Physics · NDA previous year questions

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2013 42 questions

Q642013 · 14 Apr 2013
If an object undergoes a uniform circular motion, then its
1. A.acceleration remains uniform
2. B.velocity changes
3. C.speed changes
4. D.velocity remains uniform
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Answer: B
Q652013 · 14 Apr 2013
A car is moving with a uniform speed. However its momentum is changing. Then the car
1. A.may be on an elliptical path
2. B.is moving on a straight path without acceleration
3. C.is moving on a straight path with acceleration
4. D.is moving without any acceleration
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Answer: A
Q662013 · 14 Apr 2013
Ohm’s law defines
1. A.a resistance
2. B.current only
3. C.voltage only
4. D.both current and voltage
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Answer: A
Q792013 · 14 Apr 2013
A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is
1. A.zero
2. B.towards the centre of the circle
3. C.away from the centre along the radius of the circle
4. D.perpendicular to the radius and along the velocity
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Answer: B
Q802013 · 14 Apr 2013
An object is undergoing a non-accelerated motion. Its rate of change in momentum is
1. A.a non-zero constant
2. B.zero
3. C.not a constant
4. D.None of the above
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Answer: B
Q822013 · 14 Apr 2013
Imagine a current-carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
1. A.clockwise
2. B.anti-clockwise
3. C.into the page
4. D.out of the page
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Answer: A
Q862013 · 14 Apr 2013
1. A.The velocity of the particle is uniform
2. B.The velocity of the particle is non-uniform
3. C.The speed is uniform and the particle is moving on a circular path
4. D.The speed is non-uniform and the particle is moving on a straight line path
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Answer: A
Q872013 · 14 Apr 2013
The human eye is like a camera and hence it contains a system of lens. The eye lens forms
1. A.a straight or upright, real image of the object on the retina
2. B.an inverted, virtual image of the object on the retina
3. C.an inverted, real image of the object on the retina
4. D.a straight or upright, real image of the object on the iris
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Answer: C
Q912013 · 14 Apr 2013
An object is placed at the focus of a concave mirror. The image will be
1. A.real, inverted, same size at the focus
2. B.real, upright, same size at the focus
3. C.virtual, inverted, highly enlarged at infinity
4. D.real, inverted, highly enlarged at infinity
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Answer: D
Q922013 · 14 Apr 2013
An optician prescribes a power $= - 0.5 dioptre$ . The corresponding lens must be a
1. A.convex lens of focal length $2 m$
2. B.convex lens of focal length $50 cm$
3. C.concave lens of focal length $2 m$
4. D.concave lens of focal length $50 cm$
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Answer: C
Q942013 · 14 Apr 2013
A particle is moving freely. Then its
1. A.kinetic energy is always greater than zero
2. B.potential energy is greater than zero and kinetic energy is less than zero
3. C.potential energy is less than zero and kinetic energy is greater than zero
4. D.potential energy is zero and kinetic energy is less than zero
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Answer: A
Q952013 · 14 Apr 2013
The displacement of a particle at time $t$ is given by $x = a \hat{i} + b t \hat{j} + \frac{c}{2} t^{2} \hat{k}$ where $a, b$ and $c$ are positive constants. Then the particle is
1. A.accelerated along $\hat{k}$ -direction
2. B.decelerated along $\hat{k}$ -direction
3. C.decelerated along $\hat{j}$ -direction
4. D.accelerated along $\hat{j}$ -direction
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Answer: A
Q962013 · 14 Apr 2013
Gravitational force shares a common feature with electromagnetic force. In both cases, the force is
1. A.between massive and neutral objects
2. B.between charged objects
3. C.a short range
4. D.a long range
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Answer: D
Q972013 · 14 Apr 2013
The spread in colours in a rainbow on sky is primarily due to
1. A.dispersion of sunlight
2. B.reflection of sunlight
3. C.refraction of sunlight
4. D.total internal reflection of sunlight
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Answer: A
Q982013 · 14 Apr 2013
A force $F$ is applied on a body (which moves on a straight line) for a duration of $3 s$ . The momentum of the body changes from $10 g cm/s$ to $40 g cm/s$ . The magnitude of the force $F$ is
1. A.10 dynes
2. B.10 newtons
3. C.120 dynes
4. D.12 dynes
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Answer: A
Q992013 · 14 Apr 2013
Specific gravity of silver is 11 and specific gravity of iron is 8. Which one among the following is the approximate relative density of silver with respect to iron?
1. A.1.4
2. B.0.7
3. C.3.0
4. D.2.8
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Answer: A
Q1012013 · 14 Apr 2013
A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is
1. A.towards south
2. B.towards east
3. C.in downward direction
4. D.in upward direction
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Answer: D