TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 301: The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?
- A 4
- B 2
- C 3
- D None of these
Explanation:
Question 302: If Ax is -ve and Ay is +ve, the resultant is:___________?
- A 4th
- B 1st
- C 2nd
- D 3rd
Explanation:
Question 303: The normal blood pressure range for a human body is______________?
- A 60 to 140 torr
- B 120 to 80 torr
- C 120 to 60 torr
- D 100 to 80 torr
Explanation:
Question 304: Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
- A all of the above
- B the threshold frequency for the metal surface
- C the frequency of incident light and work function of the metal surface
- D the intensity of incident light
Explanation:
Question 305: In case of a simple pendulum, the cause of damping is__________________?
- A None of these
- B Tension in the string
- C Gravity
- D Drag force of air
Explanation:
Question 306: What is the SI unit of modulus of elasticity of substance ?
- A Nm-2
- B Being a number it has no unit.
- C Nm-1
- D Jm-2
Explanation:
Question 307: Field particle of Electromagnetic interaction is _________?
- A Vector Boson
- B Photon
- C Meson
- D Graviton
Explanation:
Question 308: The SI unit of Heat is________?
- A Watt
- B Volt
- C Newton
- D Joule
Explanation:
Question 309: The effect of the decrease in pressure with the increase of the speed of the fluid in a horizontal pipe is known as______________?
- A Venturi effect
- B Stokes effect
- C Bernoulli effect
- D Torricelli effect
Explanation:
Question 310: A choke is used as a resistance in_________________?
- A DC circuit
- B Both AC and DC circuit
- C AC circuits
- D Full wave rectifier circuit
Explanation:
Question 311: X-rays are similar in nature to_______________?
- A ?-rays
- B Beta rays
- C Positive rays
- D Cathode rays
Explanation:
Question 312: A cup of milk is placed in a microwave oven. Tell which statements is false. (1) Milk will be heated up only. (2) Cup will remain cool. (3) Both cup and mild will get hot ?
- A 3
- B 2
- C 1
- D None
Explanation:
Question 313: Unit vector n^ is along______________?
- A Normal on a surface
- B Y-axis
- C Z-axis
- D X-axis
Explanation:
Question 314: X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
- A The lines in a diffraction grating cannot reflect X-rays.
- B The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
- C The ions in a crystal are well arranged
- D The penetration power of X-rays is high in a diffraction grating
Explanation:
Question 315: If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________?
- A A. B = Ay Bz + Az By + Az Bx
- B A. B = Ax Bx + Ay By + Az Bz
- C A. B = Ax By + Ay Bz + Az By
- D A. B = Ax Bz + Ay By + Az Bx
Explanation:
Question 316: For chain reaction to build up the size of the radioactive target should be______________?
- A All of above can build up a change reaction
- B Greater than the critical size
- C Equal to the critical size
- D Less than the critical size
Explanation:
Question 317: A million electron are added to a pith ball. Its charge is________?
- A
- B
- C
- D
Explanation:
Question 318: Earth
- A 70 km/s
- B 45 km/s
- C 60 km/s
- D 30 km/s
Explanation:
Question 319: The frequency of the second pendulum is________________?
- A 1 hertz
- B 0.5 hertz
- C 1.5 hertz
- D 2.5 hertz
Explanation:
Question 320: Due to the relative motion of observer and frame of reference time:
- A Constant
- B Dilates
- C Contracts
- D Uniform
Explanation:
Question 321: Ina liquid metal fast breeder reactor, the type of uranium used is______________?
- A 92U238
- B 92U239
- C 92U235
- D 92U234
Explanation:
Question 322: If a diffraction grating is placed in the path of a light beam it reveals______________?
- A Wave property
- B Electromagnetic wave property
- C Energy particle
- D Particle property
Explanation:
Question 323: The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
- A 3.11 x 10-10m
- B 6.2 x 10-10m
- C 9.1 x 10-18m
- D 4 x 10-10m
Explanation:
Question 324: When K.E energy of SHM is maximum its__________________?
- A All P.E acceleration and restoring force are zero
- B Restoring force is zero
- C Acceleration is zero
- D P.E is zero
Explanation:
Question 325: The standard vector symbol for flux density is ____________________?
- A M
- B H
- C L
- D B
Explanation:
Question 326: Thermions are________________?
- A protons
- B photons
- C positrons
- D electrons
Explanation:
Question 327: An A.C series circuit containing 4? resistance and 3? inductive reactance. The impedance of the circuit is______________?
- A 1?
- B 7?
- C 5?
- D 7?
Explanation:
Question 328: Compton effect proves the________________?
- A Photon theory of light
- B Wave nature of light
- C Uncertain nature of light
- D Dual nature of light
Explanation:
Question 329: CGS system of units is also called __________?
- A Metric or French system of units
- B None of these
- C Metric system
- D Metric or British system of units
Explanation:
Question 330: One pico stands for_________________?
- A 10 raised to power -9
- B 10 raised to power -12
- C 10 raised to power -15
- D 10 raised to power -6
Explanation:
Question 331: To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
- A 4
- B 5
- C 3
- D 2
Explanation:
Question 332: Which of the following pair of forces can produce a resultant of 8N?
- A 2N & 5N
- B 20N & 2N
- C 3N & 6N
- D 4N & 1N
Explanation:
Question 333: Forward current through a semi conductor diode circuit is due to____________?
- A holes
- B electron
- C minority carriers
- D majority carriers
Explanation:
Question 334: pure resistor circuit the voltage and current are_______________?
- A Lagging each other
- B No phase difference
- C They are at 90? phase difference
- D They have zero phase difference
Explanation:
Question 335: Terminal velocity is_____________?
- A Neither uniform nor maximum
- B Maximum
- C Uniform
- D Uniform and maximum
Explanation:
Question 336: Which one of the following possesses greater penetration power ?
- A Neutron-rays
- B ?-rays
- C ?-rays
- D ?-rays
Explanation:
Question 337: Electron moves in the orbit as________________?
- A S.H.M likes the sound
- B Vibratory motion like up and down
- C Standing wave motion
- D Simple vibratory motion
Explanation:
Question 338: The device or circuit used for conversion of A.C. into D.C. is called_______________?
- A An amplifier.
- B A rectifier
- C Converter.
- D Filtering circuit
Explanation:
Question 339: The working of transistor as amplifier is similar to________________?
- A Step up transformer
- B Triode vacuum tube
- C Step down transformer
- D Three diodes in common
Explanation:
Question 340: Acceptor and donor impurities donate______________?
- A n-carriers only
- B p-carriers and n-carriers respectively
- C p-carriers only
- D n-carriers and p-carriers respectively
Explanation:
Question 341: Bernoulli
- A None of these
- B Laminar flow
- C Both laminar and turbulent flow
- D Turbulent flow
Explanation:
Question 342: In S.H.M. the velocity of a particle is maximum at________________?
- A middle between the mean and extreme position on the right side
- B extreme position
- C middle between the mean and extreme position on the left side
- D mean position
Explanation:
Question 343: Radioactive decay obeys which one of the following law ?
- A N=Noe-?t
- B N=Noe?t
- C N=Noe-?t/2
- D No=N(1+e?t)
Explanation:
Question 344: Metabolism is the name of a process in which energy transformation takes place within______________?
- A Heat engine
- B Laboratory
- C Human body
- D Atmosphere
Explanation:
Question 345: The equation of continuity is obtained by applying in the law of conservation of_____________?
- A Momentum
- B Energy
- C All
- D Mass
Explanation:
Question 346: In full wave rectification the output D.C. voltage across the load is obtained for_____________?
- A The complete cycle of input A.C.
- B The negative half cycle of input A.C.
- C The positive half cycle of input A.C.
- D All of the above.
Explanation:
Question 347: Sphygmomanometers measures blood pressure ?
- A Statically
- B None of these
- C Some time static and sometimes dynamic
- D Dynamically
Explanation:
Question 348: A black body has the property to _____________ all the radiation entering it.
- A Reflect
- B None of these
- C Absorb
- D Exude
Explanation:
Question 349: Which of the following radiations are suitable for the treatment of an infection in the interior of the body ?
- A ?-rays
- B ?-rays
- C X-rays
- D ?-rays
Explanation:
Question 350: A capacitor of capacitance 30
- A 0.9sec
- B 0.9x102sec
- C 1.5x105sec
- D 15 sec
Explanation: