JEXPO 2013: Physics Question Part(26-50 Q)



26. The image formed by a plane mirror is always :
  • Virtual & inverted
  • real & inverted
  • Virtual and the same size
  • real and of the same size
27. The minimum distance between the source and the reflector, so that an echo is heard is approximately equal; to (velocity of sound in air 332 m/s) :
  • 33.2m
  • 16.6m
  • 8.3m
  • 4.2
28.  A constant force acts on two particles of masses 4kg and 16 kg during which both of them travel a distance of s meter. Both particles were initially at rest and they started off at the same time. The ratios of the speeds attained by them are :
  • 4:1
  • √2:1
  • 2:1
  • 5:4
29.  If the acceleration due to gravity g, is about 10 m/s2 near the surface of the earth, then at the center of the earth g would have an approximate value of :
  • Zero
  • 5m/s2
  • 10m/s2
  • 20m/s2
30.  In the case of a prism, the angle of deviation is greater for :
  • Violet
  • Red
  • Blue
  • Green
31.  Two resistances are joined in parallel whose resultant is 6/5 Ω. One of the resistance wires is broken and the effective resistance becomes 2 Ω. The resistance in ohm of the wire that got broken is :
  • 2Ω
  • 3Ω
  • 3/5Ω
  • 6/5Ω
32. The molar gas constant is the same for all gases because, at the same pressure and temperature, equal volumes of all gases have the same :
  • Mass
  • Average kinetic energy
  • Number of molecules
  • Density
33.  If the object is placed at 2f from a convex lens, then :
  • A real image is formed at 2f on the other side.
  • A real inverted image is formed at 2f on the other side.
  • A real image is formed at infinity.
  • A real inverted image is formed between f and 2f on the other side.
34.  Which one of the following instrument can be regarded as non-ohmic resistance :
  • A piece of copper wire
  • Ammeter
  • Diode valve
  • Voltmeter
35. Among the moving particles (α, β, γ particle), which one or which ones are not deflected by the magnetic field?
  • α and β-particle
  • β and γ-particle
  • α and γ-particle
  • γ-particle
36. An object is placed in front of two plane mirrors which are perpendicular to each other. The number of images that can be seen by an observer is :
  • Three
  • Two
  • Four
  • Infinity
37. 540 gm of ice at 0°C mixed with 540 gm of water at 80°C. The final temperature of the mixer is :
  • 0℃
  • 40℃
  • 80℃
  • Less than 0℃
38.  Three resistances each of 4 ohms are connected to form an equilateral triangle. The equivalent resistance between any two corners is :
  • 12 ohm
  • 8 ohm
  • 3/8 ohm
  • 8/3 ohm
39.  92U23592U238differ as :
  •  92U235 has 3protons less
  •  92U238 has 3 electrons more
  •  92U235 has 3 neutrons less
  •  92U238 has 3 protons more
40.  Two bulbs when connected in parallel to a source, take 60 W each, The total power consumed when they are connected in series with the same source is :
  • 15 W
  • 30 W
  • 60 W
  • 120 W
41. A train moving with a speed of 36 km/hr takes 14 sec to cross a bridge of length 100m. The length of the train is :
  • 140 m
  • 40 m
  • 100 m
  • 60 m
42. The rate of radioactive disintegration increases :
  • With the increase in temperature
  • With the increase in pressure
  • With the increase in the magnetic field
  • None of these.
43. In a nuclear reactor for control rod we use :
  • Carbon
  • Heavy water
  • Lithium
  • Cadmium
44. The freezing point on a thermometer is marked 30° and the boiling point is marked as 180°. The reading of the thermometer at 50°C is :
  • 60°
  • 80°
  • 105°
  • 120°
45.  The densities of two substances are the ratio 2:3 and their specific heats are in the ratio 4:3. Their thermal capacities per unit volume are in the ratio :
  • 2:3
  • 4:9
  • 8:9
  • 4:3
46. At what common temperature a wooden block and a metallic block would be felt equally cold or equally hot when touched?
  • At any temperature
  • If both the blocks are at 0°C
  • If the temperature of both the blocks equal the temperature of the person touching them
  • None of these
47. Two resistance 1 Ω and 3 Ω are connected parallel and the combination is connected to a 2-volt source. The ratio of electric current through the resistance will be :
  • 1:2
  • 3:1
  • 1:3
  • 4:1
48. Two plane mirrors are inclined to each other at an angle θ. A ray of light is reflected first in one mirror and then at the other. The total deviation of the ray is :
  • 240°-2θ
  • 360°-2θ
  • 180°-2θ
49.  The ideal gas equation for 1 mole of ideal gas is PV=RT, the SI unit of universal gas constant R is :
  • cal gm-10 C-1
  • J mol-1 K-1
  • J kg-1 K-1
  • None of these
50. At STP amoung 32 gm of SO2, 22 gm of CO2 and 17 gm of H2O gas :
  • SO2 gas has the maximum number of molecules
  • CO2 gas has the maximum volume
  • All gases have an equal number of molecules
  • None of these





Source: Oriental MCQ (2018)
Author: Abhinandan Singh

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