TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 351: Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?
- A The soft target which can easily emit electrons
- B All of above are correct
- C The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
- D Number of incident electron i.e. filament current
Explanation:
Question 352: What is the angle that the given vector makes with y-axis and A=2i+3j ?
- A 60
- B 30
- C 120
- D 90
Explanation:
Question 353: The curie temperature is that at which ____________________?
- A Semi-conductor becomes conductors
- B Ferromagnetic becomes paramagnetic
- C Paramagnetic becomes diamagnetic
- D Metals become super conductor
Explanation:
Question 354: Which one is the derived quantity in SI units _____________?
- A Electric current
- B Electric charge
- C Amount of substance
- D Plane angle
Explanation:
Question 355: Nuclear forces exist between ___________________?
- A Proton-proton
- B Proton-neutron
- C All of the above
- D Neutron-neutron
Explanation:
Question 356: Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their_____________?
- A pressure
- B absolute temperature
- C time
- D volume
Explanation:
Question 357: The turning effect of force is called_________?
- A Moment
- B Torque
- C Momentum
- D None of these
Explanation:
Question 358: An electric motor could be used as a: ___________?
- A Dynamo
- B Battery
- C Capacitor
- D Transformer
Explanation:
Question 359: Ceramic magnets are_______?
- A None of these
- B Semiconductors
- C Insulators
- D Conductors
Explanation:
Question 360: Which one of the following material is most suitable for making core of an electromagnet ?
- A soft iron
- B Cu-Ni alloy
- C steel
- D air
Explanation:
Question 361: 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 At L will be more than at C
- B At L will be less than at C
- C Different
- D Same
Explanation:
Question 362: If electrical conductivity increases with the increase of temperature of a substance, then it is a:
- A None of the above
- B Conductor
- C Insulator
- D Semiconductor
Explanation:
Question 363: In optic fiber transmission system _____________ are used regenerate the dim light signal?
- A Transformer
- B Laser
- C Diodes
- D Repeaters
Explanation:
Question 364: The SI unit of force constant is identical with that of__________________?
- A Loudness
- B Surface tension
- C Force
- D Pressure
Explanation:
Question 365: Michelson devised the formula to calculate the speed of light_______________?
- A C = 8fd
- B C = 4fd
- C C = 16fd
- D C = 5/2fd
Explanation:
Question 366: The force responsible for the vibratory motion of the simple pendulum is_________________?
- A mg cos?
- B mg
- C mg sin?
- D mg ton?
Explanation:
Question 367: An alpha particle in a single encounter__________________?
- A Loses no energy at all
- B Loses all of its energy
- C Loses a small fraction of its energy
- D Losses most of its energy
Explanation:
Question 368: When X-rays are passed through successive aluminum sheets what happens to their thickness ?
- A increases
- B sometimes increases and sometimes decreases
- C it remains same
- D it decreases
Explanation:
Question 369: 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 helix
- D an ellipse
Explanation:
Question 370: Two identical metal balls with charges + 2Q and
- A F/2
- B F
- C F/4
- D F/8
Explanation:
Question 371: According to Einstein, the gravitational interaction is possible between_______________?
- A material objects only
- B none of the above
- C material objects and electromagnetic radiation only
- D electromagnetic radiations
Explanation:
Question 372: If vectors a and b are antiparallel to each other then their resultant is ___________?
- A a?b
- B 2a
- C a+b
- D 2b
Explanation:
Question 373: An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a ______________?
- A Virtual input
- B Reference voltage on the other
- C Output
- D Non-inverting voltage at output
Explanation:
Question 374: When two charges are placed in water then the Coulomb force between them reduces to _____________?
- A 1/2 times
- B 1/58 times
- C 1/78 times
- D 1/3 times
Explanation:
Question 375: What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?
- A 2N
- B 10N
- C 1N
- D 100N
Explanation:
Question 376: The device used for conversion of D.C. to A.C. is called______________?
- A Converter
- B Oscillator
- C Inverter
- D A rectifier
Explanation:
Question 377: The dimension of velocity are __________?
- A LMT^-1
- B LT^-1
- C LT
- D LMT
Explanation:
Question 378: Null vector is a vector which has________________?
- A Zero magnitude
- B Both A and B are correct
- C Both A and B are not correct
- D No specified direction
Explanation:
Question 379: We have two bodies, One is moving with 2m/s velocity and other is at rest, which one has greater inertia?
- A Both have same inertia because inertia depends upon mass only
- B Body is at rest
- C Both have not any inertia
- D Moving body
Explanation:
Question 380: The existence of Ether wind was experimentally rejected by__________________?
- A double of its rest mass
- B zero
- C infinite
- D equal to its rest mass
Explanation:
Question 381: The audio signals of TV are _____________?
- A fixe modulated
- B Amplitude modulated
- C Frequency modulated
- D Velocity modulated
Explanation:
Question 382: Speed of efflux can be determined by applying______________?
- A Venture relation
- B All
- C Bernoulli
- D Torricelli
Explanation:
Question 383: An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?
- A 4
- B ?
- C 2
Explanation:
Question 384: Which of the following will be a better shield against gamma rays ?
- A Aluminum
- B Ordinary water
- C Heavy water
- D Lead
Explanation:
Question 385: An angle between two vectors A and B can be determined by_____________?
- A Right-hand rule
- B Head to tail rule
- C Their cross product
- D Their dot product
Explanation:
Question 386: Unit vector is used to specify the _____________?
- A Direction of vector
- B Magnitude
- C Velocity
- D Frequency
Explanation:
Question 387: Displacement of the body in S.H.M is equal to amplitude when the body is at_______________?
- A Elsewhere
- B Mean position
- C Extreme position
- D None
Explanation:
Question 388: Final image produced by a compound microscope is_____________?
- A real and inverted
- B real and erect
- C virtual and erect
- D virtual and inverted
Explanation:
Question 389: SI unit of the coefficient of viscosity is___________________?
- A Kg.m.S-1
- B Kg m-1.S-1
- C Kg.m.S
- D Kg-1.m-1.S-1
Explanation:
Question 390: A photon of wavelength 900nm behaves like a particle of mass______________?
- A 1.84 x 10-44kg
- B 2.46 x 10-36kg
- C 5.53 x 10-36kg
- D 0 kg.
Explanation:
Question 391: In scientific notation, numbers are expressed in________________?
- A Power of ten
- B Reciprocal
- C Decimal
- D Powers of two
Explanation:
Question 392: Who discovered the inverse square law for gravity ?
- A Plank
- B Galileo
- C Einstein
- D Newtons
Explanation:
Question 393: A body will be in complete equilibrium when it is satisfying______________?
- A 1st condition of equilibrium
- B Impossible
- C Both Ist and 2nd condition of equilibrium
- D 2nd condition of equilibrium
Explanation:
Question 394: The flow of ideal fluid is always_______________?
- A Straight line
- B Streamline
- C Irregular
- D Turbulent
Explanation:
Question 395: An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?
- A zero
- B 5 mH
- C 5000 H
- D 5 H
Explanation:
Question 396: A vector which has magnitude one is called _________?
- A A null vector
- B A resultant vector
- C A unit vector
- D A position vector
Explanation:
Question 397: At Murree Hills (Assume the value of g changes). If we use a simple pendulum as time standard then one-second duration will_____________?
- A Is zero
- B Increase
- C Remains the same
- D Decrease
Explanation:
Question 398: In the capacitive circuit the current___________________?
- A Is in phase with voltage
- B Opposite in phase of voltage by ?
- C Leads forward the voltage by ?/2
- D Lags behind voltage by ?/2
Explanation:
Question 399: A potential difference is applied across the ends of a wire. If the potential difference is doubled, then the drift velocity of free electron will.
- A be quadrupled
- B remain unchanged
- C be doubled
- D be halved
Explanation:
Question 400: Electromagnetic waves travel in free space with the speed of___________________?
- A Cathode rays
- B ?-rays
- C More than sound waves
- D Positive rays
Explanation: