Physics Questions and Answers updated daily – General Knowledge

Physics Questions: Solved 254 Physics Questions and answers section with explanation for various online exam preparation, various interviews, General Knowledge Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

Physics Questions

1. The filament of a bulb is made up of?




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Correct Ans:Tungsten
Explanation:
The filament of a bulb is made up of tungstenbecause tungsten has a very high melting point. (3695 K),

Hence, option C is correct.
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2. The resistance of a conductor ________ and a semiconductor _________ on heating.




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Correct Ans:Increases, decreases
Explanation:
When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra hindrance or resistance in the path of free electron. Hence resistance increases in investing the temperature whereas the resistance of a semiconductor decreases with increase in temperature and vice versa.

Hence, option A is correct.
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3. What happens to your weight when you are in a lift which goes down?




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Correct Ans:Decreases
Explanation:
The weight decreases when the lift moves down and it increases when the lift moves up.

As the lift moves down, we observe a pseudo force which acts on the opposite direction of the weight of the body. Hence, the net weight decreases.

As the lift moved up, we observe a pseudo force which acts on same direction as that of the weight of the body. Hence, the net weight increases.

Hence, option A is correct.
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4.
The slope of a velocity-time graph represents?




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Correct Ans:Acceleration
Explanation:
We know v = u+ at. If a graph of velocity “v” and time “t” is drawn, we get a straight line with slope “a” and an intercept “u”.

Hence, option B is correct.
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5. Higgs boson is also known as




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Correct Ans:Man particle
Explanation:
Higgs boson particle is also known as the god particle.

The Higgs boson is an elementary particle in the standard model of particle physics. First suspected to exist in the 1960s, it is the quantum excitation of the Higgs field, a fundamental field of crucial importance to particle physics theory. Unlike other known fields such as the electromagnetic field, it is scalar and also has a non-zero constant value in vacuum.

Hence, option B is correct.
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6. Curie is a unit of?




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Correct Ans:Radioactivity
Explanation:
Curie is a unit of radioactivity. The curie is a unit of ionizing radiation (radioactivity), symbolized Ci and equal to 3.7 x 1010 disintegrations or nuclear transformations per second. This is approximately the amount of radioactivity emitted by one gram (1 g) of radium-226. The unit is named after Pierre Curie, a French physicist.

Hence, option D is correct.
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7. What happens to the potential energy of an object when it is raised above the ground?




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Correct Ans:Increases
Explanation:
The potential energy of an object is = mgh, where m is the mass of the object, g is the acceleration of gravity and h is the height of the object. If the height is raised above the ground, the potential energy increases as energy is directly proportional to the height.

Hence, option B is correct
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8. Which of the following force holds protons and neutrons inside the nucleus of an atom?




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Correct Ans:Strong nuclear force
Explanation:
The known forces of nature can be divided into four- gravity, electromagnetism, weak nuclear force and strong nuclear force. It is the strong nuclear force which holds protons and neutrons together inside an atom. Whereas weak nuclear force is responsible for the existence and structure of nuclei including radioactivity and nuclear fusion.

Hence, option C is correct.
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9. The force of attraction or repulsion between two point charges at rest is directly proportional to the product of magnitude of the charges and inversely proportional to the square of the distance between them. Which of the following law implies the statement presented here?    




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Correct Ans:Coulomb’s Law
Explanation:
Charge is the basic property associated with matter due to which it produces and experiences electrical and magnetic effects .Coulomb’s Law is an important concept in static electricity. According to it , the force of attraction or repulsion between two point charges at rest is directly proportional to the product of magnitude of the charges and inversely proportional to the square of the distance between them. Also this force acts on the line joining the two charges.

Hence, option D is correct.
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10. What is the range of wavelength of electromagnetic spectrum between which light lies?




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Correct Ans:3500 A° t° 7800 A°
Explanation:
Light is a form of energy which is propagated as electromagnetic waves. In the spectrum of electromagnetic waves it lies between ultra-violet and infra-red region and has wavelength between 3500 A° t° 7800 A°.

Hence, option C is correct.
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11. What is the S.I. unit of pressure?




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Correct Ans:Pascal
Explanation:
Pressure is defined as force acting on unit area of the surface.

Pressure (P) = Normal force on surface (F)/ Area of the surface (A)

Hence the S.I. unit of pressure is N/m2 also called Pascal.

Hence, option A is correct.
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12. What would happen to the weight of a body in a lift moving upward with uniform speed?




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Correct Ans:Apparent weight is equal to the true weight
Explanation:
Weight of a body depends on the force of gravity acting upon it. In a lift stationary or moving with uniform speed (not with acceleration) the apparent weight of body is equal to its true weight. Because here the weight will be calculated as.

m{g-(a)}, where m is the mass of body g is the acceleration produced due to force of gravity which is 9.8m/s2 and a would be the acceleration due to the movement of lift. With uniform speed movement, the acceleration due to lift would be 0 here.

Hence , option C is correct.
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13. Sound waves are produced by




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Correct Ans:Vibrating bodies
Explanation:
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
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14. When a particle moves along a straight path, then the particle has




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Correct Ans:tangential acceleration only
Explanation:
The acceleration of a particle at any instant moving along a circular path in a direction tangential to that instant, is known as tangential component of acceleration or tangential acceleration.
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15. Dispersion process forms spectrum due to white light falling on a prism. The light wave with shortest wavelength




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Correct Ans:Refracts the most
Explanation:
The light wave with shortest wavelength i.e. violet refracts the most.
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16. Splitting of heavy unstable nuclear atom of uranium releases ________.




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Correct Ans:Nuclear energy
Explanation:
The splitting of an uranium atom releases energy. This process is called "nuclear fission", since the centre of an atom is called its nucleus. When an uranium atom splits it gives off more neutrons, which can then split more atoms, and so the energy level rapidly multiplies.

Nuclear fission is the process of splitting apart nuclei (usually large nuclei). When large nuclei, such as uranium-235, fissions, energy is released.
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17. Characteristic/s of a good source of energy is/are ________.




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Correct Ans:All of the above
Explanation:
Characteristics of a good source of energy:
- It should be able to do large amount of work for each unit of mass or volume.
- It should be easily accessible.
- It should be easily transported.
- It should be economical.
- Less combustible
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18. Polar Satellite Revolves around the earth in polar orbit at a height of 800km (app.) Time periods of these satellites is ?




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Correct Ans:84 min
Explanation:
Polar Satellite Revolves around the earth in polar orbit at a height of 800km (app.) Time periods of these satellites is 84 min.
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19. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments ________.




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Correct Ans:is zero
Explanation:
The momentum of bomb fragments comes from the potential energy stored inside the bomb, that is transformed into kinetic energy when the bomb explodes. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments is zero.
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20. The function of ball bearing in a wheel is ________.




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Correct Ans:to convert kinetic friction into rolling friction
Explanation:
Ball bearing in a wheel converts kinetic friction into the rolling friction which being very small, causes much less energy loss.
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