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Physics 914 MCQs [All-Courses]

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Physics is a core science subject that deals with the study of matter, energy, motion, force, heat, light, electricity, magnetism, and modern physics concepts. It plays a vital role in competitive exams such as PPSC, FPSC, NTS, OTS, KPPSC, BPSC, AJKPSC, CSS, and PMS, where questions test conceptual understanding, numerical problem-solving, and application of laws and formulas. 

All Topics  914

A photon of wavelength 900nm behaves like a particle of mass______________?
A 5.53 x 10-36kg
B 0 kg.
C 2.46 x 10-36kg
D 1.84 x 10-44kg
Correct Answer: 2.46 x 10-36kg
The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?
A 30°
B 45°
C 60°
D 180°
Correct Answer: 45°
An angle between two vectors A and B can be determined by_____________?
A Their dot product
B Their cross product
C Head to tail rule
D Right-hand rule
Correct Answer: Their dot product
If a photon is reflected from the mirror then the change in momentum of each photon is_______________?
A Zero
B Double
C Half
D 1
Correct Answer: Double
Which one is a unit vector ?
A ??3 i^ + ??3 j^ + ??3 k^
B 1/??3 i^ + 1/??3 j^ +1/ ??3 k^
C ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
D Both B and C are correct
Correct Answer: Both B and C are correct
If the wavelength of incident radiation is increased in photoemission then_________________?
A The maximum kinetic energy of the photoelectrons increases
B The minimum kinetic energy of the photoelectrons decreases
C The minimum kinetic energy of the photoelectrons increases
D The average kinetic energy of the photoelectrons decreases
Correct Answer: The average kinetic energy of the photoelectrons decreases
Null vector is a vector which has________________?
A Zero magnitude
B No specified direction
C Both A and B are correct
D Both A and B are not correct
Correct Answer: Both A and B are correct
In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?
A Becomes double
B Remains same
C Becomes half
D First increases then decrease because of the curvilinear graph
Correct Answer: Remains same
If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
A West
B North
C Down
D Up
Correct Answer: Down
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?
A Increases because wavelength decreases
B Decreases because speed decreases
C Remains same
D Increases then decrease
Correct Answer: Remains same
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