# Physics Questions and Answers updated daily – General Knowledge

Physics: Solved 248 Physics Questions and answers section with explanation for various online exam preparation, various interviews, Logical Reasoning Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Physics Questions

1. What happens to the potential energy of an object when it is raised above the ground?

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

2. Which of the following force holds protons and neutrons inside the nucleus of an atom?

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.

3. 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?

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.

4. What is the range of wavelength of electromagnetic spectrum between which light lies?

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.

5. What is the S.I. unit of pressure?

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.

6. What would happen to the weight of a body in a lift moving upward with uniform speed?

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.

7. Sound waves are produced by

Correct Ans:Vibrating bodies
Explanation:
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.

8. When a particle moves along a straight path, then the particle has

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.

9. Dispersion process forms spectrum due to white light falling on a prism. The light wave with shortest wavelength

Correct Ans:Refracts the most
Explanation:
The light wave with shortest wavelength i.e. violet refracts the most.

10. Splitting of heavy unstable nuclear atom of uranium releases ________.

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.

11. Characteristic/s of a good source of energy is/are ________.

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

12. Polar Satellite Revolves around the earth in polar orbit at a height of 800km (app.) Time periods of these satellites is ?

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.

13. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments ________.

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.

14. The function of ball bearing in a wheel is ________.

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.

15. A crate of bananas weighing 3000 N is shipped from Ramgarh to Delhi, where it is unloaded by a dock worker who lifts the crate by pulling with a force of 200 N on the rope of a pulley. What is the actual mechanical advantage of the system?

Correct Ans:15N
Explanation:
-----> Mechanical advantage of a pulley = (output/force input)
-----> Force output is 3000N
-----> Force input is 200 N
-----> M.A = (3000/200)
-----> = 15N

16. Who among the following is the quantity__________________.

Correct Ans:pressure
Explanation:
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.

17. What is the mechanical advantage of a simple machine when a load of 450N can be lifted by force of 50N using a lever?

Correct Ans:9
Explanation:
---> Mechanical advantage of a lever is
---> M.A of a lever = (load/effort)
---> = (450/50) = 9

18. Troposphere is______

Correct Ans:Lowest level of atmosphere where we survive
Explanation:
Earth's atmosphere can be (called atmospheric stratification) into
five main layers. Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere. From highest to lowest, the five main layers are: Exosphere: 700 to 10,000 km (440 to 6,200 miles) Thermosphere: 80 to 700 km (50 to 440 miles) Mesosphere: 50 to 80 km (31 to 50 miles) Stratosphere: 12 to 50 km (7 to 31 miles) Troposphere: 0 to 12 km (0 to 7 miles) The troposphere is the lowest major atmospheric layer, extending from the Earth's surface up to the bottom of the stratosphere. The troposphere is where all of Earth's weather occurs. It contains approximately 80% of the total mass of the atmosphere.

19. A photostat machine works on

Correct Ans:magnetic image making
Explanation:
All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.

20. In the process of magnetization of a bar

Correct Ans:the entire bulk of the bar gets magnetised
Explanation:
In the process of magnetization of a bar the entire bulk of the bar gets magnetized.

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