Beta rays consist of: MCQ with Answer and Explanation

Beta rays consist of:
A. Helium nuclei
B. High-speed electrons
C. Electromagnetic waves
D. Neutrons
Answer: Option B
Solution (By JKSSB Mock Tests)
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
Which of the following physical quantities is completely conserved during an inelastic collision?
A. Mechanical energy
B. Velocity
C. Linear momentum
D. Kinetic energy

Correct Answer: Option C


Explanation:
The fundamental law of conservation of momentum dictates that in a closed system with no external net forces, total linear momentum is always conserved regardless of the collision type. In an inelastic collision, some kinetic energy is converted into other forms of energy (like heat or sound or deformation work), meaning kinetic and total mechanical energy are explicitly NOT conserved.

This question belongs to: Science Physics
Question #2
The least count of a standard vernier calliper is generally
A. 0.1 cm
B. 0.01 cm
C. 1 cm
D. 0.001 cm

Correct Answer: Option B


Explanation:
Least count = 1 MSD - 1 VSD = 0.1 - 0.09 = 0.01 cm (common).

This question belongs to: Science Physics
Question #3
Frequency of sound wave determines:
A. Pitch
B. Speed
C. Timbre
D. Loudness

Correct Answer: Option A


Explanation:
Frequency → pitch perception: higher frequency = higher pitch. Loudness depends on amplitude; timbre on waveform; speed on medium properties. Memory aid: 'Frequency = pitch; Amplitude = loudness'. Basic sound property question frequently tested to verify perceptual attribute associations in competitive exams.

This question belongs to: Science Physics