Physics · NDA previous year questions

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2015 23 questions

Q512015 · 27 Sept 2015
Which one of the following statements is correct?
1. A.The image formed by a concave mirror for an object lying at infinity is at the principal focus, highly diminished, real and inverted
2. B.A ray of light parallel to the principal axis after reflection from a concave mirror appears to diverge from the principal focus of the mirror
3. C.The focal length of a spherical mirror is double of its radius of curvature
4. D.A ray of light travelling from a rarer medium to a denser medium bends away from the normal
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Answer: A
Q522015 · 27 Sept 2015
MCQ (More than One Correct Answer) Which one of the following statements is not correct?
1. A.In steady flow of a liquid, the velocity of liquid particles reaching at a particular point is the same at all points
2. B.Steady flow is also called streamlined flow
3. C.In steady flow, each particle may not follow the same path as taken by a previous particle passing through that point
4. D.Two streamlines cannot intersect each other
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Answer: A, C
Q532015 · 27 Sept 2015
A brass ball is tied to a thin wire and swung so as to move uniformly in a horizontal circle. Which of the following statements in this regard is / are true? 1. The ball moves with constant velocity 2. The ball moves with constant speed 3. The ball moves with constant acceleration 4. The magnitude of the acceleration of the ball is constant Select the correct answer using the code given below:
1. A.1 only
2. B.1 and 3
3. C.1, 2 and 4
4. D.2 and 4 only
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Answer: D
Q542015 · 27 Sept 2015
Two long wires each carrying a d.c. current in the same direction are placed close to each other. Which one of the following statements is correct?
1. A.The wires will attract each other
2. B.The wires will repel each other
3. C.There will be no force between the wires
4. D.There will be a force between the wires only at the moment when the current is switched ON or OFF
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Answer: A
Q552015 · 27 Sept 2015
The absolute zero, i.e., temperature below which is not achievable, is about:
1. A. $0^{\circ} C$
2. B. $- 273 K$
3. C. $- 273^{\circ} C$
4. D. $- 300^{\circ} C$
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Answer: C
Q562015 · 27 Sept 2015
Lightning conductors are used to protect building from lightning strikes. Which of the following statements is / are true about lightning conductors? 1. Lightning conductors create an electric field at its top so that lightning strikes it preferentially 2. Lightning conductors reduce the effect of the strike by uniformly distributing the charge (current) over the surface of the building 3. Lightning conductors take all charge (current) to deep down in the earth 4. Lightning conductors must be installed at a place taller than the building Select the correct answer using the code given below:
1. A.1 and 2
2. B.3 and 4 only
3. C.1, 3 and 4
4. D.4 only
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Answer: C
Q572015 · 27 Sept 2015
The silvering in thermos flasks is done to avoid heat transfer by:
1. A.Convection
2. B.Conduction
3. C.Radiation
4. D.Both convection and conduction
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Answer: C
Q582015 · 27 Sept 2015
Conservation of momentum in a collision between particles can be understood on the basis of:
1. A.Newton’s first law of motion
2. B.Newton’s second law of motion only
3. C.Both Newton’s second law of motion and Newton’s third law of motion
4. D.Conservation of energy
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Answer: C
Q592015 · 27 Sept 2015
Two forces, one of 3 newton and another of 4 newton are applied on a standard 1 kg body, placed on a horizontal and frictionless surface, simultaneously along the x-axis and the y-axis, respectively, as shown below: The magnitude of the resultant acceleration is:
1. A. $7 m/ s^{2}$
2. B. $1 m/ s^{2}$
3. C. $5 m/ s^{2}$
4. D. $7 m/ s^{2}$
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Answer: C
Q602015 · 27 Sept 2015
Magnetic meridian is an imaginary:
1. A.line along north-south
2. B.point
3. C.vertical plane
4. D.horizontal plane
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Answer: C
Q612015 · 27 Sept 2015
In SI unit of force ‘Newton’ (N) is given by (where m stands for metre and s stands for second):
1. A. $1 N = 1 kg/m s^{2}$
2. B. $1 N = 1 kgm/ s^{2}$
3. C. $1 N = 1 kg s^{2} /m$
4. D. $1 N = 1 kg m s^{2}$
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Answer: B
Q622015 · 27 Sept 2015
The acceleration due to gravity ‘g’ for objects on or near the surface of earth is related to the universal gravitational constant ‘G’ as (‘M’ is the mass of the earth and ‘R’ is its radius):
1. A. $G = g \frac{M}{R ^{2}}$
2. B. $g = G \frac{M}{R ^{2}}$
3. C. $M = \frac{g G}{R ^{2}}$
4. D. $R = \frac{g G}{M ^{2}}$
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Answer: B
Q632015 · 27 Sept 2015
The loudness of sound is related to:
1. A.its frequency
2. B.its amplitude
3. C.its speed
4. D.its pitch
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Answer: B
Q642015 · 27 Sept 2015
X-rays are electromagnetic radiation whose wavelengths are of the order of:
1. A.1 metre
2. B. $1 0^{- 1}$ metre
3. C. $1 0^{- 5}$ metre
4. D. $1 0^{- 10}$ metre
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Answer: D
Q662015 · 27 Sept 2015
Which one of the following statements is not correct?
1. A.The radius of curvature of a concave mirror is twice its focal length
2. B.Power of a convex lens is negative and that of a concave lens is positive
3. C.The radius of curvature of a plane mirror is infinity
4. D.When a ray of light passes from an optically denser medium to an optically rarer medium, the angle of refraction is greater than the corresponding angle of incidence
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Answer: B
Q672015 · 27 Sept 2015
Which one of the following statements is not correct?
1. A.If the velocity and acceleration have opposite sign, the object is slowing down
2. B.If the velocity is zero at an instant, the acceleration should also be zero at that instant
3. C.If the velocity is zero for a time interval; the acceleration is zero at any instant within the time interval
4. D.If the position and velocity have opposite sign, the object is moving towards the origin
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Answer: B
Q682015 · 27 Sept 2015
Three equal resistances when combined in series are equivalent to 90 ohm. Their equivalent resistance when combined in parallel will be:
1. A.10 ohm
2. B.30 ohm
3. C.270 ohm
4. D.810 ohm
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Answer: A
Q692015 · 27 Sept 2015
The following figure represents the velocity-time graph of a moving car on a road: Which segment of the graph represents the retardation?
1. A.AB
2. B.BC
3. C.CD
4. D.None
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Answer: B
Q702015 · 27 Sept 2015
Which one of the following statements is not correct?
1. A.The Kelvin scale of temperature is called the Absolute scale
2. B.Visible light radiation has wavelength range of 400—700 nm
3. C.The capacity to do work is called power
4. D.The wavelength of Gamma rays is less than that of X-rays
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Answer: C
Q712015 · 27 Sept 2015
A man is sitting in a train which is moving with a velocity of 60 km/hour. His speed with respect to the train is:
1. A.10/3 m/s
2. B.60 m/s
3. C.infinite
4. D.zero
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Answer: D
Q742015 · 27 Sept 2015
The resistance of a wire of length l and area of cross-section a is x ohm. If the wire is stretched to double its length, its resistance would become:
1. A.2 x ohm
2. B.0.5 x ohm
3. C.4 x ohm
4. D.6 x ohm
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Answer: C
Q792015 · 27 Sept 2015
Addition of gypsum to cement:
1. A.reduces setting time of cement
2. B.produces very light colour cement
3. C.increases setting time of cement
4. D.shining surface is formed
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Answer: C
Q842015 · 27 Sept 2015
White Phosphorus glows in the dark due to:
1. A.amorphous character
2. B.slow oxidation
3. C.high ignition temperature
4. D.good conducting property of electricity
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Answer: B