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KCET Medical | 2015
Q. A proton beam enters a magnetic field of 104Wb m2 normally. If the specific charge of the proton is 1011C kg1 and its velocity is 109 ms1, then the radius of the circle described will be
  1. 0.1 m
  2. 10 m
  3. 100 m
  4. 1 m
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Q. The angle between the dipole moment and electric field at any point on the equatorial plane is :
  1. 0
  2. 90
  3. 180
  4. 45
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Q. In the circuit shown below, the ammeter and the voltmeter readings are 3 A and 6 V respectively. Then the value of the resistance R is:
571011.jpg
  1. 2Ω
  2. >2Ω
  3. <2Ω
  4. 2Ω
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Q. The ratio of angular speed of a second-hand to the hour-hand of a watch is
  1. 720:1
  2. 60:1
  3. 3600:1
  4. 72:1
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Q. 1 gram of ice is mixed with 1 gram of steam. At thermal equilibrium, the temperature of the mixture is
  1. 55C
  2. 100C
  3. 0C
  4. 50C
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Q. The velocity - time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio:
570935_31be05de575a48cf934c2a6aa8feda7a.png
  1. tan25 to tan40
  2. tan25 to tan50
  3. sin25 to sin50
  4. cos25 to cos50
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Q. In Wheatstones network P=2Ω, Q=2Ω, R=2Ω and S=3Ω. The resistance with which S is to shunted in order that the bridge may be balanced is
  1. 2Ω
  2. 1Ω
  3. 4Ω
  4. 6Ω
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Q. Three point charges 3nC, 6nC and 9nC are placed at the corners of an equilateral triangle of side 0.1 m. The potential energy of the system is :
  1. 89100 mJ
  2. 8910 nJ
  3. 99100 KJ
  4. 9910 J
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Q. The ratio of hydraulic stress to the corresponding strain is known as
  1. Compressiblity
  2. Bulk modulus
  3. Rigidity modulus
  4. Young's modulus
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Q. A spherical shell of radius 10 cm is carrying a charge q. If the electric potential at distances 5 cm, 20 cm and 15 cm from the centre of the spherical shell is V1, V2 and V3 respectively, then :
  1. V1=V2>V3
  2. V1>V2>V3
  3. V1=V2<V3
  4. V2<V3<V1
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Q. The resistance of the bulb filament is 100Ω at a temperature of 100C. If its temperature co-efficient of resistance be 0.005 per C, its resistance will become 200Ω at a temperature
  1. 300C
  2. 400C
  3. 200C
  4. 500C
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Q. A stretched string is vibrating in the second overtone, then the number of nodes and antinodes between the ends of the string are respectively:
  1. 4 and 3
  2. 3 and 4
  3. 2 and 3
  4. 3 and 2
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Q. The kinetic energy of a body of mass 4 kg and momentum 6 Ns will be
  1. 2.5 J
  2. 3.5 J
  3. 4.5 J
  4. 5.5 J
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Q. Three resistances 2Ω, 3Ω and 4Ω are connected in parallel. The ratio of currents passing through them when a potential difference is applied across its ends will be
  1. 6:3:2
  2. 5:4:3
  3. 4:3:2
  4. 6:4:3
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Q. A cyclotron is used to accelerate
  1. Neutron
  2. Both positively and negatively charged particles
  3. Only positively charged particles
  4. Only negatively charged particles
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Q. Two cells of emf E1 and E2 are joined in opposition (such that E1>E2). If r1 and r2 be the internal resistance and R be the external resistance, then the terminal potential difference is
571009_2de3da3bc872455e91440cca234fe275.png
  1. E1+E2r1+r2×R
  2. E1+E2r1+r2+R×R
  3. E1E2r1+r2×R
  4. E1E2r1+r2+R×R
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Q. A particle is projected with a velocity v so that its horizontal range twice the greater height attained. The horizontal range is
  1. v2g
  2. 2v23g
  3. 4v25g
  4. v22g
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Q. Two concentric coils each of radius equal to 2π cm are placed right angles to each other. If 3A and 4A are the currents flowing through the two coils respectively. The magnetic induction (in Wb m2) at the centre of the coils will be
  1. 12×105
  2. 105
  3. 7×105
  4. 5×105
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Q. A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on charge, potential and capacitance respectively are:
  1. constant, decreases, decreases
  2. increases, decreases, decreases
  3. constant, decreases, increases
  4. constant, increases, decreases
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Q. Two spheres carrying charges +6μC and +9μC separated by a distance d, experiences a force of repulsion F. When a charge of 3μC is given to both the sphere and kept at the same distance as before, the new force of repulsion is :
  1. F
  2. 3F
  3. F/3
  4. F/9
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Q. A stone of mass 0.5 kg is thrown vertically upwards. What is the direction and magnitude of net force on the stone during its upward motion?
  1. 4.9 N vertically upward
  2. 4.9 N vertically downward
  3. 0.98 N vertically downward
  4. 9.8 N vertically downward
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Q. Moment of Inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is I. If the same rod is bent into a ring and its moment of inertia about its diameter is I, then the ratio II is
  1. 3π2/2
  2. 8π2/3
  3. 2π2/3
  4. 5π2/3
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Q. The ratio of kinetic energy to the potential energy of a particle executing SHM at a distance equal to half its amplitude, the distance being measured from its equilibrium position is
  1. 3:1
  2. 4:1
  3. 2:1
  4. 8:1
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Q. Pick out the statement which is incorrect :
  1. The tangent drawn to a line of force represents the direction of electric field
  2. The electric field lines form closed loop
  3. A negative test charge experiences a force opposite to the direction of the field
  4. Field lines never intersect
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Q. When two tuning forks A and B are sounded together, 4 beats per second are heard. The frequency of the fork B is 384 Hz. When one of the prongs of the fork A is filed and sounded with B, then beat frequency increases, then frequency of the fork A is
  1. 380 Hz
  2. 388 Hz
  3. 379 Hz
  4. 389 Hz
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Q. The efficiency of a Carnot engine which operates between the two temperature T1=500 K and T2=300 K is
  1. 50%
  2. 25%
  3. 75%
  4. 40%
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Q. Four identical cells of emf E and internal resistance r are to be connected in series. Suppose if one of the cell is connected wrongly, the equivalent emf and effective internal resistance of the combination is
  1. 4E and 4r
  2. 4E and 2r
  3. 2E and 2r
  4. 2E and 4r
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Q. Water is heated from 0C to 10C, then its volume
  1. Decreases
  2. Increases
  3. Does not change
  4. First decreases and then increases
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Q. The ratio of the dimensions of Planck constant and that of moment of inertia has the dimensions of
  1. Time
  2. Frequency
  3. Angular momentum
  4. Velocity
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Q. If the mass of a body is M on the surface of the earth, the mass of the same body on the surface of the moon is :
  1. M
  2. M/6
  3. 6 M
  4. Zero
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