

A. Graphite rods

B. Iron rods **C. Cadmium rods**

D. Platinum rods

**Which one of the following radiations possesses maximum velocity ?**

A. β-rays

B. α-rays **C. γ-rays**

D. All of above have the same speed

**The charge on an electron was determine by ________________?**

A. Maxwell

B. Ampere **C. Millikan**

D. Thomson

**The charge on neutron is_______________?**

A. Minus 1.6 x 10-19C **B. Zero**

C. Plus 1.6 x 10-19C

D. No definite charge

**A particle having the mass of an electron and the charge of a proton is called a______________?**

A. Gamma rays **B. Positron**

C. Antiproton

D. Photon

**Mass of neutron is________________?**

A. 9.1 x 10-31 kg **B. 1.67 x 10-27 kg**

C. 1.67 x 10-31 kg

D. 1.67 x 10-19 kg

**Nuclei having the same mass number but different atomic number are____________?**

A. Isotones **B. Isobars**

C. Isotopes

D. Isomers

**A mass spectrograph (spectrometer) sorts out____________?**

A. Ions

B. Molecules **C. Elements**

D. Isotopes

**Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________?**

A. Same **B. Greater than 82**

C. Smaller

D. Sometimes smaller some times greater

**An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?**

A. 220 – 80

B. 224 – 84 **C. 222 – 86**

D. 226 – 87

**The unit of radioactivity curie is equal to_________________?**

A. 3.55 x 1010 disintegration per sec **B. 3.70 x 1010 disintegration per sec**

C. 3.74 x 109 disintegration per sec

D. 3.60 x 1010 disintegration per sec

**The unit of radioactivity curie is equal to________________?**

A. 3.55 x 1010 disintegration per sec **B. 3.70 x 1010 disintegration per sec**

C. 3.74 x 109 disintegration per sec

D. 3.60 x 1010 disintegration per sec

**During the fission process a large amount of______________?**

A. Chemical energy is released **B. Nuclear energy is released**

C. Heat energy is released

D. Light energy is released

**Ina liquid metal fast breeder reactor, the type of uranium used is______________?**

A. 92U234 **B. 92U238**

C. 92U235

D. 92U239

**Radioactive materials can be identified by measuring their_______________?**

A. Hardness

B. Mass

C. Density **D. Half life**

**If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self-sustained and is known as __________________?**

A. Fusion reaction

B. Fission reaction **C. Chain reaction**

D. Chemical reaction

**Pair production takes place in the vicinity of a heavy nucleus so that_____________?**

A. Net charge is conserved

B. Net energy is conserved

C. Net momentum is conserved**D. All of the above**

**During an encounter with an atom alpha particle knocks out ______________?**

A. Neutrons **B. Electrons**

C. Protons

D. Nothing

**The path of alpha particle is_______________?**

A. Curved

B. Rectilinear **C. Zig-zag or erratic**

D. Elliptical

**Which of the following radiations are suitable for the treatment of an infection in the interior of the body ?**

A. β-rays

B. α-rays **C. γ-rays**

D. X-rays

**Various types of cancer are treated by_________________?**

**A. Cobalt-60**

B. Carbon-14

C. Strontium-90

D. Nickel-63

**Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of_______________?**

A. β-rays

B. α-rays **C. γ-rays**

D. B and C have equal antiseptic properties

**The charge on alpha particles is________________?**

A. Minus two **B. Plus two**

C. Plus one

D. Minus one

**Alpha particle ionizes an atom_________________?**

A. Through electrostatic attraction

B. Through direct collision **C. Through electrostatic repulsion**

D. All of above

**T.V sets and microwave ovens emit ___________________?**

**A. X-rays**

B. β-rays

C. α-rays

D. γ-rays

**An alpha particle in a single encounter__________________?**

A. Loses no energy at all **B. Losses most of its energy**

C. Loses a small fraction of its energy

D. Loses all of its energy

**Strontium-90 is used as __________________?**

**A. α-particle source**

B. γ-rays source

C. β-particle source

D. Neutron source