Physics · NDA previous year questions

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2017 34 questions

Q582017 · 23 Apr 2017
In a solenoid, the current flowing through the wire is $I$ and number of turns per unit length is $n$ . This gives a magnetic field $B$ inside the solenoid. If number of turn per unit length is increased to $2 n$ , what will be the value of magnetic field in the solenoid ?
1. A. $B$
2. B. $2 B$
3. C. $B /2$
4. D. $B /4$
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Answer: B
Q612017 · 23 Apr 2017
The radii of curvature of the faces of a double convex lens are 10 cm and 20 cm. The refractive index of the glass is 1.5. What is the power of this lens (in units of dioptre)?
1. A.+7.5 D
2. B.−7.5 D
3. C.+2.5 D
4. D.+5.0 D
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Answer: A
Q622017 · 23 Apr 2017
The time period of a simple pendulum made using a thin copper wire of length $L$ is $T$ . Suppose the temperature of the room in which this simple pendulum is placed increases by $3 0^{\circ} C$ , what will be the effect on the time period of the pendulum?
1. A. $T$ will increase slightly
2. B. $T$ will remain the same
3. C. $T$ will decrease slightly
4. D. $T$ will become more than 2 times
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Answer: A
Q632017 · 23 Apr 2017
Which one of the following physical quantity has the same unit as that of pressure?
1. A.Angular momentum
2. B.Stress
3. C.Strain
4. D.Work
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Answer: B
Q652017 · 23 Apr 2017
Which one of the following physical quantities does NOT affect the resistance of a cylindrical resistor?
1. A.The current through it
2. B.Its length
3. C.The resistivity of the material used in the resistor
4. D.The area of cross-section of the cylinder
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Answer: A
Q662017 · 23 Apr 2017
Which one of the following is the correct relation between frequency $f$ and angular frequency $ω$ ?
1. A. $f = π ω$
2. B. $ω = 2 π f$
3. C. $f = 2 ω / π$
4. D. $f = 2 π ω$
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Answer: B
Q682017 · 23 Apr 2017
If the potential difference applied to an X-ray tube is doubled while keeping the separation between the filament and the target as same, what will happen to the cutoff wavelength?
1. A.Will remain same
2. B.Will be doubled
3. C.Will be halved
4. D.Will be four times of the original wavelength
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Answer: C
Q692017 · 23 Apr 2017
Which one of the following statements is true for the relation $F = \frac{G m _{1} m _{2}}{r ^{2}}$ ? (All symbols have their usual meanings)
1. A.The quantity G depends on the local value of $g$ , acceleration due to gravity
2. B.The quantity G is greatest at the surface of the Earth
3. C.The quantity G is used only when earth is one of the two masses
4. D.The quantity G is a universal constant
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Answer: D
Q702017 · 23 Apr 2017
If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what will be the ratio of velocity of light in glass and water?
1. A.3 : 4
2. B.4 : 3
3. C.8 : 7
4. D.8 : 9
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Answer: D
Q852017 · 23 Apr 2017
Why is it difficult to measure the coefficient of expansion of a liquid than solid?
1. A.Liquids tend to evaporate at all temperatures
2. B.Liquids conduct more heat
3. C.Liquids expand too much when heated
4. D.Their containers also expand when heated
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Answer: D
Q962017 · 23 Apr 2017
At which place Earth's magnetic field becomes horizontal ?
1. A.Magnetic meridian
2. B.Magnetic equator
3. C.Geographical pole
4. D.Tropic of Cancer
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Answer: B
Q982017 · 23 Apr 2017
Suppose a rod is given a negative charge by rubbing it with wool. Which one of the following statements is correct in this case?
1. A.The positive charges are transferred from rod to wool
2. B.The positive charges are transferred from wool to rod
3. C.The negative charges are transferred from rod to wool
4. D.The negative charges are transferred from wool to rod
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Answer: D

2016 35 questions

Q512016 · 18 Sept 2016
Which one of the following statements is not correct?
1. A.The longest wavelength of light visible to human eye is about 700 nm
2. B.The shortest wavelength of light visible to human eye is about 400 nm
3. C.The wavelength of gamma rays is longer than that of X-rays
4. D.The ability of a telescope to form separable images of close objects is called its resolving power
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Answer: C
Q522016 · 18 Sept 2016
If the image of an object, formed by a concave mirror is virtual, erect and magnified, then the object is placed
1. A.at the principal focus
2. B.at the centre of curvature
3. C.beyond the centre of curvature
4. D.between the pole of the mirror and the principal focus
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Answer: D
Q532016 · 18 Sept 2016
When three resistors, each having resistance $r$ , are connected in parallel, their resultant resistance is $x$ . If these three resistances are connected in series, the total resistance will be
1. A. $3 x$
2. B. $3 r x$
3. C. $9 x$
4. D. $3/ x$
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Answer: C
Q552016 · 18 Sept 2016
Along a streamline flow of fluid
1. A.the velocity of all fluid particles at a given instant is constant
2. B.the speed of a fluid particle remains constant
3. C.the velocity of all fluid particles crossing a given position is constant
4. D.the velocity of a fluid particle remains constant
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Answer: C
Q562016 · 18 Sept 2016
How is the kinetic energy of a moving object affected if the net work done on it is positive?
1. A.Decreases
2. B.Increases
3. C.Remains constant
4. D.Becomes zero
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Answer: B
Q572016 · 18 Sept 2016
A particle is executing simple harmonic motion. Which one of the following statements about the acceleration of the oscillating particle is true?
1. A.It is always in the opposite direction to velocity
2. B.It is proportional to the frequency of oscillation
3. C.It is minimum when the speed is maximum
4. D.It decreases as the potential energy increases
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Answer: C
Q582016 · 18 Sept 2016
Which one of the following four particles, whose displacement $x$ and acceleration $a_{x}$ are related as follows, is executing simple harmonic motion?
1. A. $a_{x} = + 3 x$
2. B. $a_{x} = + 3 x^{2}$
3. C. $a_{x} = - 3 x^{2}$
4. D. $a_{x} = - 3 x$
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Answer: D
Q602016 · 18 Sept 2016
Which one of the following statements is correct?
1. A.The speed of sound waves in a medium depends upon the elastic property of the medium but not on inertia property
2. B.The speed of sound waves in a medium depends upon the inertia property of the medium but not on elastic property
3. C.The speed of sound waves in a medium depends neither on its elastic property nor on its inertia property
4. D.The speed of sound waves in a medium depends both on elastic and inertia properties of the medium
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Answer: D
Q622016 · 18 Sept 2016
A particle executes linear simple harmonic motion with amplitude of 2 cm. When the particle is at 1 cm from the mean position, the magnitudes of the velocity and the acceleration are equal. Then its time period (in seconds) is
1. A. $\frac{2 π}{3}$
2. B. $\frac{3}{2 π}$
3. C. $\frac{3}{π}$
4. D. $\frac{1}{2 π 3}$
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Answer: A
Q632016 · 18 Sept 2016
When a ray of light enters a glass slab, then
1. A.only the frequency changes
2. B.frequency and velocity change
3. C.frequency does not change
4. D.frequency and wavelength change
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Answer: C
Q642016 · 18 Sept 2016
A ball is thrown vertically upward from the ground with a speed of 25.2 m/s. The ball will reach the highest point of its journey in
1. A.5.14 s
2. B.3.57 s
3. C.2.57 s
4. D.1.29 s
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Answer: C
Q652016 · 18 Sept 2016
When sound waves are propagated through a medium, the physical quantity/quantities transmitted is/are
1. A.matter only
2. B.energy only
3. C.energy and matter only
4. D.energy, momentum and matter
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Answer: B
Q662016 · 18 Sept 2016
Pressure is a scalar quantity because
1. A.it is the ratio of force to area and both force and area are vectors
2. B.it is the ratio of magnitude of force to area
3. C.it is the ratio of component of force (normal to area) to area
4. D.none of the above
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Answer: C