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
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