A beam consisting of α-particles. β-particles and γ-rays pass through a magnetic field at right angles to the direction of the field. Which of the following observations would be made about the α-particles, β-particles, and γ-rays respectively?
A. Deflected, deflected, deflected B. Deflected, deflected, not deflected C. Deflected, not deflected, deflected D. Not deflected, deflected, deflected Correct Answer: Option B – Deflected, deflected, not deflected
A moving-coil galvanometer which gives a full-scale on deflection with 0.005A is converted to a voltmeter reading up to 5V using an external resistance of 975Ω. What is the resistance of the metre?
A. 0.25Ω B. 2.50Ω C. 25.00Ω D. 250.00Ω Correct Answer: Option C = 25.00Ω Explanation Using: E = I(R+r)
The length of an iron bar is 100cm at 20°C. At what temperature will its length increase by 0.01%? [Linear expansivity of iron = 1.2 x 10^−5°C]
A. 48.0°C B. 38.0°C C. 28.3°C D. 23.0°C Correct Answer: Option C = 28.3°C Explanation GIVEN DATA: where ΔL is the increase in length = 0.01 L1 is the initial length = 100 T1 = 20 T2 = ? α is the linear expansivity of iron = 1.2 x 10−5−5°C Formula ΔL = L1αΔT ΔT...
A 60kg man stands on a weighing balance in an elevator. If the elevator accelerates upwards at 5ms¯²; determine the reading of the scale. [g = 10ms¯²]
A. 300N B. 600N C. 800N D. 900N Correct Answer: Option D = 900N Explanation Formula R= Ma + Mg R=M(a+g) = 60(5+10) R = 900N
A ray of light travelling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30°. Calculate the angle of refraction. [Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]
A. 27° B. 33.5° C. 51.7° D. 72.8° Correct Answer: Option C = 51.7°Products
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