Physics · NDA previous year questions

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2009 45 questions

Q812009 · 30 Aug 2009
An object is placed at a distance of $12 cm$ from a convex lens on its principal axis and a virtual image of certain size is formed. If the object is moved further $8 cm$ away from the lens, a real image of the same size as that of the virtual image is formed. Which one of the following is the focal length of the lens?
1. A. $15 cm$
2. B. $16 cm$
3. C. $18 cm$
4. D. $20 cm$
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Answer: B
Q822009 · 30 Aug 2009
Different objects at different distances are seen by the eye. The parameter that remains constant is
1. A.the focal length of the eye lens
2. B.the object distance from the eye lens
3. C.the radii of curvature of the eye lens
4. D.the image distance from the eye lens
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Answer: D
Q832009 · 30 Aug 2009
A spring has length 'l' and spring constant 'k'. It is cut into two pieces of lengths $l_{1}$ and $l_{2}$ such that $l_{1} = n l_{2}$ . The force constant of the spring of length $l_{1}$ is
1. A. $k (1 + n)$
2. B. $k$
3. C. $k / (n + 1)$
4. D. $k [(n + 1) / n]$
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Answer: D
Q852009 · 30 Aug 2009
Water flows out of the hole of a bucket and follows a parabolic path. If the bucket falls freely under gravity, the water flow (ignoring air resistance)
1. A.follows a straight-line path relative to the falling bucket
2. B.follows a parabolic path relative to the falling bucket
3. C.stops
4. D.decreases but continues to flow
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Answer: C
Q862009 · 30 Aug 2009
$1 gm$ of ice at $0^{\circ} C$ is mixed with $1 gm$ of steam at $100^{\circ} C$ . After thermal equilibrium, the temperature of the mixture is
1. A. $0^{\circ} C$
2. B. $50^{\circ} C$
3. C. $80^{\circ} C$
4. D. $100^{\circ} C$
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Answer: D
Q982009 · 30 Aug 2009
Consider the following statements regarding aluminium paint : 1. It is fairly good heat-resistant. 2. It possesses good electrical resistance. 3. It cannot be used for hot water pipe. Which of the statements given above is/are correct?
1. A.1 and 3
2. B.1 only
3. C.1 and 2
4. D.2 and 3
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Answer: C
Q682009 · 19 Apr 2009
Non-conductors, whose polarization is caused by an electric field, are known as
1. A.Semi-conductors
2. B.Super-conductors
3. C.Dielectrics
4. D.Resistive conductors
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Answer: C
Q692009 · 19 Apr 2009
The resistance of a wire that must be placed parallel with a $12 Ω$ resistance to obtain a combined resistance of $4 Ω$ is
1. A. $2 Ω$
2. B. $4 Ω$
3. C. $6 Ω$
4. D. $8 Ω$
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Answer: C
Q702009 · 19 Apr 2009
One light year is equal to
1. A. $9.46 \times 1 0^{- 15} m$
2. B. $9.46 \times 1 0^{15} m$
3. C. $9.46 \times 1 0^{- 13} m$
4. D. $9.46 \times 1 0^{13} m$
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Answer: B
Q722009 · 19 Apr 2009
What is the mass of one litre of cottonseed oil of density $926 kg/ m^{3}$ ?
1. A. $926 kg$
2. B. $92.6 kg$
3. C. $0.926 kg$
4. D. $9260 kg$
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Answer: C
Q732009 · 19 Apr 2009
The wavelength of X-rays is of the order of
1. A.1 mm
2. B.1 cm
3. C.1 micron
4. D.1 angstrom
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Answer: D
Q742009 · 19 Apr 2009
In vacuum, the speed of light
1. A.depends on its wavelength
2. B.depends on its frequency
3. C.depends on its intensity
4. D.neither depends on its wavelength, frequency nor intensity
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Answer: D
Q752009 · 19 Apr 2009
Which one of the following statements correctly defines power ?
1. A.Energy supplied per unit time
2. B.Energy of an object due to its motion
3. C.Energy of an object due to its position
4. D.None of the above
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Answer: A
Q762009 · 19 Apr 2009
The electric charge is stored in a device called
1. A.Inductor
2. B.Capacitor
3. C.Resistor
4. D.Transformer
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Answer: B
Q772009 · 19 Apr 2009
Consider the following parts of spectra : 1. Visible 2. Infrared 3. Ultraviolet 4. Microwave Which one of the following is the correct sequence in which their wavelengths increase ?
1. A.4 - 3 - 1 - 2
2. B.4 - 1 - 2 - 3
3. C.3 - 2 - 1 - 4
4. D.3 - 1 - 2 - 4
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Answer: D
Q792009 · 19 Apr 2009
Which one of the following is not electromagnetic in nature ?
1. A.Cathode-rays
2. B.X-rays
3. C.Gamma-rays
4. D.Infrared-rays
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Answer: A
Q802009 · 19 Apr 2009
1. A. $5 A$
2. B. $10 A$
3. C. $15 A$
4. D. $20 A$
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Answer: C
Q812009 · 19 Apr 2009
The force experienced by a unit positive test charge placed at a point is called
1. A.Magnetic field at that point
2. B.Gravitational field at that point
3. C.Electrical field at that point
4. D.Nuclear field at that point
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Answer: C
Q822009 · 19 Apr 2009
A long jumper runs before jumping because he
1. A.covers a greater distance
2. B.maintains momentum conservation
3. C.gains energy by running
4. D.gains momentum
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Answer: D
Q832009 · 19 Apr 2009
Which among the following is the necessary condition for simple harmonic motion ?
1. A.Constant period
2. B.Constant acceleration
3. C.Displacement and acceleration are proportional
4. D.Displacement and torque are proportional
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Answer: C
Q852009 · 19 Apr 2009
If an $α$ -particle is projected normally through a uniform magnetic field, then the path of the $α$ -particle inside the field will be
1. A.circular
2. B.parabolic
3. C.elliptic
4. D.a straight line
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Answer: A
Q862009 · 19 Apr 2009
How far must a girl stand in front of a concave spherical mirror of radius $120 cm$ to see an erect image of her face four times its natural size ?
1. A. $40 cm$ from the mirror
2. B. $45 cm$ from the mirror
3. C. $50 cm$ from the mirror
4. D. $55 cm$ from the mirror
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Answer: B
Q872009 · 19 Apr 2009
Match List I with List II and select the correct answer using the code given below the lists : List I ( $Type of electromagnetic radiation$ ) List II ( $Approximate wavelength in metres$ ) A. Infrared radiation B. X-rays C. Ultraviolet radiation D. Gamma rays 1. $1 0^{- 12}$ 2. $1 0^{- 5}$ 3. $1 0^{- 10}$ 4. $1 0^{- 8}$ Code : A B C D
1. A.2 3 4 1
2. B.1 4 3 2
3. C.1 3 4 2
4. D.2 4 3 1
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Answer: A
Q882009 · 19 Apr 2009
1. A.Fundamental
2. B.First overtone
3. C.Second overtone
4. D.Third overtone
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Answer: C
Q892009 · 19 Apr 2009
A sonometer wire having a length of $50 cm$ is vibrating in the fundamental mode with a frequency of $100 Hz$ . Which of the following is the type of propagating wave and its speed ?
1. A.Longitudinal, $50 m/s$
2. B.Transverse, $50 m/s$
3. C.Longitudinal, $100 m/s$
4. D.Transverse, $100 m/s$
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Answer: D