Physics · NDA previous year questions

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2023 42 questions

Q512023 · 3 Sept 2023
The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the path of light beams are visible to us because
1. A.dust particles in the air reflect light into our eyes
2. B.dust particles in the air scatter light into our eyes
3. C.dust particles in the air refract light into our eyes
4. D.dust particles in the air polarize light into our eyes
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Answer: B
Q522023 · 3 Sept 2023
The flash of lightning is seen before the thunderstorm is heard. It verifies that
1. A.sound travels much faster than light
2. B.light travels much faster than sound
3. C.light and sound both travel with same speed
4. D.intensity of flash of lightning is very high during thunderstorm
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Answer: B
Q532023 · 3 Sept 2023
The potential difference between the two end terminals of an electric heater is 220 V and the current through it is 0.5 A. What would be the current through the heater if the potential difference across the terminals of the heater is reduced to 120 V?
1. A.1.0 A
2. B.0.5 A
3. C.0.27 A
4. D.0.7 A
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Answer: C
Q552023 · 3 Sept 2023
Sita, 1.5 m high, stands before a plane mirror fixed on a wall to view her full image. What should be the minimum height of the plane mirror so that Sita can view her image fully?
1. A.0.50 m
2. B.0.35 m
3. C.0.75 m
4. D.0.25 m
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Answer: C
Q592023 · 3 Sept 2023
Which one of the following graphs correctly represents the current (I) - voltage (V) variation for a rectangular piece of a semiconductor wafer?
1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D
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Answer: C
Q722023 · 3 Sept 2023
Which one of the following is the usual unit of measurement for Air Pressure used in India?
1. A.Centimeter
2. B.Millibar
3. C.Milligram
4. D.Milliliter
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Answer: B
Q732023 · 3 Sept 2023
Ram records the odometer readings of his car for the distance covered from 2000 km at the start of his journey and 2400 km at the end of the journey after 8 hours. What is the average speed of the car?
1. A.50 km/h
2. B.60 km/h
3. C.70 km/h
4. D.80 km/h
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Answer: A
Q752023 · 3 Sept 2023
Ramesh cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
1. A.+ 0.5 D
2. B.- 0.5 D
3. C.+ 0.2 D
4. D.- 0.2 D
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Answer: B
Q762023 · 3 Sept 2023
Which of the following statements are correct about the electrical resistance and resistivity of a wire? 1. Both quantities depend on the area of cross-section of the wire 2. Both depend on the temperature 3. Resistance of the wire is directly proportional to the resistivity of the wire 4. Resistivity of the wire is directly proportional to the length of the wire Select the correct answer using the code given below:
1. A.1 and 2
2. B.1 and 3
3. C.2 and 3
4. D.2 and 4
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Answer: C
Q772023 · 3 Sept 2023
A liquid is heated up to a certain temperature. Which one of the following situation would correspond to the boiling of the liquid?
1. A.When atmospheric pressure becomes equal to the vapour pressure
2. B.When atmospheric pressure becomes less than vapour pressure
3. C.When atmospheric pressure becomes higher than the vapour pressure
4. D.When vapour pressure becomes equal to the air pressure
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Answer: A
Q882023 · 3 Sept 2023
Which of the following arrangement of resistors offers minimum effective resistance between points X and Y?
1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D
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Answer: A
Q892023 · 3 Sept 2023
What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the direction of motion of the charges? (Assume that both kind of charges are NOT going to recombine)
1. A.Both kind of charges will stop moving
2. B.Positive charges and negative charges will separate out
3. C.Positive charges will stop but negative charges will continue moving uninterrupted
4. D.Both kind of charges will keep moving uninterrupted
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Answer: D
Q902023 · 3 Sept 2023
The motion of a particle of mass m is described by the relation, $y = u t - \frac{1}{2} g t^{2}$ , where u is the initial velocity of the particle. The force acting on the particle is
1. A. $F = m (\frac{d u}{d t})$
2. B. $F = m g$
3. C. $F = m (\frac{d y}{d t})$
4. D. $F = - m g$
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Answer: D
Q912023 · 3 Sept 2023
A block of wood $40 cm \times 20 cm \times 10 cm)$ is kept on a tabletop in three different positions: (a) with its side of dimensions $20 cm \times 10 cm$ ; (b) with its side of dimensions $10 cm \times 40 cm$ ; and (c) with its side of dimensions $40 cm \times 20 cm$ . The pressure exerted by the wooden block on the tabletop in these positions is represented by $P_{A}$ , $P_{B}$ and $P_{C}$ , respectively. The pressure follows the trend
1. A. $P_{A} > P_{B} > P_{C}$
2. B. $P_{A} < P_{B} < P_{C}$
3. C. $P_{A} = P_{B} = P_{C}$
4. D. $P_{A} < P_{B} = P_{C}$
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Answer: A
Q972023 · 3 Sept 2023
Which one of the following graphs represents the equation of motion v = u + at; where all quantities are non-zero and symbols carry their usual meanings?
1. A.Option A
2. B.Option B
3. C.Option C
4. D.Option D
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Answer: D
Q982023 · 3 Sept 2023
Which one of the following statements is true for sound waves propa- gating in air?
1. A.Sound is an electromagnetic wave and transverse in nature
2. B.Sound is a mechanical wave and longitudinal in nature
3. C.Sound is a mechanical wave and transverse in nature
4. D.Sound is an electromagnetic wave and longitudinal in nature
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Answer: B
Q992023 · 3 Sept 2023
A 100 g sphere is moving at a speed of 20 m/s and collides with another. sphere of mass 50 g. If the second sphere was at rest prior to the collision and the first sphere comes at rest immediately after the collision, considering the collision to be elastic, the speed of the second sphere would be
1. A.10 m/s
2. B.20 m/s
3. C.30 m/s
4. D.40 m/s
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Answer: D
Q1002023 · 3 Sept 2023
Which one of the following optical phenomena supports that the light is a transverse wave?
1. A.Refraction
2. B.Diffraction
3. C.Interference
4. D.Polarization
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Answer: D
Q512023 · 16 Apr 2023
1. A. $W_{1} = 5 kg$ and $W_{2} = 10 kg$
2. B. $W_{1} = 10 kg$ and $W_{2} = 5 kg$
3. C. $W_{1} = 5 kg$ and $W_{2} = 5 kg$
4. D. $W_{1} = 10 kg$ and $W_{2} = 10 kg$
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Answer: D
Q522023 · 16 Apr 2023
A stone is thrown horizontally from the top of a $20 m$ high building with a speed of $12 m/s$ . It hits the ground at a distance R from the building. Taking $g = 10 m/ s^{2}$ and neglecting air resistance will give :
1. A. $R = 12 m$
2. B. $R = 18 m$
3. C. $R = 24 m$
4. D. $R = 30 m$
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Answer: C
Q532023 · 16 Apr 2023
A sphere of volume $V$ is made of a material with lower density than water. While on Earth, it floats on water with its volume $f_{1} V (f_{1} < 1)$ submerged. On the other hand, on a spaceship accelerating with acceleration $a < g$ ( $g$ is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is $f_{2} V$ . Then:
1. A. $f_{2} = f_{1}$
2. B. $f_{2} = (1 - \frac{a}{g}) f_{1}$
3. C. $f_{2} > f_{1}$
4. D. $f_{2} = \frac{a}{g} f_{1}$
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Answer: A
Q542023 · 16 Apr 2023
1. A. $P_{1} = P_{2}$
2. B. $P_{1} = 4 P_{2}$
3. C. $P_{1} = 2 P_{2}$
4. D. $P_{1} = 8 P_{2}$
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Answer: C
Q552023 · 16 Apr 2023
A particle is moving in a circle of radius R with a constant speed v. Its average acceleration over the time when it moves over half the circle is :
1. A. $\frac{v ^{2}}{R}$
2. B. $\frac{π v ^{2}}{2 R}$
3. C. $\frac{2 v ^{2}}{π R}$
4. D.0
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Answer: C
Q562023 · 16 Apr 2023
Two forces of 5⋅0 N each are acting on a point mass. If the angle between the forces is 60°, then the net force acting on the point mass has magnitude close to :
1. A.8⋅6 N
2. B.4⋅3 N
3. C.5⋅0 N
4. D.6⋅7 N
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Answer: A
Q692023 · 16 Apr 2023
A rectangle ABCD is kept in front of a concave mirror of focal length f with its corners A and B being, respectively, at distances 2f and 3f from the mirror with AB along the principal axis as shown in the figure. It forms an image A'B'C'D' in front of the mirror. What is the ratio of B'C' to A'D'?
1. A.1
2. B.2
3. C. $\frac{1}{2}$
4. D. $\frac{2}{3}$
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Answer: C