COMEDK Engineering | 2012
Q. A black body at a temperature T radiates energy at the rate of E Wm2. If the temperature is decreased by (T/2) the energy radiated will be:
1. E/4
2. E/16
3. E/32
4. E/8
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Q. The direction of the force on a current carrying conductor held perpendicular to an uniform magnetic field is given by:
1. Fleming's right hand rule
2. Ampere's swimming rule
3. Fleming's left hand rule
4. Maxwell's right hand cork screw rule
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Q. If x=at+bt2 where x is measured in m and t in s, then the dimension of (b/a) is:
1. [T1]
2. [T]
3. [LT1]
4. [LT2]
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Q. The ratio of speed of sound in Hydrogen to that in Oxygen at the same temperature is:
1. 1:4
2. 1:1
3. 4:1
4. 16:1
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Q. When two light nuclei fuse to form a relatively heavier nucleus, the specific binding energy of the product nucleus is:
1. greater than that of the reacting nuclei
2. lower than that of the reacting nuclei
3. equal to that of the reacting nuclei
4. equal to exactly half of either of the reacting nuclei
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Q. The output of NOT gate when its input is 0:
1. is 1
2. is 0
3. can be 0 or 1
4. is 0 and 1
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Q. A ring rolls down an inclined plane. The ratio of the rotational kinetic energy to translational kinetic energy is:
1. 1:3
2. 1:1
3. 3:1
4. 2:1
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Q. The correct relation between S, θ, L and C for an optically active solution is:
1. S=θLC
2. θ=SLC
3. L=θSC
4. C=θLS
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Q. A particle is moving eastward with a velocity 5 ms1. In 10s the velocity changes to 5 ms1 northwards. The average acceleration in this time is:
1. 12 ms2 towards North - West
2. 12 ms2 towards North - West
3. 12 ms2 towards North - East
4. 12 ms2 towards North - East
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Q. The work done in taking an ideal gas through one cycle of operation as shown in the indicator diagram:

1. 105J
2. 103J
3. 102J
4. 10 J
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Q. An inductor and a resistor are connected to an ac supply of 50V and 50Hz. If the voltage across the resistor is 40V the voltage across the inductor will be:
1. 10 V
2. 20 V
3. 30 V
4. 60 V
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Q. Two point charges Q1=2μC and Q2=1μC are placed as shown. The coordinates of the point P are (2cm, 1cm). The electric intensity vector at P subtends an angle θ with the positive X axis. The value of θ is given by:

1. tanθ=2
2. tanθ=3
3. tanθ=4
4. tanθ=1
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Q. LCD stands for:
1. Liquid Crystal Display
2. Long Crystal Display
3. Light Carrying Diode
4. Light Crystal Display
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Q. Assuming g(moon)=(16)gearth and D(moon)=(14)Dearth where g and D are the acceleration due to gravity and diameter respectively, the escape velocity from the moon is:
1. 11.224 kms1
2. 11.2×24 kms1
3. 11.224 kms1
4. 11.2×24 kms1
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Q. A convex lens of focal length F is placed in contact with a concave lens of focal length F. The equivalent focal length of the combination is:
1. Infinity
2. F/2
3. 2F
4. Zero
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Q. Which of the following cannot be explained on the basis of Bernoulli's principle?
1. Lift on an aircraft's wing
2. Ink filler
3. Swing of a cricket ball
4. Atomizer
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Q. A mass of 0.1 kg is hung at the 20 cm mark from a 1 m rod weighing 0.25 kg pivoted at its centre. The rod will not topple if:
1. no other mass is attached to the rod
2. 0.15 kg is hung at 80 cm mark
3. 0.15 kg is hung at 70 cm mark
4. 0.10 kg is hung at 70 cm mark
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Q. A radioactive sample has a half-life of 10 minutes. If 64 nuclei are contained in the sample the number of nuclei that would decay after 50 minutes is:
1. 62
2. 2
3. 5
4. 59
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Q. A particle executes simple harmonic motion with amplitude A. The distance moved by the particle in one oscillation is:
1. A
2. 2A
3. Zero
4. 4A
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Q. The layer in the earth's atmosphere which reflects radio waves from the earth thus, helping radio communication is:
1. Mesosphere
2. Ionosphere
3. Troposphere
4. Stratosphere
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Q. The carrier of electromagnetic interaction is:
1. gluon
2. photon
3. meson
4. graviton
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Q. The reaction of the floor on an object placed on the floor of an elevator is maximum when elevator:
1. cable snaps and it falls freely towards the earth
2. accelerates downwards
3. accelerates upwards
4. is stationary
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Q. A block of mass 0.1kg is held against a wall by applying a horizontal force on 5N on it. If μs between the wall and the block is 0.5 the magnitude of the frictional force acting on the block is :
1. 4.9N
2. 2.5N
3. 0.98N
4. 0.49N
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Q. Which of the following statement is false:
1. Sound and light wave exhibit interference
2. Sound and light wave exhibit diffraction
3. Light wave exhibits polarization while sound wave does not
4. Sound wave exhibits polarization while light wave does not
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Q. If 120J of work is done in 2 minutes by a water pump, the power of the pump is:
1. 60 W
2. 14.4 KW
3. 1 W
4. 240 W
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Q. A capacitor of 10 μF is connected to a 10 V cell. The maximum charge on the capacitor will be:
1. 1 μC
2. 1000 μC
3. 10 μC
4. 100 μC
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Q. Reverse saturation current of a diode:
1. is independent of temperature
2. increases with increase in temperature
3. decreases with increase in temperature
4. may increase or decrease with increase in temperature depending on the semiconductor
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Q. A 10 μF capacitor is charged to 10 V and disconnected from the battery. If another uncharged 10 μF capacitor is connected across it in parallel the voltage across the combination will be:
1. 20 V
2. 5 V
3. 10 V
4. 0
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Q. A particle is projected at an angle of 300 with the horizontal with a momentum P. At the highest point its momentum is
1. 32P
2. 23P
3. P
4. 12P
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Q. The number of neutrons in 92U235 nucleus is:
1. 235
2. 92
3. 143
4. 327
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