# NEET MCQ for Physics 18

NEET MCQ for Physics 18

Q.1.The conductivity of semiconductors like Ge and Si:
A) Increases when it is doped with pentavalent impurity.
B) Increases when it is doped with trivalent impurity.
C) Increases when it is doped with pentavalent or trivalent impurity.
D) None

Q.2.The velocity of a body depends on time as v=20 +0.12. The body is undergoing
A) Uniform acceleration
B) Uniform retardation
C) Non-uniform acceleration
D) Non-uniform retardation

Q.3.In simple harmonic motion along X-axix , for a particle force is given by
A) –Akx
B) Acoskx
C) A exp(-kx)
D) Akx

Q.4.An oscillator is an amplifier with:
A) A large gain
B) Negative feedback
C) Positive feedback
D) No feedback

Q.5.A signal of 5kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequency of the resultant signal is/are
A) 2 KHz only
B) 2005 kHz, and 1995 kHz
C) 2005 kHz, 2000 kHz and 1995 kHz
D) 2000 kHz and 1995 kHz

Q.6.In an experiment for determination of refractive index of glass of a prism by i−δ. plot, it was found that a ray incident at angle 35o, suffers a deviation of 40° and that it emerges at angle 79o. In that case which of the following is closest to the maximum possible value of the refractive index?
A) 1.5
B) 1.6
C) 1.7
D) 1.8

Q.7.A block of mass m is placed on a surface with a vertical cross section given by y = x/6. If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is
A) 1/6m
B) 2/3m
C) 1/3m
D) 1/2m

Q.8.Which substance has maximum value of Young’s modulus of elasticity?
A) Steel
B) Rubber
C) Wood
D) Plastic

Q.9.By which of the following process some stars which are of the size of Sun or smaller convert hydrogen to helium?
A) Triple-alpha process
B) Proton Proton Chain Reaction
C) CNO Cycle
D) R process

Q.10.Which among the following property of the matter is studied in “Rheology”?
A) Gravitation
B) Viscosity
C) Magnetic Properties
D) Entropy

Q.11.Mercury is used in barometer because
A) It is the most dense liquid
B) It is sparkling
C) It does not wet the tube of barometer
D) All of these

Q.12.If rotational speed of the earth about its axis of rotation is increased then weight of a body on equator would be
A) Increase
B) Decrease
C) Unchanged
D) Sometime increases and sometime decreases

Q.13.At critical temperature, value of surface tension of a liquid is
A) Zero
B) Infinity
C) Maximum
D) One

Q.14.Which among the following phenomena of the optics makes the Endoscopy capable of examining the internal organs such as Abdomen?
A) Interference
B) Total Internal Reflection
C) Diffraction
D) Scattering

Q.15.A piece of Ice was tied with a string to a water bucket’s bottom, and the water bucket was filled with water with ice fully submerged in it. What would be the impact on the level of water when the ice melts away completely?
A) The level of water will go up
B) The level of water will go down
C) The level of water will remain unchanged
D) The level of water will first increase then come to the previous on

Q.16.What do we call the part of the “DTH Satellite dish” that converts the signals from electromagnetic or radio waves to electrical signals?
A) Orthomode transducer (OMT)
B) Low-noise block converter (LNB)
C) Block upconverter (BUC)
D) Parabolic Dish

Q.17.Which among the following component of a fluorescent lamp contributes maximum in making them costly?
A) Mercury vapor
B) Light-emitting phosphors
C) Ballast
D) Filament

Q.18.Which among the following is a Beyond-visual-range air-to-air missile
A) Agni
B) Prithvi
C) Astra
D) Nag

Q.19.Viscosity is that property by virtue of which a liquid
A) Opposes the relative motion of its own different parts
B) Repels its nearby molecules
C) Attracts the other molecules
D) Becomes conductor

Q.20.Which among the following is used to listen and record underwater sounds?
A) Altimeter
B) SONAR
C) Hydrophone

Q.21.First steam-powered vehicle was built by?
A) Richard Trevithick
B) Nicolas-Joseph Cugnot
C) Don Walsh
D) Janice Meek

Q.22.The scientists have discovered that Milky Way is having two components, the disc and spherical. What may be the central object of Milky Way?
A) A Black Hole
B) A Neuron star
C) Vaccum
D) A Large Magellanic Cloud

Q.23.Siphon will fail to work if
A) The densities of the liquid in the two vessels are equal
B) The level of the liquid in the two vessels are at the same height
C) Both its limbs are of unequal length
D) The temperature of the liquids in the two vessels are the same

Q.24.Out of the following, which is not emitted by radioactive substance?
A) Electrons