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Physics 914 MCQs [All-Courses]

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.

Due to the relative motion of observer and frame of reference time:

A Dilates

B Contracts

C Constant

D Uniform

Review Detailed Answer

Correct Answer: Dilates

Electron cannot exist in the nucleus it is confirmed by observing that______________?

A It does emit radiation

B Its size as compare to proton and neutron is very small

C No antiparticle of electron is present

D The velocity of electron must be very high according to uncertainty principle

Review Detailed Answer

Correct Answer: The velocity of electron must be very high according to uncertainty principle

The mass of an object will get doubled at the speed of __________?

A 2.6×10⁴ m/s

B 2.6×10⁶ m/s

C 2.6×10² m/s

D 2.6×10 m/s

Review Detailed Answer

Correct Answer: 2.6×10⁶ m/s

Wave-like characteristic of electron is demonstrated by______________?

A Line spectrum of atoms

B Production of x-rays.

C Diffraction by crystalline solids

D Photoelectric effect

Review Detailed Answer

Correct Answer: Diffraction by crystalline solids

Mass-Energy relation given by Einstein in represented as: ____________?

A E=mc²

B E=hf

C E=m²c

D E=mv²

Review Detailed Answer

Correct Answer: E=mc²

UV radiation can be produced by______________?

A Heating the filament

B Electron excitation in the gas

C Ionization of atoms

D All the above

Review Detailed Answer

Correct Answer: Electron excitation in the gas

A black body has the property to _____________ all the radiation entering it.

A Exude

B Reflect

C Absorb

D None of these

Review Detailed Answer

Correct Answer: Absorb

X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

A The ions in a crystal are well arranged

B The lines in a diffraction grating cannot reflect X-rays.

C The penetration power of X-rays is high in a diffraction grating

D The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

Review Detailed Answer

Correct Answer: The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

Modern system of navigation satellites called ___________?

A Inertia frames of reference

B Navstar

C Proton

D None of these

Review Detailed Answer

Correct Answer: Navstar

Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?

A Number of incident electron i.e. filament current

B The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated

C The soft target which can easily emit electrons

D All of above are correct

Review Detailed Answer

Correct Answer: The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated

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Physics 914 MCQs [All-Courses]

All Topics 914

All Topics 914

Due to the relative motion of observer and frame of reference time:

Electron cannot exist in the nucleus it is confirmed by observing that______________?

The mass of an object will get doubled at the speed of __________?

Wave-like characteristic of electron is demonstrated by______________?

Mass-Energy relation given by Einstein in represented as: ____________?

UV radiation can be produced by______________?

A black body has the property to _____________ all the radiation entering it.

X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

Modern system of navigation satellites called ___________?

Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?