TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 601: The distance between any two consecutive nodes or antinodes in a stationary wavelength (?) is _________?
- A ?/2
- B ?
- C ?/8
- D ?/4
Explanation:
Question 602: The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
- A Zero
- B 90
- C 180
- D 45
Explanation:
Question 603: According to which one of following law the density of atom is uniform ?
- A Rutherfords model
- B All of the above laws contradict the statement
- C J.J.Thomson model
- D Bohrs model
Explanation:
Question 604: Standard condition STP refer to a gas at ___________________?
- A 760mm 273K
- B 76cm 0
- C 1atm 273K
- D all of the above
Explanation:
Question 605: Name the SI unit having the symbol cd?
- A Cm
- B Second
- C Candela
- D Ampere
Explanation:
Question 606: Kirchhoff
- A junction voltages
- B both
- C Battery emf
- D IR Drops
Explanation:
Question 607: I ^. (j^ x k^) is equal to______________?
- A j^
- B k^
- C i^
- D 1
Explanation:
Question 608: If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
- A At the lowest point
- B At the highest point
- C At any point during motion
- D At the point where gravity is not acting
Explanation:
Question 609: A convex lens acts as a diverging lens if the_________________?
- A both B and C
- B if the object is within f
- C if the object is with in C
- D object is beyond C
Explanation:
Question 610: In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
- A The capillary tube is very narrow
- B The amount of mercury use is very small
- C The capillary tube has a small constriction near the bulb
- D Mercury takes a long time to contract
Explanation:
Question 611: In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?
- A 20km
- B 300km
- C 100km
- D 200km
Explanation:
Question 612: Random errors can be reduced by_______________?
- A Taking zero correction
- B All methods explained in A, B and C
- C Comparing the instrument with another more accurate one
- D Taking mean of several measurements
Explanation:
Question 613: Which of the following is used to control rods in nuclear fission?
- A All of these
- B Heavy Water
- C Graphite
- D Cadmium
Explanation:
Question 614: If n number of the photon is striking on a metal surface then total momentum exerted is_______________?
- A None
- B p
- C n
Explanation:
Question 615: If the wavelength of incident radiation is increased in photoemission then_________________?
- A The average kinetic energy of the photoelectrons decreases
- B The maximum kinetic energy of the photoelectrons increases
- C The minimum kinetic energy of the photoelectrons decreases
- D The minimum kinetic energy of the photoelectrons increases
Explanation:
Question 616: The metastable state for an atom in laser light is_____________?
- A 10-4 sec
- B 10-3 sec
- C 10-5 sec
- D 10-8 sec
Explanation:
Question 617: Unit of power of a lens is________________?
- A watt
- B horsepower
- C diopter
- D meter
Explanation:
Question 618: In n-p-n transistor, p works as______________?
- A emitter
- B any of above
- C base
- D collector
Explanation:
Question 619: A three-dimensional image is obtained by________________?
- A Electron microscope
- B Scanning electron microscope
- C Magnetic imaging
- D None of the above
Explanation:
Question 620: If an object is placed away from 2f of a converging lens then the image will be_______________?
- A real and inverted
- B real and erect
- C virtual and erect
- D virtual
Explanation:
Question 621: In an angular motion, Newton
- A F=ma
- B F=?p/It
- C ?? = I ?
- D All above
Explanation:
Question 622: The charge on neutron is_______________?
- A Minus 1.6 x 10-19C
- B No definite charge
- C Plus 1.6 x 10-19C
- D Zero
Explanation:
Question 623: Neutron was discovered by: _________?
- A Rutherford
- B Chadwick
- C Neil Bohr
- D Einstein
Explanation:
Question 624: Medium which sends signal from source to destination is known as ________ ?
- A Hardware
- B Transmitter
- C Receiver
- D Transmission channel
Explanation:
Question 625: Mark the wrong statement ?
- A all the frames of reference in uniform rectilinear motion are equivalent
- B an un-accelerated frame of reference is called an inertial frame of reference
- C Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
- D a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
Explanation:
Question 626: The light used in optical fiber transmission is________?
- A Pentachromatic
- B Monochromatic
- C None of these
- D Dichromatic
Explanation:
Question 627: The number of categories in which physical quantities are divided is_____________?
- A 2
- B 3
- C 1
- D 4
Explanation:
Question 628: Product of wavelength and time period is _______________?
- A Wavelength
- B Time period
- C Frequency
- D Velocity
Explanation:
Question 629: Which one of the following has the largest energy content ?
- A 102 photons of wavelength 1nm (x-rays)
- B 103 photons of wavelength 2 pm (?-rays)
- C 106 photons of wavelength 200nm (UV)
- D 106 photons of wavelength 50?m (infrared)
Explanation:
Question 630: Forced vibration is known as_____________________?
- A Driven harmonic vibration
- B Free vibration
- C Simple harmonic vibration
- D Natural vibration
Explanation:
Question 631: 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 r.m.s current
- B Average current
- C Sinusoidal current
- D Net current
Explanation:
Question 632: The efficiency of the Carnot engine working between 150
- A 29.4%
- B 23.6%
- C 100%
- D 50%
Explanation:
Question 633: Total distance travelled by a bob of the simple pendulum in one vibration is equal to________________?
- A 2 x amplitude
- B Amplitude
- C 4 x amplitude
- D Square of the amplitude
Explanation:
Question 634: A 100
- A 100?
- B 50?
- C 32?
- D 62?
Explanation:
Question 635: Two parallel wires carrying currents in the opposite directions____________________?
- A have no effect upon each other
- B they cancel out their individual magnetic fields
- C attract each other
- D repel each other
Explanation:
Question 636: An inductor may store energy in ________________?
- A Both electric and magnetic fields
- B Its coils
- C Its magnetic field
- D Its electric field
Explanation:
Question 637: Which one of the following has the highest value of specific heat?
- A Alcohol
- B Methane
- C Kerosene
- D Water
Explanation:
Question 638: The core of a transformer is laminated to reduce energy losses due to__________?
- A Resistance in winding
- B Hysteresis
- C None of these
- D Eddy currents
Explanation:
Question 639: During an encounter with an atom alpha particle knocks out ______________?
- A Nothing
- B Protons
- C Neutrons
- D Electrons
Explanation:
Question 640: To find the r.m.s value of an alternating current mathematically we need to have ________________?
- A Square of 1/2
- B Mean value of I2
- C Square root of mean value of I2
- D Square root of I2
Explanation:
Question 641: The ratio of displacement to distance can not be___________?
- A Less than one
- B Greater than one
- C Equal to one
- D All are possible
Explanation:
Question 642: The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?
- A The switch
- B The photo diodes
- C Solar cells.
- D The light emitting diode
Explanation:
Question 643: Which of the following can not be the resultant of two vectors having magnitude 10N and 15N?
- A 18N
- B 30N
- C 25N
- D 22N
Explanation:
Question 644: The acceleration of a projection on the diameter for a particle moving along a circle is_______________?
- A w2x
- B wx2
- C w2x
- D wx2
Explanation:
Question 645: 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 = VL2+(VR-VC)2
- B V2 = VR2+VL2+VC2
- C V2 = VR2+(VL-VC)2
Explanation:
Question 646: An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?
- A one meter
- B greater than one meter
- C less than one meter
- D a foolish question
Explanation:
Question 647: Which of the following is reverse process of composition of vectors?
- A Subtraction of vectors
- B Multiplication of vectors
- C Addition of vectors
- D Resolution of vectors
Explanation:
Question 648: Ratio of the weight of H-atom to that of an electron is approximately______________?
- A 18360
- B 1836
- C 183.6
- D 18.336
Explanation:
Question 649: A satellite moving around the earth constitutes______________?
- A Both inertial and non-inertial
- B Non-inertial frame
- C Neither inertial nor non-inertial
- D An inertial frame of reference
Explanation:
Question 650: The symbol of the prefix used for Mega is_______?
- A h
- B G
- C M
- D E
Explanation: