Physics · NDA previous year questions

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2018 41 questions

Q672018 · 9 Sept 2018
The wavelength of X-rays is of the order of
1. A.1 Å
2. B.1 μm
3. C.1 mm
4. D.1 cm
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Answer: A
Q682018 · 9 Sept 2018
Consider the following velocity and time graph: Which one of the following is the value of average acceleration from 8 s to 12 s?
1. A. $8 m/ s^{2}$
2. B. $12 m/ s^{2}$
3. C. $2 m/ s^{2}$
4. D. $- 1 m/ s^{2}$
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Answer: D
Q692018 · 9 Sept 2018
If the focal length of a convex lens is 50 cm, which one of the following is its power?
1. A.+2 dioptre
2. B.+0.02 dioptre
3. C.−0.5 dioptre
4. D.+0.5 dioptre
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Answer: A
Q722018 · 9 Sept 2018
The refractive indices of two media are denoted by $n_{1}$ and $n_{2}$ , and the velocities of light in these two media are respectively $v_{1}$ and $v_{2}$ . If $n_{2} / n_{1}$ is 1.5, which one of the following statements is correct?
1. A. $v_{1}$ is 1.5 times $v_{2}$ .
2. B. $v_{2}$ is 1.5 times $v_{1}$ .
3. C. $v_{1}$ is equal to $v_{2}$ .
4. D. $v_{1}$ is 3 times $v_{2}$ .
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Answer: A
Q732018 · 9 Sept 2018
Which one of the following statements is correct for a plane mirror?
1. A.Its focal length is zero.
2. B.The size of the image of an object placed in front of the mirror is slightly less than that of the object.
3. C.The image is virtual, erect and laterally inverted.
4. D.Its focal length is 200 cm.
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Answer: C
Q742018 · 9 Sept 2018
An object is placed in front of a convex mirror. Which one of the following statements is correct?
1. A.It will never form an inverted image.
2. B.The image moves towards the focus when the object moves towards the mirror.
3. C.Depending on the position of the object with respect to the mirror, the image can be inverted and real.
4. D.The size of the image becomes larger than that of the object when the object is placed at a distance equal to half the focal length.
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Answer: A
Q752018 · 9 Sept 2018
A circular coil of radius $R$ having $N$ number of turns carries a steady current $I$ . The magnetic induction at the centre of the coil is 0.1 tesla. If the number of turns is doubled and the radius is halved, which one of the following will be the correct value for the magnetic induction at the centre of the coil?
1. A.0.05 tesla
2. B.0.2 tesla
3. C.0.4 tesla
4. D.0.8 tesla
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Answer: C
Q512018 · 22 Apr 2018
Which one of the following statements is correct?
1. A.Any energy transfer that does not involve temperature difference in some way is not heat
2. B.Any energy transfer always requires a temperature difference
3. C.On heating the length and volume of the object remain exactly the same
4. D.Whenever there is a temperature difference, heat is the only way of energy transfer
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Answer: A
Q522018 · 22 Apr 2018
If T is the time period of an oscillating pendulum, which one of the following statements is NOT correct?
1. A.The motion repeats after time T only once
2. B.T is the least time after which motion repeats itself
3. C.The motion repeats itself after nT, where n is a positive integer
4. D.T remains the same only for small angular displacements
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Answer: A
Q532018 · 22 Apr 2018
If an object moves with constant velocity then which one of the following statements is NOT correct?
1. A.Its motion is along a straight line
2. B.Its speed changes with time
3. C.Its acceleration is zero
4. D.Its displacement increases linearly with time
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Answer: B
Q542018 · 22 Apr 2018
An object is moving with uniform acceleration a. Its initial velocity is u and after time t its velocity is v. The equation of its motion is v = u + at. The velocity (along y-axis) time (along x-axis) graph shall be a straight line
1. A.passing through origin
2. B.with x-intercept u
3. C.with y-intercept u
4. D.with slope u
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Answer: C
Q552018 · 22 Apr 2018
What is the net force experienced by a bar magnet placed in a uniform magnetic field?
1. A.Zero
2. B.Depends upon length of the magnet
3. C.Never zero
4. D.Depends upon temperature
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Answer: A
Q572018 · 22 Apr 2018
Which one of the following is the value of 1 kWh of energy converted into joules?
1. A. $1.8 \times 1 0^{6}$ J
2. B. $3.6 \times 1 0^{6}$ J
3. C. $6.0 \times 1 0^{6}$ J
4. D. $7.2 \times 1 0^{6}$ J
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Answer: B
Q592018 · 22 Apr 2018
Whether an object will float or sink in a liquid, depends on
1. A.mass of the object only
2. B.mass of the object and density of liquid only
3. C.difference in the densities of the object and liquid
4. D.mass and shape of the object only
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Answer: C
Q602018 · 22 Apr 2018
Which one of the following devices is non-ohmic?
1. A.Conducting copper coil
2. B.Electric heating coil
3. C.Semi conductor diode
4. D.Rheostat
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Answer: C
Q612018 · 22 Apr 2018
Which one of the following is the natural phenomenon based on which a simple periscope works?
1. A.Reflection of light
2. B.Refraction of light
3. C.Dispersion of light
4. D.Total internal reflection of light
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Answer: A
Q622018 · 22 Apr 2018
Which one of the following frequency ranges is sensitive to human ears?
1. A.0 – 200 Hz
2. B.20 – 20,000 Hz
3. C.200 – 20,000 Hz only
4. D.2,000 – 20,000 Hz only
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Answer: B
Q632018 · 22 Apr 2018
Which of the following statements about a fluid at rest in a cup is/are correct? 1. Pressure is same at all the points in the fluid. 2. Pressure is exerted on the walls. 3. Pressure exists everywhere in the fluid. Select the correct answer using the code given below :
1. A.1 and 2 only
2. B.2 and 3 only
3. C.1 only
4. D.1, 2 and 3
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Answer: B
Q642018 · 22 Apr 2018
Which one of the following devices is used to measure atmospheric pressure?
1. A.Ammeter
2. B.Barometer
3. C.Potentiometer
4. D.Lactometer
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Answer: B
Q652018 · 22 Apr 2018
Which of the following statements about latent heat for a given substance is/are correct? 1. It is fixed at a given temperature. 2. It depends upon the temperature and volume. 3. It is independent of temperature and volume. 4. It depends on the temperature but independent of volume. Select the correct answer using the code given below:
1. A.2
2. B.1 and 3
3. C.4 only
4. D.1 and 4
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Answer: D
Q662018 · 22 Apr 2018
MCQ (More than One Correct Answer) Which one of the following statements about the mass of a body is correct?
1. A.It changes from one place to another
2. B.It is same everywhere
3. C.It depends on its shape
4. D.It does not depend on its temperature
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Answer: B, D
Q682018 · 22 Apr 2018
Which of the following statements about specific heat of a body is/are correct? 1. It depends upon mass and shape of the body 2. It is independent of mass and shape of the body 3. It depends only upon the temperature of the body Select the correct answer using the code given below :
1. A.1 only
2. B.2 and 3
3. C.1 and 3
4. D.2 only
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Answer: D
Q692018 · 22 Apr 2018
Which one of the following is an example of the force of gravity of the earth acting on a vibrating pendulum bob?
1. A.Applied force
2. B.Frictional force
3. C.Restoring force
4. D.Virtual force
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Answer: C
Q712018 · 22 Apr 2018
Which one of the following statements about magnetic field lines is NOT correct?
1. A.They can emanate from a point
2. B.They do not cross each other
3. C.Field lines between two poles cannot be precisely straight lines at the ends
4. D.There are no field lines within a bar magnet
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Answer: D
Q722018 · 22 Apr 2018
Two convex lenses with power 2 dioptre are kept in contact with each other. The focal length of the combined lens system is
1. A.0.10 m
2. B.2 m
3. C.4 m
4. D.0.25 m
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Answer: D