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2011 46 questions

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
Q592011 · 17 Apr 2011
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by :
1. A.the theory of relativity.
2. B.Newton's first law.
3. C.Newton's second law.
4. D.Newton's third law.
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Answer: B
Q602011 · 17 Apr 2011
The material used for electric fuse is an alloy of tin and lead. This alloy should have :
1. A.high specific resistance and low melting point.
2. B.low specific resistance and high melting point.
3. C.low specific resistance and low melting point.
4. D.high specific resistance and high melting point.
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Answer: A
Q612011 · 17 Apr 2011
Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?
1. A.0·50 m
2. B.2 m
3. C.half of your height.
4. D.twice your height.
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Answer: C
Q622011 · 17 Apr 2011
Light travels slower in glass than in air because :
1. A.refractive index of air is less than that of glass.
2. B.refractive index of air is greater than that of glass.
3. C.density of glass is greater than that of air.
4. D.density of glass is less than that of air.
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Answer: A
Q632011 · 17 Apr 2011
The lines of force of a uniform magnetic field :
1. A.must be convergent.
2. B.must be divergent.
3. C.must be parallel to each other.
4. D.intersect.
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Answer: C
Q642011 · 17 Apr 2011
A Jet engine works on the principle of conservation of :
1. A.linear momentum.
2. B.angular momentum.
3. C.energy.
4. D.mass.
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Answer: A
Q652011 · 17 Apr 2011
The surface temperature of the Sun is nearly :
1. A.2000 K
2. B.4000 K
3. C.6000 K
4. D.8000 K
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Answer: C
Q662011 · 17 Apr 2011
If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :
1. A.super conductor.
2. B.semiconductor.
3. C.conductor.
4. D.insulator.
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Answer: A
Q672011 · 17 Apr 2011
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :
1. A.converging lens.
2. B.diverging lens.
3. C.plano-converging lens.
4. D.plano-diverging lens.
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Answer: B
Q682011 · 17 Apr 2011
'The stars seem to be higher on the sky than they actually are'. This can be explained by :
1. A.atmospheric refraction.
2. B.dispersion of light.
3. C.total internal reflection.
4. D.diffraction of light.
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Answer: A
Q712011 · 17 Apr 2011
Mass of B is four times that of A. B moves with a velocity half that of A. Then B has :
1. A.kinetic energy equal to that of A.
2. B.half the kinetic energy of A.
3. C.twice the kinetic energy of A.
4. D.kinetic energy one-fourth of A.
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Answer: A
Q722011 · 17 Apr 2011
In a pressure cooker cooking is faster because the increase in vapour pressure :
1. A.increases the specific heat.
2. B.decreases the specific heat.
3. C.decreases the boiling point.
4. D.increases the boiling point.
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Answer: D
Q732011 · 17 Apr 2011
Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel :
1. A.paramagnetic substances.
2. B.ferromagnetic substances.
3. C.diamagnetic substances.
4. D.non-magnetic substances.
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Answer: C
Q742011 · 17 Apr 2011
When a ray of light is going from one medium to another, its :
1. A.wavelength remains same.
2. B.frequency remains same.
3. C.frequency increases.
4. D.wavelength increases.
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Answer: B
Q822011 · 17 Apr 2011
Iron nails are dipped into blue copper sulphate solution. After some time iron nails are :
1. A.dissolved and blue colour is discharged.
2. B.dissolved but blue colour is not discharged.
3. C.not dissolved and blue colour is not discharged.
4. D.not dissolved but blue colour is discharged.
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Answer: A
Q862011 · 17 Apr 2011
Which of the following statements about diamond are correct? 1. It is used as a gem in jewellery because of its ability to reflect light 2. It is a good conductor of electricity 3. It is used for cutting glass, marble stones and other hard materials 4. It is used for drilling of rocks Select the correct answer using the code given below :
1. A.1, 3 and 4
2. B.2, 3 and 4
3. C.1, 2 and 3
4. D.2 and 4 only
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Answer: A
Q1002011 · 17 Apr 2011
Directions
Directions :— The following Six (06) items consist of two statements, statement I and statement II. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : Statement I : A myopic person is advised to use concave lens
Statement II : The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina
1. A.Both the statements are individually true and statement II is the correct explanation of statement I
2. B.Both the statements are individually true but statement II is not the correct explanation of statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but statement II is true
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Answer: A