Physics · NDA previous year questions

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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
Q682016 · 18 Sept 2016
The free fall acceleration g increases as one proceeds, at sea level, from the equator toward either pole. The reason is
1. A.Earth is a sphere with same density everywhere
2. B.Earth is a sphere with different density at the polar regions than in the equatorial regions
3. C.Earth is approximately an ellipsoid having its equatorial radius greater than its polar radius by 21 km
4. D.Earth is approximately an ellipsoid having its equatorial radius smaller than its polar radius by 21 km
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Answer: C
Q692016 · 18 Sept 2016
MCQ (More than One Correct Answer) Which one of the following statements is correct?
1. A.The measurement of mass taken by a spring weighing balance is correct at the place where the spring balance is calibrated for
2. B.The measurement of mass taken by a spring weighing balance is correct at all places
3. C.The measurement of mass taken by a spring weighing balance is correct at the places where the acceleration due to gravity is same with the place where the spring balance is calibrated for
4. D.A spring balance cannot be used to measure mass at any place
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Answer: A, C
Q702016 · 18 Sept 2016
Which one of the following is not a contact force?
1. A.Push force
2. B.Gravitational force
3. C.Frictional force
4. D.Strain force
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Answer: B
Q712016 · 18 Sept 2016
When a force of 1 newton acts on a mass of 1 kg which is able to move freely, the object moves in the direction of force with a/an
1. A.speed of 1 km/s
2. B.acceleration of 1 $m/ s^{2}$
3. C.speed of 1 m/s
4. D.acceleration of 1 $km/ s^{2}$
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Answer: B
Q732016 · 18 Sept 2016
Two balls, $A$ and $B$ , are thrown simultaneously, $A$ vertically upward with a speed of $20 m/s$ from the ground and $B$ vertically downward from a height of $40 m$ with the same speed and along the same line of motion. At what points do the two balls collide by taking acceleration due to gravity as $9.8 m/ s^{2}$ ?
1. A.The balls will collide after 3s at a height of 30.2 m from the ground
2. B.The balls will collide after 2s at a height of 20.1 m from the ground
3. C.The balls will collide after 1s at a height of 15.1 m from the ground
4. D.The balls will collide after 5s at a height of 20 m from the ground
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Answer: C
Q1012016 · 18 Sept 2016
One kilowatt hour is equal to
1. A. $36 \times 1 0^{3}$ joule
2. B. $36 \times 1 0^{5}$ joule
3. C. $1 0^{3}$ joule
4. D. $1 0^{5}$ joule
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Answer: B
Q512016 · 17 Apr 2016
Consider the following circuit : The equivalent resistance of the circuit will be
1. A. $12 Ω$
2. B. $8 \frac{11}{12} Ω$
3. C. $9 \frac{1}{11} Ω$
4. D. $\frac{24}{25} Ω$
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Answer: C
Q522016 · 17 Apr 2016
A racing car accelerates on a straight road from rest to a speed of 50 m/s in 25 s. Assuming uniform acceleration of the car throughout, the distance covered in this time will be
1. A.625 m
2. B.1250 m
3. C.2500 m
4. D.50 m
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Answer: A
Q542016 · 17 Apr 2016
A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be
1. A.2000 J
2. B.4000 J
3. C.8000 J
4. D.1000 J
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Answer: C
Q552016 · 17 Apr 2016
A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is
1. A.40 cm
2. B.60 cm
3. C.80 cm
4. D.120 cm
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Answer: C
Q562016 · 17 Apr 2016
A simple circuit contains a 12 V battery and a bulb having 24 ohm resistance. When you turn on the switch, the ammeter connected in the circuit would read
1. A.0·5 A
2. B.2 A
3. C.4 A
4. D.5 A
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Answer: A
Q572016 · 17 Apr 2016
Three resistors with magnitudes 2, 4 and 8 ohm are connected in parallel. The equivalent resistance of the system would be
1. A.less than 2 ohm
2. B.more than 2 ohm but less than 4 ohm
3. C.4 ohm
4. D.14 ohm
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Answer: A