All Free Physics MCQs with Answers

• A. It is equal to the weight of the man.
• B. It is greater than the force exerted by the floor on the man.
• C. It is less than the force exerted by the floor on the man.
• D. It is less than the weight of the man.

Explanation: As the lift is accelerating vertically downward so (g-a). The apparent weight of a man would become less than the actual weight.

• A. They act in opposite directions
• B. They both act at the same point
• C. They both act on the same body
• D. They both have the same magnitude

Explanation: Two equal and opposite parallel forces not acting along the same line form a couple.

• A. Suffers no phase change
• B. Undergoes a phase change of 180° ·
• C. Undergoes a phase change of 270° ·
• D. Undergoes of 90°

Explanation: When light waves hit the boundary of a denser medium, some of it is transmitted/refracted and some is reflected.

• A. Suffers no phase change
• B. Undergoes a phase change of 180°
• C. Undergoes a phase change of 270°
• D. Undergoes a phase change of 90°

Explanation: When light waves hit the boundary of a denser medium, some of it is transmitted/refracted and some is reflected.

• A. 10 cm
• B. 12 cm
• C. 14 cm
• D. 16 cm

Explanation: We know the formula 1/f = 1/v - 1/u, where f = focal length of lens, v = distance of image from lens & u = distance of object from lens…

• A. Lens of short focal length
• B. Lens of large focal length
• C. Light of short wavelength
• D. Light of large wavelength

Explanation: Resolution depends on the wavelength of the light source. The smaller the wavelength, the greater the resolution.

• A. Speed of light
• B. wavelength of light
• C. Refractive index of the medium
• D. intensity of light

Explanation: The critical angle is the angle of incidence, which corresponds to an angle of refraction of 90 degrees when light travels from a denser…

• A. 5x100
• B. 5x10m
• C. 500 nm
• D. 50mm

Explanation: This question deals with a Michaelson interferometer. The Michelson interferometer produces interference fringes by splitting a beam of…

• A. Real inverted , in front of the lens
• B. Virtual, erect, in front of the lens
• C. Real erect behind the lens
• D. Real inverted behind the lens

Explanation: When an object is placed between a convex lens and its focus, the image formed is virtual, erect, and located on the same side as the…

• A. Real, erect
• B. Real inverted
• C. Virtual inverted
• D. Virtual erect

Explanation: The objective lens produces a real, inverted image and the eyepiece acts as a simple magnifier and does not re-invert and produces a…

• A. Velocity
• B. Wavelength
• C. Frequency
• D. Amplitude

Explanation: The frequency of light does not change when light travels from one medium to another.

• A. n=c/v
• B. n=v/c
• C. n=vc
• D. n=v.c

Explanation: This formula represents the index of refraction (n) of a medium, where c is the speed of light in a vacuum, and v is the speed of light in…

• A. White
• B. Black
• C. Red
• D. Green

Explanation: Black: The central spot appears black when destructive interference occurs, causing the incident and reflected waves to cancel each other…

• A. An electromagnetic wave
• B. A stationary wave
• C. Transverse wave
• D. A longitudinal wave

Explanation: Transverse waves which include all electromagnetic waves such as light, radio waves, and x-rays can be polarized, hence the answer will be…

• A. αmin≥1.22λ/D
• B. αm.λ/D
• C. αmin 2.1 λ/D
• D. αmin ≤1.22λ/D

Explanation: αmin ≥ 1.22λ/D. This is the correct expression for resolving power, known as Rayleigh's criterion, which states that the minimum…

• A. Longer wavelength light
• B. Shorter wavelength light
• C. Wavelength has no effect
• D. It depends only on the design of the microscope not on light

Explanation: Shorter wavelength light improves resolution and provides clearer visibility through a microscope due to its ability to distinguish…

• A. Total internal reflection
• B. Continuous refraction
• C. Both A and B
• D. None of these

Explanation: The total confinement of light for propagation in the optical fiber is obtained through a combination of total internal reflection and…

• A. Yellow has less speed
• B. Red light refracts less due to its long wavelength
• C. Actors
• D. Beggars

Explanation: Red light has a longer wavelength compared to yellow light. Longer wavelengths tend to refract less when passing through mediums like the…

• A. Grating plate
• B. Prism
• C. Polaroid
• D. Michelson interferometer

Explanation: The Michelson interferometer is specifically designed for precise measurements of wavelength.

• A. Vertical plates
• B. Electron gun
• C. Horizontal plates
• D. Fluorescent screen

Explanation: The time base circuit in a CRO is connected to the horizontal plates. These plates control the horizontal deflection of the electron beam…