Physics MCQs
Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, NDA, CDS and all one day examinations of India.
11. The value of acceleration due to gravity is minimum on which of these planets?
[A] Mars
[B] Jupiter
[C] Mercury
[D] Neptune
Show Answer
Correct Answer: C [Mercury]
Notes:
The value of acceleration due to gravity is minimum on planet Mercury and maximum on planet Jupiter.
12. What happens to the orbital velocity of a satellite when the radius of orbit is increased?
[A] It decreases
[B] It increases
[C] It remains the same
[D] Not any of the above
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Correct Answer: A [It decreases]
Notes:
The orbital velocity of a satellite is directly impacted by changes to the radius of its orbit. If the radius of a satellite’s orbit is enlarged, the orbital velocity decreases. This is due to the fact that an increase in distance indicates less gravitational force, which in turn slows down the satellite’s speed.
13. What do we call the strain produced in a body when the deforming force produces a change in its shape without changing its volume?
[A] Linear Strain
[B] Volumetric Strain
[C] Shearing strain
[D] Thermal Strain
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Correct Answer: C [Shearing strain]
Notes:
When the deforming force produces a change in the shape of the body without changing its volume, the strain produced is called shearing strain.
14. What is the relationship between excess pressure and the radius of the bubble?
[A] are equal in value
[B] inversely proportional to each other
[C] directly proportional to each other
[D] no relationship
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Correct Answer: B [inversely proportional to each other]
Notes:
Excess pressure is inversely proportional to the radius of bubble (or drop). It means that the pressure inside a smaller bubble is higher than inside a larger bubble.
15. Which type of oscillation can be defined by a single harmonic function?
[A] Functional oscillation
[B] Regular oscillation
[C] Harmonic oscillation
[D] None of the above
Show Answer
Correct Answer: C [Harmonic oscillation]
Notes:
Harmonic oscillation is defined by a single harmonic function, often represented by either a sine or cosine function as y = a*sin(wt) or y = a*cos(wt). This phenomenon is frequently found in nature and physical systems, such as pendulum motion, spring motion, and even in atomic and subatomic particle behaviors.
16. Which of the following represents the speed of a sound wave?
[A] wavelength x frequency
[B] 2 x wavelength x frequency
[C] wavelength/frequency
[D] (wavelength x frequency)/2
Show Answer
Correct Answer: A [wavelength x frequency]
Notes:
The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time. It is represented by s = wavelength x frequency.
17. What is meant by Calorimetry?
[A] Measurement of heat
[B] Measurement of temperature
[C] Measurement of specific heat capacity
[D] None of the above
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Correct Answer: A [Measurement of heat]
Notes:
Calorimetry means measurement of heat. A device in which heat measurement can be done is called a calorimeter.
18. Which of the following is correct about Convection?
[A] It is possible in solids only
[B] It is possible in fluids only
[C] It is possible in solids and gases only
[D] None of the above
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Correct Answer: B [It is possible in fluids only]
Notes:
Convection is a mode of heat transfer by actual motion of matter. It is possible only in fluids.
19. Which of the following exchanges with the surrounding take place in a closed system?
[A] Both matter and energy
[B] Only energy
[C] Only matter
[D] No exchange
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Correct Answer: B [Only energy]
Notes:
In a closed system, only energy is exchanged with the surrounding.
20. Which of the following is a law of reflection?
[A] angle of incidence is equal to the angle of reflection
[B] angle of incidence is equal to twice the angle of reflection
[C] angle of incidence is equal to half of the angle of reflection
[D] angle of incidence is always complimentary to the angle of reflection
Show Answer
Correct Answer: A [angle of incidence is equal to the angle of reflection]
Notes:
As per one of the laws of reflection, the angle of incidence is always equal to the angle of reflection.
