Beta rays consist of: MCQ with Answer and Explanation

Beta rays consist of:
A. Electromagnetic waves
B. High-speed electrons
C. Helium nuclei
D. Neutrons
Answer: Option B
Solution (By JKExamLibrary)
Beta (β) rays are streams of high-speed electrons (β⁻) or positrons (β⁺) emitted during radioactive decay. Beta-minus decay: neutron → proton + electron + antineutrino. Alpha rays are helium nuclei (²He⁴); gamma rays are high-energy photons; neutrons are neutral particles. Memory tip: 'Beta = electrons; Alpha = He nucleus; Gamma = photons'. This classification question tests knowledge of radioactivity types, crucial for modern physics in competitive exams. Always distinguish penetration power: alpha < beta < gamma.

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Practice More Physics Questions

Question #1
A particle moves such that its position coordinates (x, y) are given by x = 2t and y = t^2. The equation of its trajectory is:
A. y = x
B. y = x^2 / 2
C. y = 2x^2
D. y = x^2 / 4

Correct Answer: Option D


Explanation:
The equation of trajectory represents the path of the particle in the x-y plane, eliminating the time variable 't'. Given x = 2t, we can write t = x/2. Substitute this into the y equation: y = t^2 = (x/2)^2 = x^2 / 4. This confirms the particle moves in a parabolic path.

This question belongs to: Science Physics
Question #2
The function of a fuse in a domestic circuit is to
A. Reduce current
B. Increase power factor
C. Protect against short circuit and overload
D. Regulate voltage

Correct Answer: Option C


Explanation:
Fuse is a safety device: thin wire melts when current exceeds safe limit due to short circuit or overload, breaking circuit. Prevents fire and appliance damage. Based on heating effect. MCB is modern alternative.

This question belongs to: Science Physics
Question #3
Identify the incorrect statement regarding the human eye.
A. The image formed on the retina is virtual and erect.
B. The cornea provides most of the eye's refractive power.
C. The retina acts as the screen where images are formed.
D. The pupil regulates the amount of light entering the eye.

Correct Answer: Option A


Explanation:
The eye lens is a convex (converging) lens. It converges light rays to form a real and inverted image on the retina. The brain processes this signal and flips it so we perceive the world as erect. All other statements are functionally correct. The cornea does indeed do about two-thirds of the focusing.

This question belongs to: Science Physics