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2011 46 questions

Q612011 · 21 Aug 2011
Which one among the following waves are called waves of heat energy ?
1. A.Radio waves
2. B.Infrared waves
3. C.Ultraviolet waves
4. D.Microwaves
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Answer: B
Q622011 · 21 Aug 2011
Ultrasonic waves are those sound waves having frequency
1. A.between 20 hertz and 1000 hertz
2. B.between 1000 hertz and 20000 hertz
3. C.more than 20 kilohertz
4. D.less than 20 hertz
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Answer: C
Q682011 · 21 Aug 2011
The image formed by a convex mirror of a real object is larger than the object ( $u = object distance$ , $f = focal length$ )
1. A.when $u < 2 f$
2. B.when $u > 2 f$
3. C.for all values of $u$
4. D.for no value of $u$
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Answer: D
Q692011 · 21 Aug 2011
Protons and neutrons are bound in a nucleus by the
1. A.short range ‘weak interaction’
2. B.short range ‘strong interaction’
3. C.long range ‘electromagnetic interaction’
4. D.long range ‘gravitational interaction’
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Answer: B
Q722011 · 21 Aug 2011
Momentum of a body is 1. a vector quantity. 2. a conserved quantity in an isolated system. 3. same as force in linear motion. Select the correct answer using the code given below:
1. A.1 and 3 only
2. B.2 and 3 only
3. C.1 and 2 only
4. D.1, 2 and 3
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Answer: C
Q732011 · 21 Aug 2011
If the ratio of the weight of a man in a stationary lift and when it is moving downwards with uniform acceleration ‘a’ is 3 : 2, then the value of ‘a’ is
1. A.3g/2
2. B.g/3
3. C.g
4. D.2g/3
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Answer: B
Q742011 · 21 Aug 2011
A body is thrown upward against the gravity ‘g’ with initial velocity ‘u’. Which one among the following is the correct expression for its final velocity when attains the maximum height?
1. A. $u^{2} / (2 g)$
2. B. $2 g / u^{2}$
3. C. $u^{2} g /2$
4. D.None of the above
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Answer: D
Q752011 · 21 Aug 2011
Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
1. A.8.9 N
2. B.9.8 N
3. C.89 N
4. D.98 N
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Answer: B
Q772011 · 21 Aug 2011
It is impossible for two oscillators, each excuting simple harmonic motion, to remain in phase with each other if they have different
1. A.time periods
2. B.amplitudes
3. C.spring constants
4. D.kinetic energy
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Answer: A
Q832011 · 21 Aug 2011
Thermometer A and B have ice points marked at 15° and 25° and steam points at 75° and 125° respectively. When thermometer A measures the temperature of a bath as 60°, the reading of B for the same bath is
1. A.60°
2. B.75°
3. C.90°
4. D.100°
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Answer: D
Q852011 · 21 Aug 2011
Potential at a point due to a point charge is V. The charge is doubled and also the distance of the point from the charge is doubled. The new potential is
1. A.V/2
2. B.4V
3. C.V
4. D.2V
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Answer: C
Q862011 · 21 Aug 2011
Which one among the following is used to make periscope?
1. A.Concave lens
2. B.Concave mirror
3. C.Plane mirror
4. D.None of the above
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Answer: C
Q872011 · 21 Aug 2011
Kilowatt-hour is the unit of
1. A.potential difference
2. B.electric power
3. C.electric energy
4. D.electric potential
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Answer: C
Q882011 · 21 Aug 2011
A stable nucleus (light with $A < 10$ ) has
1. A.exactly the same number of neutrons and protons
2. B.more neutrons than protons
3. C.no neutrons
4. D.no protons
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Answer: Dropped in the final answer key (full marks to everyone)
Q962011 · 21 Aug 2011
What is the power of the lens, if the far point of a short-sighted eye is 200 cm?
1. A. $- 0.5$ D
2. B.2 D
3. C.1 D
4. D. $- 1.5$ D
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Answer: A
Q972011 · 21 Aug 2011
Which one among the following is correct for resultant of balanced forces?
1. A.It is zero
2. B.It is non-zero
3. C.It varies continuously
4. D.None of the above
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Answer: A
Q982011 · 21 Aug 2011
Three resistance coils of $1 Ω$ , $2 Ω$ and $3 Ω$ are connected in series. If the combination is connected to a battery of $9 V$ , what is the potential drop across the resistance coil of $3 Ω$ ?
1. A.2.0 volt
2. B.3.0 volt
3. C.4.5 volt
4. D.6.0 volt
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Answer: C
Q992011 · 21 Aug 2011
An electric lamp of 100 watt is used for 10 hours per day. The 'units' of energy consumed in one day by the lamp is
1. A.1 unit
2. B.0.1 unit
3. C.10 units
4. D.100 units
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Answer: A
Q522011 · 17 Apr 2011
A body initially at rest is acted upon by a constant force. The rate of change of its kinetic energy varies :
1. A.linearly with square root of time.
2. B.linearly with time.
3. C.linearly with square of time.
4. D.inversely with time.
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Answer: B
Q532011 · 17 Apr 2011
A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s the air speed of the plane is :
1. A.166 m/s
2. B.66·4 km/s
3. C.332 m/s
4. D.664 m/s
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Answer: D
Q542011 · 17 Apr 2011
Which one among the following statements is correct?
1. A.Convex mirrors are used by doctors to examine oral cavity
2. B.Concave mirrors are used as reflectors
3. C.Convex mirrors are used as reflectors
4. D.Convex mirrors should be used for shaving
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Answer: B
Q552011 · 17 Apr 2011
Light travels in optical fibre irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of :
1. A.diffraction of light
2. B.refraction of light
3. C.polarization of light
4. D.total internal reflection of light
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Answer: D
Q562011 · 17 Apr 2011
A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's :
1. A.First law of motion.
2. B.Second law of motion.
3. C.Third law of motion.
4. D.First, second and third laws of motion.
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Answer: C
Q572011 · 17 Apr 2011
Which one among the following is the major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification?
1. A.Air turbulence of earth's atmosphere
2. B.Poor optical polish achievable on large mirrors
3. C.Poor tracking capacities of telescopes
4. D.Varying density of air in the Earth's atmosphere
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Answer: A
Q582011 · 17 Apr 2011
Bats can ascertain distances, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted :
1. A.ultrasonic waves from the bat.
2. B.ultrasonic waves from the distant objects.
3. C.supersonic waves from the bat.
4. D.supersonic waves from the distant objects.
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Answer: A