Question Booklet Series
PHYSICS CODE 14

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KL-14/Phy Series-A
0·1. The dimensional formula for Planck's constant and angular momentum are respectively and [MLCrl and [i1LCr l
[ML1T and [MlcrcJ [Mlr and [Mlr
0·2. Which of the following implies the greatest precision?

10.1 10.10


10.100 10.1000


0·3. Which of the following is NOT one of the fundamental quantities in physics?

time length


weight mass


0.4. SI unit of the power ofa lens is

diopter


horse power

metre

watt
0·5.ln physics, a radian per second is a unit of

angular displacement


angular velocity

angular acceleration

angular momentum.
0·6. Dimensions of coefficient of viscosity is:
[MCl 2TC] • [MClTC]
[ML·1r1]
[MLTC]
0·7. A body of mass m moving with velocity u collides with a stationary body of mass 2 m and coalesce to form one body. The speed of the system aller collision. is u/3 2u u/4
O·S.For an object moving in uniform circular motion with constant speed. the direction of The instantaneous acceleration vector is

tangent to the path of motion equal to zero


directed radially outward


directed radially inward
0·9.The acceleration due to gravity on the moon is 1.6 meters per second square. On the moon, the time period of a pendulum whose length is 6.4 meters will be

rr seconds 2rr seconds


4rr seconds Srr seconds


0·1 0.8emoulli·s Principle is a statement of

energy conservation in dynamic fluids.


momentum conservation in dynamic fluids.


hydrostatic equilibrium. (D)thennal equilibrium in fluids.


O·II.The velocity of a body depends on time as v 20 0.1t2. The body is undergoing Q.12.In any collision, the parameter which is conserved is
unifoml acceleration uniform retardation.
non-uniform acceleration non-uniform retardation
KLI4/Phy Series-A



kinetic energy angular momentum


linear momentum potential energy



Q.13. The work done by any friction force is:

always positive


always negative


always zero


either positive or negative depending upon the situation.



Q.14. A person moves 3m tovards East and then 4m towards N0l1h. The resultant displacement
from the initial position to final position is
5m

4m 1m

Q.15. A student goes from his house to school on his bicycle .The distance traveled by him is
given by the relation where distance x is in metres and time t is in seconds. The acceleration of his bicycle after 30 seconds is

360m/s1 120m/s1


36 m/s1 12 m/s2



Q.16. Two physical quantities having the same dimensions are

force and energy work and torque


pressure and power impulse and momentum


Q.17. The viscous force acting on on a solid ball moving in air with terminal velocity v is directly proportional to
"Iv v II!v v2
Q.18.A p31iicle of mass mo moves with speed 0.8c. where c is the speed of light in vacuum. The relativistic kinetic energy of the p311icle is nearly

1.66moc2 moc-J


0.32 moc2 0.66 moc1


Q.19.In a unifom1 circular motion

velocity and acceleration both are constant


acceleration and speed are constant but velocity changes


acceleration and velocity both change


acceleration and speed both are constant


Q.20.A motor cyclist moving with a velocity of 72km/hr on a flat road takes a tum at a point where the radius of curvature of the rod is 20m(g=1Om/sln order to avoid sliding, he must not bend with respect to the vertical by an angle egreater than

2 4


tan-I 6 tan-I 25.92


KL14/Phy Series-A
Q.21. A particle of mass 0.5 kg is moving in a circle of radius 0.1 m with a constant speed of 2.0m/s. Its acceleration at any moment is

zero· lOm/s2


25 m/s2 40m/s2


Q.22. If the kinetic energy of a body becomes four times its initial value, the new momentum vill be

three times the initial value four times the initial value


two times the initial value unchanged


Q.23. A ship of mass 3x 107 kg initially at rest can be pulled through a distance of 3m by means of force 5x 10-t N. The water resistance is negligible. The speed attained by the ship is
O.Im/s 0.5m/s I.Om/s (D)5.0m/s
Q.24.Ifthe radius of the emih were to shrink, its mass remaining the same, the value of acceleration due to gravity at the pole and at the equator will

increase and decrease respectively decrease and increase respectively


increase at both places (D)decrease at both places


Q.25.Lorentz transformation equations hold for

non-relativistic velocities only


relativistic velocities only


all velocities: relativistic non-relativistic


photons only


Q.26. A particle is dropped from a point above the earth. The ratio of the distance travelled in the first two seconds and in the next two seconds is
I 1:2 1:3 1:4
Q.27. A mass M when attached to the lower end of a mass less spring, whose upper end is fixed, extends it by L. In the extended equilibrium state of the spring, the restoring force exerted by the spring on the mass is
Mg Mg/2 2/Mg Zero
Q.28. Under the influence of a transverse magnetic field, an electron moves in a circle with constant speed v. The time period of revolution is

proportional to v propOliional to v2


proportional to -Vv independent of v


Q.29. The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. The period ofoscillation is
100.00 s 10.00 s
(C)O.IOs 0.01 s

KL14/Phy Series-A Q.30. The equation. x a cos (wt represents

accelerator due to gravity unifoll11 straight line motion


dc current (O)simplc harmonic motion



Q.31. Relative to its period on the earth. the period of a pendulum on the moon is

shOlier longer


the same as on the ealih varies with time



Q.32. The phenomenon that cannot take place in sound waves is

reflection interference


dimaction polarization



Q.33.A semiconductor is cooled from 339K to 302K. Its resistance will

decrease


increase


remain unchanged


first increase then decreases


Q.34.The speed of sound in air is v. the fundamental frequency of the air column in a pipe of length L closed at one end is
v/4L v/2l 3v/4l v/L
Q.35.A particle executes S.H.M of amplitude a. Its kinetic energy is equal to potential energy when the displacement of the particle from the mean position is

0.512a 0.709a


0.827a 0.983a


Q.36.Ultrasonic waves are used in SONAR with greater advantage because ultrasonics

have low frequency have short wavelength


are electromagnetic waves can be easily produced


Q.37. The equation ofa S.H.M is y=8 sin (2x-40t).where the distances and time are in centimeter and second respectively. The speed of the wave is

2.0cm/sec 20cm/sec


30cm/sec 40cm/scc


Q.38. The velocity of sound in air is 330m/s. The velocity of an observer who observes drop of 10% in the sound from a stationary source is

30 m/s 33m/s


297m/s 330m/scc


Kl14/Phy Series-A
0.39. The displacement y of a particle as a function of time t is given by y eju1 wherea isa constant and From amongst the following. the correct statement is

the motion is not simple hanllonic motion


the motion is simple harmonic motion only if a is positive


the motion is simple harmonic motion only if a is negative


the motion is simple harmonic motion for all values of a



Q.40. Spherical aberration in a thin lens can be reduced by

using monochromatic light


using a doublet combination


using a circular annular mask over the lens


increasing the size of the lens


Q.4I. The equation of a wave propagating in a medium is y a sin where y is the displacement of the palticle in the medium at a distance x at any instant t. The correct statement is

The velocity of the wave is a.


The wan is advancing in the negative direction of the x-axis.


The wavelength is k/2n-.


The frequency of the wave is a.


Q.42. The speed of a wave is 360 m/s and the frequency is 5 heltz. The phase difference between two points is 60° . The path difference between them will be
0.72 m 1.20m 12.00 m 120.00 m
Q.43. The ratio of intensities of tVO waves is I.: 9. If these waves produce interference, the ratio of maximum to minimum intensities will be
I:4 I I I
Q.44. A thin transparent plate of polaroid is placed on another similar plate such that the angle between their pass axes is .The ratio of intensities ofemergent and unpolarised incident light will be

Q.45. The velocity of light emitted from a source S as measured by a stationary observer 0 is c. If the observer moves with a velocity v towards then velocity oflight as seen by him will be
c+v c-v c /e2
Q.46. The concept that each point on a wave front may be considered as a new wave source is
given by
Snell's Law Huygen's Principle
Young's Law Hertz's Law

-KLl4/Phy Series-A
L­
Q.47. A light ray of wavelength 5895Ao travelling in vacuum enters a medium of refractive index 1.5. The wavelength of the ray in the medium is

3930 AO 4200 Av


5495 AO 7893 An


Q.48. A point object is placed at the focus A of a double concave lens offocallength f. Its image will be formed at a point

between the point A and the lens


at a distance between f and 2f from the lens


at a distance more than 2f from the lens


infinity


Q.49. The resolving power of a plane transmission grating (having 15000 rulings on the grating surface) in the second order is

15,000 30,000


45.000 60,000



Q.50. The speed of light in a medium of refractive index 1.5 is nearly
(A)4.5xIO"m/s (8)3.0xI0"m/s
2.0 x 10xm/s 1.0 xI0' "m/s
Q.51. In Young's double slit experiment, the separation between the slit is halved and the distance between the slit and the screen is doubled. The fringe width will

remain unchanged be halved


be doubled increase four times


Q.52.Cal11ot engine works between temperatures 727°C and 27° C. The efficiency of the engine
IS
70% 30% 10%
Q.53.Which of the following ten11S refer to the amount of heat needed to raise the temperature of a unit mass ofa substance through one degree?

Heat of fusion Liquification heat


Internal heat Specific heat



Q.54. At what point is the temperature the same on the Celsius and Fahrenheit scales?

absolute zero zero


negative 40 degrees never



Q.55. Heat from the sun reaches the earth by

conduction convection


radiation All of the above



Q.56. The principle that energy may be converted from one fonn to another but it cannot be
either created or destroyed is
first law ofthemlOdynamics. second law ofthelIDodynamics.
third law of thermodynamics. principle of photo electricity.
KL 14!Phy Series-A 6


0.57. The spectral energy distribution of a star at temperature 6050 K has a maximum at 4753Ao.The temperature of the star which this maximum is at 9506 A(J is

6050K 3025K


12100K 24200K


0.58.The 1111S speed of oxygen molecules at room temperature is 500m/s. The n11S speed of
Il
hydrogen at the same temperature is t1early

31 m/sec 125 m/sec


2000m/sec 8000m/sec


0.59. The temperature of a body is increased from 27°C to 127° C. The radiation emitted by the body increases by a factor

81/256 27/l27


27/64 256/81


0.60. Copper of mass 200gm is heated from 25° C to 75° C The specific heat of the copper is
0.1 cal/gm/oC . Assuming the change in volume to be negligible, the change in intemaJ energy of the copper block is

1O0 joule 420 joule


lOOOjoule 4200 joule


Q.61. Tvo electric bulbs have resistances in the ratio 1:2. If they are joined in parallel to a d.c. source, the energy consumed in them is in the ratio
1:2 2:I 4:1 l:l

Q.62. The path of a free electron in a metal is

parabolic circular


a straight line zig-zag


0.63.When an electric fuse is rated 8 it means

it will not work if cun'ent is less than 8 A


it has a resistance of 8n


it will work only ifcurrent is 8 A


it will melt if current exceeds 8A


Energy consumed, in joules, by a 100-watt light bulb operated for 10 minutes is

10 1000


36,000 60,000


Kt14/Phy Series-A 7







L
0.65. The relative orientation of the magnetic and electric fields associated with an electromagnetic wave is

180 degree 90 degree


45 degree 22.5 degree


0.66. The magnetic lines of force produced by a linear CUlTent carrying conductor are

in the direction of the current


in a direction opposite to that of current


pClvendicular to the cUlTent


conccntric circles around the wirc


0.67,30 coulomb of chargc flowing through a wire pcr minute is (A)0.8xI0-I9A (B)0.5A
1.0A (D)30A
0.68.An electron is brought towards another electron. The electric potential energy of the system

decreases increases


does not change becomes zero


0.69. The separation between the plates of a parallel plate capacitor is d. A metal sheet of thickness d/2 is insel1ed between the plates. The ratio of the capacitance after the insertion of the sheet to that before insertion is

1 I


I 1:2


0.70.The resistivity of a wire varies with its

length cross-section


mass material


0.71. A wire has a resistance 4 Q. The resistance of another wire of the same length and material, but having double diameter will be
1 Q n n 16n
0.72. Kirchhoffs first law for analyzing electrical circuits is based on the conservation of

energy mass


momcntum charge


0.73. The number oftums in a coil is doubled. Its self-inductance becomes

four times doubled


halved squared


0.74. In an a.c. circuit. is consumed in
inductance only capacitance only
(el resistance all the three

Series-A


Q.75.A charge Q is placed at the centre of a cube. The flux of the electric field through the six
surfaces of the cube is
Q/£o Q/2£0 Q/6£0 Q/24£0
Q.76. The permanent magnetic moment of the atoms of a material is zero. The material is
paramagnetic diamagnetic
ferromagnetic ferrimagnetic
Q.77. An a.c. source supplies an emf given by sin 00S,1)t. The average value over
one cycle and rms value of the voltage are respectively
and volt 15 volt and volt
0 and volt 15 volt and 30"";2 volt
Q.78. In a series circuit connected to an a.c supply, the power factor at resonance is
1.0 0.5 0.1 zero
Q.79. The energy required to set up a dc current of0.4 ampere in a coil of self-inductance 0.2
Henry is
16 x 10"jouies 8 x 10"joules
4 x 10"jouies I x lO"joules
Q.80. A conducting hollOv sphere of radius R meters is given a charge of Q coulomb. The
electric potential at a point a distance R/2 from the centre of the sphere is
(Qi4TC£(l volt (Q/4TC£0 volt
infinity zero
Q.81. The plates of a parallel plate condenser C I. each of area are a distance d apal1. The
medium between the plates is air. Another parallel plate condenser with area of plate
2A and plate separation dl 2 has a medium of dielectric constant 2 between the plates. The
ratio of the capacitance ofCI and is
1:4
Q.82. If the dielectric constant ofa material is its permittivity is nearly
..+O.5·x 26.5x10,12mks IC) 10.5"10' 2mks 1.5xlO,l:'mks
Q .83. The S.I unit of electric tlux is
volt/meter meter/volt
volt. meter volt.n/
Q.84. The energy ofan X-ray photon is 2 keY. Its frequency, in units ofhet1z, is nearly:
3.2 x 10.17 5 X 17 2xl017 2 x 1018
KL14/Phy Series:-A 9

Q.R5. The ratio of mass of a proton and that of an electron is approximately

200 2000


20,000 2,00,000






Q.86. Interference phenomenon of light demonstrates

pmiicle nature of light wave nature of light


transverse nature of light dual nature of light


Q.87.How many quarks make up a neutron'?
I

Q.88. For the hydrogen atom, the series which describes electron transitions to the 2 state is

Lyman series Paschen series


Balmer series Pfund series



Q.89. The photoelectric effect is a demonstration of:

the wave nature of light the particle nature of light


inelastic collision of electrons the continuous spectrum of radiation


Q.90. TVio charges Q and 9Q are placed at a distance of 40cm from each other. From charge the distance of the point on the line joining the two charges at which the value of electric field is zero is
Scm IOcm 20 cm 30cm

Q.91. Among the below given vavelengths in AU, the hardest x-rays correspond to
Ixl02 IxlO I 1 IxIO·1

Q.92. What does the letter "s" stand for in the acronym laser?

scientific sinusoidal


stimulated solar


Q.93. The radioactivity ofa material drops to III 6th of its initial value in a period of 16 years. The half-life period of the material is

2 years (Bl4 years


8 years 16 years


Q.94. The energy of hydrogen atom in the ground state is -13.6eV. In the energy level n 5. its energy will be

-0.54 Ev -0.85Ev


-2.72Ev -5.4eV


Q.95. An a-particle is emitted by a nucleus ofradium 88Ra226.The atomic number and the mass number of the residual atom are respectively

84 and 224 86 and 224


84 and 226 86 and 222


KLl4P!1 Series-A Q.96. During a negative beta decay


an atomic electron is ejected


an electron which was already present within the nucleus is ejected


a neutron in the nucleus decays emitting an electron


a part of binding energy of the nucleus is convcl1ed into an electron


Q.97. The minimum wavelength ofX-rays produced by electrons accelerated by a potential difference of V volt is
eV/hc eh/cV
hclEv hlV
Q.98. In a transistor, the relation between emitter-current base-culTent iband collector­current ic is
ic iE -ib ib iE -ic
iE ic -ib None of these

Q.99. A p-n junction diode can be used as

modulator amplifier


oscillator rectifier


Q.IOO. The NAND gate is an AND gate followed by

NOT gate OR gate


AND gate NAND gate


KLl4/Phy Series-A 11