3. Strength of magnetic field of solenoid can be increased by adding core made of
Correct : B. ferrous
4. In Fleming's left hand rule, thumb shows direction of
Correct : C. motion
5. If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is
Correct : D. twice the Earth's magnetic flux density
6. LED starts to conduct when voltage is about
Correct : D. 2 V
7. For non-inverting amplifier the input and output is
Correct : B. in phase
8. A sensing device is also called
Correct : D. transducer
9. Op-amp can provide maximum output current of
Correct : A. 25 mA
10. Output resistance of an actual op-amp is
Correct : D. 75Ω
11. Impedance of ideal op-amp is
Correct : C. infinite
12. Change in length and cross-sectional area of metal wire changes
Correct : C. resistance
13. Amplifier produces output with more
Correct : D. power and voltage
14. Number of power supplies required to get output of op-amp is
Correct : A. two
15. A device used to avoid the relay destroying the op-amp is
Correct : C. reverse bias diode
16. As long as op-amp is not saturated, the potential difference between inverting and non-inverting inputs is
Correct : A. zero
17. A light dependent resistor is made up of
Correct : C. high resistance semiconductor
18. In inverting amplifier, the phase difference between input and output voltages must be
Correct : D. 180°
19. An infinite slew rate refers to
Correct : A. no time delay
20. To limit current in LED, resistor should be connected in
Correct : B. series
21. A component whose property changes when there is a change in any physical quantity of a device is
Correct : B. sensor
22. Benefits of negative feedback include
Correct : D. all of above
23. When temperature rises, resistance of negative temperature coefficient thermistor
Correct : B. decreases
24. If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is
Correct : A. 500Ω
25. Graph of resistance of thermistor to temperature is
Correct : A. exponential decrease
26. Output current from an LED is
Correct : A. 20 mA
27. In an inverting amplifier the non-inverting input (+) is connected to
Correct : B. 0 V line
28. Actual op-amp may have an open loop gain of{{}}
Correct : B. 105
29. Coil of relay is connected to the
Correct : B. output of op-amp
30. Pair of forces that cause steering wheel of a car to rotate is called
Correct : A. couple
31. If the principle of moments for any object holds, then object is in state of
Correct : B. equilibrium
32. Combined effect of several forces is known as
Correct : B. resultant force
33. To form a couple, the force should be
Correct : D. all of above
34. Moment of force depends upon
Correct : C. both A and B
35. Two perpendicular components are
Correct : A. independent of each other
36. Object is in equilibrium if resultant force acting on it is
Correct : C. zero
37. Center of gravity of an irregular body lies on the
Correct : C. point of intersection of lines
38. Number of forces a falling tennis ball experiences is
Correct : C. 2
39. Point where all weight of object acts is called
Correct : B. center of gravity
40. If weight of a falling tennis ball is 1.0 N and drag force acting on it is 0.2 N then resultant force is
Correct : A. 0.8 N
41. If the resultant vector forms an angle of 45°, then the two components are
Correct : B. perpendicular to each other
42. Force acting on two point masses is directly proportional to
Correct : D. product of masses
43. Mass of Earth when it's radius is 6400 km and gravitational field strength is 9.81 N kg -1 is {{}}
Correct : A. 6.0 × 1024 kg
44. On scale of building, gravitational field is
Correct : C. uniform
45. Decrease in field strength on top of Mount Everest is
Correct : D. 0.3%
46. Work done on an object to bring it to certain point in space is called
Correct : A. gravitational potential energy
47. N kg-1is equivalent to{{}}
Correct : A. m s-2
48. Mass of satellite orbiting Earth is
Correct : B. irrelevant
49. Spacing between field lines indicates
Correct : B. strength of field lines
50. Square of orbital period is proportional to
Correct : C. cube of radius
51. Number of satellites in geostationary orbits are
Correct : C. 300
52. Geostationary satellites have lifetime of nearly
Correct : B. 10 years
53. Time taken to complete a revolution around a planet is called
Correct : A. orbital period
54. As distance increases, value of gravitational field strength
Correct : B. decreases
55. All objects are attracted towards
Correct : A. center of Earth
56. Satellite around Earth follows a circular path because
Correct : C. gravitational force is perpendicular to velocity
57. Each 1 kg mass experiences force of
Correct : B. 9.81 N
58. Gravitational potential is always
Correct : D. negative
59. The closer satellite is to Earth, its speed should be
Correct : A. more fast
60. Normal force exerted per unit area by gas on walls of container is
Correct : C. pressure
61. Surface area of a typical person is about
Correct : B. 2 m2
62. If we double the temperature of an ideal gas, then it's average kinetic
energy will be
Correct : D. doubled
63. Escape velocity for a particle is about{{}}
Correct : C. 11 km s-1
64. Force exerted on a person by atmosphere is
Correct : A. 200 000 N
65. 10 mole of carbon contains
Correct : A. 6.02 × 10 24 atoms
66. Space occupied by gas is
Correct : B. volume
67. At absolute zero, volume of gas is equal to
Correct : A. 0 m3
68. Number of moles in 1.6 kg of oxygen is
Correct : B. 50 mol
69. Quantity R/NA defines
Correct : B. Boltzmann constant
70. Molar gas constant has value {{}}
Correct : C. 8.31 J mol -1 K-1
71. If average kinetic energy of molecules is higher, then temperature of
gas is
Correct : A. high
72. The ideal gas equation is
Correct : D. PV = nRT
73. Graph of p against 1⁄V is
Correct : B. straight line
74. Gases deviate from gas laws at
Correct : C. high pressure and low temperature
75. Law which relates pressure and volume of gas is
Correct : C. Boyle's law
76. As compared to the volume occupied by gas, the volume of particles is
Correct : C. negligible
77. Pressure of gas depends on the
Correct : C. both A and B
78. At standard pressure and temperature the average speed of molecules is
Correct : A. 400 m s -1
79. Speed of sound in water is 1500 m s -1, depth of water when reflected sound waves are detected after 0.40 s is {{}}
Correct : C. 600 m
80. If a snail crawls 12 cm in 60 s then it's average speed in mm s -1 is {{}}
Correct : A. 2 mm s -1
81. Speed of a body in particular direction can be called
Correct : C. velocity
82. If distance is increasing uniformly with time, then velocity is
Correct : C. constant
83. If the slope of a graph is zero and so the displacement, then velocity is
Correct : D. zero
84. Speed of snail as compared to speed of a car will be in units {{}}
Correct : A. cm s-1
85. {{}} If a river flows from west to east with constant velocity of 1.0 m s -1 and a boat leaves south bank heading towards north with velocity of 2.40 m s -1 , then resultant velocity of boat is
Correct : A. 2.6 m s-1
86. Two sides of a rectangular table are 0.8 m and 1.2 m, the displacement of spider when it runs a distance of 2.0 m is
Correct : B. 1.4 m
87. Distance travelled by a body in time ‘t’ is
Correct : B. average velocity
88. Displacement is a
Correct : B. vector quantity
89. A car is travelling at 15 m s-1, the distance it will travel in 1 hour is {{}}
Correct : A. 54 km
90. A car travelled south-west for 200 miles depicts
Correct : D. displacement
91. Sum of e.m.f around any loop equals
Correct : B. sum of potential difference
92. Current entering and leaving a point in a circuit should be
Correct : A. equal
93. Current through each resistor when they are connected in series is
Correct : B. same
94. If a billion electrons enter a point in 1 s, then number of electrons leaving that point in 1 s are
Correct : C. 1 billion
95. Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their
combined resistance is given by
Correct : D. 10 Ω
96. Kirchhoff's 2nd law deals with
Correct : D. both B and C
97. Combined resistance of 5 Ω and 10 Ω is equal to
Correct : C. 15 Ω
98. Two 10 Ω resistors are connected in parallel, their equivalent resistance
is
Correct : A. 5 Ω
99. Kirchhoff's 2nd law is consequence of law of conservation of