Physics · NDA previous year questions

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2024 39 questions

Q822024 · 1 Sept 2024
An incandescent electric bulb converts 20% of its power consumption into light, and the remaining power is dissipated as heat. The bulb's filament has a resistance of 200 Ω and 2 A current flows through it. If the bulb remains ON for 10 h and the rate of electricity charge is Rs. 5/unit, then which among the following is the correct amount for the money spent on producing light?
1. A.Rs. 5
2. B.Rs. 6
3. C.Rs. 7
4. D.Rs. 8
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Answer: D
Q832024 · 1 Sept 2024
Which one of the following statements best defines the concept of heat?
1. A.The transformation of energy from one form to another
2. B.The conversion of energy into mass and vice-versa due to temperature difference
3. C.The transfer of energy due to temperature difference
4. D.The change in volume of a substance with temperature
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Answer: C
Q842024 · 1 Sept 2024
The masses of two planets are in the ratio of 1:7. The ratio between their diameters is 2: 1. The ratio of forces which they exert on each other is
1. A.1 : 7
2. B.7 : 1
3. C.1 : 1
4. D.2 : 1
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Answer: C
Q852024 · 1 Sept 2024
A car weighs 1000 kg. It is moving with a uniform velocity of 72 km/h towards a straight road. The driver suddenly presses the brakes. The car stops in 0.2 s. The retarding force applied on the car to stop it is
1. A.100 N
2. B.1000 N
3. C.10 kN
4. D.100 kN
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Answer: D
Q862024 · 1 Sept 2024
There is a ball of mass 320 g. It has 625 J potential energy when released freely from a height. The speed with which it will hit the ground is
1. A.62.5 m/s
2. B.2.0 m/s
3. C.50 m/s
4. D.40 m/s
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Answer: A
Q872024 · 1 Sept 2024
Starting from rest a vehicle accelerates at the rate of $2 m/ s^{2}$ towards east for $10 s$ . It then stops suddenly. It then accelerates again at a rate of $42 m/ s^{2}$ for next $10 s$ towards south and then again comes to rest. The net displacement of the vehicle from the starting point is
1. A. $100 m$
2. B. $200 m$
3. C. $300 m$
4. D. $400 m$
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Answer: C
Q912024 · 1 Sept 2024
At which temperature does liquid water show maximum density?
1. A.299 K
2. B.277 K
3. C.285 K
4. D.373 K
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Answer: B
Q982024 · 1 Sept 2024
Which one among the following is the correct focal length of a combination of lenses of power 2.5 D and -2.0 D?
1. A.+0.5 m
2. B.-0.5 m
3. C.+2.0 m
4. D.-2.0 m
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Answer: C
Q992024 · 1 Sept 2024
The AC mains domestic supply current in India changes direction in every
1. A.50 s
2. B. $\frac{1}{50}$ s
3. C.100 s
4. D. $\frac{1}{100}$ s
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Answer: D
Q1002024 · 1 Sept 2024
A block of mass 20 kg slides on a rough horizontal plane surface. Let the speed of the block at a particular instant is 10 m/s. It comes to rest after travelling a distance of 20 m. Which one of the following could be the magnitude of the frictional force?
1. A.10 N
2. B.20 N
3. C.40 N
4. D.50 N
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Answer: D
Q1022024 · 1 Sept 2024
MCQ (More than One Correct Answer) The figure given below shows the direction of the two forces P and Q acting on a skydiver : Which one among the following statements is correct about the two forces?
1. A.Force P is caused by the gravity and force Q is caused by the friction
2. B.When the force P is bigger than the force Q, the speed of the skydiver remains the same
3. C.After the parachute opens, force P remains the same while force Q increases
4. D.After the parachute opens, force P decreases while force Q increases
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Answer: A, C
Q512024 · 21 Apr 2024
1. A. $0Ω$
2. B. $2 + 25 Ω$
3. C. $2 + 5 Ω$
4. D. $\inftyΩ$
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Answer: B
Q522024 · 21 Apr 2024
1. A.1.0 mA
2. B.1.2 mA
3. C.3.0 mA
4. D.5.0 mA
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Answer: C
Q532024 · 21 Apr 2024
If the current through an electrical machine running on direct current is $15 A$ and the machine runs for 10 minutes, the charge that passes through the machine during this time is:
1. A. $1.50 C$
2. B. $150 C$
3. C. $900 C$
4. D. $9000 C$
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Answer: D
Q552024 · 21 Apr 2024
Which of the following forces is/are fundamental in nature? 1. Gravitational force 2. Electromagnetic forces 3. Strong and weak nuclear forces Select the correct answer using the code given below :
1. A.1 only
2. B.1 and 2 only
3. C.2 and 3 only
4. D.1, 2 and 3
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Answer: D
Q562024 · 21 Apr 2024
A spherical shell of outer radius R and inner radius R/2 contains a solid sphere of radius R/2 (see figure). The density of the material of the solid sphere is ρ and that of the shell is ρ/2. What is the average mass density of the larger sphere thus formed?
1. A.3ρ/4
2. B.9ρ/16
3. C.7ρ/8
4. D.5ρ/8
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Answer: B
Q572024 · 21 Apr 2024
The human eye is like a camera that has a lens with :
1. A.fixed focal length and fixed aperture size.
2. B.variable focal length and fixed aperture size.
3. C.fixed focal length and variable aperture size.
4. D.variable focal length and variable aperture size.
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Answer: D
Q692024 · 21 Apr 2024
A uniform meter scale of mass 0.24 kg is made of steel. It is kept on two wedges, W₁ and W₂, in a horizontal position. W₁ is at a distance of 0.2 m from one of its ends, while W₂ is at a distance of 0.4 m from the other end. If the force on the scale is N₁ due to W₁ and N₂ due to W₂, then : (take g = 10.0 m s⁻²)
1. A.N₁ = 1.6 N and N₂ = 0.8 N
2. B.N₁ = 0.8 N and N₂ = 1.6 N
3. C.N₁ = 0.6 N and N₂ = 1.8 N
4. D.N₁ = 1.8 N and N₂ = 0.6 N
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Answer: C
Q702024 · 21 Apr 2024
Escape speed from the Earth is close to 11.2 km s⁻¹. On another planet whose radius is half of the Earth's radius and whose mass density is four times that of the Earth, the escape speed in km s⁻¹ will be close to :
1. A.11.2
2. B.15.8
3. C.5.6
4. D.7.9
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Answer: A
Q722024 · 21 Apr 2024
A ball of 0.1 kg mass is dropped on a hard floor from a height of 0.45 m and rises to a height of 0.2 m. If it was in touch with the floor for 0.1 s, the net force it applied on the floor while bouncing is : (take the gravitational acceleration g = 10 m s⁻²)
1. A.1.0 N
2. B.6.0 N
3. C.3.0 N
4. D.5.0 N
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Answer: D
Q732024 · 21 Apr 2024
Which one of the following statements regarding simple pendulum is correct? Simple pendulum has a time period independent of amplitude:
1. A.only for small amplitudes because then the net force on its bob is independent of its displacement.
2. B.for any amplitude because the net force on the bob is always proportional to its displacement.
3. C.for any amplitude because the net force on the bob is independent of its displacement.
4. D.only for small amplitudes because then the net force on its bob is proportional to its displacement.
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Answer: D
Q742024 · 21 Apr 2024
Which one of the following about different frictional forces is correct?
1. A.Kinetic friction > Static friction > Rolling friction
2. B.Static friction > Rolling friction > Kinetic friction
3. C.Static friction > Kinetic friction > Rolling friction
4. D.Static friction > Kinetic friction = Rolling friction
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Answer: C
Q792024 · 21 Apr 2024
Which one among the following statements with reference to the properties of water is not correct?
1. A.The specific heat of water is abnormally high.
2. B.Latent heat of fusion of water is very low.
3. C.Density of water is higher than ice.
4. D.Pure water is a non-conductor of electricity.
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Answer: B
Q912024 · 21 Apr 2024
If the block P as shown in the figure below were to be at rest, what should the magnitude of force F be?
1. A.5 N
2. B.6 N
3. C.8 N
4. D.10 N
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Answer: C
Q932024 · 21 Apr 2024
Consider the following electric circuit : The current in the above electric circuit is :
1. A.1 A
2. B.(10/15) A
3. C.2 A
4. D.1.5 A
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Answer: A