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2010 42 questions

Q822010 · 22 Aug 2010
Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?
1. A.180°
2. B.90°
3. C.45°
4. D.0°
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Answer: D
Q832010 · 22 Aug 2010
Which one of the following four glass lenses is a diverging lens?
1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D
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Answer: A
Q842010 · 22 Aug 2010
Magnetism of a bar magnet can be destroyed if it is : 1. kept in the magnetic meridian. 2. placed in a direction opposite that of the Earth's horizontal intensity. 3. heated to a temperature known as Curie temperature. Select the correct answer using the code given below :
1. A.1 and 3 only
2. B.2 only
3. C.2 and 3 only
4. D.1, 2 and 3
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Answer: C
Q862010 · 22 Aug 2010
If two conducting spheres are separately charged and then brought in contact :
1. A.the total energy of the two spheres is conserved
2. B.the total charge on the spheres is conserved
3. C.both the total energy and charge are conserved
4. D.the final potential is always the mean of the original potential of the two spheres
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Answer: B
Q892010 · 22 Aug 2010
The direction of magnetic field at a point due to an infinitely long wire carrying current is :
1. A.parallel to the current
2. B.antiparallel to the current
3. C.along the perpendicular drawn from a point on the wire
4. D.perpendicular to the plane containing the conductor and the point
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Answer: D
Q912010 · 22 Aug 2010
A man is sitting on a rotating stool with his arms outstretched. If suddenly he folds his arm the angular velocity of the man would :
1. A.increase
2. B.decrease
3. C.become zero
4. D.remain constant
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Answer: A
Q922010 · 22 Aug 2010
For a particle revolving in a circular path, the acceleration of the particle is :
1. A.along the tangent
2. B.along the radius
3. C.zero
4. D.along the circumference of the circle
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Answer: B
Q932010 · 22 Aug 2010
A circus performer of mass M is walking along a wire as shown in the figure given above. The tension T in the wire is : (g = acceleration due to gravity)
1. A.approximately Mg
2. B.less than Mg
3. C.more than Mg
4. D.depends on whether the performer stands on one or two feet
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Answer: C
Q952010 · 22 Aug 2010
The visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belong?
1. A.X-ray
2. B.Gamma ray
3. C.Infrared
4. D.Ultraviolet
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Answer: D
Q962010 · 22 Aug 2010
Microwave oven consumes less power due to :
1. A.small frequency of radiation
2. B.short wavelength of radiation
3. C.large frequency as well as wavelength of radiation
4. D.small frequency as well as wavelength of radiation
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Answer: A
Q972010 · 22 Aug 2010
The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000°C. The constancy of solar temperature is due to :
1. A.fission
2. B.radioactivity
3. C.fusion
4. D.black hole evaporation
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Answer: C
Q982010 · 22 Aug 2010
An annular solar eclipse occurred during January 2010 with duration of annularity around 12 minutes. It is predicted that such long annular duration will not occur till the year 3043. Such prediction is possible due to :
1. A.Einstein's theory of relativity
2. B.Darwin's theory of natural selection
3. C.Newton's theory of gravitation
4. D.Hawking's theory of black hole
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Answer: C
Q632010 · 18 Apr 2010
'Pitch' is a characteristic of sound that depends upon its
1. A.intensity
2. B.frequency
3. C.quality
4. D.None of the above
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Answer: B
Q652010 · 18 Apr 2010
The effective resistance of three equal resistances, each of resistance $r$ , connected in parallel, is
1. A. $3/ r$
2. B. $r /3$
3. C. $3 r$
4. D. $r^{3}$
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Answer: B
Q662010 · 18 Apr 2010
A fan produces a feeling of comfort during hot weather, because
1. A.our body radiates more heat in air
2. B.fan supplies cool air
3. C.conductivity of air increases
4. D.our perspiration evaporates rapidly
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Answer: D
Q682010 · 18 Apr 2010
The ratio of velocity of X-rays to that of gamma rays
1. A.is $< 1$
2. B.is $> 1$
3. C.is 1
4. D.depends upon the ratio of their frequencies
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Answer: C
Q692010 · 18 Apr 2010
Which one of the following pairs of rays is electromagnetic in nature?
1. A.Beta rays and gamma rays
2. B.Cathode rays and X-rays
3. C.Alpha rays and beta rays
4. D.X-rays and gamma rays
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Answer: D
Q702010 · 18 Apr 2010
The magnetic lines of force due to a bar magnet
1. A.intersect inside the body of the magnet
2. B.intersect at neutral points only
3. C.intersect only at north and south poles
4. D.cannot intersect at all
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Answer: D
Q712010 · 18 Apr 2010
The specific resistance of a conducting wire depends upon
1. A.length of the wire, area of cross-section of the wire and material of the wire
2. B.length of the wire and area of cross-section of the wire but not on the material of the wire
3. C.material of the wire only but neither on the length of the wire nor on the area of cross-section of the wire
4. D.length of the wire only but neither on the area of cross-section of the wire nor on the material of the wire
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Answer: C
Q732010 · 18 Apr 2010
Which one of the statements given below is not correct?
1. A.A vertical plane passing through the axis of a freely suspended magnet is called the magnetic meridian
2. B.A vertical plane passing through the axis of rotation of the Earth is called the geographical meridian
3. C.The degree to which the magnetic field can penetrate a medium is known as the relative permeability of the medium
4. D.The relative permeability is not a dimensionless quantity
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Answer: D
Q742010 · 18 Apr 2010
If an object is placed at the centre of curvature of a concave mirror, the position of the image is
1. A.at the principal focus
2. B.between the principal focus and the centre of curvature
3. C.at the centre of curvature
4. D.beyond the centre of curvature
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Answer: C
Q752010 · 18 Apr 2010
The radius of curvature of a plane mirror
1. A.is zero
2. B.is infinity
3. C.can be anywhere between zero and infinity
4. D.None of the above
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Answer: B
Q762010 · 18 Apr 2010
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
1. A.reflection of light
2. B.refraction of light
3. C.total internal reflection of light
4. D.interference of light
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Answer: B
Q772010 · 18 Apr 2010
A ray of light falls on a transparent glass plate. A part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for
1. A.angle of incidence equal to 90°
2. B.angle of incidence equal to zero
3. C.only one angle of incidence
4. D.more than one angle of incidence
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Answer: C
Q782010 · 18 Apr 2010
A man with a dark skin, in comparison with a man with a white skin, will experience
1. A.less heat and less cold
2. B.less heat and more cold
3. C.more heat and less cold
4. D.more heat and more cold
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Answer: D