# NDA General Knowledge Physics Questions and Answers

NDA general knowledge physics questions and answers below , NDA Physics Practice MCQs is very important for every aspirant preparing for NDA because it will help you to understand the level and type of questions asked in the general ability test of NDA exam. NDA Physics mock test pdf free download to check your preparation of physics regarding NDA .we have provided below Important Physics Questions for NDA Exam which is based on Previous Papers to practice and test your weak points and preparation level .

Physics is a very important sub-section of the General Ability test(GAT) of the NDA & NA exam. Almost 23-25 questions of approx 60 marks are asked from the different topics of Physics in the NDA 1 exam.The NDA physics questions shared below will help you understand the type of questions that are commonly asked in this sub-section.

We have provided 30 important practise questions of physics for NDA as per the latest syllabus prescribed by UPSC .

### Instruction to attempt :

• Below are 30 MCQs questions of whole physics syllabus of NDA .
• Take a page and put number from 1 to 30 on left side to make it as answer sheet .
• Take a separate copy / rough page for calculation .
• Start a timer of 30 min before starting to solve the questions.
• Be honest with yourself and don’t forget to comment yours marks in the comment section below .

1) An iron needle sinks in water whereas a ship made of iron floats on it because

(a) the edge of the needle is pointed
(b) the ship is flat
(c) the ship is driven by powerful engine
(d) specific gravity of the needle is greater than that of water displaced by it.

2) The cloudy nights are warmer than clear nights because
(a) clouds prevent escape of radiation of heat from the ground and the air.
(b) absorb sunlight in the day and radiate the same in night.
(c) clouds make the atmosphere damp and generate heat.
(d) clouds obstruct the movement of air which creates heat.

3) Food gets cooked faster in a pressure cooker because
(a) water starts boiling at a lower temperature due to high pressure
(b) water starts boiling at a higher temperature due to high pressure
(c) water boils only at 100°C but the heat content is higher at high pressure
(d) convection currents are set inside the cooker

4) It is more comfortable to wear white cloths in summer because
(a) they reflect heat falling on them.
(b) they radiate heat tansferred from the body.
(c) they absorb perspiration.
(d) they are soothing to the eye.

5) Of the two bulbs in a house, one glows brighter than the other. Which of the following statements is correct?
(a) The brightness does not depend on resistance.
(b) Both the bulbs have the same resistance.
(c) The brighter bulb has larger resistance.
(d) The dimmer bulb has larger resistance.

6) A fluorescent tube is preferred to an electric bulb because
(a) it has a larger light emitting surface.
(b) voltage fluctuations do not affect it.
(c) in a tube electrical energy is almost converted into light.
(d) None of these

7) Consider the following statements in respect of a
jet engine and a rocket:

• A jet engine uses the surrounding air for
its oxygen supply and so is unsuitable for
motion in space.
• A rocket carries its own supply of oxygen in
the gas form as a fuel.

Which of the above statement(s) is/are correct?
(a) 1 only

(b) 2 only
(c) Both 1 and 2

(d) Neither 1 nor 2

8) The leaning tower of Pisa does not fall because
(a) it is tappered at the top.
(b) it covers a large base area.
(c) its centre of gravity remains at the lowest position.
(d) the vertical line through the centre of gravity of the tower falls within the base.

9) Given below are two statements:
Assertion (A): Universe is expanding.
Reason (R): The result is based on red shift of spectra of galaxies.

Codes:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

10) Electronic motors operating at low voltages tend to burn out because
(a) they draw more current which is inversely proportional to the voltage.
(b) they draw more current which is inversely proportional to the square root of the voltage.
(c) they draw heat proportional to V2.
(d) low voltage sets in electrical discharge.

11) If the doors of a refrigerator are left open for a few hours, the room temperature will
(a) decrease
(b) increase
(c) remain the same
(d) decrease only in the area in the vicinity of the refrigerator

12) If a rock is brought from the surface of the moon to the earth, then
(a) its mass will change.
(b) its weight will change but not its mass.
(c) both mass and weight will change.
(d) both mass and weight will remain the same.

13) Match List-I with List-II and select the correct answer using the codes given below the lists:

Codes:
A B C D
(a) 2 3 4 1
(b) 1 2 3 4
(c) 2 3 1 4
(d) 2 1 3 4

14) Match List-I with List-II and select the correct answer with the help of codes given below:

Codes:
A B C D
(a) 2 1 3 4
(b) 1 2 4 3
(c) 1 2 3 4
(d) 2 1 4 3

15) Which one of the following statements is not true about cosmic rays?
(a) They have very high frequency.
(b) They have very high wavelength.
(c) They are made of highly energetic charged particles.
(d) They originate from the sun.

16) Pendulum clocks become slow in summer because
(a) days in summer are large.
(b) of the friction in the coil.
(c) the length of the pendulum increases.
(d) the weight of the pendulum changes.

17) Consider the following statements and select the correct code:
Assertion (A): A piece of ice added to the drinkcools it.
Reason (R): Ice takes latent heat from the drink for melting resulting in the cooling of the drink.

Codes:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

18) Match List-I with List-II and select the correct answer using the codes given below the lists:

Codes:
A B C D
(a) 1 3 2 4
(b) 1 3 4 2
(c) 3 1 2 4
(d) 3 1 4 2

19) The atmosphere exerts enormous pressure on us. But, we don’t feel it because
(a) our blood exerts a pressure slightly more than that of the atmosphere.
(b) we are used to it.
(c) our bones are very strong and can withstand the pressure.
(d) the surface area of our head is very small.

20) Which one of the following statements is not true for a person suffering from hypermetropia?
(a) The person can see far objects distinctly.
(b) The focal length of the lens is large.
(c) The image of the close object is focussed behind the retina.
(d) A concave lens is used to correct this defect.

21) Consider the following statements and select the correct answer using the codes given below:
Assertion (A): If ice collects on the freezer, the cooling in the refrigerator is affected adversely.
Reason (R): Ice is a poor conductor.

Codes:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

22) The minimum height of a plane mirror to see the full size image of a person is equal to
(a) the height of the person
(b) half the height of the person
(c) one-fourth the height of the person
(d) double the height of the person

23) A hydrogen-inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will
(a) decrease in size
(b) flatten into a disc-like shape
(c) increase in size
(d) maintain the same size and shape

24) Magnetic resonance imaging is based on the phenomenon of
(a) nuclear magnetic resonance
(b) electron spin resonance
(c) electron paramagnetic resonance
(d) diamagnetism of human tissues

25) A man is standing on a boat in still water. If he walks towards the shore, the boat will
(a) move towards the shore
(b) move away from the shore
(c) remain stationary
(d) sink

26) An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of
(a) refraction of light
(b) reflection of light
(c) total internal reflection of light
(d) dispersion of light

27) A piece of ice is floating in a beaker containing water. When whole of the ice melts
(a) the level of water will come down.
(b) the level of water will come up.
(c) the level of water will first rise and then fall.
(d) the level of water will remain the same.

28) A man inside a moving train tosses a coin, the coin falls behind him. The train is moving
(a) forward with a uniform speed
(b) backward with a uniform speed
(c) forward with deceleration
(d) forward with acceleration

29) A fan produces a feeling of comfort during hot weather because
(a) fan supplies cool air
(b) our body radiates more heat in air
(c) conductivity of air increases
(d) our perspiration evaporates rapidly

30) Rainbow is formed due to a combination of
(a) refraction and absorption
(b) dispersion and diffraction
(c) refraction and scattering
(d) dispersion and total internal reflection

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