Class 11,12 and IOE MCQ question
Solve this if you can
1. A galvanometer with internal resistance 5Ω can sustain a
maximum current 25mA.The shunt required for maximum
current 10A is
A. 12.5Ω
B. 0.12Ω
C. 0.012Ω
D. 1.2Ω
2. When an elastic material with Young's modulus Y is
subjected to stretching stress S,the elastic energy stored per unit
volume of material is
A. YS/2
B. (S^2)/(2Y)
C. (S^2)/(Y/2)
D. S/(2Y).
3. At what height from earth, g becomes g/2 ?
A. R/2
B. 0.414 R
C. 0.7 R
D. R
4. Ball A attached to one end of rigid weightless rod , while an
identical ball B is attached to the center of the road. Each ball
has a mass 0.5 kg and the length of each half of the rod is 0.4 m.
This arrangement is held by an empty end is whirled around in a
horizontal circle at a constant rate , so each ball is in uniform
circular motion . Ball A travels at a constant speed of 4 m/s. The
tension on the left of the rod is :
A. 20 N
B. 15 N
C. 10 N
D. 5 N
5. If m and r are respectively the mass of electron and radius of
the orbit in which the electron revolves about the nucleus.The
moment of inertia of electron will be
A. mr2
B. (1/2)∗mr2
C. (2/5)∗mr2
D. (2/3)∗mr2
6. A projectile thrown with a speed v at an angle θ has a range
R on the surface of earth. For same v and θ, its range on the
surface of moon will be .. ?
A. R/6
B. 6R
C. R/36
D. 36R
7. If the absolute temperature of a radiating body is suddenly
halved, the radiating power will reduce approximately by
A. 25%
B. 12.5%
C. 6.25%
D. 3.12%
8.. 175 calories of heat are required to raise the temperature of
5mole of an ideal gas at constant pressure from 20o C to
25oC.The amount of heat required to raise the temperature of
same gas from 20oC to 25oC constant volume will be
A. 100cal
B. 125cal
C. 150cal
D. 175cal
9. When a 20V battery is connected across an unknown resistor
there is a current of 50 mA in the circuit. Find the value of the
resistance of the resister:
A. 2500 Ω
B. 400 Ω
C. 0.4 Ω
D. none of these
10. Which of the following statement is not true, regarding the
electrical set-up for the verification of Ohm’s law:
A. The voltmeter is connected in parallel with the known
resistance
B. The ammeter is connected in series circuit
C. The rheostat can only increase the resistance in electric
circuit
D. The single key is used to switch on/off the electric circuit
11. Flux invloved in the emf equation of a transformer has
A. RMS value
B. average value
C. Total value
D. maximum value
12. In parallel combination the resistance decreases due to
increase in
A. area of cross section
B. length
C. both a and b
D. none of the above
13. which of the following is renewable energy?
A. petroleum
B. bioethanol
C. nuclear
D. none
14. The compression ratio for petrol engine varies from
A. 25 - 40
B. 10 - 15
C. 6 - 10
D. 15 - 25
15. The power available at the shaft of an IC engine is known as
A. Brake horse power
B. Indicated horse power
C. Frictional horse power
D. none of above
16. In vertically placed traffic light signals the order of signal
from top to down is
A. red-green-amber
B. green-amber-red
C. red-amber-green
D. amber-green-red
17. A diffraction pattern is obtained using a beam of red light,
What happen if the red light is replaced by blue light?
A. no change
B. diffraction bands become broader and recorded
C. bands become broader and further apart
D. bands may disappear
18. The fly wheel used in two stroke engine as compound to
four stroke engine is
A. heavy in weight
B. same in weight
C. light in weight
D. none
19. When an external resistance R is connected to a cell of
internal resistance r, the maximum current flows in the external
resistance when
A. R<r
B. R>r
C. R = r
D. any value of R
20. Among which of the following resistance does not
depend..........
A. length of conductor
B. area of cross-section
C. temperature
D. density
21. The objective of terrestrial telescope has a focal length of 50
cm and its magnifying power is 10 when adjusted for parallel
rays. If the erecting lens has a focal length 15 cm, the total
length of such a telescope is
A. 65 cm
B. 75 cm
C. 95 cm
D. 115 cm
22. A ray of light is incident at angle of incidence ‘i’ on one
surface of a prism of small refracting angle ‘A’ and emerges
normally from the opposite surface. If the R.I. of the material of
the prism is μ; the angle of incidence ‘i’ is equal to
A. A/μ
B. A/(2μ)
C. μA
D. μ(A/2)
23. One Faraday is equal to
A. 69500 coulombs
B. 96.5 coulombs
C. 96500 coulombs
D. none
24. A body of moment of inertia of 3kg(m^2) rotating with an
angular speed of 2 rad/sec has the same kinetic energy as a mass
of 12kg moving with speed of
A. 2 m/s
B. 1 m/s
C. 4 m/s
D. 8 m/s
25. Some quantity of tap water is placed in an open pan and
allowed to evaporate. After some time the temperature of water.
A. decreases slightly
B. increases slightly
C. remain same
D. increases considerably
26. A sample of an ideal gas occupies a volume of ‘V’ at a
pressure ‘P’ and absolute temp T. The mass of each molecule is
m, then density of gas is
A. mKT
B. p/KT
C. p/KTV
D. pm/KT
27. Superconductors exhibit
A. Paramagnetism
B. Diamagnetism
C. Ferromagnetism
D. Ferrimagnetism.
28. A disc of radius 10 cm is rotating in magnetic field of flux
density 0.4 T acting along axis. Emf of 0.08 V is developed
between rims & centre of disc, then the angular frequency of
disc is
A. 20 /sec
B. 40 /sec
C. 60 /sec
D. 80 /sec
29. Voltmeter measures
A. rate of flow of charge per sec
B. amount of energy consumed in the corresponding load
C. amount of voltage drop across the load
D. amount of power dissipated in the corresponding load
30. The vertical part of transformer is called
A. yoke
B. limb
C. insulating paper
D. turn of coil
31. In parallel combination, total electrical power
A. increases
B. decreases
C. remains same despite of adding resistance
D. may both increase or decrease
32. A battery of 12V is connected in series with resisters of 0.2
ohm , 0.3 ohm,0.4 ohm,0.5 ohm and 12 ohm. How much current
would flow through the 0.3 ohm resister :
A. 0.895 A
B. 1.11 A
C. 0.5 A
D. none of these
33. A transformer rated upto 200 KVA is
A. Power Transformer
B. Distribution Transformer
C. Isolation Transformer
D. none
33. A sphere of radius R is charged with charge Q. A small test
charge qo is place at a distance x from the surface of sphere. The
force experienced by the test charge is proportional to
A. 1/(R+x)^2
B. (R + x)^2
C. (R−x)^2
D. 1/(R−x)^2
34. How will be the image formed by a convex lens if the upper
half of the lens is wrapped in black paper
A. No effect
B. Brightness of image will be reduced
C. Upper half of the image will be absent
D. Size of the image is reduced to half
35. An astronomical telescope has a magnifying power 10.The
focal length of eye piece is 20 cm.The focal length of the
objective is
A. 2cm
B. 200cm
C. 1/200cm
D. 0.5cm
36. The kinetic energy of electrons released in photoelectric
emission is dependent upon
A. frequency of incident light
B. Intensity of incident light
C. Nature of cathode surface
D. Work function
37. The phenomenon of acquiring temporary electrification
under the influence of a charged body is called
A. magnetic induction
B. electrical induction
C. capacitance
D. electrolysis
38. A carnot engine takes in 300 kcal of heat from a reservoir at
627oC and gives it to a sink at 27oC . The work done by the
engine is
A. 4.2∗(10^6)J
B. 8.4∗(10^6)J
C. 16.8∗(10^6)J
D. 0
39. A whistle giving out 450 Hz approaches a stationary
observer at a speed of 33 m/s. The frequency heard by the
observer in Hz is
A. 409
B. 517
C. 429
D. 500
40. Consider two simple pendulums, A and B having identical
bobs and same time period of oscillation T1. If the bob of A is
half filled with mercury and that of B is half filled with water,
then
A. Pendulum A will have longer time period of oscillation than
that of B
B. Pendulum B will have longer time period of oscillation than
that of A.
C. Pendulum A and Pendulum B will have the same time period
of Oscillation T1.
D. none of the above.
41. A a.c. voltage E = 200√2 sin 400t V is connected across a
circuit containing a capacitior of 1μF. What is the current flow is
the circuit ?
A. 10 mA
B. 20 mA
C. 40 mA
D. 80 mA
42. A circle has resistance 20Ω. Its arc subtends 30 degree angle
at its centre. what will be equivalent resistance across arc
A. 36/55 Ω
B. 36/46 Ω
C. 55/36 Ω
D. 46/36 Ω
43. The power of a water pump is 3 kilowatt.The volume of
water it can raise in one minute to a height of 10m ,[assuming
that g = 10m/(s^2)] is ?
A. 2 m^3
B. 2.4 m^3
C. 4 m^3
D. 1.8 m^3
44. In order to light a 6W -6V bulb at rated power a battery of
emf 6V and internal resistance 2Ω is used. The bulb will light at
power:
A. 6W
B. 27/8W
C. 4W
D. 16/3W
45. There are 64 oil drops each with 1V. If all of them
coalesces into 1 big drop. What will be its total voltage?
A. 16 v
B. 12 v
C. 24 v
D. 32 v
46. The distance between an object and a diverging lens is 'p'
times the focal length of the lens. The lateral magnification 'm'
produced by the lens will be:
A. p
B. p^(−1)
C. 1 + p
D. (1+p)^(−1)
47. Two parallel square plates of length 10 com and moving
with velocity 10 cm/sec pass in liquid of viscosity of 0.01 poise.
If the force between the plates in liquid is 200 dyne then the
separation between the plates is
A. 5 cm
B. 0.5 cm
C. 0.05 cm
D. 0.005 cm.
48. The maximum efficiency of an engine operating between
30oC and 300oC is
A. 4.71%
B. 47.1%
C. 90%
D. 9%
49. A piece of ice is floating in a beaker containing
water.When the ice melts,then level of water ?
A. Rises
B. Falls
C. Remains Same
D. First increases then decreases
50. If the absolute temperature of a body is increased by 100%
the energy emitted by the body would become
A. double
B. four times
C. eight times
D. sixteen times
51. Which of the following rays gets deflected by electric
field?
A. X-ray
B. α-Ray
C. γ- ray
D. UV rays
52. Which of these statement is true?
A. AC is more dangerous than DC
B. DC is more dangerous than AC
C. Both AC and DC are equally dangerous
D. Neither AC or DC are Dangerous.
53. A sphere whose mass is 2 kg is suspended by means of
string. The other end of the string is attached to the vertical wall
of a lift moving up with an acceleration of 2 m/(s^2). What
horizontal force is required to deflect the sphere to an
equilibrium position when the string makes an angle of
45 degree with the wall?
A. 24 N
B. 20 N
C. 19 N
D. 15 N
54. A mass of gas at pressure 50 cm of Hg is heated from 27oC
to 97oC .. If the volume is maintained constant , the pressure
exerted by the gas will be ....... cm of Hg
A. 50 B. 40 C. 61.67 D. 71.2
55. The collector current in a bipolar junction transistor is 2
mA when the base current is 0.1 mA. Then the emitter current is
A. 1.9 mA
B. 2.1 mA
C. 20 mA
D. none of above
56. A car is moving towards a cliff with velocity 2m/s. If the
frequency of horn blow by car is 500 Hz. The no. of beats
formed for observer is (velocity of sound is 330 m/s).
A. 4
B. 6
C. 8
D. 10
B
57. Two satellites A and B, ratio of masses 3:1 are in circular
orbits of radius r and 4r. Then ratio of total mechanical energy
of A and B is :
A. 1:3
B. 3:1
C. 3:4
D. 12:1
58. The dimension of Universal Gravitational Constant is
A. [M L T^(−2)]
B. [M^(−1) L^3 T^(−2)]
C. [M^(−1) L^2 T^(−2)]
D. [M^0 L^(−1) T^(−2)]
