CBEAS

PHYSICS    CHEMISTRY    MATHEMATICS    ENGLISH

1. The dimension of the ratio of angular to linear momentum is.

[M0L1T1][M1L1T0][M0L0T1][M0L1T0]

2. If L is inductance, R is resistance, the unit of L/R would be.

frequencytimetime/ohmunit less

3. The unit of relative permittivity:

FaradFarad/mHenery/mIt is unit less

4. The dimensions of angular momentum is

[MLT-1][ML2T-1][ML-1T][MLT-2]

5. Statements:

a. A dimensionally correct equation is always correct.

b. A dimensionally incorrect equation is always incorrect.
c. A dimensionally correct equation may be incorrect.

d. A dimensionally incorrect equation may be correct.

b, c true c, a truec, d truea, d true

6. Which of the following is the vector quantity?

electric chargeelectric potentialcharge densityelectric field intensity

7. The component of a vector is:

always less than its magnitudealways greater than its magnitudeequal to its magnitudenone

8. A body covers half of its journey at 13 km/hr and other half at 39 km/hr. What is his average velocity during whole journey in km/hr?

zero39/22613/3

9. When a ball is thrown up in a bus moving with uniform velocity, then the ball fell down..............the man.

in front ofbehindat hand ofeither a. or b.

10. A man in a moving train, tosses a coin, if the coin falls behind him, the train must be moving with

+ve acceleration-ve accelerationuniform velocityvariable acceleration

11. A man in a lift will weigh more when

lift accelerates upwardlift descends freelylift accelerates downwardit is going up with slowing

12. A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. A force F is applied at the free end of the rope. The force which the rope exerts on the block is:

Fm/(M+m)FM/(m+M)Fm/(M-m)FM/(M-m)

13. For a projectile fired at equal inclination to horizontal and vertical line with velocity u, the horizontal distance traveled is:

u2/gu2/2gu2/4g2u2/g

14. The range of a projectile fired at an angle 15o is 50 m. If it is fired with the same speed at an angle of 45o; its range will be:

100m150m200m400m

15. Which of the following states possesses greater PE?

SolidLiquidGasNone

16. Two bodies having masses in ration 1:2 and moving with same momentum have KE in ration.

2:11:21:14:1

17. Two particles of masses 4 kg and 16 kg are moving with equal KE, what is the ratio of their linear momentum?

1/41/21/81/16

18. Work done by conservative force around closed loop is:

>1<10infinity

19. A body of mass m is moving with velocity v collides head on with another body of mass 2m which is initially at rest. The ratio of their K.E. before and after the collision will be:

3:11:39:11:9

20. The centre of gravity of a body:

lies always outside the bodymay lie whether outside or on the surface of the body
lies inside the body        lies on the surface of the body

21. When a body moves with a constant speed along a circle

it has no accelerationit has no force acts on the body
its velocity remains constantwork done by the tension in the string is zero

22. A body with a constant speed v in a circle of radius r. Its angular acceleration is:

v.r.v/rzeror/v

23. If the earth suddenly looses quality to attract things,

the mass will vanishthe weight will vanishboth mass and weight will vanishNone

24. A satellite fired from earth with an initial velocity of 11 km/s describes

a circular orbita parabolic orbithyperbolic orbitan elliptical orbit

25. If the earth stopped rotating, the weight of objects at the equation would be:

greaterlessbe the same as beforeNone

26. The time period of revolution of a satellite around a planet of radius R is T. Period or revolution around another planet whose radius is 3R is:

T3T9T3Ö3T

27. The ratio of maximum acceleration to the maximum velocity of a particle performing SHM is equal to

ww21/wAw

28. A pendulum clock that keeps correct time on the earth is taken to the moon. It will run:

at correct rate6 times fasterÖ6 times fasterÖ6 times slower

29. A pendulum stops due to :

gravitylack of energyair frictionits mass

30. The moment of momentum is called

coupletorqueimpulseangular momentum

31. Ice skaters use the principle of conservation of ... for spinning.

angular momentumtorquemoment of inertiaradius of gyration

32. Moment of inertia of a body does not depend upon its:

massdistribution of massangular velocityaxis of rotation

33. A wheel rotates with a constant acceleration of 2 rad./s2. If the wheel starts from rest, the revolution made by a wheel in the first 10 seconds will be:

481216

34. Young's modulus of a perfectly plastic body is

0infinite1finite

35. Share modulus of liquid is

0infinite1finite

36. In order to elongate the given wire to double its length, one requires stress

infinite magnitudeequals to Ydouble to Yhalf to Y

37. The work done per unit volume in stretching the wire is equal to

stress×strength(Stress)2/2Y(strain)2/2YAll of the above

38. A piece of ice is floating in beaker containing water when the ice melts, then the level of water

risesfallsremains samefirst increase then decrease

39. At terminal velocity, the quantity that terminates is

velocityaccelerationmomentumenergy

40. With the rise of temp., the coefficient of viscosity of liquid

increasesdecreasesremains constantNone

41. Two equal drops are falling through air with a steady velocity of 5cm/sec. If the drop coalesce, the new terminal velocity will be

10 cm/sec5Ö2 cm/sec5×(4)1/3 cm/sec5×(2)1/3 cm/sec

42. When two tubes of different diameters are dipped vertically, the rise of liquid is

same in both tubesmore in tube of larger diametermore in tube of smaller diameternone

43. When salt is added to pure water, the surface tension

increasesdecreasesbecomes zerounchanged

44. When water is heated from 0oC to 10oC, its volume

increasesfirst increases then decreasesdecreasesfirst decreases then increases

45. When a flame is held to a bulb of Hg in glass thermometer, the Hg level will

risedropdrop and then riserise and then drop

46. A metal sheet with a circular hole is heated. The hole gets

largersmallerdeformedall

47. Triple point of water (temperature) is

-273 K-273.14 K-273.15 K+273.16 K

48. When a given amount of water is heated from 0oC to 100oC in a closed vessel then the total mass of water after condensation

remains unchangeddecreases slightlyincreases slightlyincreases substantially

49. Meat takes longer time to cook.

at sea levelin a submarine 100 m below the sea levelat the top of Mt. Everestin Kathmandu

50. Which of the following has has high specific heat capacity?

AlH2OO2H2

51. Meeting point of ice

increases with the increasing pressuredecreases with increasing pressure
is independent of pressureis proportional to pressure

52. The root mean square velocity of a gas is directly proportional to

ÖT1/(ÖT)1/ÖMboth a and c

53. The no. of molecule contained in 8 gm of oxygen is

6.02×1023(1/4)×6.02×10234×6.02×102312×1023

54. The average K.E. of a molecule is directly proportional to

T2T1/2Absolute tempT+273

55. Which of the following parameter is the same for molecules of all gasses at a given temperature?

massspeedmomentumK.E.

56. In the case of adiabatic expansion :A) pressure decreases B) Internal energy decreases C) There is transfer of gas. Choose the correct one.

A is correctB is correctBoth A and B are correctNone

57. A body at 100oC in a room at 20oC drops 80oC after 5 minutes. What will be the temperature of the body after next 5 minutes?

50oC60oC65oC70oC

58. In a room containing air, heat can go from one place to another by,

conductionconvectionradiationby all the three processes.

59. A body cools down from 65oC to 60oC in 10 minutes. It will cool down from 60oC to 55oC in

10 minutes>10 minutes<10 minutesAll

60. Energy is not carried by

mechanical elastic waveslongitudinal wavestransverse wavesstationary waves

61. A motion of a particle executing SHM is given by y = 0.01 sin 100(t+0.005x), where y is in meter and t is in second. The time period of motion is:

0.01 sec0.02 sec0.1 sec0.2 sec

62. A wave of frequency 500 Hz has velocity of 350 m/s. How far apart are two points 60o out of phase?

10 cm12 cm15 cm17.5 cm

63. A sine wave is traveling in a medium. The minimum distance between the two particles, always having the same speed is

λ/4λ/3λ/2λ

64. A metal string of mass 250 gm and length 25 cm is under the tension of 400 N. The fundamental frequency of this string is

400 Hz126 Hz40 Hz800 Hz

65. What is the loudness of the sound wave whose intensity is 10-9 Watt/m2 . Given:Io=10-12 Watt/m2

10 db20 db30 db100 db

66. The velocity of sound in air is 332 m/sec. If the frequency of the fundamental mode of an open pipe is 332 Hz. What would be the length of the pipe?

100 cm50 cm10 cm5 cm

67. Sound energy is converted into electrical energy in

loud speakermicrophonesonometerradio

68. Sound wave in air is

always longitudinalalways transversemay be longitudinalmay be transverse

69. Which of the following conclusively exhibits the transverse nature of light?

reflectionrefractionpolarizationdiffraction

70. The phenomena of beats takes place for:

longitudinal wave onlytransverse wave onlyfor bothfor none

71. A plane mirror is approaching you at 10 cm/sec. At what speed, will your image approach you?

10 cm/sec5 cm/sec20 cm/sec15 cm/sec

72. If an object is 30 cm from a concave mirror of focal length 15 cm, the image will be

erectsame sizeddiminishedvirtual

73. The image of a virtual object produced by a convex mirror is

inverteddiminishedvirtualreal

74. Refractive index of glass is least for

violetindigobluered

75. A diver in the water can see sun setting when the angle of refraction is

41 degree60 degree90 degree49 degree

76. A ray of light enters a medium of higher refractive index, the velocity of light will

decreaseincreaseremains unchanged

77. A convex lens forms a real image of a point object placed on it principal axis. If the upper half of the lens is painted black

the image will be shifted downwardsthe image will be shifted upwards
the image will not be shiftedthe intensity of the image will decrease

78. The deviations produced by a prism does not depend on

angle of prismmaterial of prismthe angle of incidencesize of prism

79. If light is incident on a prism at an angle of 0o , then the angle of incidence is increased, then the angle of deviation

only increasesonly decreases
first increases then reaches a maximum value and starts decreasing
first decreases then reaches a maximum value and starts increasing

80. Eye piece of Galilean telescope consist of

Convex LensConcave LensPlano concave lenscylindrical lens

81. A person can see object at distance only nearer than 2 m. The defect is called

hypermetropiamyopiastigmatismpersbiopia

82. If a person can see between 25-200 cm, he is suffering from

myopiahypermetropiastigmatismpersbiopia

83. The instrument which is used to comparing the illuminating power is known

spectrometerphotometerpolarimetervoltameter

84. Candela is equivalent to

Lumen/m2Lumen/SteradianLumen/radianLumen/meter

85. Lux is the unit of luminance which is equivalent to

Lambert/sLumen/sLumen/wattLumen/m2

86. The unit of luminous efficiency is

Lumen/m2Lumen/JouleLumen/WattLumen/s

87. The ratio of amplitude of two waves of same frequency traveling in the same medium is 3:1. Find the intensity radio of the two waves:

1:Ö3Ö3:19:11:9

88. What happens if the monochromatic light used in Young's double slit experiment is replaced by white light?

all bright fringes become whiteall bright have colors between red and violet
only the central fringe is white, all other fringes are coloredno fringes are obsorved

89. In the formula µ = tanθ, θ stands for:

Brewster anglepolarizing anglerefracting angle Reflecting angle

90. If there would be no atmosphere on the earth then the sky would look

blueblackwhitered

91. An electrophorous is a device

to measure chargewhich provides charge by friction
to collect charge by inductionwhich provides charge by conduction

92. On penetrating uniformly charged sphere, the electric field strength, E

remains unchangedincreaseddecreasedis zero at all points

93. Two charges q1 and q2 are placed closed to each other ,if a third charge q3 is brought near it, the force now exerted by q1 on q2

increasesdecreasesremains samereduces practically to zero

94. Capacitance of parallel plate capacitor increases when

distance between plates is increasedarea of plates is increasedwhen the dielectric is removedboth b and c

95. Eight drops of water of equal radius and size are fused to make one big drop, what is the capacitance increase with respect to the small drops?

2 times8 times4 timesequal

96. Two capacitors each having capacitance C and breakdown voltage V are joined series. The capacitance and the breakdown voltage of the combinations will be

2 C and 2 VC/2 and V/22C and VC/2 and 2V

97. The capacitance of capacitors does not depend upon

the shapesizethe chargethe separation

98. Which of the following is good conductor?

graphiteplastic of sulphursilicadiamond

99. Which of the following is a Ohmic conductor?

Neon gasJunction diodediode valvecopper sulphate solutions

100. Glass is a

supercooled liquidorganic polymeramorphous solidcrystalline solid

101. As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity

increasesdecreasesremains constantmay increase or decrease

102. A coil when connected with 200 V mains dissipates 400 Watt. The resistance of the coil is ...... Ohm

101000.52

103. To minimize the waste of electric energy into heat in high tension transmission

current is minimizedAC is changed to DCcurrent is maximizedvoltage minimized

104. The current in a 60 watt, 120 V light bulb operated at 80 V is

1/4 A1/3 A1/2 A3/4 A

105. Two resistors R and 2R are connected in parallel in an electric circuit, the thermal energy developed in R and 2R in the radio

1:22:11:44:1

106. Electrolysis is possible only in

ACDCbothboth at any voltage

107. The electrochemical equivalent of a material depends on

the current passing through the electrolytethe amount of charge passed through the electrolyte
the substances being liberatedthe nature of the material

108. Earth's magnetic fields always have horizontal component except

at the equatorat the magnetic polealtitude of 60olongitude of 60o

109. The material of electromagnet should have high

permeabilitysusceptibilityretentivitycoercivity

110. A charged particle is moved along a magnetic field line. The magnetic force on the particle is

along its velocityopposite to its velocityperpendicular to its velocityzero

111. When a charged particle is projected perpendicular to the magnetic field, the area covered by the path of the particle depends on

velocitymomentumkinetic energynone

112. Which of the following particle will describe, the smallest circle one projected with the some velocity to a magnetic field?

electronprotonHe+Li++

113. If two conductors carry current in opposite direction, these will

attract each otherrepel each otherremain stationarynone of the above

114. Lenz's law corresponds to the law of conservations of

energyemfchargemomentum

115. Is magnetic flux a vector quantity?

Yes, because magnetic flux density is a vector quantityYes, it is a product of two vectors.
No, because it is a scalar product of two vectorsNo, because magnetic flux density is scalar quantity

116. Power dissipation in a pure inductor is

1/2LI2LI/2L2I2/2zero

117. An AC circuit contains capacitor and resistor. In this circuit

current leads the voltagecurrent lags behind the Vvoltage leads the currentvoltage lags behind power

118. An inductor

allows AC to pass but blocks DCpasses both AC and DCallows DC to pass but blocks ACblocks DC only

119. Total energy of atomic electron is

less than zeromore than zerozero

120. If the current in the circuit for heating filament is increased, the wavelength

will increasewill decreasewill remain unchanged

121. X-rays incident on a material

exerts a force on ittransfers energy to ittransfers momentum to ittransfers impulse to it

122. Choose the incorrect statements

X-rays are not refractedX-rays are diffractedX-rays can cause ionizationX-rays are deflected by E and B

123. Hydrogen atom does not emit X-rays because

its energy levels are too close to each otherits energy levels are too far from each other
it is too smallit has single electron

124. After 4 years 15/16th part of the radioactive substance is lost. Half life of the element is

2 years1 year6 months4 years

125. What is the average life of radioactive substance having half life 1600 years?

2309 years2954 years5632 years2435 years

126. In which of the following decays the atomic no. increases?

β+decayβ-decayα-decayγ-decay

127. The half life of radioactive substance is 20 hours. What fraction of original activity will remain after 40 hours is

1/41/161/81/32

128. If the emission of α-particle is followed by the emission of one β-particle, the mass number

is decreased by 4is increased by 2remains unchangedis changed by 3

129. Hydrogen bomb is based on

controlled fissioncontrolled fusionuncontrolled fissionuncontrolled fusion

130. The source of solar energy is due to

chemical reactionnuclear fissionnuclear fusiongravitational energy

131. Cathode rays have

only massonly chargeboth charge and massno mass and no charge

132. Let np and ne be the no. of holes and free electrons in an intrinsic semiconductor,

np>nenp<nenp=nenp≠ne

133. When the impurity is dopped into an intrinsic semiconductor, the conductivity

increasesdecreasesremains same

134. Conductivity of intrinsic semiconductor can be increased by

increasing the temperaturedoping group V elementdoping group III elementall

135. Minority carriers are

holes in N and P typefree electron in N type and holes in P type
free electron in P type and holes in N typeholes in N type and free electrons in P type

136. Transistor is a

voltage operated devicecurrent operated deviceboth voltage and current operated devicenone

137. The relationship between α and β of a transistor is

1/α+1/β=1α=β/β-1β=α/1+αβ=α/1-α

138. A junction diode is said to be forward biased when

+ve terminal is connected to P-side+ve terminal is connected to N-side
-ve terminal is connected to N-side-ve terminal is connected to P-sideboth A and C

139. A semiconductor is doped with a doner impurity

the hole concentration increasesthe electron concentration increasesthe electron concentration decreases

140. A N-P-N transistor in a common emitter mode has

a low transformer ratioa low AC current gainleakage of current is independent of temperaturevalid Kirchoff's law
 
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