1. Scalar product of two parallel vectors is ……………
(ANS: Null Vector)
2. Work done on a body is equal to change in its ……………….
(position,
distance, displacement, KE)
(ANS :
K.E.)
3. Rocket propulsion utilizes the law of conservation of ………..
(ANS : Momentum )
4. Minimum initial velocity to escape earth’s gravitation is called ……
(ANS : Escape Velocity )
5. Acceleration and angular acceleration are related by the relation………
(ANS
: a = r a )
6. The terminal velocity of falling droplet is proportional to ………
(r, r2, 1/r2, 1/r)
(ANS : r )
7. In damped oscillations amplitude …………… with time.
(ANS : decreases
)
8. Speed of sound is maximum in ………..
(air, glass,
water, iron).
(ANS : iron )
9. Bending of light when passing near obstacles is called…………
(ANS : Diffraction
)
10. The phenomenon that best explains the transverse nature of light is
…………
A)reflection
B)refraction C)diffraction D)polarization
(ANS : Polarization )
11. The critical angle is such angle of incidence for which angle of
refraction is ……
(ANS : 90o )
12. The entropy of a system ………….. for a reversible process.
(ANS : Remains constant )
13. Work done on a unit charge is equal to change in its……
(ANS : Electrical
potential energy )
14. The formula for heating effect of current is……..
(ANS : H = I2Rt )
15. The unit for emf is …….
(ANS : Volt
)
16. Weber is the unit for ……….
(ANS
: magnetic flux )
17. Formula of magnetic flux density is ……….
(ANS : Wb/m2 )
18. In a capacitor circuit the voltage ……………. the applied current.
(ANS : lags by 90o )
19. The semiconductor substance containing holes are called ….........
(ANS : p-type
semiconductors )
20. The ratio β or current gain of transistor is …………..
(ANS : Ic/Ib
)
21. To accurate locate a microscopic particle one must use light wave of
………….
(ANS : Small wavelength
)
22. Velocity of an electron in an orbit is …………… to its principal quantum
number.
(ANS : inversely proportional )
23. Electrons emit photons when they jump from ………
(ANS : Higher orbit to lower orbit )
24. If a body is moving in a circular motion with constant speed then the
it has got the constant ………….
(ANS : constant magnitude only )
25. Magnetic flux is maximum when conductor is placed at an angle of ……………
to magnetic field.
(ANS : 90o
)
26. Power dissipated in a pure inductor circuit is ……….
(ANS : Zero )
27. Which one is not the unit of mass ……………..
A)gram B)kg
C)dyne D)slug.
(ANS : dynes)
28. Age of Earth is :-
A) 1.4x1017Sec B)1.4x1027Sec C)1.4x107Sec D)5x1017Sec
29. The magnitude of resultant of two vectors of magnitude 3 & 4 units
is 5 units. What is the angle b/w two vectors.
A)π/4 B)3π/4 C)π/2 D)π
30. A body starting from origin first of all moves 10m towards North
then 15m towards east and finally 20m vertically upwards. What is
its total displacement ?
A)30m B)26.92m C)18.02m D)25m
31.The acceleration produces varies directly with ;
A)Mass B) Torque C) Applied Foce D) Friction
32. When the velocity of body is doubled :
A) K.E. is doubled. B) P.E. is doubled. C) Momentum is doubled. D) Acceleration is doubled.
33. 1 KG mass has K.E. of 1 Joule when it speed is
:
A)1m/Sec B) 1.4m/Sec C)4.4m/Sec D) 2.5m/Sec
34. If Theta = 180° , then
work done is;
A) 0 B)
Maximum C) Negative D) - 1
35. Solar Cells are thin wafers made from :
A) Boron B) Silicon C) Germanium D) Cadmium
36. The dimension of angular
velocity is :
A) LT - 1 B) LT - 2 C) T - 1 D)T - 2
37. Ball pen functions on the principle of :
A) Viscosity B) Boyle's Law C) Gravitational
Force D) Surface Tension
38. If the temp. rises, the coefficient of viscosity of a liquid ?
A) Decreases B) Increases C) Remains Same D) Increase for some liquids
and decrease for others
39. The displacement of a particle executing SHM is half of its
magnitude. The fraction of its
K.E. will be :
A)2/3 B) 3/4 C) 1/3 D) 1/4
40. Which of the following has the longest wavelength :
A) Blue Light B)
Gamma Rays C) X-rays D) Red Light
41. Diffraction effect is :
A) More for round edge B) Less for round edge C) More for sharp edge D) Less for sharp edge
42. Wavelength of X-rays falling at glance angle 30° on a crystal
with atomic spacing 2x10-9 m for the 1st
order diffraction is :
A) 4x10-6m B) 2x10-10m C) 0.2x10-10m D) 20x10-10m
43. In photoelectric effect, the energy of ejected electrons depend
upon;
A) The frequency B)The intensity C)Both D) None of these
44. The normal distance for human eye is :
A) 30cm B)40cm
C)25cm D)20cm
45. The process in which pressure remains constant is called :
A)
Isothermal B)Adiabatic C)Isobaric D)Isochoric
46. How many processes does a four stroke engine undergoes ?
A)2
B)3 C) 4 D)5
47. Speed of sound in vacuum is ...........m/sec;
A)332 B)340
C)0 D) 350
48. When effective value of current is 10. What is its peak value ?
A) 12
B)13 C)10 D)14.2
49. A body moves with uniform acceleration with a distance x for 1st
Sec.
What is relation b/w x & y ?
A)y=24x B)y=16x C)y=12x D)y=8x
50. An electron volt is equal to;
A)0.62x1013J
B)1.6x10-13J
C)0.62x1019J
D)1.6x10-19J
51. A wire 3.0m long, of uniform cross-section area 2.0m2
has a conductance of 1.25ohm - 1,
what is resistivity of the
material of the wire:
A)5.3x10-7Ω-m B)8.3x10-7Ω-m C)2.15Ω-m D)1.9x10-7Ω-m
52. A small parallel resistance(shunt) used to convert a galvanometer into
an ammeter of suitable range is given by :
53. The permeability of free space is in wb/Am :
A)4πx10-7 B)2πx10-3 C)1/4πx10-7 D)None
54. An inductor of 1 henry is connected across a 220V, 50Hz
supply. The peak value of current is ;
A)0.5A B)0.7A C)1A D)1.4A
55. The transistor is basically a :
A)volt amplifier B)rectifier C)current
amplifier D)none of these
56. Hydrogen is also called :
A)Deuterium
B)Tritium C)Protium D)All
57. Rate of decay of radio active element ........ with time :
A)Increase B)Decrease C)Remains same D)All
58. Mega watt day is the unit of;
A)Power B)Energy C)Force D)speed
59. KWH is the unit of :
A)Energy B)Power C)Force D)EMF
60. Two bodies A and B have velocity ratio 1 : 2. The
ratio of the K.E. is :
A)4 : 1 B)1 :
4 C)2 : 1 D)1 : 2
61. If a body moving with a constant acceleration covers Xm in 1st
second and Ym in next four seconds thenwhat will be the relation b/w X
and Y ?
A)X=Y B)X=2Y C)Y=4X D)Y=3X
62. Which of the following friction is self adjusting force ?
A)Static
B)Limiting C)Dynamic D)Sliding
63. A man holding 7N weight moves 7m horizontally and 5m
vertical. Find the work done by the man
A)270 J B)720 J C)300 J D)120 J
64. A ring, a disc, and a sphere have masses and radius, whose moment of
inertia will be maximum ?
A)A
ring B)A disc C)A sphere D)All have same inertia
65. The max. value of drag force on an object is 9.8N. What will be
the value of its mass ?
A)9.8KG B)4KG C)2KG D)1KG
66. A body absorbs heat at constant temp. then what will be phenomena
?
A)melting point B)boiling
point C)evaporation D)both A & B
67. If 10C charge is passing through a conductor of resistance 20Ω
in 2 Sec.
Then find the potential difference across the conductors
:
A)400V B)200V C)100V D)10V
68. If "r" is the perpendicular distance of point from a
current carrying wire of infinite length
then the relation b/w "B"
and "r" :
A)r B)r 2 C)1/r D)1/r 2
69. Average value of AC over a cucle is
:
A)Io B)Io/√2 C)Io/2 D)Zero
70. In which type current flows due to the breakage of covalent bond ?
A)Donor
B)Acceptor
C)Extrinsic
D)Intrinsic
71. Silicon is :
A)Monovalent B)Divalent C)Trivalent D)Tetravalent
72. Analogous of force in rotational motion is :
A)Torque B)Angular
momentum C)Rotational
K.E. D)Angular Velocity
73. If the torque remains constant then........ should remain constant
:
A)Linear constant B)Angular
momentum C)Momentum D)Charge
74. Rocket propulsion is according to law of conservation of :
A)Energy B)Mass C)Momentum D)Charge
75. Speed of sound in vacuum is .......m/s ;
A)332 B)340 C)0 D)350
76. Choke is used to;
A)Increase
current B)Decrease voltage C)Limit current D)None
77. If a conducting wire of length 3cm move with velocity of 2m/sec
in a magnetic field of
strength 10T the inducede emf will be;
A)6V B)0.6V C)0.3V D)0.2V
78. if the no. of turns of an inductor is increased two times then its
inductance will be ; A)Doubled B)Four C)Half D)1/four
79. If the intensity of the radiation is doubled then the photo emission
will be ;
A)Doubled B)Four times C)Half D)Eight times
80. 235U92 the ratio of neutrons to necleons
is;
A)143/92 B)143/235 C)92/235 D)253/143
81. A 2mA ammeter has an internal resistance of 20Ω and it is
converted into a voltmeter of 10V.
What will be the value of resistance ?
A)200Ω in Series B)200Ω in parallel C) 0.2Ω in series D)0.2Ω in parallel
82. The time period of pendulum at the centre of earth;
A)Zero
B)Max. C)Infinite D)Min.
83. The wavelength of wave is 5000Ao. This wave will be
in region.......
A)U.V. B)Radio
C)Visible D)I.R.
84. LDR is a sensor for ;
A)Light B)Heat C)Energy D)All
85. The diameter of the atom is of the order of;
A)1010m B)10-10m C)1014m D)10 - 14m
86. An electron in an atom will absorb energy only when ;
A)It jumps from outer to inner orbital B)It jumps from inner to
outer orbital
C)Both D)None
87. The ratio of tensile stress to tensil strain is called ;
A)Force B)Young's
modulus C)Bulk Modulus D)Shear modulus
88. The proton is made up of ;
A)1
up quark and 2 down quark B)1 up
quark and 1 down quark
C)2 up
quark and 1 down quark D) 2 up
quark and 2 down quarks
89. one light year is equal to ;
A)1.62x10 - 14
B)9.15x1015
C)1.62x1014 D)None of these
90. If the radius of the earth shrinks 50% then the duration of its
day becomes ;
A)24hr B)12hr C)6hr D)48hr
91. If Rg = 95Ω with Rs
= 5Ω in an ammeter. What percentage of current will flow through Rs
?
92. In a uniform magnetic field the particle travelling perpendicular to it
will move in ;
A)Circle B)Parabola C)Straight D)Helix
93. A charge of 10C is passing through a wire in 2 Sec and
resistance of wire is 20Ω. Find V ?
94. The average A.C. in a cycle is ?
:
A)Irms B)Irms/√2 C)Io/√2 D)Zero
95. Shock absorber is an example of
:
A)Pascal law B)SHM
C)Force D)Damped oscillations
96. Which statement is contingency of 1st law
of thermodynamics ?
97. In which type of semi conductor the current flows due to breakage of
covalent bonds ?
98. If resistivity of substance will be 104. What
conductor will be called ?
A)Semi conductor
B)Super conductor
C)Conductor D)Insulator
99. The electromagnetic waves of 100KHz fell on a T.V. antenna. Then
what frequency
will induce to antenna ;
A)50KHz B)25KHz C)100KHz D)200Khz
100. A retarding force acts on a body. What work will be on the body ?
A)Positive B)Negative C)Zero D)All of above.
ECAT Math | ECAT Physics | ECAT Chemistry | Answers | Technology
Try to solve Yourself. Write your questions in comment section. Thanks.
){kind=link}
0 Comments